CN211847772U - Photo-thermal polymerization reaction device - Google Patents
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- CN211847772U CN211847772U CN202020405771.XU CN202020405771U CN211847772U CN 211847772 U CN211847772 U CN 211847772U CN 202020405771 U CN202020405771 U CN 202020405771U CN 211847772 U CN211847772 U CN 211847772U
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Abstract
The utility model discloses a photo-thermal polymerization reaction device, which comprises a screw extrusion device; a light transmission area is arranged near a feed inlet of the screw extrusion equipment and used for irradiating a light source into the screw extrusion equipment through the light transmission area, and a devolatilization port is arranged near a discharge outlet of the screw extrusion equipment. The utility model discloses a light and heat polymerization device is applicable to vinyl monomer light and heat polymerization's macro and continuous production, and monomer content and volatile organic compound content are low in the polymerizate.
Description
Technical Field
The utility model relates to a light and heat polymerization reaction device, in particular to light and heat polymerization reaction device suitable for vinyl monomer body polymerization.
Background
The free radical polymerization reaction of the vinyl monomer is a chain reaction, the heat release is large, the reaction speed is high, and the solution needs to be added to reduce the temperature and the viscosity of a polymerization reaction system, so that the reaction is more uniform, and the generation of gel is reduced. However, the use of a large amount of solvent is easy to cause resource waste and environmental pollution, and in addition, some special products (such as pressure-sensitive adhesive and the like) need to remove the solvent, thereby reducing the production efficiency. Therefore, the polymerization mode of the vinyl monomer needs to be changed from solvent polymerization to bulk polymerization.
CN104854140B discloses a method for polymerizing ethylenically unsaturated materials using ionizing radiation, placing a non-degassed mixture containing an ethylenically raw material in a batch reactor, exposing the non-degassed mixture containing an ethylenically raw material to a source of ionizing radiation, and polymerizing at least a portion of the mixture; polymerizing the olefinic bond-containing feedstock under substantially adiabatic conditions while continuing to expose the mixture to the source of ionizing radiation. CN1013311161A discloses a method for radical polymerization of vinyl monomers, comprising mixing a monomer mixture containing a radically copolymerizable vinyl monomer, at least one thermal radical initiator and optionally a scavenger monomer in a batch reactor, and heating to initiate polymerization. The method does not stir in the process of bulk polymerization, the reaction is not uniform, and more gel exists in the product.
CN110423304A discloses a preparation method of vinyl polymer by interstitial photo-thermal free radical polymerization. In a reaction vessel, a homogeneous mixture of at least two vinyl monomers, at least one photoinitiator and optionally at least one thermal initiator, the at least one photoinitiator being brought to initiation conditions by light irradiation to cause a polymerization reaction and obtain a mixture comprising at least a partial polymerization of the vinyl monomers, the reaction exotherm causing the temperature to rise and the thermal initiator also initiating the polymerization of the vinyl monomers. The method adopts a three-neck flask and mechanical stirring, the polymerization reaction needs cooling, and the heat of the polymerization reaction is not fully utilized. Even more disadvantageous to practical use is that the method requires the reaction to be terminated when the viscosity of the material increases to such an extent that stirring is difficult. For polymers with a high Tg or high molecular weight, the viscosity increase during the polymerization is rapid, the viscosity of the reaction mass is already very high at monomer conversions below 50%, and stirring cannot be continued due to the climbing effect. Therefore, it is required to control the monomer conversion rate of the reaction or to add a solvent to the reaction system, which results in a large amount of unreacted monomer and/or solvent remaining in the reaction product, and the process is not suitable for mass and continuous production.
CN208946649U discloses an extruder comprising: a first stage machine comprising a first power system and a first extrusion system connected to the first power system; the second-order machine comprises a second power system and a second extrusion system connected with the second power system; a devolatilization system; wherein the first extrusion system is in communication with the second extrusion system via a first connector; the devolatilization system is communicated with the second extrusion system through a second connecting piece; the vertical distance of the first connecting piece is not higher than that of the second connecting piece. The extruder cannot meet the application of photo-thermal polymerization.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention provides a photothermal polymerization reaction device, which is suitable for the macro production of the photothermal polymerization of vinyl monomers, and the polymerization product has low monomer content and low content of volatile organic compounds.
The utility model discloses a following technical scheme realizes above-mentioned technical purpose.
The utility model provides a photo-thermal polymerization reaction device, which comprises a screw extrusion device; wherein, near the feed inlet of screw extrusion equipment is provided with the printing opacity district for in passing through the printing opacity district irradiation entering screw extrusion equipment with the light source, near the discharge gate of screw extrusion equipment is provided with the devolatilization mouth.
According to the photothermal polymerization reaction apparatus of the present invention, preferably, the length-diameter ratio of the screw extrusion device is greater than 40; the light-transmitting area at least covers a part of a screw area of the screw extrusion equipment, and the coverage rate is 20-100%; wherein the coverage rate represents a ratio of a length of the light-transmitting zone in a screw axial direction of a screw extrusion device to a screw length of the screw extrusion device.
According to the utility model discloses a light and heat polymerization reaction unit, preferably, the screw extrusion equipment includes the screw extruder of at least one order.
According to the utility model discloses a light and heat polymerization reaction unit, preferably, the screw extrusion equipment includes first order screw extruder and second order screw extruder, and first order screw extruder and second order screw extruder establish ties and set up.
The photothermal polymerization reaction apparatus according to the present invention preferably further comprises a light reaction channel for the reaction raw material to undergo photothermal polymerization reaction to form a pre-reaction product; the photoreaction channel has an output end connected to the feed port and configured to convey the pre-reaction product to the screw extrusion device.
According to the utility model discloses a light and heat polymerization reaction unit, preferably, the photoreaction channel has at least one deck stratum lucidum, one side of the relative light source of photoreaction channel is provided with the reflector layer.
According to the utility model discloses a light and heat polymerization reaction unit, preferably, the photoreaction passageway has at least two-layer stratum lucidum, the reflector layer sets up between the stratum lucidum in the outside and the inboard stratum lucidum.
According to the utility model discloses a light and heat polymerization reaction unit, preferably, the photoreaction channel is provided with the air inlet that supplies inert gas to let in.
According to the photo-thermal polymerization reaction device of the present invention, preferably, the photo-thermal polymerization reaction device further comprises a material tank for containing reaction raw materials; the photoreaction channel also has an input end that is configured to be connectable to the material tank by a metering pump.
According to the utility model discloses a light and heat polymerization reaction device, preferably, light and heat polymerization reaction device is the light and heat polymerization reaction device of vinyl monomer body polymerization.
The utility model discloses carry out light and heat polymerization in screw rod extrusion equipment, material dwell time is short, has realized vinyl monomer's macro production and continuous body polymerization production. Under the kneading and extruding actions of the screw, the materials are fully mixed, the monomer conversion rate is high, the gel-like products in the reaction products are reduced, the products are not accumulated in the reaction flow channel, and a solvent is not required. Further, the device of the utility model is adopted, the content of volatile organic compounds in the polymerization product is less. According to the utility model discloses preferred embodiment, screw extrusion equipment is second order screw extruder group, can gain better polymerization effect like this and take off the effect.
Drawings
FIG. 1 shows a photo-thermal polymerization apparatus according to the present invention.
FIG. 2 shows another photothermal polymerization apparatus according to the present invention.
FIG. 3 shows another photothermal polymerization apparatus according to the present invention.
FIG. 4 shows another photothermal polymerization apparatus according to the present invention.
The reference numerals are explained below:
1-screw extrusion equipment; 2-a feed inlet; 3-discharging port; 4-a light-transmitting region; 5-a light source; 6-devolatilizing; 7-material tank; 8-a metering pump; 9-a photoreaction channel; 11-first stage screw extruder; 12-second stage screw extruder.
Detailed Description
The present invention will be further described with reference to the following specific examples, but the scope of the present invention is not limited thereto.
The photo-thermal polymerization reaction device is a device for carrying out polymerization reaction by utilizing light and heat. Specifically, it may be a photothermal polymerization reaction apparatus in which vinyl monomers are polymerized.
The utility model discloses a light and heat polymerization device includes screw extrusion equipment. The screw extrusion equipment can be first-order screw extrusion equipment and also can be multi-order screw extrusion equipment. By first order is meant that only one screw extrusion device is used. The so-called multistage expression has a plurality of screw extrusion apparatuses used in series. Each stage of the screw extrusion apparatus may be a single screw extruder or a twin screw extruder. The screw extrusion apparatus may further comprise heating means for maintaining the temperature of the polymerization reaction. The heating means is preferably a cast aluminium heater.
The screw extrusion device includes a barrel and a screw disposed within the barrel. The machine barrel is provided with a feed inlet and a discharge outlet. The screw extrusion apparatus may further comprise a transmission apparatus and a feeding apparatus. The feeding device is connected with the feeding hole, and the transmission device is used for driving the screw rod to rotate. The screw extrusion apparatus may also include a head for housing the various components.
The utility model discloses a near feed inlet of screw rod extrusion equipment is provided with the printing opacity district for shine the entering screw rod extrusion equipment in through the printing opacity district with the light source. A devolatilization port is arranged near the discharge port of the screw extrusion equipment. The photo-thermal polymerization reaction device of the utility model is particularly suitable for the photo-thermal polymerization reaction of vinyl monomers.
The light-transmitting area is arranged near the feed inlet of the screw extrusion equipment and at least covers a part of the screw area of the screw extrusion equipment. The reaction time ratio of the photoreaction to thermal reaction can be achieved by adjusting the coverage of the light-transmitting zone. The coverage rate can be 20-100% or 20-50%. The coverage rate represents the ratio of the length of the light-transmitting zone in the screw axial direction of the screw extrusion apparatus to the length of the screw extrusion apparatus. Therefore, the method is suitable for the polymerization reaction of materials with low light transparency, such as filler, pigment and the like contained in reaction materials, and the polymerization reaction effect is better. The light-transmitting zone can be an integral zone, or a plurality of zones can be distributed in the screw zone of the screw extrusion equipment. According to one embodiment of the present invention, an opening is provided in the screw zone near the feed port of the screw extrusion device, and a transparent material (e.g., an inorganic glass plate, a quartz glass plate) is coated on the opening to form a light-transmitting zone.
The utility model discloses a screw extrusion equipment includes at least one-order screw extruder. Preferably, the screw extruder is a double-stage screw extruder set. This further ensures the smooth progress of the polymerization reaction. The total time of the photothermal polymerization reaction can be adjusted by the length of the barrel and the screw, the longer the polymerization time of the material. Preferably, the length to diameter ratio of the screw is greater than 40. More preferably, the length-diameter ratio of the screw is 50 to 70. Therefore, the materials can be fully reacted, the equipment is easy to process, and the cost is not too high.
According to the utility model discloses an embodiment, the screw extrusion equipment is second order screw rod and extrudes the unit. The screw extrusion device comprises a first-stage screw extruder and a second-stage screw extruder, and the first-stage screw extruder and the second-stage screw extruder are arranged in series. The screws of the first stage screw extruder and the screws of the second stage screw extruder may be at any angle, and are preferably arranged perpendicular to each other. The first-order screw extruder and the second-order screw extruder are respectively provided with a feed inlet and a discharge outlet, the discharge outlet of the first-order screw extruder is connected with the feed inlet of the second-order screw extruder, the feed inlet of the first-order screw extruder is used as the feed inlet of the screw extrusion equipment, and the discharge outlet of the second-order screw extruder is used as the discharge outlet of the screw extrusion equipment. And a light transmission area is arranged near the feed inlet of the first-stage screw extruder and is used for irradiating a light source into the first-stage screw extruder through the light transmission area. A devolatilization port is arranged near the discharge port of the second-stage screw extruder. The second stage screw extruder is preferably a twin screw devolatilization extruder. The reaction raw materials enter the first-stage screw extruder from a feed inlet of the first-stage screw extruder, undergo photothermal polymerization in the first-stage screw extruder unit, then enter the second-stage screw extruder for continuous reaction, and are devolatilized through a devolatilization port of the second-stage screw extruder, and then are discharged from a discharge port of the second-stage screw extruder. This enables to obtain a better polymerization reaction effect and devolatilization effect.
The utility model discloses a take off and wave a mouthful setting and extrude near the discharge gate that is equipped with at the screw rod. The photo-thermal polymerization reaction device of the utility model also comprises a decompression devolatilization device which is arranged to be capable of being connected with the devolatilization port. The reduced pressure devolatilization equipment comprises a condenser and a vacuum pump. According to the utility model discloses a specific embodiment, take off and wave the mouth and link to each other with the condenser through the connecting pipe that is provided with the ball valve, the other end of condenser links to each other with the vacuum pump.
The photo-thermal polymerization reaction device of the utility model also comprises a photo-reaction channel for the reaction raw material to carry out photo-thermal polymerization reaction to form a pre-reaction product. The photoreaction channel has an output end connected to the feed port and configured to convey the pre-reaction product to the screw extrusion device. The reaction raw materials are subjected to photo-thermal polymerization reaction in the light reaction channel to obtain a pre-reaction product, and the pre-reaction product is input into the screw extrusion equipment through the feed inlet of the screw extrusion equipment to continue polymerization reaction.
The utility model discloses a photoreaction channel has at least one deck stratum lucidum, one side of the relative light source of photoreaction channel is provided with the reflector layer. In certain embodiments, the photoreaction channel is a transparent tube having at least one layer structure. In certain embodiments, the photoreaction channel is a transparent tube of at least two-layer structure.
The light reflecting layer is arranged on one side of the light reaction channel opposite to the light source. The reflecting layer can be a high-gloss metal plate or a high-gloss metal film, and the material of the reflecting layer can be aluminum or steel. In some embodiments, the light responsive channel has at least two transparent layers, and the light reflective layer is disposed between the outermost transparent layer and the inner transparent layer on a side of the light responsive channel opposite the light source.
The photoreaction channel is provided with an air inlet for introducing inert gas. And introducing inert gas into the photoreaction channel and the screw extrusion equipment from the gas inlet of the photoreaction channel, and exhausting air.
The photo-thermal polymerization reaction device of the utility model also comprises a material tank for containing reaction raw materials; the photoreaction channel also has an input end configured to be connectable to the material tank. The photo-thermal polymerization reaction device of the utility model also comprises a metering pump. The discharge port of the material tank is connected with the feed port of the metering pump, and the discharge port of the metering pump is connected with the input port of the photoreaction channel or the feed port of the screw extrusion equipment. Thus, the amount of the reaction raw material can be adjusted.
In certain embodiments, the photothermal polymerization reaction apparatus comprises a screw extrusion device comprising a twin screw extruder and a heating device for maintaining the temperature of the polymerization reaction. The screw extrusion equipment is provided with a feed inlet and a discharge outlet. An opening is provided in the screw region near the feed port of the screw extrusion apparatus, and a transparent material (e.g., an inorganic glass plate, a quartz glass plate) is coated on the opening to form a light-transmitting region. The light source irradiates into the screw extrusion equipment through the light-transmitting area to provide a light source for photo-thermal polymerization reaction. A devolatilization port is arranged near a discharge port of the screw extrusion equipment, the devolatilization port is connected with a condenser through a connecting pipe provided with a ball valve, and the other end of the condenser is connected with a vacuum pump.
In other embodiments, the photothermal polymerization reaction apparatus comprises a photoreaction channel and a screw extrusion device comprising a twin screw extruder and a heating device for maintaining the temperature of the polymerization reaction. The photoreaction channel is provided with an input port for allowing the reaction raw material to enter the photoreaction channel and an output port. The output port of the photoreaction channel is connected with the feed inlet of the screw extrusion equipment. The photoreaction channel is a hollow glass tube with two circular tubes at two ends and a flat middle part, and a reflecting layer is arranged on one side of the glass tube opposite to the light source. The light reaction channel is provided with an air inlet used for introducing inert gas into the light reaction channel. An opening is provided in the screw region near the feed port of the screw extrusion apparatus, and a transparent material (e.g., an inorganic glass plate, a quartz glass plate) is coated on the opening to form a light-transmitting region. The light source irradiates into the screw extrusion equipment through the light-transmitting area to provide a light source for photo-thermal polymerization reaction. A devolatilization port is arranged near a discharge port of the screw extrusion equipment, the devolatilization port is connected with a condenser through a connecting pipe provided with a ball valve, and the other end of the condenser is connected with a vacuum pump.
In still other embodiments, the photothermal polymerization apparatus comprises a screw extrusion device. The screw extrusion equipment comprises a second-order screw extrusion unit and a heating device. The second-order screw extruder set comprises a first-order screw extruder and a second-order screw extruder, the first-order screw extruder is a double-screw extruder set, the second-order screw extruder is a double-screw devolatilization extruder, and the first-order screw extruder and the second-order screw extruder are arranged in series. The first-stage screw extruder is provided with a feed inlet, a screw area near the feed inlet is provided with an opening, and the opening is covered with a glass plate to form a light transmission area. The light source irradiates into the screw extrusion equipment through the light-transmitting area to provide a light source for photo-thermal polymerization reaction. And a discharge port is formed in the second-stage screw extruder, a devolatilization port is formed near the discharge port, the devolatilization port is connected with a condenser through a connecting pipe provided with a ball valve, and the other end of the condenser is connected with a vacuum pump. Reaction raw materials enter the first-stage screw extruder from a feed inlet of the first-stage screw extruder, photo-thermal polymerization reaction occurs in the first-stage screw extruder, then the reaction raw materials enter the second-stage screw extruder for continuous reaction, and reaction products are devolatilized through a devolatilization port of the second-stage screw extruder and then are discharged from a discharge port of the second-stage screw extruder.
In still other embodiments, the photothermal polymerization reaction apparatus comprises a photoreaction channel and a screw extrusion device. The photoreaction channel is provided with an input port for allowing the reaction raw material to enter the photoreaction channel and an output port. The output port of the photoreaction channel is connected with the feed inlet of the screw extrusion equipment. The photoreaction channel is a hollow glass tube with two circular tubes at two ends and a flat middle part, and a reflecting layer is arranged on one side of the glass tube opposite to the light source. The light reaction channel is provided with an air inlet used for introducing inert gas into the light reaction channel. The screw extrusion equipment comprises a second-order screw extrusion unit and a heating device. The second-order screw extruder set is composed of a first-order screw extruder and a second-order screw extruder, the first-order screw extruder is a double-screw extruder, the second-order screw extruder is a double-screw devolatilization extruder, and the first-order screw extruder and the second-order screw extruder are arranged in series. The first-stage screw extruder is provided with a feed inlet, an opening is arranged in a screw area near the feed inlet, and a transparent object (such as an inorganic glass plate and a quartz glass plate) is covered on the opening to form a light transmission area. The light source irradiates into the screw extrusion equipment through the light-transmitting area to provide a light source for photo-thermal polymerization reaction. The second-stage screw extruder is provided with a discharge port, a devolatilization port is arranged near the discharge port, the devolatilization port is connected with a condenser through a connecting pipe provided with a ball valve, and the other end of the condenser is connected with a vacuum pump.
Example 1
The photothermal polymerization reaction apparatus of the present embodiment includes a screw extrusion device 1. The screw extrusion apparatus 1 comprises a twin-screw extruder and a heater (e.g., a cast aluminum heater). The heater is used to maintain the temperature of the polymerization reaction. The screw extrusion apparatus 1 is provided with a feed port 2 and a discharge port 3. An opening is provided in the screw region near the feed port 2 of the screw extrusion apparatus, and a quartz glass plate is covered on the opening to form a light-transmitting region 4. The light source 5 irradiates into the screw extrusion equipment through the light-transmitting area to provide a light source for photo-thermal polymerization reaction. A devolatilization port 6 is arranged near the discharge port 3 of the screw extrusion equipment, the devolatilization port 6 is connected with a condenser through a connecting pipe provided with a ball valve, and the other end of the condenser is connected with a vacuum pump. The length-diameter ratio of the screw extrusion device is 60. The coverage of the light-transmitting region was 30%. The coverage indicates the ratio of the length of the light-transmitting zone in the screw axis direction of the screw extrusion apparatus to the length of the screw extrusion apparatus.
When the reaction is started, the ball valve at the devolatilization port is closed, the discharge port 3 of the screw extrusion device is covered with a film, nitrogen is introduced from the feed port 2, gas is discharged from the film slit of the discharge port 3, and then the reaction raw material is added from the feed port 2 so that all the gas in the screw extrusion device 1 is discharged. Turning on a light source and a heater, removing a film in a discharge port 3 of the screw extrusion equipment, reacting for a period of time to obtain high-viscosity resin with residual monomer peculiar smell; at the moment, the vacuum pump is started, the ball valve is opened to remove residual monomers, the extruded resin is strip-shaped and high in viscosity, and peculiar smell is obviously reduced.
Example 2
The photothermal polymerization reaction device of this embodiment includes a material tank 7, a metering pump 8, a photoreaction channel 9, and a screw extrusion apparatus 1. The screw extrusion apparatus 1 includes a twin-screw extruder and a heater (e.g., a cast aluminum heater). The heater is used to maintain the temperature of the polymerization reaction.
The screw extrusion apparatus 1 is provided with a feed port 2 and a discharge port 3. The material tank 7 is used for containing reaction raw materials, a discharge hole of the material tank 7 is connected with a feed inlet of the metering pump 8, a discharge hole of the metering pump 8 is connected with an input port of the photoreaction channel 9, and an output port of the photoreaction channel 9 is connected with the feed inlet 2 of the screw extrusion equipment 1. The photoreaction channel 9 is a glass tube with two circular tubes at two ends and a flat and hollow middle. One side of the glass tube opposite to the light source is provided with a high-light metal aluminum plate as a reflecting layer. The photoreaction channel 9 is provided with an air inlet for introducing inert gas into the photoreaction channel 9.
An opening is provided in the screw region at the feed port 2 end of the screw extrusion apparatus, and a quartz glass plate is covered on the opening to form a light-transmitting region 4. The light source 5 irradiates into the screw extrusion equipment through the light-transmitting area to provide a light source for photo-thermal polymerization reaction. A devolatilization port 6 is arranged near the discharge port 3 of the screw extrusion equipment, the devolatilization port 6 is connected with a condenser through a connecting pipe provided with a ball valve, and the other end of the condenser is connected with a vacuum pump. The length-diameter ratio of the screw extrusion device is 60. The coverage of the light-transmitting region was 30%. The coverage indicates the ratio of the length of the light-transmitting zone in the screw axis direction of the screw extrusion apparatus to the length of the screw extrusion apparatus.
When the reaction was started, the ball valve at the devolatilization port 6 was closed, the discharge port 3 was covered with a film, nitrogen gas was introduced from the inlet port of the photoreaction channel 9, and the gas was discharged from the film slit of the discharge port 3 for 15 minutes. And starting the metering pump 8, adjusting the flow rate and discharging the gas in the reaction device. Turning on a light source and a heater, removing a film in a discharge port 3 of the screw extrusion equipment, reacting for a period of time to obtain high-viscosity resin with residual monomer peculiar smell; at the moment, the vacuum pump is started, the ball valve is opened to remove residual monomers, the extruded resin is strip-shaped and high in viscosity, and peculiar smell is obviously reduced.
Example 3
The photothermal polymerization apparatus of this example comprises a screw extrusion device. The screw extrusion apparatus includes a two-stage screw extruder block and a heater (e.g., a cast aluminum heater). The second-order screw extruder group consists of a first-order screw extruder 11 and a second-order screw extruder 12.
The first stage screw extruder 11 is a twin-screw extruder, and the second stage screw extruder 12 is a twin-screw devolatilizing extruder. The first-stage screw extruder 11 and the second-stage screw extruder 12 are arranged in series, and the screw of the first-stage screw extruder 11 and the screw of the second-stage screw extruder 12 are arranged perpendicular to each other. The first-stage screw extruder 11 is provided with a feed port 2, and an opening is provided in a screw region near the feed port 2, and a quartz glass plate is covered on the opening to form a light-transmitting region 4. The light source 5 irradiates into the screw extrusion equipment through the light-transmitting area to provide a light source for photo-thermal polymerization reaction. The second-stage screw extruder 12 is provided with a discharge port 3, a devolatilization port 6 is arranged near the discharge port 3, the devolatilization port 6 is connected with a condenser through a connecting pipe provided with a ball valve, and the other end of the condenser is connected with a vacuum pump. The length-to-diameter ratio of the screw of the first stage screw extruder 11 was 50. The coverage of the light-transmitting region was 85%. The coverage indicates the ratio of the length of the light-transmitting zone in the screw axial direction of the first-stage screw extruder 11 to the length of the screw of the first-stage screw extruder 11.
The reaction raw materials enter a first-stage screw extruder 11 from a feeding hole 2, undergo photothermal polymerization reaction in the first-stage screw extruder 11, then enter a second-stage screw extruder 12 for continuous reaction, and are devolatilized through a devolatilization port 6 of the second-stage screw extruder 12 and then discharged from a discharging hole 3.
Example 4
The photothermal polymerization reaction device of this embodiment includes a material tank 7, a metering pump 8, a photoreaction channel 9, and a screw extrusion apparatus 1. The screw extrusion apparatus 1 includes a second-order screw extruder block and a heater (e.g., a cast aluminum heater). The second-order screw extruder group consists of a first-order screw extruder 11 and a second-order screw extruder 12.
The first stage screw extruder 11 is a twin-screw extruder, and the second stage screw extruder 12 is a twin-screw devolatilizing extruder. The first stage screw extruder 11 is disposed in series with the second stage screw extruder 12. The first-stage screw extruder 11 is provided with a feed port 2, and an opening is provided in a screw region near the feed port 2, and a quartz glass plate is covered on the opening to form a light-transmitting region 4. The light source 5 irradiates into the screw extrusion equipment through the light-transmitting area to provide a light source for photo-thermal polymerization reaction. The second-stage screw extruder 12 is provided with a discharge port 3, a devolatilization port 6 is arranged near the discharge port 3, the devolatilization port 6 is connected with a condenser through a connecting pipe provided with a ball valve, and the other end of the condenser is connected with a vacuum pump. The length-to-diameter ratio of the screw of the first stage screw extruder 11 was 50. The coverage of the light-transmitting region was 85%. The coverage indicates the ratio of the length of the light-transmitting zone in the screw axial direction of the first-stage screw extruder 11 to the length of the screw of the first-stage screw extruder 11.
The material tank 7 is used for containing reaction raw materials, a discharge hole of the material tank 7 is connected with a feed inlet of the metering pump 8, a discharge hole of the metering pump 8 is connected with an input port of the photoreaction channel 9, and an output port of the photoreaction channel 9 is connected with a feed inlet 2 arranged on the first-stage screw extruder 11. The photoreaction channel 9 is a glass tube with two circular tubes at two ends and a flat and hollow middle. One side of the glass tube opposite to the light source is provided with a high-light metal aluminum plate as a reflecting layer. The photoreaction channel 9 is provided with an air inlet for introducing inert gas into the photoreaction channel 9.
The present invention is not limited to the above embodiments, and any variations, modifications, and substitutions that may occur to those skilled in the art may be made without departing from the spirit of the present invention.
Claims (10)
1. The photothermal polymerization reaction device is characterized by comprising a screw extrusion device; wherein, near the feed inlet of screw extrusion equipment is provided with the printing opacity district for in passing through the printing opacity district irradiation entering screw extrusion equipment with the light source, near the discharge gate of screw extrusion equipment is provided with the devolatilization mouth.
2. The photothermal polymerization reaction device according to claim 1, wherein:
the length-diameter ratio of a screw of the screw extrusion equipment is more than 40;
the light-transmitting area at least covers a part of a screw area of the screw extrusion equipment, and the coverage rate is 20-100%; wherein the coverage rate represents a ratio of a length of the light-transmitting zone in a screw axial direction of a screw extrusion device to a screw length of the screw extrusion device.
3. The photothermal polymerization reaction device according to claim 1, wherein said screw extruding means comprises at least one-stage screw extruder.
4. The photothermal polymerization reaction device according to claim 1, wherein said screw extruding means comprises a first stage screw extruder and a second stage screw extruder, and the first stage screw extruder and the second stage screw extruder are arranged in series.
5. The photothermal polymerization reaction device according to claim 1, further comprising a light reaction channel for the photothermal polymerization reaction of the reaction raw material to form a pre-reaction product; the photoreaction channel has an output end connected to the feed port and configured to convey the pre-reaction product to the screw extrusion device.
6. The photothermal polymerization device according to claim 5, wherein said light reaction channel has at least one transparent layer, and a light reflecting layer is disposed on a side of said light reaction channel opposite to said light source.
7. The photothermal polymerization reaction device according to claim 6, wherein said light reaction channel has at least two transparent layers, and said light reflecting layer is disposed between the outermost transparent layer and the inner transparent layer.
8. The photothermal polymerization reaction device according to claim 5, wherein said photoreaction channel is provided with a gas inlet through which an inert gas is introduced.
9. The photothermal polymerization reaction device according to claim 5, wherein said photothermal polymerization reaction device further comprises a material tank for containing reaction raw materials; the photoreaction channel also has an input end that is configured to be connectable to the material tank by a metering pump.
10. The photothermal polymerization reaction device according to any one of claims 1 to 9, wherein the photothermal polymerization reaction device is a photothermal polymerization reaction device for bulk polymerization of a vinyl monomer.
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