Container sealing strip one-time forming method and vulcanizing machine for producing container sealing strip

Abstract

The invention provides a container sealing strip one-time forming method. The container sealing strip one-time forming method comprises the following steps of S1, mixing; s2, injection and vulcanization molding; the injection nozzles are used for injection, so that a sizing material flows into the constant-temperature runner device through the main runner, is conveyed into the multiple groups of injection nozzles arranged in the constant-temperature runner heat insulation plate through the constant-temperature runner device, realizes multi-point injection, and is input into a mold of a vulcanizing machine through the injection nozzles for vulcanization molding; and S3, detecting and packaging. According to the invention, the rubber material with better fluidity is prepared and injected through the injection cylinder, so that the rubber material flows into the constant-temperature runner device through the main runner and is conveyed into the plurality of groups of injection nozzles arranged in the constant-temperature runner heat insulation plate through the constant-temperature runner device, multi-point injection is realized, the rubber material is heated between 150 DEG C and 170 DEG C, and primary vulcanization is carried out; the integrally-formed container sealing strip can be obtained; the technological process is greatly simplified, the production cost is reduced, and the product quality is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of sealing strip processing and forming, and particularly relates to a one-step forming method for container sealing strips. Background Art

[0002] Container sealing strips are suitable for container sealing to ensure the sealing of containers during transportation and prevent the entry of moisture, dust and other external factors.

[0003] Most of the existing container sealing strips adopt the secondary vulcanization molding process. The secondary vulcanization molding process includes extrusion, cutting, vulcanization, secondary cutting, vulcanized joints, testing, packaging and delivery. During the primary vulcanization, the vulcanization degree reaches 70%-80%, and more than 20%-30% is reserved for unvulcanization. Secondary vulcanization is performed at the corners of the sealing strip to meet the requirements of joint vulcanization bonding and one-piece molding.

[0004] There are defects such as complex production process and many quality control points; unstable quality, high production cost, and the corner joints of container sealing strips are prone to breakage.

[0005] Patent publication number: CN209533958U discloses a sealing strip vulcanization system, including a primary vulcanization mechanism and a secondary vulcanization mechanism. When the sealing strip passes through the primary vulcanization mechanism, the primary vulcanization mechanism vulcanizes and cures the sealing strip, and when the sealing strip passes through the secondary vulcanization mechanism, the secondary vulcanization mechanism vulcanizes the sealing strip, so that the sealing strip has excellent bending properties, longer service life and excellent cold and heat resistance. However, the above method cannot ensure the strength of the corner joint of the sealing strip, and it is easy to break. Summary of the invention

[0006] In view of the problems existing in the background technology, the present invention provides a one-step molding method for a container sealing strip, comprising the following steps:

[0007] S1, mixing;

[0008] S2, injection and vulcanization molding,

[0009] ① Set the vulcanization parameters of container sealing strips through the vulcanizer;

[0010] ② Injection is performed through several injection cylinders; the rubber material flows into the constant temperature flow channel device through the main flow channel, and is transported to multiple groups of injection nozzles arranged in the constant temperature flow channel insulation board through the constant temperature flow channel device to achieve multi-point injection, and

[0011] It is input into the mold of the vulcanizer through the injection nozzle;

[0012] ③ The rubber material is heated and vulcanized at 150℃-170℃ to obtain an integrally formed container sealing strip;

[0013] The rubber material used in step S1 includes:

[0014] Mixing A stage:

[0015] 100 parts of EPDM rubber, 2.5 parts of surfactant, 1 part of activator, 2 parts of flow aid, 2 parts of dispersion aid, 8.33 parts of dehumidifier, 140 parts of reinforcing agent; 70 parts of rubber plasticizer, 60 parts of filler.

[0016] Mixing B section:

[0017] Add to the mixed rubber in stage A: 1.2 parts of rubber vulcanizer, 2.7 parts of total vulcanization front stage accelerator, 0.5 parts of vulcanization back stage accelerator, and 0.6 parts of crosslinking delay agent E / C-80.

[0018] Optional pre-vulcanization accelerators include:

[0019] 0.9 parts of zinc diethyldithiocarbamate (CZ-80),

[0020] 0.7 parts of zinc dibutyl dithiocarbamate (BZ-75),

[0021] 0.7 parts of tetramethylthiuram disulfide (TT-80),

[0022] 0.4 parts of ethylene thiourea.

[0023] Optionally, the active agent is preferably zinc oxide (ZNO);

[0024] The activator is preferably stearic acid (St / Acid);

[0025] The flow aid is preferably zinc dibenzyldithiocarbamate (DH);

[0026] The dispersing aid is preferably polyethylene glycol 4000 (PNG4000);

[0027] The dehumidifier is preferably calcium oxide (ANFOGEN #200);

[0028] The reinforcing agent is preferably carbon black (N550);

[0029] The rubber plasticizer is preferably PB7106;

[0030] The filler is preferably calcium carbonate (CaC03)

[0031] The rubber vulcanizing agent in the rubber compound of stage B is preferably sulfur (S-80);

[0032] The latter stage accelerator is preferably dimorpholine disulfide (DTDM-80);

[0033] The cross-linking retarder is preferably sulfonamide (E / C-80).

[0034] Optionally, the mixing process comprises the following steps:

[0035] ①Mixing section A:

[0036] First, 100 parts of EPDM rubber were put into an internal mixer and plasticized for 30 seconds;

[0037] Then, 2.5 parts of active agent (Zno), 1 part of activator, 2 parts of dispersing aid, 2 parts of flow aid, 2 parts of dispersing aid, 8.33 parts of dehumidifier, 140 parts of reinforcing agent, 70 parts of rubber plasticizer, and 60 parts of filler are added in sequence for mixing at a mixing temperature of 140°C-150°C for 450-480 seconds, and

[0038] A stage mixed rubber is obtained;

[0039] ②Mixing Section B:

[0040] First, put the mixed rubber of stage A into the internal mixer;

[0041] Then add 1.2 parts of rubber vulcanizer, 0.9 parts of N-cyclohexyl-2-benzothiazole sulfenamide

[0042] (CZ-80), 0.7 parts of zinc dibutyl dithiocarbamate (BZ-75), 0.7 parts of tetramethylthiuram disulfide (TT-80), 0.4 parts of ethylene thiourea, 0.5 parts of dimorpholine disulfide as a post-stage accelerator and 0.6 parts of a crosslinking delay agent were kneaded at 80°C-100°C for 120 seconds to obtain

[0043] B stage compound rubber.

[0044] Vulcanizing machine for producing container sealing strips, including:

[0045] Upper beam;

[0046] An upper heating assembly is disposed on the upper beam, and

[0047] An injection cylinder for injecting the rubber compound into the mold cavity, and

[0048] Installed on the upper beam; and

[0049] The injection cylinder is distributed on the center line of the upper beam end surface away from the upper heating assembly;

[0050] Lower beam;

[0051] A lower heating assembly disposed on the lower beam;

[0052] Constant temperature flow channel device, and

[0053] A constant temperature flow channel insulation plate connected to the constant temperature flow channel device; and

[0054] The constant temperature flow channel insulation board is provided with multiple groups of injection nozzles.

[0055] The interval between two adjacent groups of injection nozzles is 200-300mm.

[0056] Optionally, the injection nozzle includes a runner for injecting the rubber mixture into the mold cavity, and

[0057] The caliber of the branch channel is 3mm-5mm.

[0058] Optionally, the injection nozzle further includes a cooling cavity,

[0059] The cooling chamber is filled with cooling oil, and

[0060] Used to wrap the branch channel.

[0061] Optionally, the upper beam, the upper insulation manganese plate and the constant temperature flow channel device are provided with an injection port for the injection cylinder to extend into, and

[0062] A main flow channel for conveying rubber material to the injection nozzle in the constant temperature flow channel insulation board.

[0063] Optionally, the upper heating assembly includes an upper heat-insulating manganese plate; and

[0064] An upper heating plate is provided on the end surface of the constant temperature flow channel insulation plate away from the upper insulation manganese plate, and

[0065] The upper heating plate is connected to the upper heat conducting plate;

[0066] The lower heating assembly includes a lower heat conducting plate, and

[0067] The lower heat conducting plate is provided with a mold,

[0068] A lower heating plate is provided on the end surface of the lower heat conducting plate away from the mold position, and

[0069] The lower heating plate is connected to the lower heat-insulating manganese steel plate.

[0070] Optionally, the vulcanizer is 2500-3200 mm long and 1200-2000 mm wide, and is provided with 4-8 columns with a diameter of 110 mm-120 mm.

[0071] In summary, the beneficial effects of the present invention are:

[0072] (1) The present invention prepares a rubber material with better fluidity and injects it through several injection cylinders of a vulcanizer, so that the rubber material flows into a constant temperature flow channel device through a main flow channel and is transported to an injection nozzle through the constant temperature flow channel device to achieve multi-point injection. The rubber material is heated between 150° C. and 170° C. and vulcanized once to obtain an integrally formed container sealing strip; thereby improving the overall performance of the container sealing strip and preventing the container sealing strip from breaking at the corners.

[0073] (2) The present invention greatly simplifies the process flow, reduces production costs by 72%, and improves product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] Figure 1 It is a flow chart of an embodiment of a one-step molding method for container sealing strips of the present invention;

[0075] Figure 2 This is a schematic diagram of the overall structure of an embodiment of a vulcanizing machine for producing container sealing strips according to the present invention;

[0076] Figure 3 This is a schematic diagram of the working surface structure of an embodiment of a vulcanizing machine for producing container sealing strips according to the present invention;

[0077] Figure 4 For the present invention Figure 1 Schematic diagram of the injection nozzle structure;

[0078] Figure 5 Production flow chart for traditional containers;

[0079] Figure 6 This is a flow chart of container production according to this embodiment of the present invention.

[0080] Reference numerals:

[0081] 100. Vulcanizing machine;

[0082] 1011, lower pressure plate; 1012, upper heat-insulating manganese steel plate; 1013, constant temperature flow channel device; 1014, constant temperature flow channel heat-insulating plate; 1015, upper heating plate; 1016, upper heat-conducting plate; 1017, lower heat-conducting plate; 1018, lower heating plate; 1019, lower heat-insulating manganese steel plate;

[0083] 10. Injection cylinder;

[0084] 20. injection nozzle; 201. flow channel; 202. cooling cavity;

[0085] 30. Mould;

[0086] 40. Put up the beam;

[0087] 50. Lower beam;

[0088] 70. Main stream. DETAILED DESCRIPTION

[0089] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. Although exemplary embodiments are disclosed in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to facilitate a thorough understanding of the present invention and to fully convey the concept of the present invention to those skilled in the art.

[0090] In the description of this specification, the description with reference to the terms "certain embodiments", "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0091] In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. 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 circumstances.

[0092] It is well known that when the rubber is vulcanized, it is easy to cause scorching if the temperature is too high, and the fluidity is poor if the temperature is too low.

[0093] The container sealing strip is 3 meters long and 1.5 meters wide, which is a relatively large size. During the vulcanization molding process on a flat plate press vulcanizer, it is difficult to evenly fill the rubber into the entire mold. When the second half is filled, the rubber in the first half has already undergone vulcanization reaction, which in turn affects the performance of the container sealing strip. Therefore, the rubber needs to meet the vulcanization conditions and be able to fully cross-link at a certain temperature to ensure the performance of the rubber sealing strip; at the same time, it is required to have a certain fluidity so that the rubber can be fully and evenly filled into the entire mold, and will not cross-link prematurely, causing scorching. In order to solve the above technical problems, please refer to Figures 1 to 4 As shown, this embodiment provides a one-step molding method for a container sealing strip, comprising the following steps:

[0094] S1, mixing;

[0095] S2, injection and vulcanization molding,

[0096] ① Set the vulcanization parameters of container sealing strips through the vulcanizer;

[0097] ② Injection is performed through several injection cylinders; the rubber material flows into the constant temperature flow channel device through the main flow channel, and is transported to multiple groups of injection nozzles arranged in the constant temperature flow channel insulation board through the constant temperature flow channel device to achieve multi-point injection, and

[0098] It is input into the mold of the vulcanizer through the injection nozzle;

[0099] ③ The rubber material is heated and vulcanized at 150℃-170℃ to obtain an integrally formed container sealing strip;

[0100] S3, test and package, and finally test and package the one-piece container sealing strip and store it in the warehouse.

[0101] The rubber material used in step S1 includes:

[0102] Mixing A stage:

[0103] 100 parts of EPDM rubber, 2.5 parts of surfactant, 1 part of activator, 2 parts of flow aid, 2 parts of dispersion aid, 8.33 parts of dehumidifier, 140 parts of reinforcing agent; 70 parts of rubber plasticizer, 60 parts of filler.

[0104] Mixing B section:

[0105] On the basis of the mixed rubber in stage A, add: 1.2 parts of rubber vulcanizer, 2.7 parts of front stage vulcanization accelerator, 0.5 parts of rear stage vulcanization accelerator, and 0.6 parts of crosslinking delay agent E / C-80.

[0106] Most of the existing container sealing strips are formed by secondary vulcanization. The degree of vulcanization reaches 70%-80% during the primary vulcanization, and more than 20%-30% is reserved for unvulcanization. Secondary vulcanization is performed at the corners of the sealing strip to meet the requirements of co-vulcanization and bonding with the joint rubber material for one-piece molding. In this embodiment, by preparing a rubber material with better fluidity and injecting it through several injection cylinders 10 of the vulcanizer, the rubber material flows through the main channel 70 into multiple groups of injection nozzles 20 arranged in the constant temperature flow channel insulation board 1014, and multi-point injection is achieved, so that the rubber material is heated between 150℃-170℃ and vulcanized once, and an integrally formed container sealing strip can be obtained; the process flow is greatly simplified, the production cost is reduced, and the product quality is improved.

[0107] See also Figure 2 , 3 As shown in Figure 4, the present embodiment provides a vulcanizer 100 for producing container sealing strips. The vulcanizer 100 is 2500mm-3200mm long and 1200mm-2000mm wide. In order to improve stability, the vulcanizer 100 is provided with 4-8 columns with a diameter of 110mm-120mm; the vulcanizer 100 includes an upper beam 40 and an upper heating assembly arranged on the upper beam 40, and the vulcanizer 100 also includes a lower beam 50 arranged opposite to the upper beam 40 and a lower heating assembly arranged on the lower beam 50.

[0108] The upper beam 40 is provided with an injection cylinder 10 for injecting rubber compound into the cavity of the mold 30 . The injection cylinder 10 is arranged on the center line of the end surface of the upper beam away from the upper heating assembly.

[0109] The upper heating assembly includes an upper thermal insulation manganese plate 1012, and a constant temperature flow channel device 1013 is arranged on the end surface of the upper thermal insulation manganese plate 1012 away from the upper beam 40, the constant temperature flow channel device 1013 also includes a constant temperature flow channel insulation plate 1014, and an upper heating plate 1015 is arranged on the end surface of the constant temperature flow channel insulation plate 1014 away from the upper thermal insulation manganese plate 1012, and the heating assembly also includes the upper heat conduction plate 1016 connected to the upper heating plate 1015.

[0110] The upper beam 40 , the upper heat-insulating manganese plate 1012 and the constant temperature flow channel device 1013 are provided with a main flow channel 70 for the injection port of the injection cylinder 10 to extend into; the rubber is injected into the constant temperature flow channel heat-insulating plate 1014 through the main flow channel 70 .

[0111] Furthermore, the constant temperature flow channel insulation board is provided with multiple groups of flow channels 201, and the interval between two adjacent groups of flow channels 201 is 200-300 mm; the preferred diameter is 3mm-5mm.

[0112] The present embodiment provides a plurality of injection cylinders arranged on the center line of the upper beam end surface away from the upper heating assembly, and the multi-component flow channels 201 with a spacing of 200mm-300mm can ensure that the rubber can be evenly filled into the cavity of the mold 30, reduce the probability of aging, and prevent the situation where the rubber in the first half has already undergone vulcanization reaction when the second half is filled, thereby improving the performance of the container sealing strip. At the same time, the air in the mold cavity is discharged by high-pressure extrusion through the branch flow channel 201 with a diameter of 3mm-5mm.

[0113] Furthermore, the lower heating assembly includes a lower heat conducting plate 1017, and a mold 30 is arranged on the lower heat conducting plate 1017, and an oil cylinder for opening the mold is arranged on one side, and a lower heating plate 1018 is arranged on the end surface of the lower heat conducting plate 1017 away from the mold 30, and the lower heating plate 1018 also includes a lower insulating manganese steel plate 1019.

[0114] In this embodiment, by setting a plurality of injection cylinders on the center line of the upper beam end face away from the upper heating assembly and coordinating with a multi-component flow channel 201 with a spacing of 200mm-300mm, the flow distance can be reduced and the rapid flow of the rubber mix into the mold cavity can be improved. However, in actual application, in order to ensure that the rubber can be evenly filled into the cavity of the mold 30, the injection temperature needs to be set to higher than 70°C. However, when the existing rubber is plasticized at 70°C, shallow cross-linking will occur prematurely, causing scorching. Therefore, in order to enable the container sealing strip to be molded in one step and have good performance; the rubber needs to meet the premise of having a certain fluidity and will not cause scorching when it is higher than 70°C. Therefore, in order to solve the above technical problems, please refer to Figure 1-4 As shown, the best ratio is obtained by mixing the formula raw materials in different proportions.

[0115] Pre-vulcanization accelerators include:

[0116] 0.9 parts of zinc diethyldithiocarbamate (CZ-80),

[0117] 0.7 parts of zinc dibutyl dithiocarbamate (BZ-75),

[0118] 0.7 parts of tetramethylthiuram disulfide (TT-80),

[0119] 0.4 parts of ethylene thiourea (NA-22).

[0120] The activator is preferably stearic acid (St / Acid);

[0121] The flow aid is preferably zinc dibenzyldithiocarbamate (DH);

[0122] The dispersing aid is preferably polyethylene glycol 4000 (PNG4000);

[0123] The dehumidifier is preferably calcium oxide (ANFOGEN #200);

[0124] The active agent is preferably zinc oxide (ZNO);

[0125] The reinforcing agent is preferably carbon black (N550);

[0126] The rubber plasticizer is preferably PB7106;

[0127] The filler is preferably calcium carbonate (CaC03)

[0128] The rubber vulcanizing agent in the rubber compound of stage B is preferably sulfur (S-80);

[0129] The latter stage accelerator is preferably dimorpholine disulfide (DTDM-80);

[0130] The cross-linking retarder is preferably sulfonamide (E / C-80).

[0131] The mixing process includes the following steps:

[0132] ①Mixing section A:

[0133] First, 100 parts of EPDM rubber were put into an internal mixer and plasticized for 30 seconds;

[0134] Then, 2.5 parts of active agent (Zno), 1 part of activator, 2 parts of dispersing aid, 2 parts of flow aid, 2 parts of dispersing aid, 8.33 parts of dehumidifier, 140 parts of reinforcing agent, 70 parts of rubber plasticizer, and 60 parts of filler are added in sequence for mixing at a mixing temperature of 140°C-150°C for 450-480 seconds, and

[0135] A stage mixed rubber is obtained;

[0136] ②Mixing Section B:

[0137] First, put the mixed rubber of stage A into the internal mixer;

[0138] Then add 1.2 parts of rubber vulcanizer, 0.9 parts of N-cyclohexyl-2-benzothiazole sulfenamide

[0139] The mixture was mixed with 0.5 parts of 1,2-dithiodimorpholine disulfide as a post-stage accelerator and 0.6 parts of a cross-linking retarder at 80°C-100°C for 120 seconds to obtain a stage B mixed rubber.

[0140] The following examples illustrate the key points of formula design: by adding 1.2 parts of vulcanizer S-80 in the mixing stage B, both the vulcanization requirements of the rubber compound and the process safety are met; by adding 0.5 parts of the later stage accelerator DTDM-80 to strengthen the later stage vulcanization of the rubber compound, the pursuit of vulcanization performance and process safety are balanced; by adding 0.6 parts of the cross-linking retarder E / C-80, the rubber compound will not cross-link at 70°C, and at the same time, the cross-linking speed will be slowed down during the flow in the mold at 150°C-170°C, so as to meet the vulcanization molding after the rubber compound flows to fill the mold.

[0141] In this embodiment, by adding different amounts of vulcanizing agent S-80;

[0142] Purpose: To find out the best dosage in the formula.

[0143] 1-5 in Table 1 are comparative examples containing different amounts of vulcanizing agent S-80 in the mixing B section:

[0144] Comparative Example 1 2 3 4 5 Vulcanizing agent (S-80) 0.8 parts 1.0 copy 1.2 servings 1.4 servings 1.6 servings

[0145] Comparative Examples 1-5 are comparative tests of the effect of the amount of vulcanizing agent on the physical properties of the rubber; the amount of other raw materials remains unchanged, and the processing technology remains unchanged. (Excluding accelerator DTDM-80 and crosslinking delay agent E / C-80)

[0146] The data in Table 1.1 are the test results of 1-5 in Table 1:

[0147] Comparative Example 1 2 3 4 5 Vulcanization pressure (Kg / cm2) 170 170 170 170 170 Vulcanization temperature (℃) 165 165 165 165 165 Tensile strength(MPa) 8 8.5 9.5 9.7 9.2 Elongation at break (%) 350 360 420 350 302 Mooney viscosity (ML100-4) 65 68 72 75 82

[0148] It was determined that when the usage amount of the vulcanizing agent S-80 is 1.2: the tensile strength is 9.5MPA, the elongation at break is 420%; the comprehensive performance is the best; (the optimal usage amount of the vulcanizing agent S-80 is determined to be 1.2 parts).

[0149] In this example, different amounts of 1-5 of the late-stage accelerator DTDM-80 were added to test the optimum dosage in the formula.

[0150] Comparative Examples of 1-5 Accelerators DTDM-80 in Table 2:

[0151]

[0152] Comparative Examples 1-5 are comparative tests of the effect of the amount of the latter stage accelerator DTDM-80 on the physical properties of the rubber; the amount of other raw materials remains unchanged, and the processing technology remains unchanged. (The comparative test is based on the fact that the amount of the vulcanizing agent S-80 used in the test in Table 1 is 1.2 parts).

[0153] The data in Table 2.1 are the test results of 1-5 in Table 2:

[0154]

[0155] It was determined that when the usage of the post-stage accelerator DTDM-80 was 0.5 parts, the tensile strength was 10 MPA, the elongation at break was 430%, and its comprehensive performance was the best; thus, the optimal usage was determined - 0.5 parts of the post-stage accelerator (DTDM-80).

[0156] At this time, the Mooney viscosity is 72ML100-4, which cannot meet the one-time molding injection vulcanization process of container sealing strips.

[0157] Thus, by adding different parts of cross-linking delay agent (E / C-80) in this example;

[0158] Purpose: To find out the best dosage in the formula.

[0159] Table 3 shows the dosage of crosslinking delay agent (E / C-80) in Examples 1-5:

[0160]

[0161] Examples 1-5 are the changes in the amount of crosslinking delay agent E / C-80, the amounts of other raw materials remain unchanged, and the processing technology remains unchanged. (In the test of Table 1, the comparative test based on the use of 1.2 parts of the vulcanizing agent S-80 has been determined; in the test of Table 2, the comparative test based on the use of 0.5 parts of the post-stage accelerator DTDM-80 has been determined)

[0162] Table 3.1 is the test piece verification results of Examples 1-5 in Table 3:

[0163] Comparative Example 1 2 3 4 5 Vulcanization pressure Kg / cm2 170 170 170 170 170 Vulcanization temperature (℃) 170 170 170 170 170 Tensile strength(MPa) 8.3 9 10.5 8.9 8.1 Elongation at break (%) 362 395 442 454 462 Mooney viscosity (ML100-4) 70.2 65.4 60.5 60.2 58.6

[0164] When the usage of the crosslinking delay agent is 0.6 parts: the tensile strength is 10.5 MPA, the elongation at break is 442%, and the Mooney viscosity is 65, and the comprehensive performance is the best; thus, the optimal usage of the crosslinking delay agent (E / C-80) is determined to be: 0.6 parts.

[0165] In this embodiment, the physical properties of the test piece are as follows: tensile strength 10.5MPA, elongation at break 442%. It can be seen that the formula can achieve the best comprehensive performance and fully meet the physical property requirements of container sealing strips; the Mooney viscosity is 60.5ML100-4, which fully meets the requirements of injection vulcanization process.

[0166] Table 4 is the performance test results of container sealing strips of Examples 1-5:

[0167]

[0168] Mooney viscosity is an indicator used to measure the fluidity of rubber compounds at a specific temperature. The higher the Mooney viscosity, the worse the fluidity, and vice versa, the lower the Mooney viscosity, the better the fluidity.

[0169] As can be seen from Table 3.1, by adding 0.5 parts of accelerator (DTDM-80), the physical properties of the rubber compound are improved, and the physical properties requirements of container sealing strips are met. And by adding 0.6 parts of cross-linking delay agent (E / C80), the cross-linking time is extended, the Mooney viscosity is reduced, and the injection vulcanization production process requirements of one-step molding of container sealing strips are met.

[0170] It can be seen from the data in Table 4 that the physical properties of the container sealing strips formed by injection vulcanization in one step are much better than those of the container sealing strips produced by the existing traditional process of secondary corner vulcanization.

[0171] In this embodiment, the present invention prepares a rubber material with better fluidity and injects it through several injection cylinders of a vulcanizer, so that the rubber material flows into multiple groups of injection nozzles arranged in a constant temperature flow channel insulation board through a main flow channel, and realizes multi-point injection, so that the rubber material is heated between 150°C and 170°C and vulcanized once, and an integrally formed container sealing strip can be obtained; and by Figure 5 and Figure 6 By comparison, it can be seen that this embodiment can greatly simplify the process flow and reduce the production cost, and the production cost is reduced by 72%.

[0172] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than specific limiting scopes. Although the present invention is described in detail with reference to the embodiments, it should be understood by those skilled in the art that modifications or equivalent replacements of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and should all be included in the scope of the claims of the present invention.

Claims

1. A one-step molding method for container sealing strips, characterized in that: The following steps are involved: S1, mixing; S2, injection and vulcanization molding, ① Set the vulcanization parameters of container sealing strips through the vulcanizer; ② Injection is performed through several injection cylinders; the rubber material flows into the constant temperature flow channel device through the main flow channel, and is transported to multiple groups of injection nozzles arranged in the constant temperature flow channel insulation board through the constant temperature flow channel device to achieve multi-point injection, and is input into the mold of the vulcanizer through the injection nozzle; ③ The rubber material is heated and vulcanized at 150℃-170℃ to obtain an integrally formed container sealing strip; The rubber material used in step S1 includes: Mixing A stage: 100 parts of EPDM rubber, 2.5 parts of surfactant, 1 part of activator, 2 parts of flow aid, 2 parts of dispersion aid, 8.33 parts of dehumidifier, 140 parts of reinforcing agent; Rubber plasticizer 70 parts, filler 60 parts; Mixing B section: Add to the mixed rubber in stage A: 1.2 parts of rubber vulcanizer, 2.7 parts of total vulcanization front stage accelerator, 0.5 parts of vulcanization back stage accelerator, and 0.6 parts of crosslinking delay agent.

2. The one-step molding method for container sealing strip according to claim 1, characterized in that: Rubber front-end vulcanization accelerators include: 0.9 parts of zinc diethyldithiocarbamate, 0.7 parts of zinc dibutyl dithiocarbamate, 0.7 parts of tetramethylthiuram disulfide, 0.4 parts of ethylene thiourea.

3. The one-step molding method for container sealing strip according to claim 1, characterized in that: The active agent is preferably zinc oxide; The activator is preferably stearic acid; The flow aid is preferably zinc dibenzyldithiocarbamate; The dispersing aid is preferably polyethylene glycol 4000; The dehumidifier is preferably calcium oxide; The reinforcing agent is preferably carbon black; The filler is preferably calcium carbonate; The rubber vulcanizing agent in the rubber compound of stage B is preferably sulfur; The latter stage accelerator is preferably dimorpholine disulfide; The cross-linking delay agent is preferably sulfonamide.

4. The one-step molding method for container sealing strip according to claim 1, characterized in that: The mixing process of step S1 includes: ①Mixing section A: First, 100 parts of EPDM rubber were put into an internal mixer and plasticized for 30 seconds; Then, 2.5 parts of active agent, 1 part of activator, 2 parts of flow aid, 2 parts of dispersing aid, 8.33 parts of dehumidifier, 140 parts of reinforcing agent, 70 parts of rubber plasticizer, and 60 parts of filler are added in sequence for mixing at a mixing temperature of 140°C-150°C for 450-480 seconds. A stage mixed rubber is obtained; ②Mixing Section B: First, put the mixed rubber of stage A into the internal mixer; Then, 1.2 parts of a rubber vulcanizer, 0.9 parts of N-cyclohexyl-2-benzothiazole sulfonamide, 0.7 parts of zinc dibutyl dithiocarbamate, 0.7 parts of tetramethylthiuram disulfide, 0.4 parts of ethylene thiourea, 0.5 parts of a post-stage accelerator dimorpholine disulfide and 0.6 parts of a crosslinking delay agent were added in sequence, and mixed at 80° C.-100° C. for 120 seconds to obtain a stage B mixed rubber.

5. Vulcanizing machine for producing container sealing strips, characterized in that: include: Upper beam; An upper heating assembly is disposed on the upper beam, and An injection cylinder for injecting the rubber compound into the mold cavity, and Installed on the upper beam; and The injection cylinder is distributed on the center line of the upper beam end surface away from the upper heating assembly; Lower beam; A lower heating assembly disposed on the lower beam; Constant temperature flow channel device, and A constant temperature flow channel insulation plate connected to the constant temperature flow channel device; and The constant temperature flow channel insulation board is provided with multiple groups of injection nozzles. The interval between two adjacent groups of injection nozzles is 200-300mm.

6. The vulcanizing machine for producing container sealing strips according to claim 5, characterized in that: The injection nozzle includes a runner for injecting the rubber compound into the mold cavity, and The caliber of the branch channel is 3mm-5mm.

7. The vulcanizing machine for producing container sealing strips according to claim 6, characterized in that: The injection nozzle also includes a cooling cavity, The cooling cavity is filled with cooling oil, and Used to wrap the branch channel.

8. The vulcanizing machine for producing container sealing strips according to claim 6, characterized in that: The upper beam, the upper heat-insulating manganese plate and the constant temperature flow channel device are provided with an injection port for the injection cylinder to extend into, and A main flow channel for conveying rubber material to the injection nozzle in the constant temperature flow channel insulation board.

9. The vulcanizing machine for producing container sealing strips according to claim 5, characterized in that: The upper heating assembly includes an upper heat-insulating manganese plate; and An upper heating plate is provided on the end surface of the constant temperature flow channel insulation plate away from the upper insulation manganese plate, and The upper heating plate is connected to the upper heat conducting plate; The lower heating assembly includes a lower heat conducting plate, and The lower heat conducting plate is provided with a mold, A lower heating plate is provided on the end surface of the lower heat conducting plate away from the mold position, and The lower heating plate is connected to the lower heat-insulating manganese steel plate.

10. The vulcanizing machine for producing container sealing strips according to claim 5, characterized in that: The vulcanizer is 2500mm-3200mm long and 1200mm-2000mm wide, and is provided with 4-8 columns with a diameter of 110mm-120mm.

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