CN111729599B - Process for adding expanded graphite into core material on color steel insulation board production line - Google Patents
Process for adding expanded graphite into core material on color steel insulation board production line Download PDFInfo
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- CN111729599B CN111729599B CN202010633093.7A CN202010633093A CN111729599B CN 111729599 B CN111729599 B CN 111729599B CN 202010633093 A CN202010633093 A CN 202010633093A CN 111729599 B CN111729599 B CN 111729599B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/82—Combinations of dissimilar mixers
- B01F33/821—Combinations of dissimilar mixers with consecutive receptacles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/40—Mixing liquids with liquids; Emulsifying
- B01F23/41—Emulsifying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/40—Mixers using gas or liquid agitation, e.g. with air supply tubes
- B01F33/402—Mixers using gas or liquid agitation, e.g. with air supply tubes comprising supplementary stirring elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/81—Combinations of similar mixers, e.g. with rotary stirring devices in two or more receptacles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/81—Combinations of similar mixers, e.g. with rotary stirring devices in two or more receptacles
- B01F33/811—Combinations of similar mixers, e.g. with rotary stirring devices in two or more receptacles in two or more consecutive, i.e. successive, mixing receptacles or being consecutively arranged
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/22—Expanded, porous or hollow particles
- C08K7/24—Expanded, porous or hollow particles inorganic
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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
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
Abstract
A process for adding expanded graphite into a core material on a color steel insulation board production line comprises the steps of adopting a batching tank to carry out batching, conveying to a storage tank after stirring, and conveying to a POLY unit for storage after stirring; feeding isocyanate stored in an ISO unit into a first working tank, and feeding the isocyanate into a material distribution mixer through a metering pump after stirring; sending the polyol composition containing the expanded graphite stored in the POLY unit into a second working tank, stirring and then sending into a material distribution mixer; the polyol composition mixed with the expanded graphite and the isocyanate are produced by mixing the polyol composition and the isocyanate in a cloth mixer and then foaming the mixture. The production process suitable for adding the expanded graphite into the polyol raw material is established on production equipment of the polyurethane double-sided color steel insulation board continuous line double-track machine, the production equipment comprises a device for adding the expanded graphite, the graphite is added into the raw material through a material preparation unit and is stirred, and the graphite is uniformly mixed in the raw material through stirring of a constant temperature unit and mixing of a mixing unit, so that the product quality is ensured.
Description
Technical Field
The invention belongs to the field of color steel plate production, and particularly relates to a process for adding expanded graphite into a core material on a color steel insulation board production line.
Background
The color steel sandwich board is a common product in the current building materials, not only can be well flame-retardant and sound-proof, but also is environment-friendly and efficient. The color steel sandwich board is formed by pressing an upper metal panel, a lower metal panel and a middle polymer heat insulation inner core, has the characteristics of simple and convenient installation, light weight, environmental protection and high efficiency, and can stop the condensation of water vapor by filling a closed bubble molecular structure used by a system. The color steel sandwich plate not only has the performances of high mechanical strength and easy forming of steel materials, but also has good decoration and corrosion resistance of coating materials. The color steel sandwich board is a new material which is worried by the world at present. With the improvement of science and technology and the enhancement of environmental awareness and the improvement of the living standard of people, the color steel sandwich board movable house increasingly shows strong vitality and wide market prospect and is favored by buildings, household appliances, electromechanics, transportation, interior decoration, office appliances and other industries. When the expanded graphite meets fire, carbon formation can be formed and the expanded graphite is obviously expanded, so that the flame is prevented from being continuously contacted with foam, and the fireproof effect is achieved. The addition of the expanded graphite can obviously improve the fireproof performance, and the conductive performance of the expanded graphite can enable the double-sided color steel heat-insulating plate product to have the antistatic function, and meanwhile, the influence on other performances of the foam is less.
At present, the raw materials for the polyurethane color steel insulation board generally use two components: one component is isocyanate, and the other component is polyol composition prepared by mixing polyol, flame retardant, catalyst, foaming agent, foam stabilizer and the like.
Expanded graphite receives the favor of polyurethane panel trade as a neotype solid fire retardant, and expanded graphite can form the knot carbon and show the inflation when touchhing fire to block the continuation contact of flame and foam, play the effect of fire prevention.
At present, no process for adding graphite into the raw materials of the polyurethane color steel insulation board exists in the industry, so that the process for adding the expanded graphite into the core material on the color steel insulation board production line is designed to improve the product quality.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a process for adding expanded graphite into a core material on a color steel insulation board production line.
In order to achieve the above objects and other related objects, the present invention provides the following technical solutions: a process for adding expanded graphite into a core material on a color steel insulation board production line comprises equipment for adding and mixing the expanded graphite into the raw material, wherein the equipment comprises a batching unit, a constant temperature unit and a mixing unit which are sequentially connected; the mixing unit comprises a mixing tank for mixing the polyol composition, the feeding end of the mixing tank is connected with a feeding box for storing expanded graphite, and a first stirrer is arranged in the mixing tank; the constant temperature unit comprises a material storage tank, a second stirrer is arranged in the material storage tank, the feed end of the material storage tank is connected with the discharge end of the proportioning tank, a first heat exchanger is arranged between the discharge end of the proportioning tank and the feed end of the material storage tank, and the discharge end of the material storage tank is connected with a POLY unit for storing polyol composition containing expanded graphite; the mixing unit comprises a first working tank, a second working tank and a material distribution mixer, wherein a third stirrer is arranged in the first working tank, a fourth stirrer is arranged in the second working tank, the feeding end of the first working tank is connected with an ISO unit for storing isocyanate, the discharging end of the first working tank is connected with the material distribution mixer through a metering pump, the feeding end of the second working tank is connected with the POLY unit, and the discharging end of the second working tank is connected with the material distribution mixer through a metering pump;
the process comprises the steps of adding and mixing expanded graphite:
the first step is as follows: the material is prepared by adopting a material preparing tank of a material preparing unit; firstly, feeding a polyol composition material mixed by polyol, a catalyst, a foaming agent and a foam stabilizer into the batching tank through a metering pump, and after the feeding is finished, conveying the metered expanded graphite into the batching tank from a feeding box by adopting negative pressure;
the second step is that: the materials are fully stirred in the material mixing tank by the first stirrer and then are conveyed to the material storage tank, and the materials are fully stirred in the material storage tank by the second stirrer and then are conveyed to a POLY unit of the mixing unit for storage;
the third step: feeding isocyanate stored in an ISO unit into a first working tank, and feeding the isocyanate into a material distribution mixer through a metering pump after stirring in the first working tank; feeding the polyol composition containing the expanded graphite stored in the POLY unit into a second working tank, stirring by a fourth stirrer, and feeding into the material distribution mixer;
the fourth step: the polyol composition mixed with the expanded graphite and the cyanate are produced by mixing through a medium-pressure cloth mixer and then foaming.
The preferable technical scheme is as follows: and in the third step, filtered gas is introduced into the second working tank to increase the emulsification of the materials when the fourth stirrer stirs.
The preferable technical scheme is as follows: and a spiral stirring rod with a shearing function is arranged in the cloth mixer, in the fourth step, the stirring rod is driven by a motor, the mixing and stirring speed is regulated in a grading manner, and the rotating speed is set at 3000-6000 r/min.
The preferable technical scheme is as follows: and in the fourth step, introducing a trace amount of air into the feed end of the material distribution mixer.
The preferable technical scheme is as follows: selecting expanded graphite with the mesh number of 80-100.
The preferable technical scheme is as follows: and selecting deacidified expanded graphite.
The preferable technical scheme is as follows: and a second heat exchanger is arranged between the first working tank and the material distribution mixer, and a third heat exchanger is arranged between the second working tank and the material distribution mixer.
Due to the application of the technical scheme, compared with the prior art, the invention has the advantages that:
according to the production process, a set of production process suitable for adding expanded graphite into a polyol raw material is established on production equipment of a polyurethane double-sided color steel insulation board continuous line double-track machine, the process comprises a device for adding expanded graphite, graphite is added into a raw material through a batching unit and is stirred, and then the graphite is uniformly mixed in the raw material through stirring of a constant temperature unit and mixing of a mixing unit, so that the product quality is guaranteed; the emulsification of the materials is increased through the air-entrapping device, the curing speed of the materials is increased, the foam foaming is promoted, and the efficiency is ensured; the addition of the expanded graphite can obviously improve the fireproof performance, and the conductive performance of the expanded graphite can enable the double-sided color steel heat-insulating plate product to have the antistatic function, and meanwhile, the influence on other performances of the foam is less.
Drawings
FIG. 1 is a schematic view of an apparatus for adding and mixing expanded graphite.
Fig. 2 is a schematic diagram of a structure of a mixing unit.
Fig. 3 is a schematic diagram of a cloth mixer.
In the above drawings, a batching tank 1, a feeding box 2, a first stirrer 3, a material storage tank 4, a second stirrer 5, a first heat exchanger 6, a POLY unit 7, a first working tank 8, a second working tank 9, a material distribution mixer 10, a third stirrer 11, a fourth stirrer 12, an ISO unit 13, a metering pump 14, an air-entraining device 15, a second heat exchanger 16 and a third heat exchanger 17.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
Please refer to fig. 1 to fig. 3. It should be understood that in the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship which the product of the present invention is usually placed in when used, which is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. The terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should be further noted that, unless otherwise specifically stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, and a communication between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1 to 3, a process for adding expanded graphite into a core material on a production line of a color steel insulation board comprises equipment for adding and mixing expanded graphite into the raw material, wherein the equipment comprises a batching unit, a constant temperature unit and a mixing unit which are sequentially connected; the batching unit comprises a batching tank 1 for batching the polyol composition, the feeding end of the batching tank 1 is connected with a feeding box 2 for storing expanded graphite, and a first stirrer 3 is arranged in the batching tank 1; the constant temperature unit comprises a material storage tank 4, a second stirrer 5 is arranged in the material storage tank 4, the feeding end of the material storage tank 4 is connected with the discharging end of the proportioning tank 1, a first heat exchanger 6 is arranged between the discharging end of the proportioning tank 1 and the feeding end of the material storage tank 4, and the discharging end of the material storage tank 4 is connected with a POLY unit 7 for storing polyol composition containing expanded graphite; the mixing unit comprises a first working tank 8, a second working tank 9 and a material distribution mixer 10, a third stirrer 11 is arranged in the first working tank 8, a fourth stirrer 12 is arranged in the second working tank 9, the feeding end of the first working tank 8 is connected with an ISO unit 13 for storing isocyanate, the discharging end of the first working tank 8 is connected with the material distribution mixer 10 through a metering pump 14, the feeding end of the second working tank 9 is connected with a POLY unit 7, and the discharging end of the second working tank 9 is connected with the material distribution mixer 10 through a metering pump 14; a second heat exchanger 16 is arranged between the first working tank 8 and the material distribution mixer 10, and a third heat exchanger 17 is arranged between the second working tank 9 and the material distribution mixer 10.
The process comprises the steps of adding and mixing expanded graphite:
the first step is as follows: the material is prepared by adopting a material preparing tank 1 of a material preparing unit; firstly, a polyol composition material mixed by polyol, a catalyst, a foaming agent and a foam stabilizer is fed into a batching tank 1 through a metering pump 14, and after the feeding is finished, the metered expanded graphite is conveyed into the batching tank 1 from a feeding box 2 by adopting negative pressure; the expanded graphite is deacidified with the selected mesh number of 80-100.
The second step is that: the materials are fully stirred in the proportioning tank 1 by the first stirrer 3 and then are conveyed to the material storage tank 4, and the materials are fully stirred in the material storage tank 4 by the second stirrer 5 and then are conveyed to a POLY unit 7 of the mixing unit for storage;
the third step: feeding isocyanate stored in an ISO unit 13 into a first working tank 8, and feeding the isocyanate into a material distribution mixer 10 through a metering pump 14 after stirring in the first working tank 8; feeding the polyol composition containing expanded graphite stored in the POLY unit 7 into the second work tank 9, stirring by the fourth stirrer 12, and feeding into the distribution mixer 10; the lower end of the second working tank 9 is connected with a filtering device and an air-adding device 15, and when the fourth stirrer 12 is used for stirring, filtered gas is introduced into the second working tank 9 to increase the emulsification of the materials.
The fourth step: the polyol composition mixed with the expanded graphite and the cyanate ester are mixed by a medium pressure type cloth mixer 10 and then foamed. A spiral stirring rod with a shearing function is arranged in the cloth mixer 10, the stirring rod is driven by a motor, the mixing and stirring speed is regulated in a grading mode, and the rotating speed is set to be 3000-6000 r/min. In the fourth step, a small amount of air is introduced into the feed end of the material-distributing mixer 10.
The preferred embodiment is: the metering pump 14 is a gear pump which respectively pressurizes the polyol composition mixed with the expanded graphite and the isocyanate into the distribution mixer 10, so that the time interval from the entry of the polyol composition mixed with the expanded graphite and the isocyanate into the distribution mixer 10 to the arrival of the mixed mixture at the exit of the distribution mixer 10 is less than 1 s. The polyol composition added with the expanded graphite and the composition in the material distribution mixer 10 have higher viscosity, and the smooth extrusion of the materials can be ensured by adopting the gear pump pressurization.
The invention establishes a set of production process suitable for adding expanded graphite into a polyol raw material on production equipment of a polyurethane double-sided color steel insulation board continuous line double-track machine. Because the expanded graphene is granular, the viscosity of the expanded graphene added into the polyol composition is increased, medium-pressure foaming machine equipment needs to be adopted, and a set of production process conditions suitable for adding the expanded graphite into the polyurethane composition on a double-track continuous line needs to be established:
the production process of the double-track continuous line for adding the expanded graphite into the polyurethane polyol composite material is different from normal production in that a process of adding the expanded graphite is added, the expanded graphite is added into the polyurethane polyol composite material and a storage tank with a stirring function, and the expanded graphite is mixed at present and has the best effect. And then adding expanded graphite into the just-mixed polyurethane polyol composite material, and pumping the mixture into a working tank for calibration test before production.
When the material charging amount is calculated, the expanded graphite is not converted into the composite material added with the polyurethane polyol and is only filled in the composite material added with the polyurethane polyol.
The holding tank and the pipeline should be noted to lower the gas-holding part to the lowest point, the inlet pipeline diameter of the metering pump is slightly larger, and the outlet is slightly smaller.
The metering of the materials is completed by metering pumps for all components. The raw materials used were two components: isocyanate is used as one component, and polyol, expanded graphite, a catalyst, a foaming agent, a foam stabilizer and the like are mixed into a combined material which is used as the other component. Thus, not only the equipment is simplified, but also the metering precision is greatly improved.
The precisely metered raw material components are sent into a material distribution mixer for medium-pressure mixing, and the uniformly mixed materials are continuously discharged onto a lower steel plate.
The polyol composition mixed with the expanded graphite and the cyanate are produced by mixing and then foaming the mixture by a medium-pressure cloth mixer device. A helical stirring rod with high shearing force is adopted in the material distribution mixer. The stirring rod is driven by a motor, the rotating speed is usually 3000-6000 r/min, and the mixing and stirring speed can be regulated in a grading way. The residence time of the material in the cloth mixer is less than 1 s. In the production process of continuously producing the double-sided color steel insulation board added with the expanded graphite polyurethane core material, the medium-pressure metering mixing foaming equipment can adjust the stirring form, the flow rate, the nozzle size and the like of the cloth mixer as required, and the quality of the produced foam body is ensured from the mechanical angle. The generation of a fine hole type structure is facilitated by reducing the back pressure and increasing the diameter of an outlet; in the medium-pressure machine, a trace air input device is arranged at the feed end of a cloth mixer, and the medium-pressure machine has certain effects on forming air nuclei and generating a fine foam structure.
The mixed materials are conveyed to a material distribution mixer under certain pressure, and the materials are prevented from splashing so as to avoid the materials carrying a large amount of air and causing large caves in the foam body. Therefore, a specially designed baffle, a trumpet-shaped or duckbilled flow guide pipe, a metal mesh and the like are arranged at the front part of the discharge port of the material distribution mixer, so that the diameter of the material is gradually enlarged, the impact energy in the flow channel is reduced, and meanwhile, the distance between the discharge port of the material and the steel plate is controlled to be 1 +/-0.2 cm, so that the material is prevented from splashing and the product quality is prevented from being influenced. In order to make the mixed materials flow uniformly on the lower steel plate, the material distribution mixer moves left and right in coordination with the moving speed of the lower steel plate, so that the materials enter into the distribution and flow out in a way of being transversely arranged with the moving direction of the lower steel plate, and the materials can be extremely uniformly distributed on the lower steel plate.
The expanded graphite is added into the polyurethane polyol composite material, and the difference between the production process of the double-track continuous line and the normal pure polyurethane production process is that the step of adding graphite is added, and the expanded graphite is completely added into the polyurethane polyol composite material in the past production experience. The free bubble draw, touch and cure times were adjusted. Meanwhile, the process and the raw materials need to meet the following conditions:
1. a set of medium pressure mixing and distributing device is adopted for distributing the materials evenly, as shown in figure 1.
2. Due to the fact that duckbill type fixed point cloth is adopted when viscosity is large, the plate surface is flat.
4. The linear speed can refer to the conventional plate type speed, and does not need to be adjusted greatly.
5. The polyurethane double-sided color steel heat-insulation plate is produced in a continuous line, and the temperature of a chain plate is greater than 50 degrees at the B3 level and greater than 55 degrees at the B2 level during production of a double-track machine.
6. The linear speed can refer to the plate type speed of the double-sided color steel heat-insulation plate for continuously producing the polyurethane core material without large adjustment.
7. The mesh number of the expanded graphite is selected between 80-100, the viscosity of the mixed expanded graphite is greatly increased after the mesh number is too large, and the graphite is easy to precipitate and delaminate when the mesh number is too low.
8. The deacidified expanded graphite is selected, and the graphite which is not deacidified is added into the polyurethane polyol composite material, so that the reaction time is quickly slowed down after the polyurethane polyol composite material is placed for half a day.
9. The material distribution mode preferably adopts fixed point material distribution, and due to large viscosity, if the material distribution is not uniform, the board surface is not flat.
10. The size of the material distributing head of the material distributing mixer is determined according to the production plate type and the flow rate.
11. The metering pump basically selects a wear-resistant gear pump in consideration of the viscosity change of the material after the addition of the expanded graphite.
12. The medium-pressure mixed foaming feeding amount can be set according to the production plate type and the flow rate.
The effect of graphite addition on oxygen index, density and draw time is shown in the following table: (white means polyol composition)
| Addition amount of graphite | Oxygen index | Influence of Density | Influence of drawing time | |
| B3-grade |
5% | 24±0.5 | Less than 1 | Is not changed |
| B3-grade |
15% | 26±0.5 | Less than 1 | Less than 2 seconds |
| B3-grade white material foundation | 25% | 29±0.5 | Less than 2 | Less than 3 seconds |
| B2-grade |
5% | 27-28 | Less than 1 | Is not changed |
| B2-grade |
15% | 28-29 | Less than 1 | Less than 2 seconds |
| B2-grade white material foundation | 25% | 30-31 | Less than 2 | Less than 3 seconds |
Table 1: the performance change of the B2-B3 polyether polyol composition material added with graphite in different proportions
Take B3 grade 5 cm white material as an example; conventional low-pressure mixed discharge parameters; inspiring that graphite is added for 10 seconds/wire drawing 45 seconds/density 34/white material, inspiring that graphite is added for 10-11 seconds/wire drawing 47 seconds/density is 35-36/temperature of a crawler is above 45 degrees/material temperature is about 24 degrees/black: the white material ratio is 1: 1.3 the line speed is about 4.8 m/min.
According to the production process, a set of production process suitable for adding expanded graphite into a polyol raw material is established on production equipment of a polyurethane double-sided color steel insulation board continuous line double-track machine, the process comprises a device for adding expanded graphite, graphite is added into a raw material through a batching unit and is stirred, and then the graphite is uniformly mixed in the raw material through stirring of a constant temperature unit and mixing of a mixing unit, so that the product quality is guaranteed; the emulsification of the materials is increased through the air-entrapping device, the curing speed of the materials is increased, the foam foaming is promoted, and the efficiency is ensured; the addition of the expanded graphite can obviously improve the fireproof performance, and the conductive performance of the expanded graphite can enable the double-sided color steel heat-insulating plate product to have the antistatic function, and meanwhile, the influence on other performances of the foam is less.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (6)
1. A process for adding expanded graphite into a core material on a color steel insulation board production line is characterized by comprising the following steps: the process comprises equipment for adding and mixing expanded graphite in raw materials, wherein the equipment comprises a batching unit, a constant temperature unit and a mixing unit which are sequentially connected; the mixing unit comprises a mixing tank for mixing the polyol composition, the feeding end of the mixing tank is connected with a feeding box for storing expanded graphite, and a first stirrer is arranged in the mixing tank; the constant temperature unit comprises a material storage tank, a second stirrer is arranged in the material storage tank, the feed end of the material storage tank is connected with the discharge end of the proportioning tank, a first heat exchanger is arranged between the discharge end of the proportioning tank and the feed end of the material storage tank, and the discharge end of the material storage tank is connected with a POLY unit for storing polyol composition containing expanded graphite; the mixing unit comprises a first working tank, a second working tank and a material distribution mixer, wherein a third stirrer is arranged in the first working tank, a fourth stirrer is arranged in the second working tank, the feeding end of the first working tank is connected with an ISO unit for storing isocyanate, the discharging end of the first working tank is connected with the material distribution mixer through a metering pump, the feeding end of the second working tank is connected with the POLY unit, and the discharging end of the second working tank is connected with the material distribution mixer through a metering pump;
the process comprises the steps of adding and mixing expanded graphite:
the first step is as follows: the material is prepared by adopting a material preparing tank of a material preparing unit; firstly, feeding a polyol composition material mixed by polyol, a catalyst, a foaming agent and a foam stabilizer into the batching tank through a metering pump, and after the feeding is finished, conveying the metered expanded graphite into the batching tank from a feeding box by adopting negative pressure;
the second step is that: the materials are fully stirred in the material mixing tank by the first stirrer and then are conveyed to the material storage tank, and the materials are fully stirred in the material storage tank by the second stirrer and then are conveyed to a POLY unit of the mixing unit for storage;
the third step: feeding isocyanate stored in an ISO unit into a first working tank, and feeding the isocyanate into a material distribution mixer through a metering pump after stirring in the first working tank; feeding the polyol composition containing the expanded graphite stored in the POLY unit into a second working tank, stirring by a fourth stirrer, and feeding into the material distribution mixer;
the fourth step: the polyol composition mixed with the expanded graphite and the isocyanate are produced by foaming after being mixed by a medium-pressure cloth mixer;
a discharge port of the distribution mixer is provided with a flow guide pipe and a metal net, a movable steel plate is arranged below the distribution mixer, and the distance between the discharge port and the steel plate is 0.8-1.2 cm; the material distribution mixer moves left and right in coordination with the moving speed of the steel plate;
connecting a filtering device and a gas filling device at the lower end of the second working tank, and introducing filtered gas into the second working tank to increase the emulsification of the materials during stirring by a fourth stirrer in the third step;
the shape of the draft tube is horn shape or duckbill shape.
2. The process for adding the expanded graphite into the core material on the production line of the color steel insulation board according to claim 1, which is characterized in that: and a spiral stirring rod with a shearing function is arranged in the cloth mixer, in the fourth step, the stirring rod is driven by a motor, the mixing and stirring speed is regulated in a grading manner, and the rotating speed is set at 3000-6000 r/min.
3. The process for adding the expanded graphite into the core material on the production line of the color steel insulation board according to claim 2, which is characterized in that: and in the fourth step, introducing a trace amount of air into the feed end of the material distribution mixer.
4. The process for adding the expanded graphite into the core material on the production line of the color steel insulation board according to claim 3, which is characterized in that: selecting expanded graphite with the mesh number of 80-100.
5. The process for adding the expanded graphite into the core material on the production line of the color steel insulation board according to claim 4, wherein the process comprises the following steps: and selecting deacidified expanded graphite.
6. The process for adding the expanded graphite into the core material on the production line of the color steel insulation board according to claim 5, which is characterized in that: and a second heat exchanger is arranged between the first working tank and the material distribution mixer, and a third heat exchanger is arranged between the second working tank and the material distribution mixer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010633093.7A CN111729599B (en) | 2020-07-04 | 2020-07-04 | Process for adding expanded graphite into core material on color steel insulation board production line |
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| CN202010633093.7A CN111729599B (en) | 2020-07-04 | 2020-07-04 | Process for adding expanded graphite into core material on color steel insulation board production line |
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| CN111729599A CN111729599A (en) | 2020-10-02 |
| CN111729599B true CN111729599B (en) | 2022-04-22 |
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