CN114950294A - Device for preparing polythioether rubber by continuous photosynthesis - Google Patents

Abstract

A device for preparing polythioether rubber by continuous photosynthesis is disclosed. In the device, a mixing kettle stores solid raw materials for preparing polythioether rubber; Mixed material, the mixed material is injected into the photosynthesis reaction kettle under nitrogen pressure, the flow meter is set between the liquid raw material tank and the mixing kettle to measure the flow rate of the liquid raw material injected into the mixing kettle under nitrogen pressure, and the synthesis reaction kettle is connected with the mixing material Kettle and nitrogen bottle, the photosynthesis reactor includes an ultraviolet light source arranged outside to provide ultraviolet light, the mixture is photosynthesized under ultraviolet light irradiation to generate liquid raw glue, and the liquid raw glue is pushed to the water washing kettle under nitrogen pressure, and the water washing kettle is connected The photosynthesis reactor and the nitrogen bottle are used to wash the liquid raw glue, and the liquid raw glue is transported to the dewatering dryer under nitrogen pressure. The dewatering dryer is connected to the water washing kettle and the nitrogen bottle.

Description

Device for preparing polythioether rubber by continuous photosynthesis

technical field

The invention relates to the technical field of preparation of aviation material polythioether rubber, in particular to a device for preparing polythioether rubber by continuous photosynthesis.

Background technique

A。该产品的大力应用推动了聚硫橡胶的快速发展。我国在1955 年由锦西化工研究院进行中间试验，产量可满足国内需要。苏联、德国、法国、意大利、比利时、日本等都曾有聚硫橡胶生产。目前仅德国、日本、俄罗斯和我国有生产。目前聚硫橡胶仍然是我国航空工业的应用重要材料，聚硫橡胶虽然具备许多优点，但随着应用环境要求的不断提高，液体聚硫橡胶仍然存在着不足，液体聚硫橡胶生胶中含有液体聚硫生胶中含有大量的二硫键，在受热情况下会首先发生断裂，降低了密封剂的耐热性，于是衍生出聚硫醚橡胶。聚硫醚和聚硫橡胶一样在分子主链中含有硫原子，因此拥有聚硫橡胶所具有的优点。而且聚硫醚分子主链中仅含有单硫键即硫醚键(C-S键能为289kJ/mol)，而聚硫橡胶为二硫键(-S-S-键能为246kJ/mol)，因此聚硫醚聚合物耐热性比液体聚硫橡胶高出50℃，聚硫醚生胶的固化过程不受环境湿度的影响，可制备出耐热高达180℃热空气和燃油的密封剂，且使用寿命是聚硫密封剂的3～10倍。美国PRC公司和Dow Corning 公司成功研制出PR-2001、PR-2201和CS5306等数十种不同功能的系列化的航空聚硫醚密封剂。我国对于聚硫代醚橡胶的研究主要是北京航材院和锦西化工研究院，目前仅有少量的国产聚硫代醚产品，液体聚硫代醚的以及其生产设备成为解决当前问题的重中之重。Polysulfide sealant is an elastic sealing material with good adhesion formed by chemical cross-linking (vulcanization) of liquid polysulfide rubber with small molecular weight. Polysulfide sealant has always been the key sealing material used in aero-engines. This is because it has the characteristics of excellent oil resistance, low air permeability and good weather resistance. The raw rubber-liquid polysulfide rubber for preparing polysulfide sealant is obtained by polycondensation of dihaloalkane and alkali metal or alkaline earth metal polysulfide. Synthetic rubber, the structure is [-CH ₂ -CH ₂ -S _x -] _n , due to the more sulfur bonds in its structure, the rubber has good resistance to air, fuel, water vapor, non-polar liquid and atmospheric environment It has a relatively wide temperature range, and is especially suitable for the sealing of aircraft fuel tanks, cockpits, watertight cabins and other parts. In 1838, Swiss scientists reported on polysulfide rubber. In 1928, Thiokol Corp. of the United States first produced liquid tetrasulfide ethylene polymer that can be used for sealing materials.

A. The vigorous application of this product has promoted the rapid development of polysulfide rubber. In my country in 1955, the Jinxi Chemical Research Institute conducted an intermediate test, and the output could meet domestic needs. The Soviet Union, Germany, France, Italy, Belgium, Japan, etc. have all produced polysulfide rubber. Currently only Germany, Japan, Russia and my country have production. At present, polysulfide rubber is still an important material for the application of my country's aviation industry. Although polysulfide rubber has many advantages, with the continuous improvement of application environment requirements, liquid polysulfide rubber still has shortcomings. Liquid polysulfide rubber raw rubber contains liquid Polysulfide raw rubber contains a large number of disulfide bonds, which will first break when heated, reducing the heat resistance of the sealant, so polysulfide rubber is derived. Like polysulfide rubber, polysulfide contains sulfur atoms in the main chain of the molecule, so it has the advantages of polysulfide rubber. Moreover, the main chain of polysulfide molecule only contains monosulfide bonds, namely sulfide bonds (CS bond energy is 289kJ/mol), while polysulfide rubber is disulfide bond (-SS-bond energy is 246kJ/mol), so polysulfide The heat resistance of ether polymer is 50°C higher than that of liquid polysulfide rubber. The curing process of polysulfide raw rubber is not affected by ambient humidity, and it can prepare sealants with heat resistance up to 180°C, hot air and fuel, and has a long service life. It is 3 to 10 times that of polysulfide sealants. American PRC Company and Dow Corning Company have successfully developed dozens of serialized aviation polysulfide sealants with different functions, such as PR-2001, PR-2201 and CS5306. my country's research on polythioether rubber is mainly carried out by Beijing Aviation Materials Research Institute and Jinxi Chemical Research Institute. At present, there are only a small amount of domestic polythioether products. Liquid polythioether and its production equipment have become the key to solving current problems. Heavy.

The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in the art to a person of ordinary skill in the art.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a kind of device for preparing polythioether rubber by continuous photosynthesis, in order to achieve the above purpose, the present invention provides the following technical solutions:

A device for preparing polythioether rubber by continuous photosynthesis of the present invention comprises:

Nitrogen cylinders, which store nitrogen,

a liquid raw material tank, which stores liquid raw materials for preparing polythioether rubber, and the liquid raw material tank is connected to the nitrogen cylinder,

A mixing kettle, which stores solid raw materials for preparing polythioether rubber, the mixing kettle is connected with a liquid raw material tank and a nitrogen cylinder to mix the solid raw materials and the liquid raw materials to form a mixture, and the mixture is injected into the photosynthesis reaction under nitrogen pressure kettle,

a flow meter, which is arranged between the liquid raw material tank and the mixing kettle to measure the flow rate of the liquid raw material injected into the mixing kettle under nitrogen pressure,

The photosynthesis reactor has a transparent structure, and the synthesis reactor is communicated with the mixing kettle and the nitrogen bottle,

The photosynthesis reaction kettle includes an ultraviolet light source set therein to provide ultraviolet light, and the mixture is subjected to photosynthesis reaction under the ultraviolet light irradiation to generate liquid raw gum, and the liquid raw gum is pushed to the water washing kettle under nitrogen pressure,

a water washing kettle, which communicates the photosynthesis reactor and the nitrogen bottle to wash the liquid raw gum, and the liquid raw gum is transported to the dewatering drier under nitrogen pressure,

A water removing dryer is connected to the water washing kettle and the nitrogen bottle, and the water removing dryer dries the liquid raw gum to form the finished raw gum,

The gas washing tank is connected to the mixing kettle, the photosynthesis reactor, the water washing kettle and the dewatering dryer to clean the waste gas.

The device for preparing polythioether rubber by continuous photosynthesis further comprises a fan facing the reaction kettle, and the surface of the reaction kettle is provided with heat sinks.

In the device for preparing polythioether rubber by continuous photosynthesis, the communication pipeline of the nitrogen cylinder is provided with a pressure reducing valve and a solenoid valve.

In the device for preparing polythioether rubber by continuous photosynthesis, the top of the mixing kettle is provided with a solid feeding port.

In the device for preparing polythioether rubber by continuous photosynthesis, the photosynthesis reactor is provided with a pressure gauge for measuring pressure.

In the device for preparing polythioether rubber by continuous photosynthesis, the bottom end of the washing kettle is provided with a waste water outlet for discharging waste water.

In the above technical scheme, the present invention provides a device for preparing polythioether rubber by continuous photosynthesis, which has the following beneficial effects: the device for preparing polythioether rubber by continuous photosynthesis according to the present invention adopts an electrical control system, Integrated raw material tank, mixing kettle, photosynthesis reactor, ultraviolet light source, inert gas protection, circulating cooling system, water washing system, exhaust gas collection and discharge bin, etc., only need to weigh the raw materials and adjust the parameters through the equipment, the equipment can be The automatic execution of the program to carry out the synthesis can not only greatly improve the efficiency of the test, but also because the entire process of the equipment is in a sealed state, it can reduce the release of gas during the synthesis process, and reduce the emission of odors to pollute the environment. , accurate, product controllable and other advantages, sustainable polysulfide rubber modification and polysulfide synthesis, with good sealing, adjustable ratio, controllable pollution, controllable odor, good safety, and greatly improve Efficiency and times of polysulfide synthesis.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only described in the present invention. For some of the embodiments, those of ordinary skill in the art can also obtain other drawings according to these drawings.

FIG. 1 is a schematic structural diagram of an embodiment of an apparatus for preparing polythioether rubber by continuous photosynthesis.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " rear, left, right, vertical, horizontal, top, bottom, inside, outside, clockwise, counterclockwise, etc., or The positional relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, Therefore, it should not be construed as a limitation of the present invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature. In the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may include the first and second features in direct contact, or may include the first and second features Not directly but through additional features between them. Also, the first feature being "above", "over" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature is "below", "below" and "below" the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.

In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

As shown in Figure 1, a device for preparing polythioether rubber by continuous photosynthesis includes:

Nitrogen cylinder 1, which stores nitrogen,

The liquid raw material tank 4 stores the liquid raw material for preparing the polythioether rubber, and the liquid raw material tank 4 communicates with the nitrogen cylinder 1,

The mixing kettle 5 stores the solid raw materials for preparing the polythioether rubber, and the mixing kettle 5 communicates with the liquid raw material tank 4 and the nitrogen bottle 1 to form a mixed material by mixing the solid raw material and the liquid raw material, and the mixed material is at a nitrogen pressure. Inject down into the photosynthesis reactor 7,

A flow meter 18, which is located between the liquid raw material tank 4 and the mixing tank 5 to measure the flow rate of the liquid raw material injected into the mixing tank 5 under nitrogen pressure,

The photosynthesis reactor 7 has a transparent structure, and the synthesis reactor communicates with the mixing kettle 5 and the nitrogen bottle 1,

The photosynthesis reactor 7 includes an ultraviolet light source 8 provided therein to provide ultraviolet light, and the mixture is subjected to photosynthesis reaction to generate liquid raw glue under the irradiation of the ultraviolet light, and the liquid raw glue is pushed to the water washing kettle under nitrogen pressure. 12,

Water washing kettle 12, which communicates the photosynthesis reactor 7 and the nitrogen bottle 1 to wash the liquid raw gum, and the liquid raw gum is transported to the dewatering dryer 14 under nitrogen pressure,

The dewatering dryer 14 is connected to the water washing kettle 12 and the nitrogen cylinder 1, and the dewatering dryer 14 dries the liquid raw gum to form the finished raw gum,

The gas washing tank 17 is connected to the mixing kettle 5, the photosynthesis reactor 7, the water washing kettle 12 and the dewatering dryer 14 to clean the waste gas.

In a preferred embodiment of the device for preparing polythioether rubber by continuous photosynthesis, it further includes a fan 9 facing the reaction kettle, and a cooling fin 10 is provided on the surface of the reaction kettle.

In a preferred embodiment of the device for preparing polythioether rubber by continuous photosynthesis, a pressure reducing valve 2 and a solenoid valve 3 are provided in the communication pipeline of the nitrogen cylinder 1 .

In a preferred embodiment of the device for preparing polythioether rubber by continuous photosynthesis, the top of the mixing kettle 5 is provided with a solid feeding port 6 .

In a preferred embodiment of the device for preparing polythioether rubber by continuous photosynthesis, the photosynthesis reactor 7 is provided with a pressure gauge 11 for measuring pressure.

In a preferred embodiment of the device for preparing polythioether rubber by continuous photosynthesis, the bottom end of the washing kettle 12 is provided with a waste water outlet 13 for discharging waste water.

In one embodiment, the water removal dryer 14 includes a heating resistor 15 for heating.

In one embodiment, the raw materials in the liquid raw material tank 4 are replaced by replacing the raw material tank or filling, and the required initiator and other solid materials are added through the solid feeding port 6 . After the raw materials are injected, the system can be turned on, and the raw materials in the liquid raw material tank 4 are injected into the mixing tank 5 through a flowmeter in the presence of positive pressure nitrogen to be stirred and mixed with the solid raw materials. In the photosynthesis reactor 7, the synthesis reactor is made of transparent quartz material. After the ultraviolet light source 8 is turned on, the photosynthesis reaction starts. During the reaction, the reactor is cooled by a cooling fan 9 and a heat sink 10 for heat dissipation and cooling, and the synthesized liquid raw glue is then passed through nitrogen. It is pushed into the washing kettle 12, and after several times of washing, the waste water is discharged through the outlet 13, and the liquid raw glue is further transported to the dewatering dryer to remove the moisture in the glue, and the finished raw glue after dewatering is sent out through the outlet 16. In the whole gas circuit, the positive pressure gas comes from the gas cylinder 1, and is controlled and opened by the pressure reducing valve and the solenoid valve, while the waste gas in the mixing kettle 5, the photosynthesis reactor 7, the water washing kettle 12 and the water removal dryer is in the process of conveying. Finally, it is uniformly discharged into the scrubbing tank 17 through the exhaust pipe.

In this test machine, the entire experimental process is transported through gas and liquid fluid connections, and there are stirring devices in the mixing and reaction kettles, which first facilitates the cleaning of the system. At the same time, the reaction kettle 7 adopts the method of upper and lower lids, and the center is transparent quartz , which is convenient for the observation of the reaction, as well as for disassembly and cleaning inside the reactor.

In one embodiment, a PLC control system is also included to control the experimental process in the device. Since both the polysulfide and polysulfide rubbers and their raw materials have strong odors, the present invention adopts the method of positive pressure transportation of nitrogen in a closed pipeline. , reduce the emission of odor, and collect the exhaust gas in a centralized manner. The ultraviolet light-induced synthesis reaction of the device can continuously have the advantages of rapidity, accuracy, and controllable products, and promotes the development of the polythioether sealant for aviation in my country.

Finally, it should be noted that the described embodiments are only a part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, those skilled in the art can obtain the results without creative work. All other embodiments fall within the protection scope of the present application.

Certain exemplary embodiments of the present invention have been described above by way of illustration only, and it is needless to say that those skilled in the art may The described embodiments are modified. Accordingly, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of the claims of the present invention.

Claims (6)

1. a device for preparing polythioether rubber by continuous photosynthesis, is characterized in that, it comprises: Nitrogen cylinders, which store nitrogen, a liquid raw material tank, which stores liquid raw materials for preparing polythioether rubber, and the liquid raw material tank is connected to the nitrogen cylinder, A mixing kettle, which stores solid raw materials for preparing polythioether rubber, the mixing kettle is connected with a liquid raw material tank and a nitrogen cylinder to mix the solid raw materials and the liquid raw materials to form a mixture, and the mixture is injected into the photosynthesis reaction under nitrogen pressure kettle, a flow meter, which is arranged between the liquid raw material tank and the mixing kettle to measure the flow rate of the liquid raw material injected into the mixing kettle under nitrogen pressure, The photosynthesis reactor has a transparent structure, and the synthesis reactor is communicated with the mixing kettle and the nitrogen bottle, The photosynthesis reaction kettle includes an ultraviolet light source set therein to provide ultraviolet light, and the mixture is subjected to photosynthesis reaction under the ultraviolet light irradiation to generate liquid raw gum, and the liquid raw gum is pushed to the water washing kettle under nitrogen pressure, a water washing kettle, which communicates the photosynthesis reactor and the nitrogen bottle to wash the liquid raw gum, and the liquid raw gum is transported to the dewatering drier under nitrogen pressure, A water removing dryer is connected to the water washing kettle and the nitrogen bottle, and the water removing dryer dries the liquid raw gum to form the finished raw gum, The gas washing tank is connected to the mixing kettle, the photosynthesis reactor, the water washing kettle and the dewatering dryer to clean the waste gas. 2 . The device for preparing polythioether rubber by continuous photosynthesis according to claim 1 , wherein, preferably, it further comprises a fan facing the reaction kettle, and a cooling fin is provided on the surface of the reaction kettle. 3 . 3 . The device for preparing polythioether rubber by continuous photosynthesis according to claim 1 , wherein the communication pipeline of the nitrogen cylinder is provided with a pressure reducing valve and a solenoid valve. 4 . 4 . The device for preparing polythioether rubber by continuous photosynthesis according to claim 1 , wherein the top of the mixing kettle is provided with a solid feeding port. 5 . 5 . The device for preparing polythioether rubber by continuous photosynthesis according to claim 1 , wherein the photosynthesis reactor is provided with a pressure gauge for measuring pressure. 6 . 6 . The device for preparing polythioether rubber by continuous photosynthesis according to claim 1 , wherein the bottom end of the washing kettle is provided with a waste water outlet for discharging waste water. 7 .

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