CN114672102A - Hydrogen sulfide corrosion resistant rubber waterstop and preparation method thereof - Google Patents

Abstract

The invention belongs to the technical field of rubber water stops, and discloses a hydrogen sulfide corrosion resistant rubber water stop and a preparation method thereof. The main technical scheme is as follows: putting chlorinated polyethylene and a plasticizer into an internal mixer, and mixing until the temperature is rapidly increased or the current is increased; putting a vulcanizing activator, a dispersant and an acid absorbent into an internal mixer for mixing; adding a reinforcing agent and an inorganic functional filler into an internal mixer, and mixing at a mixing temperature not more than 120 ℃; thinly passing the rubber compound on an open mill, cooling to below 80 ℃, adding a vulcanization system, uniformly mixing, and taking out pieces for later use; and extruding the mixed rubber material, and vulcanizing and molding to obtain the rubber for the hydrogen sulfide corrosion resistant rubber waterstop, wherein the tensile strength retention rate of the rubber is kept above 90% and the elongation retention rate of the rubber is kept above 86% in hydrogen sulfide gas for 30 days.

Description

Hydrogen sulfide corrosion resistant rubber waterstop and preparation method thereof

Technical Field

The invention belongs to the technical field of rubber water stops, and relates to a hydrogen sulfide corrosion resistant rubber water stop and a preparation method thereof.

Background

In the construction process of underground engineering, because concrete can not be poured continuously, or because of the reasons such as expansion with heat and contraction with cold of concrete lining, need set up construction joint, movement joint and settlement joint, need install the stagnant water and bring the problem of preventing the percolating water in these seams, but underground environment is complicated, often there is gas to spill over in the construction process of some underground engineering, its principal ingredients is methane, but also contains gases such as hydrogen sulfide, carbon dioxide, carbon monoxide, ammonia, wherein hydrogen sulfide is a gas that has strong corrosivity, can corrode ordinary rubber waterstop, make the performance of waterstop decline, the water-proof effects of greatly reduced waterstop causes the percolating water of structures.

At present, the rubber waterstop is mostly made of ethylene propylene diene monomer or natural rubber, but the macromolecular chain of the rubber contains carbon-carbon double bonds, and hydrogen sulfide gas or hydrogen sulfide water solution can react with the carbon-carbon double bonds in the molecular chain of the rubber to corrode the double bonds, so that the mechanical property of the waterstop is reduced. After the search, the user can search the data file,

chinese patents ZL200910272611.0 and ZL201610473150.3 respectively introduce a hydrogen sulfide corrosion resistant rubber waterstop and a preparation method thereof, and a hydrogen sulfide corrosion resistant water-swelling waterproof rubber sealing material and a preparation method thereof, wherein the two materials have excellent hydrogen sulfide corrosion resistance, but are inserted into the rubber waterstop through rubber intercalationIntoThe method is realized by improving the gas-liquid barrier property of the rubber material among rectorite layers, wherein the rectorite belongs to an inorganic material, has a larger difference with the surface energy of a rubber high polymer material, is difficult to be uniformly dispersed in a rubber matrix, and can cause the reduction of the mechanical property of the water stop if the rectorite is not uniformly dispersed, so that the rectorite surface modification and the mixing process are strictly controlled when the rubber compound is prepared, and the defect of difficult dispersion is caused.

Chinese patent ZL201110178371.5 introduces a tetrapropylene fluoride rubber polymer with acid resistance, alkali resistance and hydrogen sulfide corrosion resistance, but the tetrapropylene fluoride rubber has poor mechanical properties and cannot meet the physical mechanical requirements of rubber waterstops, particularly in the aspects of elongation and constant compression permanent deformation.

Chinese patent ZL201110314814.9 describes a rubber sheet for stereo garage, which has hydrogen sulfide corrosion resistance and flame retardant performance, but the hydrogen sulfide corrosion resistance is realized by adding an oxide pore-plugging agent, the selected pore-plugging agent is nickel oxide or chromium oxide, the substance is heavy metal, which pollutes the environment, and is not suitable for the rubber waterstop field.

Disclosure of Invention

The invention aims to provide a hydrogen sulfide corrosion resistant rubber waterstop and a preparation method thereof, and the rubber waterstop can keep a good waterproof effect for a long time in a hydrogen sulfide gas enrichment area.

In order to achieve the purpose, the technical scheme of the invention is as follows:

the hydrogen sulfide corrosion resistant rubber waterstop is characterized by mainly comprising 100 parts by weight of chlorinated polyethylene, 3-6 parts by weight of an acid absorbent, 1-3 parts by weight of a vulcanization activator, 3-6 parts by weight of a dispersant, 20-40 parts by weight of a plasticizer, 40-60 parts by weight of a reinforcing agent, 20-42 parts by weight of an inorganic functional filler and 3-6 parts by weight of a vulcanization system.

Wherein, the raw materials for forming the hydrogen sulfide corrosion resistant rubber waterstop also comprise:

the chlorinated polyethylene is rubber type chlorinated polyethylene, wherein the chlorine content is 30-36%, the tensile strength is not less than 8MPa, the elongation is not less than 700%, and the Shore hardness is 55-60;

the acid absorbent is one of magnesium oxide or magnesium hydroxide;

the vulcanization activator is polyethylene glycol PEG4000, so that the combination property of the crude rubber and the inorganic filler can be adjusted, the thiazole accelerator can be activated, the Mooney property is reduced, and the vulcanization rate is increased;

the dispersing agent is a mixture of saturated and unsaturated fatty acid zinc;

the plasticizer is an ester plasticizer and mainly is one of dioctyl phthalate (DOP) and dioctyl sebacate (DOS);

the reinforcing agent is one or two of carbon black N330 or N550;

the inorganic functional filler is talcum powder subjected to surface modification by a silane coupling agent or an aluminic acid coupling agent;

the vulcanization system is a mixture of a thiadiazole derivative compound PT75 and a catalyst A903 thereof, and the ratio of the thiadiazole derivative compound PT75 to the catalyst A903 is 1: 0.4-1: 0.7; or a mixture of an accelerant DETU and sulfur, wherein the proportion of the accelerant DETU to the sulfur is 1: 0.5-1: 0.7.

The method for preparing the hydrogen sulfide corrosion resistant rubber waterstop by using the raw materials comprises the following steps:

firstly, putting 100 parts by weight of chlorinated polyethylene and 20-40 parts by weight of plasticizer into an internal mixer, and mixing until the temperature is rapidly increased or the current is increased, namely, the chlorinated polyethylene is indicated to be agglomerated;

secondly, putting 1-3 parts of vulcanization activator, 3-6 parts of dispersant and 3-6 parts of acid acceptor into an internal mixer, and mixing for 30-40 seconds;

thirdly, putting 40-60 parts of reinforcing agent and 20-40 parts of inorganic functional filler into an internal mixer, and mixing for 40-70 seconds at the mixing temperature of not more than 120 ℃;

fourthly, thinning and passing the mixed rubber on an open mill for 2-4 times, wherein the roller distance is 1-2 mm, adding 3-6 parts of a vulcanization system after the temperature is reduced to be below 80 ℃, uniformly mixing and discharging the mixed rubber for later use;

and fifthly, extruding the mixed rubber material by a single screw extruder, and then vulcanizing and molding the extruded rubber material by a vulcanizing box, wherein the temperature of a screw and a machine barrel is set to be 40-70 ℃, the temperature of a first vulcanizing box is set to be 150-165 ℃, the temperature of a second vulcanizing box is set to be 170-180 ℃, then the temperature of the vulcanizing box is set to be 200-230 ℃, and the extrusion speed is 1.0-2.0 m/min.

The invention has the following beneficial effects:

(1) the rubber matrix adopted by the invention is a chlorinated polyethylene rubber material, which is a product of high-density polyethylene after chlorination, the molecular structure does not contain unsaturated chemical bonds such as double bonds and the like, and the chlorinated polyethylene rubber material is a saturated high-molecular elastic material, has excellent weather resistance, ozone resistance, chemical medicine resistance and aging resistance, has good medium resistance, and resists corrosion of various acids and alkalis;

(2) the plasticizer adopted by the invention is an ester plasticizer, mainly dioctyl phthalate (DOP) or dioctyl sebacate (DOS), has good low-temperature performance, can effectively reduce the glass transition temperature of chlorinated polyethylene rubber, enables the chlorinated polyethylene rubber material to still have good elasticity at the temperature of minus 50 ℃, and ensures that the water stop body material is not broken at low temperature;

(3) the performance parameters that should be formed are embodied in six specific embodiments);

(4) the vulcanization system adopted by the invention is a mixture of a thiadiazole derivative compound PT75 and a catalyst A903 thereof or a mixture of an accelerator DETU and sulfur; under the combined action of the amine catalyst A903 and magnesium oxide, the thiadiazole derivative PT75 forms a very stable and firm cross-linked bond, so that very high tensile property, tearing property and heat aging property can be obtained, and vulcanized rubber has low compression set; the cross-linking agent sulfur can rapidly carry out cross-linking reaction under the action of a vulcanization activator and an accelerator DETU, and the formed vulcanized rubber has better corrosion resistance and compression permanent deformation.

Drawings

FIG. 1 is a table of performance parameters tested for the hydrogen sulfide corrosion resistant rubber waterstop prepared according to the present invention.

Detailed Description

In order to better understand the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the following examples.

Example 1

A preparation method of a hydrogen sulfide corrosion resistant rubber waterstop comprises the following steps:

firstly, 100 parts by weight of chlorinated polyethylene and 20 parts by weight of plasticizer dioctyl phthalate (DOP) are put into an internal mixer together, and the mixture is mixed until the temperature is rapidly increased or the current is increased, which indicates that the chlorinated polyethylene is already in a dough shape, and the shearing force of the internal mixer on rubber is larger after the chlorinated polyethylene is in the dough shape, so that the rubber auxiliary agent is more favorably and uniformly mixed;

secondly, putting 1.2 parts of a vulcanization activator polyethylene glycol PEG4000, 3 parts of a dispersant fatty acid polyethylene glycol ester and 3 parts of an acid acceptor magnesium oxide into an internal mixer, and mixing for 35 seconds;

thirdly, 40 parts of reinforcing agent N330 and 20 parts of inorganic functional filler modified talcum powder are put into an internal mixer and mixed for 50 seconds, and the mixing temperature is not more than 120 ℃; the mixing is carried out to 120 ℃, so that the aim of uniformly mixing various rubber additives can be achieved, and the performance reduction caused by the pyrolysis of chlorinated polyethylene due to overhigh mixing temperature can be avoided;

fourthly, thinning and passing the mixed rubber on an open mill for 2-4 times, wherein the roller distance is 1-2 mm, cooling to 50-80 ℃, adding a vulcanization system of chlorinated polyethylene consisting of 2 parts of PT75 and 1.4 parts of A903, uniformly mixing, and taking out a sheet for later use;

and fifthly, extruding the mixed rubber material by a single screw extruder, and then vulcanizing and molding the mixture by a vulcanizing box, wherein the temperature of a screw and a cylinder is set to be 45 ℃, the temperature of a first vulcanizing box is set to be 155 ℃, the temperature of a second vulcanizing box is set to be 175 ℃, the temperature of the vulcanizing box is set to be 210 ℃, and the extrusion speed is 1.1 m/min, so that the hydrogen sulfide corrosion resistant rubber for preparing the water stop belt is formed, and the performance parameters are shown in figure 1.

Example 2

Firstly, 100 parts by weight of chlorinated polyethylene and 25 parts by weight of plasticizer dioctyl sebacate (DOS) are put into an internal mixer together, and the mixture is mixed until the temperature is rapidly increased or the current is increased, which indicates that the chlorinated polyethylene is already agglomerated;

secondly, 2 parts of a vulcanization activator polyethylene glycol PEG4000, 3.5 parts of a dispersant fatty acid polyethylene glycol ester and 4 parts of an acid-absorbing agent magnesium hydroxide are put into an internal mixer and mixed for 30 seconds;

thirdly, putting 45 parts of reinforcing agent N330 and 23 parts of inorganic functional filler into an internal mixer, and mixing for 60 seconds at a mixing temperature not more than 120 ℃;

fourthly, thinning and passing the mixed rubber on an open mill for 2-4 times, wherein the roller distance is 1-2 mm, cooling to 50-80 ℃, adding a vulcanization system consisting of 2.5 parts of PT75 and 1.5 parts of A903, uniformly mixing, and discharging the mixed rubber into sheets for later use;

and fifthly, extruding the mixed rubber material by a single screw extruder, and then vulcanizing and molding the extruded rubber material by a vulcanizing tank, wherein the temperature of a screw and a cylinder is set to be 45 ℃, the temperature of a first vulcanizing tank is set to be 158 ℃, the temperature of a second vulcanizing tank is set to be 180 ℃, the temperature of the vulcanizing tank is set to be 215 ℃, and the extrusion speed is 1.25 m/min, so that the hydrogen sulfide corrosion resistant rubber for preparing the water stop belt is formed, and the performance parameters are shown in figure 1.

Example 3

Firstly, 100 parts by weight of chlorinated polyethylene and 28 parts by weight of plasticizer dioctyl sebacate (DOS) are put into an internal mixer together, and the mixture is mixed until the temperature is rapidly increased or the current is increased (which indicates that the chlorinated polyethylene is already agglomerated);

secondly, putting 1.5 parts of vulcanization activator polyethylene glycol PEG-4000, 3 parts of dispersant fatty acid polyethylene glycol ester and 4.5 parts of acid acceptor magnesium hydroxide into an internal mixer, and mixing for 30 seconds;

thirdly, putting 48 parts of reinforcing agent N330 and 28 parts of inorganic functional filler modified talcum powder into an internal mixer, and mixing for 70 seconds at the mixing temperature of not more than 120 ℃;

fourthly, thinning and passing the mixed rubber on an open mill for 2-4 times, wherein the roller distance is 1-2 mm, adding a vulcanization system consisting of 4 parts of an accelerant DETU and 2 parts of sulfur after the temperature is reduced to be below 80 ℃, uniformly mixing, and taking out the mixed rubber for later use;

and fifthly, extruding the mixed rubber material by a single screw extruder, and then vulcanizing and molding the extruded rubber material by a vulcanizing tank, wherein the temperature of a screw and a machine barrel is set to be 50 ℃, the temperature of a first vulcanizing tank is set to be 160 ℃, the temperature of a second vulcanizing tank is set to be 180 ℃, the temperature of the vulcanizing tank is set to be 220 ℃, and the extrusion speed is 1.2 m/min, so that the hydrogen sulfide corrosion resistant rubber for preparing the water stop belt is formed, and the performance parameters are shown in figure 1.

Example 4

Firstly, 100 parts by weight of chlorinated polyethylene and 35 parts by weight of plasticizer are put into an internal mixer together, and the mixture is mixed until the temperature is rapidly increased or the current is increased (which indicates that the chlorinated polyethylene is already agglomerated);

secondly, 2.3 parts of a vulcanization activator polyethylene glycol PEG4000, 4.2 parts of a dispersant fatty acid polyethylene glycol ester and 5 parts of an acid acceptor magnesium oxide are put into an internal mixer and mixed for 35 seconds;

thirdly, 52 parts of reinforcing agent N330 and 33 parts of inorganic functional filler are put into an internal mixer for mixing for 70 seconds, and the mixing temperature is not more than 120 ℃;

fourthly, thinning and passing the mixed rubber on an open mill for 2-4 times, wherein the roller distance is 1-2 mm, cooling to 50-80 ℃, adding a vulcanization system consisting of 4.2 parts of an accelerant DETU and 2.6 parts of sulfur, uniformly mixing, and then discharging the mixed rubber into a sheet for later use;

and fifthly, extruding the mixed rubber material by a single screw extruder, and then vulcanizing and molding the extruded rubber material by a vulcanizing tank, wherein the temperature of a screw and a machine barrel is set to be 60 ℃, the temperature of a first vulcanizing tank is set to be 155 ℃, the temperature of a second vulcanizing tank is set to be 170 ℃, the temperature of the vulcanizing tank is set to be 220 ℃, and the extrusion speed is 1.3 m/min, so that the hydrogen sulfide corrosion resistant rubber for preparing the water stop belt is formed, and the performance parameters are shown in figure 1.

Example 5

Firstly, 100 parts by weight of chlorinated polyethylene and 37 parts by weight of plasticizer dioctyl phthalate (DOP) are put into an internal mixer together, and are mixed until the temperature is rapidly increased or the current is increased (which indicates that the chlorinated polyethylene is already agglomerated);

secondly, 2.6 parts of a vulcanization activator polyethylene glycol PEG4000, 4.2 parts of a dispersant fatty acid polyethylene glycol ester and 4.0 parts of an acid acceptor magnesium oxide are put into an internal mixer and mixed for 35 seconds;

thirdly, 55 parts of reinforcing agent N330 and 38 parts of inorganic functional filler are put into an internal mixer for mixing for 75 seconds, and the mixing temperature is not more than 120 ℃;

fourthly, thinning and passing the mixed rubber on an open mill for 2-4 times, wherein the roller distance is 1-2 mm, cooling to 50-80 ℃, adding a vulcanization system consisting of 3 parts of PT75 and 1.5 parts of A903, uniformly mixing, and discharging the mixed rubber into sheets for later use;

and fifthly, extruding the mixed rubber material by a single screw extruder, and then vulcanizing and molding the extruded rubber material by a vulcanizing tank, wherein the temperature of a screw and a machine barrel is set to be 60 ℃, the temperature of a first vulcanizing tank is set to be 155 ℃, the temperature of a second vulcanizing tank is set to be 170 ℃, the temperature of the vulcanizing tank is set to be 220 ℃, and the extrusion speed is 1.1 m/min, so that the hydrogen sulfide corrosion resistant rubber for preparing the water stop belt is formed, and the performance parameters are shown in figure 1.

Example 6

Firstly, 100 parts by weight of chlorinated polyethylene and 40 parts by weight of plasticizer dioctyl phthalate (DOP) are put into an internal mixer together, and the mixture is mixed until the temperature is rapidly increased or the current is increased (which indicates that the chlorinated polyethylene is already agglomerated);

secondly, 3 parts of a vulcanization activator polyethylene glycol PEG4000, 6 parts of a dispersant fatty acid polyethylene glycol ester and 5.8 parts of an acid acceptor magnesium hydroxide are put into an internal mixer and mixed for 38 seconds;

thirdly, putting 60 parts of reinforcing agent N330 and 40 parts of inorganic functional filler into an internal mixer, and mixing for 75 seconds at the mixing temperature of not more than 120 ℃;

fourthly, thinning and passing the mixed rubber on an open mill for 2-4 times, wherein the roller distance is 1-2 mm, adding a vulcanization system consisting of 4.0 parts of an accelerant DETU and 2.0 parts of sulfur after the temperature is reduced to be below 80 ℃, uniformly mixing, and then discharging the mixed rubber into a sheet for later use;

and fifthly, extruding the mixed rubber material by a single screw extruder, and then vulcanizing and molding the extruded rubber material by a vulcanizing tank, wherein the temperature of a screw and a machine barrel is set to be 60 ℃, the temperature of a first vulcanizing tank is set to be 155 ℃, the temperature of a second vulcanizing tank is set to be 170 ℃, the temperature of the vulcanizing tank is set to be 220 ℃, and the extrusion speed is 1.25 m/min, so that the hydrogen sulfide corrosion resistant rubber for preparing the water stop belt is formed, and the performance parameters are shown in figure 1.

In the above examples, the inorganic functional filler used is talc powder whose surface is modified by a silane coupling agent or an aluminate coupling agent, and the modification modes of the talc powder are three types: first, wet modification: preparing a certain amount of talcum powder into ore pulp according to the weight ratio of 1: 4-1: 6, adding a coupling agent accounting for 2-6% of the weight of the talcum powder, stirring and modifying the talcum powder by using a dispersing agent at the rotating speed of 1500-2000 rpm, drying the talcum powder at the temperature of 100-110 ℃ after modification, and grinding the talcum powder by using a ball mill until the particle size is below 300 meshes; second, dry modification: weighing a certain amount of talcum powder and a coupling agent accounting for 3-8% of the weight of the talcum powder, putting the talcum powder and the coupling agent into a ball mill, wherein the ball-to-material ratio is 1.5: 1-2: 1, and grinding for 30-45 minutes; third, in-situ modification: the coupling agent is added into the rubber in the rubber processing process, the talcum powder is added after being uniformly mixed, the talcum powder is dispersed and dissociated by utilizing the mechanical shearing force of rubber rolling equipment, and the modification of the talcum powder is completed in the processing process.

The talcum powder is a typical powder with a lamellar structure, the surface energy of the talcum powder can be reduced after modification, the affinity between the talcum powder and a rubber substrate is improved, the tensile strength, the hardness, the heat resistance and the corrosion resistance of a rubber material of the rubber material can be effectively improved after the modified talcum powder is filled, in the rubber mixing process, a macromolecular chain of rubber enters into the lamellar structure of the talcum powder, the compounding of the talcum powder and chlorinated polyethylene rubber at a nano level is realized, and the talcum powder modified by a silane coupling agent or an aluminic acid coupling agent can be more closely combined with the rubber, so that the rubber material has high mechanical property and excellent gas-liquid barrier property, and the corrosion of hydrogen sulfide gas or hydrogen sulfide solution to the rubber material is better prevented.

In addition, domestic chlorinated polyethylene type numbers are generally identified by 135A, 140B, 239C and the like, wherein the first digits 1 and 2 represent the residual crystallinity (TAC value), 1 represents that the TAC value is 0-10%, 2 represents that the TAC value is more than 10%, the 2 nd and 3 rd digits represent the chlorine content, 35 represents that the chlorine content is 35%, the last digit is a letter ABC which is used for representing the molecular weight of the PE raw material, A is the maximum, and C is the minimum. The rubber type chlorinated polyethylene used in this patent application is a type B material, also known as CM.

Claims (10)

1. A rubber waterstop resistant to hydrogen sulfide corrosion is characterized in that: the adhesive mainly comprises the following components in parts by weight:

chlorinated polyethylene 100

3-6% of an acid acceptor

Vulcanization activator 1-3

3 to 6 parts of a dispersant

20-40% of plasticizer

40 to 60% of a reinforcing agent

20-42 parts of inorganic functional filler

And 3-6 of a vulcanization system.

2. The hydrogen sulfide corrosion-resistant rubber waterstop according to claim 1, wherein: the chlorinated polyethylene is rubber type chlorinated polyethylene, wherein the chlorine content is 30-36%, the tensile strength is not less than 8MPa, the elongation is not less than 700%, and the Shore hardness is 55-60.

3. The hydrogen sulfide corrosion-resistant rubber waterstop according to claim 1, wherein: the acid acceptor is one of magnesium oxide or magnesium hydroxide.

4. The hydrogen sulfide corrosion-resistant rubber waterstop according to claim 1, wherein: the vulcanizing active agent is polyethylene glycol PEG 4000.

5. The hydrogen sulfide corrosion-resistant rubber waterstop according to claim 1, wherein: the dispersing agent is a mixture of saturated and unsaturated fatty acid zinc.

6. The hydrogen sulfide corrosion-resistant rubber waterstop according to claim 1, wherein: the plasticizer is an ester plasticizer.

7. The hydrogen sulfide corrosion-resistant rubber waterstop according to claim 1, wherein: the reinforcing agent is one or two of carbon black N330 and carbon black N550.

8. The hydrogen sulfide corrosion-resistant rubber waterstop according to claim 1, wherein: the inorganic functional filler is talcum powder subjected to surface modification by a silane coupling agent or an aluminate coupling agent.

9. The hydrogen sulfide corrosion-resistant rubber waterstop according to claim 1, wherein: the vulcanization system is a mixture of a thiadiazole derivative compound PT75 and a catalyst A903 thereof, and the ratio of the thiadiazole derivative compound PT75 to the catalyst A903 is 1: 0.4-1: 0.7;

or a mixture of an accelerant DETU and sulfur, wherein the proportion of the accelerant DETU to the sulfur is 1: 0.5-1: 0.7.

10. A method of making the hydrogen sulfide corrosion resistant rubber waterstop of claim 1, comprising the steps of:

firstly, putting 100 parts by weight of chlorinated polyethylene and 20-40 parts by weight of plasticizer into an internal mixer, and mixing until the temperature is rapidly increased or the current is increased;

secondly, putting 1-3 parts of vulcanization activator, 3-6 parts of dispersant and 3-6 parts of acid acceptor into an internal mixer, and mixing for 30-40 seconds;

thirdly, putting 40-60 parts of reinforcing agent and 20-40 parts of inorganic functional filler into an internal mixer, and mixing for 40-70 seconds at the mixing temperature of not more than 120 ℃;

fourthly, thinning and passing the rubber compound on an open mill for 2-4 times, wherein the roller distance is 1-2 mm, adding 3-6 parts of a vulcanization system after the temperature is reduced to be below 80 ℃, uniformly mixing and discharging the rubber compound for later use;

and fifthly, extruding the mixed rubber material by a single screw extruder, and then vulcanizing and molding the extruded rubber material by a vulcanizing box, wherein the temperature of a screw and a machine barrel is set to be 40-70 ℃, the temperature of a first vulcanizing box is set to be 150-165 ℃, the temperature of a second vulcanizing box is set to be 170-180 ℃, then the temperature of the vulcanizing box is set to be 200-230 ℃, and the extrusion speed is 1.0-2.0 m/min.

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