The production technology and equipments of methyl vinyl silicone rubber
Technical field
The present invention relates to the polymerization technique of rubber raw rubber, be specifically related to a kind of production technology and equipments of methyl vinyl silicone rubber.
Background technology
Methyl vinyl silicone rubber is a kind of functional high molecule material, due to the chemical structure of its linear polysiloxanes, be that chain is made up of Si-O-Si key, there is excellent thermo-oxidative stability, weathering resistance, highly air-permeable, electrical insulating property, nontoxic, the incomparable performances of other materials such as physiology inertia, therefore, be widely used in aerospace, electric apparatus, electronics, petrochemical industry, weaving, automobile, medicine, food-processing and daily goods manufacture field, be described as " industrial monosodium glutamate ", high-tech and the upgrading and optimization of industrial structure are brought into play to the effect becoming more and more important, 21 century to develop one of indispensable type material.Rubber both can be used as base mateiral, can be added into other material and improve its performance by functional material again, and no matter be bulk product or marketable special product, all belong to the fine chemical product of height capital intensive, high added value.But in existing production technique, general device output investment ratio is larger, technique falls behind, and also has certain pollutent and discharges.
Summary of the invention
Technical problem to be solved by this invention be to provide a kind of prepare molecular weight evenly, the production technology and equipments of the methyl vinyl silicone rubber of superior performance.
Technical problem to be solved by this invention realizes by the following technical solutions,
The production technology and equipments of methyl vinyl silicone rubber, it is characterized in that: the production unit of described methyl vinyl silicone rubber, formed by strainer, scale tank, dehydrating kettle, volume pump, preheater, polymerization cylinder, de-low molecule device, Nitrogen plant, vacuum pump and discharging machine etc., described strainer is connected with dehydrating kettle by scale tank, dehydrating kettle is connected with preheater by volume pump, described preheater connects polymerization cylinder by pipeline, polymerization cylinder is connected with de-low molecule device, and described de-low molecule device connects discharging machine by pipeline.
Described vacuum pump is connected with dehydrating kettle and de-low molecule device.
Described dehydrating kettle connects Nitrogen plant.
The production technique of methyl vinyl silicone rubber, its step is,
1, filter entering strainer after the metering of DMC (dimethyl siloxane) suction scale tank;
2, to dehydrating kettle vacuumize, by DMC suction dehydrating kettle, add a certain amount of VMC (vinyl ring body), add-on number determine according to the contents of ethylene of rubber, also pour in strainer suction dehydrating kettle together into;
3, dehydration for the first time, heats up to the material in dehydrating kettle, continues dehydrating kettle to vacuumize, to dehydrating kettle nitrogen blowing bubbling, nitrogen flow is controlled at about 0.2m3/h simultaneously, in the time that temperature in the kettle is raised to 70 DEG C, stop heating, maintain 70 DEG C of the interior temperature of charge of still, dewater 7 hours.
4, dehydration for the second time, dehydration for the first time finishes, cooling to the DMC in dehydrating kettle, treats that temperature is down to 45 DEG C, stop cooling, the alkali glue and the closure agent that add proportional quantity, the major ingredient of closure agent is Tetramethylammonium hydroxide, continues to keep vacuumizing, nitrogen bubble 30 minutes, stop vacuum, eliminate vacuum with nitrogen, make to keep the above malleation of 0.01Mpa for subsequent use in dehydrating kettle.
5, polymerization, opens volume pump dehydration material is entered to the polymerization of polymerization cylinder through dehydrating kettle, volume pump, preheater.
6, de-low molecule, de-low molecule device is heated, temperature remains on 155~190 DEG C, when on de-low molecule device, part is full of material, cooling de-low molecule device, open vacuum pump de-low molecule device is vacuumized, regulate DEG C left and right, temperature to 155~190, make the temperature of sizing material be controlled at 155 DEG C~175 DEG C, sizing material is under silk noil shape extension, removes rapidly low molecule under vacuum.
7, plastic emitting, in the time that glue is arranged at de-low molecule device bottom, opens discharging machine and regulates the rotating speed of continuous discharge machine to make to have remained a small amount of sizing material in funnel, in order to avoid air bleeds.
The invention has the beneficial effects as follows: the present invention is energy-conservation, environmental protection, output increases, and sewage discharge is low etc., and the product stability of output is good, weathering resistance, highly air-permeable, electrical insulating property, nontoxic.
brief description of the drawings
Fig. 1 is the block diagram of present device;
Fig. 2 is the flow chart of steps of technique of the present invention.
embodiment
For technique means, creation characteristic that the present invention is realized, reach object and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
As shown in Figure 1, the production unit of methyl vinyl silicone rubber, by strainer 1, scale tank 2, dehydrating kettle 3, volume pump 4, preheater 5, polymerization cylinder 6, de-low molecule device 7, Nitrogen plant 10, vacuum pump 9, the formations such as 9` and discharging machine 8, strainer 1 is connected with dehydrating kettle 3 by scale tank 2, dehydrating kettle 3 is connected with preheater 5 by volume pump 4, preheater 5 connects polymerization cylinder 6 by pipeline, polymerization cylinder 6 is connected with de-low molecule device 7, de-low molecule device 7 connects discharging machine 8 by pipeline, vacuum pump 9, 9` is connected with dehydrating kettle 3 and de-low molecule device 7, dehydrating kettle 3 connects Nitrogen plant 10.
As shown in Figure 1 and Figure 2, the production technique of methyl vinyl silicone rubber, its step is,
1, DMC (dimethyl siloxane) suction strainer 1 is filtered;
2, to dehydrating kettle vacuumize, by DMC suction dehydrating kettle 3 after scale tank 2 measures, add a certain amount of VMC (vinyl ring body), add-on number determine according to the contents of ethylene of rubber, also can pour in strainer suction dehydrating kettle 3 together into;
3, dehydration for the first time, material in dehydrating kettle 3 is heated up, continue dehydrating kettle 3 to vacuumize by vacuum pump 9, use Nitrogen plant 10 to dehydrating kettle 3 nitrogen blowing bubblings simultaneously, nitrogen flow is controlled at about 0.2m3/h, in the time that temperature in the kettle is raised to 70 DEG C, stops heating, maintain 70 DEG C of the interior temperature of charge of still, dewater 7 hours.
4, dehydration for the second time, dehydration for the first time finishes, cooling to the DMC in dehydrating kettle 3, treats that temperature is down to 45 DEG C, stop cooling, the alkali glue and the closure agent that add proportional quantity, the major ingredient of closure agent is Tetramethylammonium hydroxide, continues to keep vacuumizing, nitrogen bubble 30 minutes, stop vacuum, eliminate vacuum with nitrogen, make to keep the above malleation of 0.01Mpa for subsequent use in dehydrating kettle.
5, polymerization, opens volume pump 4 dehydration material is entered to 6 polymerizations of polymerization cylinder through dehydrating kettle 3, preheater 5.
6, de-low molecule, de-low molecule device 7 is heated, temperature remains on 155~190 DEG C, when on de-low molecule device, part is full of material, cooling de-low molecule device, open vacuum pump 9` de-low molecule device 7 is vacuumized, regulate DEG C left and right, temperature to 155~190, make the temperature of sizing material be controlled at 155 DEG C~175 DEG C, sizing material is under silk noil shape extension, removes rapidly low molecule under vacuum.
7, plastic emitting, in the time that glue is arranged at de-low molecule device 7 bottoms, opens discharging machine 8 and regulates the rotating speed of continuous discharge machine to make to have remained a small amount of sizing material in funnel, in order to avoid air bleeds.
More than show and described ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and specification sheets, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.