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CN-121650165-B - Preparation process and equipment of low-odor ethylene propylene diene monomer

CN121650165BCN 121650165 BCN121650165 BCN 121650165BCN-121650165-B

Abstract

The invention discloses a preparation process and equipment of low-odor ethylene propylene diene monomer rubber, and relates to the technical field of rubber processing, comprising a frame body; the device comprises a negative pressure tank, a charging box, a plurality of parallel strip seams, a sealing cover, a heat tracing system, a sealing cover, a feeding box and a sealing cover, wherein the sealing cover is arranged on one side of the negative pressure tank and can be opened, the heat tracing system is arranged outside the negative pressure tank, the upper part and the lower part in the negative pressure tank are symmetrically and fixedly connected with slide ways, the charging box is connected onto the slide ways on the upper part of the negative pressure tank in a sliding manner and is used for charging and discharging vulcanized rubber compound, and the bottom plate of the charging box is provided with the plurality of parallel strip seams. According to the invention, the pressure difference formed by negative pressure is utilized to drive bubbles to naturally separate out, so that the rubber structure damage and hole residue caused by puncture are radically avoided, the mechanical property of the product is completely reserved, the product is made into a sheet shape by mechanical extrusion, the migration path of the bubbles from the inside to the surface of the rubber is greatly shortened by utilizing the sheet shape, the migration resistance of the bubbles in the rubber is reduced, and the technical bottleneck that the bubbles are difficult to discharge due to the need of breaking through the strong resistance of a thick adhesive layer in a simple negative pressure environment is solved.

Inventors

  • WANG YOUFU
  • YANG XIN
  • CHANG JINLIANG
  • PENG BIN

Assignees

  • 高逸汽车零部件(大连)有限公司

Dates

Publication Date
20260505
Application Date
20260123

Claims (9)

  1. 1. The low-odor ethylene propylene diene monomer preparation equipment comprises a frame body (1) and is characterized by further comprising: The negative pressure tank (2) is fixedly arranged on the frame body (1), one side of the negative pressure tank (2) is provided with a sealing cover which can be opened, the negative pressure tank (2) is provided with a heating and temperature control system which is used for enabling a working area in the tank to accurately reach and maintain at a first temperature T1 or a second temperature T2, and slide ways (3) are symmetrically and fixedly connected to the upper part and the lower part in the negative pressure tank (2); the feeding box (4) is connected onto the slideway (3) at the upper part of the negative pressure tank (2) in a sliding way and is used for feeding vulcanized rubber compound, and a plurality of mutually parallel strip slits (6) are formed in the bottom plate of the feeding box (4); The extrusion part is used for extruding sizing materials and comprises an electric push rod (8) fixedly arranged at the top of the negative pressure tank (2), the movable end of the electric push rod (8) extends to the inside of the negative pressure tank (2) and is fixedly connected with a pressing block (9), and the shape of the pressing block (9) is matched with the shape of the inner cavity of the feeding box (4); The forming box (5) is connected to the slideway (3) at the lower part of the negative pressure tank (2) in a sliding way and is used for receiving the extruded lamellar sizing material, the shape of the inner cavity of the forming box (5) is matched with that of the pressing block (9), and the forming box (5) and the feeding box (4) are fixed with the negative pressure tank (2) through quick-release locks (26).
  2. 2. The low-odor ethylene propylene diene monomer preparation equipment is characterized in that a bottom plate of the feeding box (4) is of an openable structure and comprises two templates (7) which are symmetrically connected to two sides of the bottom of the feeding box (4) in a rotating mode, a strip gap (6) is formed in the templates (7), one end of a rotating shaft of the templates (7) is fixedly connected with a worm wheel (13), one side of the feeding box (4) is fixedly connected with a transmission box (10), two sides of the inner wall of the transmission box (10) are respectively and rotatably connected with a worm (11), one side, close to the transmission box (10), of the feeding box (4) is fixedly connected with a double-shaft motor (12), the output ends of the double-shaft motor (12) are respectively and fixedly connected with the two worms (11), and the worm wheel (13) and the worm (11) are in one-to-one correspondence and meshed connection.
  3. 3. The low-odor ethylene propylene diene monomer preparation equipment according to claim 2, wherein two side plates (20) are symmetrically and fixedly connected in the negative pressure tank (2), a plurality of picking frames are fixedly connected to the two side plates (20), the picking frames are in one-to-one correspondence with the strip slits (6), the picking frames comprise mounting parts (21) and scraping parts (22), the width of the scraping parts (22) is matched with the width of the strip slits (6), a diversion table (24) is fixedly connected to the top of a slideway (3) positioned below, an inclined surface is arranged at the top of the diversion table (24), and the diversion table (24) is close to the strip slits (6) The height of the middle position is lower than the height of the periphery.
  4. 4. The low-odor ethylene propylene diene monomer preparation equipment is characterized in that supporting seats (14) are fixedly connected to the inside of the negative pressure tank (2) and located on two sides of the sliding way (3), a bidirectional screw (16) is rotatably connected between the inner sides of the supporting seats (14), two sliding blocks (17) are symmetrically connected with the outside of the bidirectional screw (16) in a threaded mode, the sliding blocks (17) are slidably connected with the supporting seats (14), supporting rods (18) are hinged to one sides of the sliding blocks (17), supporting blocks (19) are hinged between one ends, far away from the sliding blocks (17), of the two supporting rods (18), the supporting blocks (19) are in contact with the bottoms of the templates (7), and a folding and unfolding motor (15) is fixedly installed on one side of the supporting seats (14), and the output end of the folding and unfolding motor (15) is fixedly connected with one end of the bidirectional screw (16).
  5. 5. The low-odor ethylene propylene diene monomer preparation device according to claim 4, wherein a plurality of vibrators (23) are fixedly arranged on one side, far away from a feeding box (4), of the template (7), a chamfer (25) is arranged on one side, far away from a rotation shaft of the template (7), of the template, the chamfer (25) and an inclined plane at the top of the diversion table (24) are 45 degrees, and the length of the template (7) is smaller than the distance between the bottom of the diversion table (24) and the rotation shaft of the template (7) and is larger than the distance between the top of the diversion table (24) and the rotation shaft of the template (7).
  6. 6. The low-odor ethylene propylene diene monomer preparation device of claim 5, wherein anti-sticking coatings are arranged on the surfaces of the feeding box (4), the forming box (5), the pressing block (9), the template (7) and the picking frame, and the anti-sticking coatings are Teflon anti-sticking coatings.
  7. 7. A process for preparing low-odor ethylene propylene diene monomer rubber, which is characterized by being suitable for the low-odor ethylene propylene diene monomer rubber preparation equipment as claimed in any one of the claims 1-6, and comprising the following steps: S1, mixing, namely mixing ethylene propylene diene monomer rubber, a compounding agent and a vulcanizing agent to obtain uniform and vulcanizable rubber compound; S2, negative pressure sheeting and defoaming, namely placing the rubber compound capable of being vulcanized in a closed negative pressure environment, forming the rubber compound into a sheet shape through mechanical extrusion at a first temperature T1, and removing bubbles by utilizing the combined action of the sheet shape and the negative pressure, wherein the first temperature T1 is higher than the softening temperature of rubber material but lower than the rapid vulcanization starting temperature of a vulcanization system; s3, hot-pressing vulcanization molding, namely superposing the defoamed flaky sizing material under the condition of maintaining negative pressure, then raising the temperature to a second temperature T2, and applying pressure at the temperature T2 to carry out hot pressing, wherein the second temperature T2 is higher than the first temperature The temperature T1 reaches the temperature range of the rapid crosslinking reaction of the vulcanization system, so that the vulcanization crosslinking reaction of the sizing material and the hot press forming process are synchronously completed, and a compact vulcanized rubber block is obtained; s4, post-treatment, namely cooling, blanking and packaging the rubber block.
  8. 8. The preparation process of the low-odor ethylene propylene diene monomer rubber is characterized in that in the step S4, the thickness of a lamellar sizing material is 5-10 mm, the closed negative pressure environment is a low vacuum environment, the vacuum degree is controlled to be minus 0.07-minus 0.09MPa, the first temperature T1 is 70-90 ℃, and the second temperature T2 is 160-180 ℃.
  9. 9. The process for preparing a low odor ethylene propylene diene monomer rubber as set forth in claim 7, wherein said vulcanizing agent is a peroxide vulcanizing agent, and said first temperature T1 is lower than a decomposition temperature of said peroxide vulcanizing agent.

Description

Preparation process and equipment of low-odor ethylene propylene diene monomer Technical Field The invention relates to the technical field of rubber processing, in particular to a preparation process and equipment of low-odor ethylene propylene diene monomer rubber. Background Ethylene Propylene Diene Monomer (EPDM) is a synthetic rubber obtained by copolymerizing ethylene, propylene and a small amount of non-conjugated diene, and is widely used in the fields of automobile seals, building waterproofing, and the like by virtue of excellent weather resistance, ozone resistance and chemical stability. However, the odor problem has long plagued the industry, the odor mainly comes from catalyst remained in raw rubber, aromatic softening agent, decomposition product of vulcanizing agent and filler impurity volatile, and the low odor EPDM requirement is particularly prominent in odor-sensitive scenes such as automobile interior trim. The existing ethylene propylene diene monomer preparation process takes EPDM raw rubber as a main body, and is completed by the procedures of proportioning, mixing, plasticizing, filtering, extrusion molding, vulcanization, inspection, packaging and the like through matching with chemical additives and filling materials. However, in the production, the vulcanizable rubber compound raw material is easy to form a large amount of bubbles due to the air involved in the mixing and trace gas generated by vulcanization reaction, and is difficult to eliminate in extrusion molding, so that the final product has the defects of air holes, looseness and the like, thereby not only directly affecting the mechanical property and sealing reliability of the product, but also becoming an important source of product peculiar smell. The internal bubbles form a Volatile Organic Compounds (VOCs) enrichment area and a rapid migration channel in microcosmic mode, on one hand, trace low-molecular residues, processing aids and decomposition products generated in the mixing and vulcanization process are wrapped in the bubbles and are difficult to escape, on the other hand, a large number of micro-bubbles greatly increase the specific surface area of the rubber, and when the product is heated or pressed in subsequent use, a concentrated and rapid release path is provided for the odor substances, so that the odor problem of the product is remarkably aggravated. In order to solve the problem of bubbles, the prior art proposes a preparation process (bulletin No. CN 115230044B) of ethylene propylene diene monomer, which comprises the following steps of heating a plurality of raw materials to enable the raw materials to be in a fluid state for mixing, mixing the mixed raw materials for rubber, checking the mixed products, vulcanizing the checked raw materials, extruding the vulcanized and transported raw materials for rubber, and finishing blanking and packaging. The preparation process of the ethylene propylene diene monomer is realized by using the ethylene propylene diene monomer, and the device comprises a device for extrusion The shaping frame of rubber, one side of shaping frame slides there is the door plant, rotates on the shaping frame has a plurality of plectanes, all slides on a plurality of plectanes has the slotting tool that can cut the rubber raw materials. Can be produced by breaking pores in the accumulated rubber raw material. According to the scheme, the slotting tool is used for cutting rubber to destroy air holes, and the slotting tool is driven to puncture accumulated rubber through a rotating circular plate on the forming frame to realize physical foam breaking. However, the method has obvious defects that firstly, tiny holes are left in rubber by the penetration of a slotting tool, the slotting tool becomes a new bubble gathering point instead, so that the defoaming effect is poor, secondly, the rubber texture after vulcanization is harder, the slotting tool is difficult to completely penetrate through a thick rubber layer, bubbles are easy to cut and disperse and are not completely discharged, the continuous structure of the rubber is damaged by the penetration, the mechanical property of a product is reduced, and the problem of bubble residues between layers cannot be solved. Disclosure of Invention The invention aims to provide a preparation process and equipment of low-odor ethylene propylene diene monomer rubber, which are used for solving the problems that the effect is poor and new bubbles are easy to introduce in a physical foam breaking mode in the background technology. In order to solve the technical problems, the invention adopts the following technical scheme: a preparation process of low-odor ethylene propylene diene monomer rubber comprises the following steps: S1, mixing, namely mixing ethylene propylene diene monomer rubber, a compounding agent and a vulcanizing agent to obtain uniform and vulcanizable rubber compound; S2, negative pressure sheeting and defoaming, namely plac