Rubber strip for sealing and production process thereof
阅读说明：本技术 一种密封用橡胶条及其生产工艺 (Rubber strip for sealing and production process thereof ) 是由 裘佳秋 于 2020-07-25 设计创作，主要内容包括：一种密封用橡胶条及其生产工艺,用于解决传统工艺中由于流程不优化而产生的生产成本较高以及具有一定生产风险且橡胶条用于室外环境实用性较差的技术问题。包括送料、挤出、喷涂硅胶、硫化、冷却、切断,镀膜其中硫化包括热空气硫化和微波硫化,并将微波硫化至于热空气硫化的过程之中；使用该生产线可以达到与传统工艺中生产的成品密封用橡胶条的质量一样的情况下,缩短了生产线的长度,降低了生产成本,且由于去掉了超高温定形这个工序极大降低了生产成本和生产风险,且在成品密封用橡胶条上镀膜使得其在室外使用环境中不会滋生细菌也不会沾附灰尘,实用性更好使用寿命也更长。(A rubber strip for sealing and a production process thereof are used for solving the technical problems that the production cost is high due to non-optimization of the process in the traditional process, certain production risk exists, and the practicability of the rubber strip for outdoor environment is poor. Feeding, extruding, spraying silica gel, vulcanizing, cooling and cutting off, wherein the film coating vulcanization comprises hot air vulcanization and microwave vulcanization, and the microwave vulcanization is carried out in the hot air vulcanization process; the production line can be used for shortening the length of the production line and reducing the production cost under the condition that the quality of the finished product rubber strip for sealing produced in the traditional process is the same, and the production cost and the production risk are greatly reduced due to the removal of the ultra-high temperature setting process, and the finished product rubber strip for sealing is coated with a film so that the finished product rubber strip for sealing cannot breed bacteria and cannot be adhered with dust in an outdoor use environment, so that the production line has better practicability and longer service life.)
1. A production process of a rubber strip for sealing comprises feeding, extruding, spraying silica gel, vulcanizing, cooling and cutting, and is characterized in that the feeding, extruding, spraying silica gel, vulcanizing, cooling and cutting are arranged in sequence, and the production process further comprises a coating film arranged after the cutting process;
in the extrusion procedure, the precision requirement of the neck ring mold of the used extruder is one half of the tolerance in the secondary requirement in a neck ring mold standard tolerance table, and the minimum tolerance is not less than +/-0.3 mm;
in the film coating process, a film layer with a sterilization function and a self-cleaning function is coated on the surface of the finished product rubber strip for sealing obtained through the cutting process.
2. The production process of the rubber strip for sealing as claimed in claim 1, wherein the length of the vulcanizing tank in the vulcanizing process is 24-30 m.
3. The production process of the rubber strip for sealing as claimed in claim 1, wherein the working temperature of the extruder is 45-60 ℃.
4. The process for producing a rubber strip for sealing as claimed in claim 1, wherein the cooling liquid in the cooling tank in the cooling step is water.
5. The production process of the rubber strip for sealing as claimed in claim 1, wherein in the step of spraying silica gel, the air-suction type spraying box is used to spray silica gel in a mist form, and the mist silica gel liquid sprayed to the outside of the rubber strip for sealing is absorbed by a filter screen in the air-suction type spraying box, and then the silica gel liquid on the filter screen is purified by active carbon.
6. The production process of the rubber strip for sealing as claimed in claim 5, wherein the silica gel liquid is a modified polyurethane resin.
7. The utility model provides a rubber strip for sealing which characterized in that, includes the rubber strip main part for the finished product is sealed and plates in proper order at the outer multilayer sol membrane cladding material and the sterile layer of the rubber strip main part for the finished product is sealed.
8. The strip of claim 7, wherein the plurality of sol-gel coating layers comprise a nano-silica-alumina sol-gel coating layer and a titanium dioxide sol-gel coating layer, wherein the nano-silica-alumina sol-gel coating layer is directly coated on the surface of the finished strip, and the titanium dioxide sol-gel coating layer is coated on the nano-silica-alumina sol-gel coating layer.
9. The strip of claim 8, wherein the sterilizing layer comprises a nano silver layer coated on the titanium dioxide sol-gel film coating and an epoxy resin layer coated on the outer side of the nano silver layer.
Technical Field
The invention relates to the technical field of automobile part processing, in particular to a rubber strip for sealing and a production process thereof.
Background
The traditional production process flow of the rubber strip for sealing comprises the following steps: feeding, extruding, ultra-high temperature setting, vulcanizing, cooling, cutting off and spraying silica gel, wherein the vulcanizing process comprises microwave vulcanizing and hot air vulcanizing; the ultrahigh temperature setting in the production process has the function of ensuring the shape of the section of the rubber strip, but the process of ultrahigh temperature setting consumes energy and has high production risk; simultaneously arrange the process of spraying silica gel in the middle process of vulcanization process in this process, rubber strip after the spraying silica gel needs the hot-air vulcanization of longer time just can reach the vulcanization requirement, so just need be equipped with longer vulcanization groove and carry out hot-air vulcanization to the rubber strip after carrying out the spraying silica gel and handle, the length of vulcanization groove can exceed 45 meters in the vulcanization process, longer production line has improved manufacturing cost, and the rubber strip is often used for outdoor environment, breed the bacterium easily and be stained with the practicality relatively poor that attaches the dust and lead to the rubber strip.
Disclosure of Invention
The invention aims to provide a rubber strip for sealing and a production process thereof aiming at the defects of the prior art, and aims to solve the technical problems that the production cost is high, the production has certain risks and the practicability is poor due to the fact that the rubber strip is placed in an outdoor environment due to the fact that the production process flow is not optimized in the background art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a production process of a rubber strip for sealing comprises feeding, extruding, silica gel spraying, vulcanizing, cooling and cutting, wherein the feeding, extruding, silica gel spraying, vulcanizing, cooling and cutting are sequentially arranged, and the production process further comprises a coating film arranged after the cutting process;
in the extrusion procedure, the precision requirement of the neck ring mold of the used extruder is one half of the tolerance in the secondary requirement in a neck ring mold standard tolerance table, and the minimum tolerance is not less than +/-0.3 mm;
in the film coating process, a film layer with a sterilization function and a self-cleaning function is coated on the surface of the finished product rubber strip for sealing obtained through the cutting process.
Further, the length of a vulcanizing tank in the vulcanizing procedure is 24-30 m.
Further, the working temperature of the extruder is 45-60 ℃.
Further, the cooling liquid in the cooling tank in the cooling step is water.
Furthermore, in the silica gel spraying process, the air suction type spraying box is adopted to spray the silica gel in a vaporific mode, vaporific silica gel liquid sprayed out of the sealing rubber strip is adsorbed by the filter screen in the air suction type spraying box, and the silica gel liquid on the filter screen is purified by the active carbon.
Further, the silica gel liquid is modified polyurethane resin.
The rubber strip for sealing obtained by the production process comprises a finished product rubber strip main body, and a plurality of sol film coating layers and sterilization layers which are sequentially plated outside the finished product rubber strip main body for sealing.
Further, the multilayer sol-gel film coating comprises a nano-silicon-aluminum sol-gel film coating and a titanium dioxide sol-gel film coating, the nano-silicon-aluminum sol-gel film coating is directly plated on the surface of the finished product sealing rubber strip, and the titanium dioxide sol-gel film coating is plated on the nano-silicon-aluminum sol-gel film coating.
Further, the sterilization layer comprises a nano silver layer coated on the titanium dioxide sol film coating and an epoxy resin layer coated on the outer side of the nano silver layer.
The invention has the beneficial effects that:
the production process of the invention removes the step of the ultra-high temperature setting process, replaces the action of the ultra-high temperature setting process by improving the precision of a die of an extruder and optimizing the whole production line, saves more energy, adjusts the process of spraying the silica gel to be before the vulcanization process, does not need to additionally provide a vulcanization tank for carrying out vulcanization treatment on the rubber strip after spraying the silica gel to meet the vulcanization requirement, ensures the vulcanization degree when the length of the vulcanization tank is less than 30m in the vulcanization process, reduces the length of the vulcanization tank, synchronously reduces the length of the whole production line, reduces the production cost, reduces the production risk by removing the ultra-high temperature setting process, and greatly reduces the production risk to the environment, Injury of personnel and factory buildings.
Meanwhile, the invention also adds a film coating process, and the surface of the rubber strip is coated with a film coating layer with a sterilization function and a self-cleaning function, so that bacteria can not be bred and dust can not be attached in the long-time use of the indoor environment, and the practicability of the rubber strip is better.
Drawings
FIG. 1 is a schematic view of a flow chart of the present embodiment;
FIG. 2 is a schematic cross-sectional view of a rubber strip;
FIG. 3 is a table of standard tolerances for die accuracy.
Description of reference numerals: 100. the finished rubber strip body for sealing; 101. coating a nano silicon-aluminum sol film; 102. a titanium dioxide sol film coating; 103. a nano silver layer; 104. and an epoxy resin layer.
Detailed Description
The technical solution of the present invention is further explained with reference to the drawings and the embodiments.
A production process of a rubber strip for sealing comprises the steps of processing a rubber sheet master batch into the rubber strip with qualified quality through a mode of flow line production, wherein the production process flow comprises feeding, extruding, silica gel spraying, vulcanizing, cooling, cutting and coating, and the rubber sheet master batch is processed differently according to the flow to obtain a qualified finished product.
Taking the production of a sealing rubber strip with a circular cross-sectional dimension of 15mm as an example for explanation of the technical scheme, as shown in fig. 3, the dimension of 15mm falls within the range of 10-18 mm, at this time, the standard tolerance of the mouth mold is ± 0.6, the tolerance of the high-precision mouth mold used in the invention is ± 0.3, and if the sealing rubber strip with other specifications is produced, debugging is performed according to the tolerance requirement of general precision corresponding to the second-level requirement in the mouth mold standard tolerance table until the mouth mold precision is adjusted to be one half of the tolerance corresponding to the mouth mold standard tolerance table, but the minimum tolerance is not less than ± 0.3.
As shown in fig. 1:
(1) feeding: feeding film master batch which takes ethylene propylene diene monomer as a main component and is proportioned with a certain amount of carbon black, zinc oxide, stearic acid, an anti-aging agent and the like into a feed inlet of an extruder; the film master batch does not need to be preheated, namely the film master batch in the natural environment is directly fed into a feed inlet of an extruder, and the preheated film master batch can reduce energy loss.
(2) Extruding: the rubber sheet master batch enters an extruder from a feed inlet to be stirred and melted, and is continuously extruded through a high-precision neck ring die at the head part of the extruder to obtain a section of rubber strip for sealing;
at the moment, the temperature of the extruder is 50 ℃, the melting time is 60-80 s, the size of a neck ring mold is 15mm, the tolerance is +/-0.3 mm, and the linear speed of the extruded section of rubber strip for sealing is 12 m/s.
(3) Spraying silica gel: spraying silica gel liquid on the extruded section of rubber strip for sealing;
firstly, the direction of a spray head of the automatic silica gel spraying machine and the size of spray need to be adjusted manually, after the adjustment is finished, continuous instant spraying is carried out on the one-section rubber strip for sealing obtained in the step 2, the spraying thickness is 5-7 micrometers, and after the spraying is finished, the two-section rubber strip for sealing is obtained.
In the process, an automatic silica gel spraying machine is used for carrying out a silica gel spraying process, silica gel liquid used by the automatic silica gel spraying machine is aqueous modified polyurethane resin, after the direction and the spraying size of a spray head of the automatic silica gel spraying machine are adjusted, the automatic silica gel spraying machine starts to continuously spray the atomized silica gel liquid from the spray head, and the sprayed atomized silica gel liquid can be attached to a section of rubber strip for sealing passing through the lower part of the spray head; still can have some vaporific silica gel liquid to spread in the air at the in-process of spraying, although the silica gel liquid of this kind of composition is comparatively environmental protection, nevertheless inhale for a long time and still can cause not good influence to technical staff's healthy, the spraying case of this automatic silica gel spraying machine adopts the formula of induced drafting, the benefit of formula of induced drafting spraying case lies in, the partial vaporific silica gel liquid of suspension in the air can be adsorbed on the filter screen that sets up on the spraying case, can reduce vaporific silica gel liquid suspension in the air the technical staff's of debugged equipment inhaled risk, and the vaporific silica gel liquid of adsorption on the filter screen also can carry out further active carbon purification treatment.
(4) And (3) vulcanization: placing the two-section rubber strip for sealing after the spraying in the
the method comprises the following specific steps:
hot air vulcanization: the two-section rubber strip for sealing after the spraying in the
At this time, the length of the vulcanizing tank is 6m, the vulcanizing time is 30s, and the vulcanizing temperature is 220 DEG C
Microwave vulcanization: placing the two-section rubber strip for sealing after hot air vulcanization treatment into a microwave groove for microwave heating, wherein the rubber strip is still subjected to hot air vulcanization treatment synchronously; microwave heating is to make two-stage seal use rubber strip heat up from inside, and the cooperation begins the surface intensification of the hot-air vulcanization who goes on earlier, and microwave vulcanization heats up from inside, and inside and outside intensification can be better assurance vulcanization effect together.
The microwave heating temperature is 230 ℃, and the microwave power is 3 kw.
Hot air vulcanization: placing the microwave-heated rubber strip for the second-stage sealing into a vulcanizing tank for continuous vulcanization treatment, and obtaining the rubber strip for the third-stage sealing after achieving the vulcanization effect meeting the requirements; the process flow of firstly vulcanizing and then vulcanizing by microwave is more convenient to control, over-vulcanizing or insufficient vulcanizing degree can not be caused, so that the vulcanizing effect is better ensured, the service life of the product is longer, and the service performance is better.
The length of the vulcanization tank at this time was 18m, the vulcanization time was 86s, and the vulcanization temperature was 230 ℃.
(5) And (3) cooling: and (4) cooling the three sections of rubber strips for sealing obtained in the step (4) in a cooling water tank, wherein the cooling water tank adopts water as cooling liquid, the cooling temperature is 13-16 ℃, the cooling time is 25-30 s, and the water is used for cooling, so that pollution is avoided.
(6) Cutting: and 5, primarily cutting the three sections of the rubber strips for sealing after cooling, which are obtained in the step 5, to obtain the finished rubber strips for sealing.
(7) Film coating: and (6) coating the finished sealing rubber strip obtained in the step (6).
The surface of the finished rubber strip for sealing is plated with a nano silicon-aluminum sol film coating by a dipping and pulling method, and then is plated with a titanium dioxide sol film coating by the same method after the nano silicon-aluminum sol film coating is stable, and then is coated with a nano silver layer and then is coated with an epoxy resin layer after the nano silver layer is stable.
As shown in figure 2, the rubber strip for sealing is obtained through the process and comprises a sterilization layer with a sterilization function and a multi-layer sol-gel film coating with a self-cleaning and wear-resisting function, wherein the sterilization layer is coated on the multi-layer sol-gel film coating.
Specifically, the multilayer sol-gel film coating comprises a nano-silica-alumina sol-gel film coating 101 and a titanium dioxide sol-gel film coating 102, the nano-silica-alumina sol-gel film coating 101 is coated on the finished product sealing rubber strip main body 100, and the titanium dioxide sol-gel film coating 102 is coated on the nano-silica-alumina sol-gel film coating 101.
The sterilizing layer comprises two layers, namely a first sterilizing layer and a second sterilizing layer, wherein the first sterilizing layer is coated on the second sterilizing layer, and the second sterilizing layer is coated on the titanium dioxide sol film coating layer 102; the second sterilization layer is a nano silver layer 103, and the first sterilization layer is an epoxy resin layer 104.
The coating layer 101 of the nano silicon-aluminum sol film has a multi-gap structure due to the dispersibility of silicon dioxide, the multi-gap structure can adsorb more water, the titanium dioxide sol film coating layer can degrade organic pollutants adsorbed on the surface of the titanium dioxide sol film coating layer due to the photocatalysis and photoinduced super-hydrophilicity of the titanium dioxide, then the photoinduced super-hydrophilicity and the multi-gap structure of the nano silicon-aluminum sol film coating layer 101 can adsorb more water, and the degraded organic matters can be flushed by the water, so that the rubber strip for sealing has a self-cleaning function.
The nano silver has strong inhibiting and killing effects on dozens of lethal microorganisms such as escherichia coli, gonococcus and the like, and can well kill bacteria in the external air when attached to the surface of the finished product rubber strip for sealing; the epoxy resin has the function of resisting mildew, can inhibit the possibility of possibly generating bacteria, and further has the antibacterial function.
Different from the traditional process: the production process removes the procedure of ensuring the sectional shape of the rubber strip by ultra-high temperature setting, ensures the sectional shape by improving the precision of a neck mold of an extruder and the matching of the whole production line, is more energy-saving, and adjusts the procedure of spraying the silica gel to the position before vulcanization without additionally providing a vulcanizing tank for spraying the silica gel on the rubber strip for sealing, thereby reducing the length of the vulcanizing tank, namely reducing the length of the whole production line, lowering the production cost, reducing the production risk by removing the ultra-high temperature setting procedure, and greatly reducing the damage to the environment, personnel and plants.
And because the rubber strip for sealing is often used in outdoor environment, adsorb the dust in the air easily, and outdoor environment can be more moist than indoor environment and have the problem that the bacterium multiplied, the bacterium that multiplies can influence the performance of rubber strip, thereby reduce the life of rubber strip for sealing, the coating film can prevent multiplying of bacterium and make rubber strip for sealing have self-cleaning function simultaneously, the dust can not adsorb on the rubber strip, thereby the sterilization function also can guarantee the rubber strip can not influence the use of rubber strip because the problem that the bacterium multiplied in long-term outdoor use.
In summary, the above embodiments are not intended to be limiting embodiments of the present invention, and modifications and equivalent variations made by those skilled in the art based on the spirit of the present invention are within the technical scope of the present invention.
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