A production process for making and forming a cloth-clamped inflatable air-tight seal

Abstract

This invention provides a manufacturing process for a fabric-reinforced inflatable gas-sealing strip, belonging to the field of fabric-reinforced inflatable gas-sealing strip manufacturing technology. The manufacturing process includes the following specific steps: Step 1: First, the rubber raw material is weighed, and then a vulcanizing agent, accelerator, and anti-scorching agent are added to the rubber raw material; Step 2: The rubber raw material is placed in a mixer for mixing, ensuring thorough mixing with the vulcanizing agent, accelerator, and anti-scorching agent; Step 3: The mixed rubber raw material from Step 2 is placed in a rubber extruder, and the mixed rubber raw material is extruded through the rubber extruder. This invention solves the problems of low strength in inflatable gas-sealing strips, excessive expansion due to prolonged compression and air ingress and extrusion, and rubber cracking and aging. The molding die also solves the problems of excessive rubber deformation and failure to obtain the desired shape caused by extrusion molding.

Description

Technical Field

[0001] This invention relates to the field of manufacturing technology for fabric-reinforced inflatable gas sealing strips, specifically to the manufacturing process of fabric-reinforced inflatable gas sealing strips. Background Technology

[0002] Fabric-reinforced inflatable gas sealing strips are made of a saturated polymer. They have excellent resistance to inflation pressure, aging, weathering, electrical insulation, chemical corrosion, and impact elasticity. They also exhibit good wear resistance, airtightness, and sealing performance. To meet the needs of different fields, fabric-reinforced inflatable gas sealing strips are manufactured with different cross-sectional shapes and external shapes, such as square, rectangular, or circular shapes. The radius (R) of square or rectangular strips can be rounded to right angles or any arc.

[0003] However, the strength of the inflatable air seal strip is low. The air seal strip expands and contracts under compression for a long time, resulting in excessive expansion, cracking and aging of the rubber. The rubber deformation caused by the extruder molding is too large, and the desired shape cannot be obtained. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a manufacturing process for a fabric-reinforced inflatable gas sealing strip. This process solves the problems of low strength, excessive expansion and cracking / aging of the rubber caused by prolonged compression and air ingress and extrusion of the inflatable gas sealing strip, and the molding die solves the problems of excessive rubber deformation and failure to obtain the desired shape caused by extrusion molding.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides a molding and manufacturing process for a fabric-reinforced inflatable gas-sealing strip, comprising the following specific steps:

[0008] Step 1: First, weigh the rubber raw material, then add the vulcanizing agent, accelerator, and anti-scorching agent to the rubber raw material;

[0009] Step 2: Place the rubber raw material into an internal mixer for mixing, so that the rubber raw material is fully mixed with the vulcanizing agent, accelerator and anti-scorching agent;

[0010] Step 3: Put the mixed rubber raw material from Step 2 into a rubber extruder, and extrude the mixed rubber raw material through the rubber extruder;

[0011] Step 4: Let the extruded semi-finished rubber strip cool down, then prepare the mold to be formed. Place the fabric in the mold in advance and stick the fabric to the outer wall of the semi-finished rubber strip. Then apply rubber slurry to the outer layer of the fabric and then put the semi-finished rubber strip into the mold to be extruded and formed.

[0012] Step 5: Perform a vulcanization reaction on the fabric-reinforced inflatable gas seal strip formed in Step 4, and then cool the vulcanized rubber strip.

[0013] Step Six: Finally, remove burrs and flash from the manufactured fabric-reinforced inflatable gas sealing strip.

[0014] Preferably, the vulcanizing agent is sulfur, the accelerator is a dithiocarbamate, and the scorching inhibitor is N-cyclohexylthiophthalimide.

[0015] Preferably, the dithiocarbamate is one of zinc dimethyl dithiocarbamate, zinc diethyl dithiocarbamate, zinc dibutyl dithiocarbamate, and zinc ethylphenyl dithiocarbamate.

[0016] Preferably, the mixing time of the internal mixer in step two is 15-30 minutes.

[0017] Preferably, the heating temperature inside the rubber extruder in step three is 70-90 degrees Celsius, and the side shape of the rubber strip extruded by the rubber extruder is cylindrical.

[0018] Preferably, the temperature of the vulcanization reaction in step five is 150-160 degrees Celsius, the pressure is 20 MPa, and the time is 20-30 minutes.

[0019] (III) Beneficial Effects

[0020] This invention provides a manufacturing process for fabric-reinforced inflatable gas-sealing strips. It offers the following advantages:

[0021] 1. This invention improves the strength of the inflatable air seal strip by adding woven fabric inside the semi-finished rubber strip, thus solving the problems of excessive expansion, rubber cracking and aging caused by the expansion and contraction of the inflatable air seal strip during long-term compression and air intake.

[0022] 2. This invention solves the problems of excessive rubber deformation and inability to produce the desired non-standard or irregular shapes by designing the shape of the external forming mold. Attached Figure Description

[0023] Figure 1 A schematic diagram of the cross-section of the fabric-reinforced inflatable airtight strip after molding;

[0024] Figure 2 A schematic diagram of the cross-section of the molding die for the fabric-reinforced inflatable gas sealing strip. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example:

[0027] like Figure 1-2 As shown, this embodiment of the invention provides a molding and manufacturing process for a rubber strip, including the following specific steps:

[0028] Step 1: First, weigh the rubber raw material, then add the vulcanizing agent, accelerator, and anti-scorching agent to the rubber raw material;

[0029] Accelerators are mainly used to shorten the vulcanization time of rubber, reduce energy waste, and improve the crosslinking degree of rubber. Anti-scorching agents can effectively prevent rubber raw materials from scorching during processing, which is conducive to improving production efficiency. At the same time, they have a restorative effect on rubber raw materials that have been subjected to high heat or have slight scorching.

[0030] The selection of rubber raw materials can be based on the environment in which they are used, such as materials that are resistant to high temperatures, low temperatures, acids, or alkalis.

[0031] Step 2: Place the rubber raw material into an internal mixer for mixing, so that the rubber raw material is fully mixed with the vulcanizing agent, accelerator and anti-scorching agent;

[0032] Step 3: Put the mixed rubber raw material from Step 2 into a rubber extruder, and extrude the mixed rubber raw material through the rubber extruder;

[0033] Step 4: Let the extruded semi-finished rubber strip cool down, then prepare the mold to be made into the desired shape. Put the fabric into the mold in advance, and at the same time, stick the fabric to the outer wall of the semi-finished rubber strip. Then, apply rubber slurry to the outer layer of the fabric, and then put the semi-finished rubber strip into the mold to be extruded and shaped.

[0034] The shape of the extruded rubber strip can be determined according to the mold used; only one of the many shapes is listed in this invention.

[0035] Step 5: Perform a vulcanization reaction on the rubber strip formed in Step 4, and then cool the vulcanized rubber strip.

[0036] Step Six: Finally, remove the burrs from the finished rubber strip.

[0037] The addition of fabric inside the product increases the strength of the inflatable air seal strip, solving problems such as excessive expansion, rubber cracking, and aging caused by prolonged compression and airflow. The molding die addresses issues like excessive rubber deformation and the inability to produce desired non-standard or irregular shapes during extrusion molding.

[0038] The vulcanizing agent is sulfur, the accelerator is dithiocarbamate, and the scorching inhibitor is N-cyclohexylthiophthalimide. The dithiocarbamate is one of zinc dimethyl dithiocarbamate, zinc diethyl dithiocarbamate, zinc dibutyl dithiocarbamate, and zinc ethylphenyl dithiocarbamate. The mixing time in the internal mixer in step two is 30 minutes. The heating temperature inside the rubber extruder in step three is 90 degrees Celsius, and the rubber strip extruded by the rubber extruder has a cylindrical shape on the side. The vulcanization reaction temperature in step five is 160 degrees Celsius, the pressure is 20 MPa, and the time is 30 minutes. Without the addition of an accelerator, the vulcanization reaction of the rubber requires approximately 50 minutes.

[0039] Dithiocarbamate accelerators have a fast vulcanization speed and high crosslinking degree, but they are prone to scorching. Improper vulcanization operation can easily lead to under-vulcanization or over-vulcanization. However, anti-scorching agents can prevent rubber raw materials from scorching during processing, which is beneficial to improving production efficiency. At the same time, they have a restorative effect on rubber raw materials that have been subjected to high heat or have slight scorching. Furthermore, anti-scorching agents are used in combination with dithiocarbamate accelerators.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A molding and manufacturing process for a fabric-reinforced inflatable gas-sealing strip, characterized in that: The specific steps include the following: Step 1: First, weigh the rubber raw material, then add the vulcanizing agent, accelerator, and anti-scorching agent to the rubber raw material; Step 2: Place the rubber raw material into an internal mixer for mixing, so that the rubber raw material is fully mixed with the vulcanizing agent, accelerator and anti-scorching agent; Step 3: Put the mixed rubber raw material from Step 2 into a rubber extruder, and extrude the mixed rubber raw material through the rubber extruder; Step 4: Let the extruded semi-finished rubber strip cool down, then prepare the mold to be formed. Place the fabric in the mold in advance and stick the fabric to the outer wall of the semi-finished rubber strip. Then apply rubber slurry to the outer layer of the fabric and then put the semi-finished rubber strip into the mold to be extruded and formed. Step 5: Perform a vulcanization reaction on the semi-finished fabric-reinforced inflatable gas seal strip from Step 4, and then cool the vulcanized fabric-reinforced inflatable gas seal strip. Step Six: Finally, remove burrs and flash from the manufactured fabric-reinforced inflatable gas sealing strip.

2. The molding and manufacturing process of a fabric-reinforced inflatable gas-tight strip according to claim 1, characterized in that: The vulcanizing agent is sulfur, the accelerator is a dithiocarbamate, and the scorching inhibitor is N-cyclohexylthiophthalimide.

3. The manufacturing process of the fabric-reinforced inflatable gas-tight strip according to claim 2, characterized in that: The dithiocarbamates are selected from one of zinc dimethyl dithiocarbamate, zinc diethyl dithiocarbamate, zinc dibutyl dithiocarbamate, and zinc ethylphenyl dithiocarbamate.

4. The manufacturing process of the fabric-reinforced inflatable gas-tight strip according to claim 1, characterized in that: The mixing time in the internal mixer during step two is 15-30 minutes.

5. The manufacturing process of the fabric-reinforced inflatable gas-tight strip according to claim 1, characterized in that: The heating temperature inside the rubber extruder in step three is 70-90 degrees Celsius, and the rubber strip extruded by the rubber extruder has a cylindrical shape on the side.

6. The manufacturing process of the fabric-reinforced inflatable gas-tight strip according to claim 1, characterized in that: In step five, the temperature of the sulfidation reaction is 150-160 degrees Celsius, the pressure is 20 MPa, and the time is 20-30 minutes.

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