CN116376177A - Microwave heating continuous vulcanization extrusion type rubber water stop and preparation method thereof - Google Patents
Microwave heating continuous vulcanization extrusion type rubber water stop and preparation method thereof Download PDFInfo
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- CN116376177A CN116376177A CN202310348448.1A CN202310348448A CN116376177A CN 116376177 A CN116376177 A CN 116376177A CN 202310348448 A CN202310348448 A CN 202310348448A CN 116376177 A CN116376177 A CN 116376177A
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- 230000001105 regulatory effect Effects 0.000 claims description 2
- 229920000620 organic polymer Polymers 0.000 abstract description 4
- 239000000047 product Substances 0.000 description 18
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 10
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- 244000043261 Hevea brasiliensis Species 0.000 description 6
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- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 3
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- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
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- 239000012936 vulcanization activator Substances 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
Abstract
The invention discloses a microwave heating continuous vulcanization extrusion type rubber water stop and a preparation method thereof, and belongs to the technical field of rubber materials, wherein the water stop comprises 37% -39% of ethylene propylene diene monomer rubber, 4% -5% of inorganic filler, 33% -35% of reinforcing agent, 18% -20% of plasticizer, 0.5% -1% of defoaming agent, 1% -3% of active agent, 0.8% -1.2% of accelerator and 0.3% -0.5% of vulcanizing agent, the inorganic filler is modified light calcium carbonate, the surface of the light calcium carbonate is coated with a modifier, the modifier is one or more of coupling agent and surfactant, and the light calcium carbonate and organic polymer are tightly combined by the modifier, so that the prepared water stop has higher tensile strength and tearing strength.
Description
Technical Field
The invention belongs to the technical field of rubber materials, and particularly relates to a microwave heating continuous vulcanization extrusion type rubber water stop belt and a preparation method thereof.
Background
The rubber water-stop belt is made up by using natural rubber or various synthetic rubbers as main raw material, adding several auxiliary agents and filling material, and making them pass through the processes of plasticizing, mixing, calendering and vulcanizing.
The rubber water stop can be classified into a buried rubber water stop and a back-attached rubber water stop according to the use condition. The rubber water stop is mainly used for foundation engineering which is arranged in construction joints and deformation joints and integrated with concrete structures during concrete cast-in-situ, such as underground facilities, tunnel culverts, water delivery aqueducts, check dams, liquid storage structures and the like.
The rubber water stop in the prior art mainly comprises rubber, various auxiliary agents, filling materials and other components, the rubber water stop is produced through a compression molding vulcanization processing technology, the production efficiency of products is low, the energy consumption is high, and the hidden danger of insufficient tensile strength exists in product joints. Wherein the rubber matrix is mainly made of natural rubber, ethylene propylene diene monomer rubber and the like.
The following problems generally exist in the production of rubber water stops in the prior art:
(1) The production efficiency of the product is low and the energy consumption is high; (2) The tensile strength of the rubber water stop joint fluctuates greatly, and hidden danger of insufficient tensile strength exists; (3) The problem of poor ageing resistance exists in the production of the rubber water stop belt by using natural rubber as a rubber matrix; (4) Each section of rubber water stop joint has obvious joint marks, which affect the appearance quality of the product.
Through retrieval, the patent publication number is CN106243534A, the publication date is 2016 and 12 months 21, and the rubber water stop belt and the preparation method thereof are disclosed, wherein the rubber water stop belt is prepared from the following raw materials, by weight, 100 parts of chlorinated polyethylene, 20-50 parts of a softening plasticizer, 5-20 parts of an acid absorber, 1-5 parts of a lubricant, 30-80 parts of a composite reinforcing agent, 1-5 parts of a vulcanization activator, 2-10 parts of a vulcanization accelerator and 0.3-2.0 parts of sulfur. The invention also comprises a preparation method of the rubber water stop. The obtained semi-finished product of the mixed rubber sheet is molded by an extruder die, and is shaped into a finished product of the rubber water stop belt by microwave vulcanization. The invention discloses a mildew-proof rubber water stop belt and a preparation process thereof, and relates to the technical field of building waterproof materials, wherein the publication number of the mildew-proof rubber water stop belt is CN107189240A, and the publication date of the mildew-proof rubber water stop belt is 2017, 9 and 22. The composite material comprises the following raw material components in parts by weight: 60-90 parts of EPDM rubber, 10-30 parts of saturated CPE rubber, 5-40 parts of softening plasticizer, 1-2 parts of heat stabilizer, 3-10 parts of PH value regulator, 5-15 parts of mildew inhibitor, 30-120 parts of reinforcing agent, 5-10 parts of cross-linking agent, 3-10 parts of zinc oxide and 1-4 parts of magnesium oxide; 0.5-3 parts of stearic acid and 1-3 parts of polyethylene wax. And (3) molding by an extrusion die, and forming into a finished product of the mildew-proof water stop belt by microwave vulcanization. The scheme discloses that EPDM is used as a base material, carbon black, calcium carbonate and the like are added for reinforcement, but the defect that no defoamer is added can not ensure that sponge defects appear in the rubber material due to the existence of water vapor when continuous extrusion vulcanization is carried out under the condition without pressure, so that the mechanical property of the product is obviously reduced.
In addition, the invention discloses an ethylene propylene diene monomer rubber material which is formed by mixing and vulcanizing a mixture containing ethylene propylene diene monomer rubber, sulfur and a sulfur-containing accelerator, wherein the mixture also contains an additive, and the additive contains a benzimidazole compound and alkane. The calcium oxide is utilized to absorb the moisture contained in the mixture, so that the problem that the strength performance of the ethylene propylene diene monomer material is affected by air holes generated in the ethylene propylene diene monomer material can be prevented, and the vulcanization method can be an infrared-microwave-hot air continuous vulcanization method. The disadvantage is that the added powdery calcium oxide may have uneven dispersion, and local air holes are easily generated in the microwave heating process.
Disclosure of Invention
1. Problems to be solved
Aiming at the problem that the tensile property of a water stop product is poor due to uneven dispersion of inorganic filler in the existing microwave heating continuous vulcanization extrusion type rubber water stop material, the invention provides the microwave heating continuous vulcanization extrusion type rubber water stop and the preparation method thereof.
2. Technical proposal
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the microwave heating continuous vulcanization extrusion type rubber water stop belt comprises the following components in percentage by mass: 37% -39% of ethylene propylene diene monomer rubber, 4% -5% of inorganic filler, 33% -35% of reinforcing agent, 18% -20% of plasticizer, 0.5% -1% of defoamer, 1% -3% of activator, 0.8% -1.2% of accelerator and 0.3% -0.5% of vulcanizing agent.
Furthermore, the inorganic filler is modified light calcium carbonate with surface modification, the crystal form of the inorganic filler is calcite, and the morphology of the inorganic filler is needle-shaped. Light calcium carbonate (Light Calcium Carbonate) also called precipitated calcium carbonate (Precipitated Calcium Carbonate, PCC for short), its chemical formula is CaCO 3 . Light calcium carbonate is produced by chemical processing. It is called light calcium carbonate because its sedimentation volume (2.4-2.8 mL/g) is greater than that of mechanically produced heavy calcium carbonate (1.1-1.9 mL/g). The invention adds the light calcium carbonate with larger sedimentation volume, which has larger specific surface area and can be better mixed with the rest components in the material, the particles of the common light calcium carbonate are in the shape of jujube pits under the condition of fully dispersing, the long diameter is about 5-12 mu m, the short diameter is 1-3 mu m, and the average powder diameter is 2-3 mu m. However, since the surface treatment is not performed, many particles are often aggregated after the formation, dehydration and drying, and the fluidity and dispersibility of the material are affected.
Therefore, the needle-shaped light calcium carbonate is selected, and the light calcium carbonate with the appearance has higher dispersibility and higher fluidity when being added into the components. Further, the light calcium carbonate is subjected to surface modification, the modified light calcium carbonate is prepared by putting light calcium carbonate powder into a high-speed mixer, adding a modifier accounting for 0.5-1% of the mass of the calcium carbonate, and mixing for 10-15 min at the rotating speed of 30-35 r/min under the action of the mixer at the temperature of 90-100 ℃ to ensure that the modifier is uniformly adsorbed on the surfaces of the light calcium carbonate particles, thereby achieving the modification effect.
The modifier is one or more of a coupling agent and a surfactant, one end of the modifier with an inorganism-friendly group can react with the surface of calcium carbonate to form strong chemical bonding, and the other end with the inorganism-friendly group can be subjected to certain chemical reaction or mechanical winding with an organic polymer, so that the two materials with extremely different properties of light calcium carbonate and the organic polymer are tightly combined, and the mechanical properties such as tensile strength, tearing strength and the like of the rubber water stop are improved, and the use safety and stability of the rubber water stop are further improved. The coupling agent is selected from one or more of silane coupling agent, phthalate coupling agent and aluminate coupling agent, and the surfactant is selected from one or more of anionic surfactant, cationic surfactant, nonionic surfactant and high molecular surfactant, and the common surfactants are fatty acids, phosphate esters and quaternary ammonium salts.
Furthermore, the ethylene propylene diene monomer rubber is selected from the EP3960Q and the EPV3666, the rubber with the EP3960Q and the EPV3666 has lower Mooney viscosity, carbon black and various compounding agents are easy to uniformly mix, and the ageing resistance of the water stop belt is greatly improved compared with that of the water stop belt which uses natural rubber as a rubber matrix.
Furthermore, the reinforcing agent is N550 carbon black, and the N550 carbon black sizing material generates less heat during open mixing of an open mill, belongs to semi-reinforcing carbon black and has normal vulcanization speed.
Furthermore, the plasticizer is paraffin oil 25110, the content of aromatic hydrocarbon in the paraffin oil 25110 is extremely low, and the plasticizer has good compatibility with materials such as ethylene propylene diene monomer rubber and butyl rubber. High viscosity, high flash point, difficult ejection and excellent ageing resistance. Can be filled in a large amount in the formula.
Furthermore, caO-80 is selected as the defoamer, wherein the CaO-80 contains 80% of CaO,20% of ethylene propylene rubber carrier and surface active dispersing agent, and is granular and can be uniformly dispersed in the sizing material. When the rubber material is continuously extruded and vulcanized under the condition of no pressure, the sponginess defect of the rubber material caused by the existence of water vapor is avoided, and the tensile strength, the pressure change performance and the like of the product are improved. Compared with the prior art without defoamer or with powdery calcium oxide as defoamer, the defoamer used by the components is CaO-80 in particle shape, can be uniformly dispersed in the sizing material during mixing, and can avoid the decrease of mechanical properties of the product caused by sponginess defect of the sizing material due to the existence of water vapor during continuous extrusion and vulcanization under the condition without pressure. Compared with the mould pressing vulcanization production process, the microwave heating continuous vulcanization is adopted, so that the production efficiency is obviously improved, the energy consumption is reduced, and the product has uniform mechanical properties without joints and has no mould pressing joint marks;
furthermore, the active agent is a compound of ZnO and SA, the mass percentage of the ZnO and the SA is 3:1, and preferably, the ratio of the ZnO to the SA is controlled to be (1-2): 1, so that the whole vulcanization system can be activated, and the crosslinking density and the heat aging resistance of the vulcanized rubber are improved.
Furthermore, the accelerator is a compound of M, CBS and TMTD, preferably, the mass percentage of M, CBS and TMTD is 1:1 (0.4-0.7), and the compound of M, CBS and TMTD is adopted as the accelerator, so that the problems of low vulcanization speed and short induction period of a single accelerator are solved. The total dosage of the compound is reduced, the vulcanization speed of the sizing material is high, the induction period is long, the production safety and the production efficiency are high, and the mechanical property and the reversion resistance of the vulcanized rubber are improved.
Furthermore, the vulcanizing agent is S-80, wherein the S-80 contains 80% of sulfur powder, 20% of ethylene propylene rubber carrier and surface active dispersing agent, and can be quickly mixed into sizing materials and have excellent dispersion, so that the problems that common sulfur powder is easy to agglomerate and difficult to disperse uniformly are avoided.
The invention also discloses a preparation method of the microwave heating continuous vulcanization extrusion type rubber water stop, which comprises the following steps:
step S1, mixing: adding ethylene propylene diene monomer, inorganic filler, reinforcing agent, plasticizer, accelerator and vulcanizing agent, and carrying out mixing treatment on the components by an internal mixer;
step S2, turning: turning and evenly processing the mixed rubber by an open mill;
step S3, molding: extruding, vulcanizing and forming the rubber compound by a single screw extruder and a microwave heating and vulcanizing production line.
Further, during the mixing in the step S1, ethylene propylene diene monomer, inorganic filler and reinforcing agent are firstly added, the pressurizing mixing is carried out for 50-60S, then plasticizer is added, the pressurizing mixing is carried out until the temperature of the rubber rises to 70 ℃, and finally accelerator and vulcanizing agent are added, and the pressurizing mixing is carried out for 30-40S, and then rubber is discharged;
further, in the step S2, the roll gap of the open mill is adjusted to 6-8 mm, and the whole sizing material needs 6-10 passing guide rollers to go back and forth to be subjected to sheet discharging.
Further, the step in step S3 specifically includes: starting power supplies of an extruder and a microwave production line, setting related parameters, selecting a required mouth mold according to a production order, and mounting the mouth mold on the extruder; after the temperature reaches a set value, feeding the adhesive tape into a feeding port of an extruder, wherein the speed of the adhesive tape before the adhesive tape goes out of a machine head is not more than 6r/min; starting a vacuum pump after the sizing material passes through the vacuum pump; the sizing material is extruded and molded by a mouth die and then is pulled by a traction belt to sequentially pass through a high-temperature section, a microwave section, a hot air section 1 and a hot air section 2 for vulcanization and shaping. The setting of relevant parameters determined by combining reasonable proportions of the active agent, the accelerator and the vulcanizing agent in the rubber material mainly depends on the convenience of extrusion molding and vulcanization.
The technological parameters of extrusion vulcanization of the rubber compound by the rubber single screw extruder and the microwave heating vulcanization production line are as follows: setting the temperature of the screw to 65 ℃; setting 70 ℃ for one section; setting 75 ℃ in the second section; setting 80 ℃ in three sections; setting 85 ℃ in four sections; setting the temperature of 90 ℃ in five sections; setting the temperature of the machine head to 90 ℃; the set value of each section temperature of the extruder is mainly determined according to the vulcanization characteristics of the rubber material, the contractility of the extruded semi-finished product, the stability of the product quality and the like. The hot air and microwave bands were all set at 240 ℃.
According to the microwave heating continuous vulcanization extrusion type rubber water stop and the preparation method thereof, the ethylene propylene diene monomer rubber is selected as the rubber water stop matrix, and the inorganic filler, the reinforcing agent, the defoaming agent, the active agent, the plasticizer, the accelerator and the vulcanizing agent are matched to prepare the rubber water stop, so that the traditional compression vulcanization molding mode of the rubber water stop is replaced, the production efficiency of the rubber water stop is improved, the production energy consumption is reduced, the problem of insufficient tensile strength of a product joint is avoided, and the appearance quality of the product is also improved. Meanwhile, the problem of poor ageing resistance of the pure natural rubber water stop belt is solved.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the invention, light calcium carbonate is selected as an inorganic filler, and a coupling agent or a surfactant is adopted as a modifier, so that the surface of the light calcium carbonate is modified, the light calcium carbonate is tightly combined with an organic polymer, and the tensile strength and the tear strength mechanical properties of the rubber water stop belt are improved;
(2) The active agent of the invention adopts a ZnO and SA compound, effectively activates the whole vulcanization system, and improves the crosslinking density and the thermal aging resistance of vulcanized rubber;
(3) The accelerator of the invention adopts the compound of M, CBS and TMTD, which solves the problems of low vulcanization speed and short induction period of a single accelerator, reduces the total consumption of the compound, has the advantages of high vulcanization speed, long induction period, high production safety and production efficiency, and improves the mechanical property and the reversion resistance of vulcanized rubber.
Drawings
The technical solution of the present invention will be described in further detail below with reference to the accompanying drawings and examples, but it should be understood that these drawings are designed for the purpose of illustration only and thus are not limiting the scope of the present invention. Moreover, unless specifically indicated otherwise, the drawings are intended to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.
Fig. 1 is a view showing a water stop product of example 1 of the present invention.
Detailed Description
The following detailed description of exemplary embodiments of the invention refers to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration exemplary embodiments in which the invention may be practiced. While these exemplary embodiments are described in sufficient detail to enable those skilled in the art to practice the invention, it is to be understood that other embodiments may be realized and that various changes to the invention may be made without departing from the spirit and scope of the invention. The following more detailed description of the embodiments of the invention is not intended to limit the scope of the invention, as claimed, but is merely illustrative and not limiting of the invention's features and characteristics in order to set forth the best mode of carrying out the invention and to sufficiently enable those skilled in the art to practice the invention. Accordingly, the scope of the invention is limited only by the attached claims.
The invention provides a microwave heating continuous vulcanization extrusion type rubber water stop belt, which comprises the following components in percentage by mass: 37-39% of ethylene propylene diene monomer rubber, 4-5% of inorganic filler, 33-35% of reinforcing agent, 18-20% of plasticizer, 0.5-1% of defoamer, 1-3% of activator, 0.8-1.2% of accelerator and 0.3-0.5% of vulcanizing agent. The ethylene propylene diene monomer rubber is used for solving the problem of poor ageing resistance of the pure natural rubber water stop belt; the inorganic filler is used for reducing the production cost of the product; the reinforcing agent is used for improving the tensile strength performance of the product; the plasticizer is used for improving the mixing process; the defoamer is used for solving the problem that air holes are generated in the product through microwave heating and vulcanization; the active agent, the accelerator and the vulcanizing agent ensure proper vulcanization characteristics of the rubber material, and can meet the requirement of continuous vulcanization by microwave heating.
The preparation method of the microwave heating continuous vulcanization extrusion rubber water stop belt comprises the following steps:
step S1, mixing: during mixing, ethylene propylene diene monomer, inorganic filler, reinforcing agent and the like are firstly added, the upper plug is lowered for pressurized mixing for 50-60S, then the upper plug is raised, the plasticizer is added, the upper plug is lowered for pressurized mixing until the temperature of the rubber rises to 70 ℃, then the accelerator and the vulcanizing agent are added, and the upper plug is lowered for pressurized mixing for 30-40S, and then rubber is discharged.
Step S2, turning: and (3) turning the rubber compound in the step (1) through an open mill:
the roll gap of the open mill is regulated to 6-8 mm, and the whole sizing material needs 6-10 passing guide rollers to go back and forth to be subjected to sheet discharging.
Step S3, molding: extruding, vulcanizing and forming the rubber compound through a rubber single-screw extruder and a microwave heating and vulcanizing production line, wherein the temperature of the screw of the extruder is set to be 65 ℃; setting 70 ℃ for one section; setting 75 ℃ in the second section; setting 80 ℃ in three sections; setting 85 ℃ in four sections; setting the temperature of 90 ℃ in five sections; setting the temperature of the machine head to 90 ℃; the hot air and microwave bands were all set at 240 ℃.
Table 1 below shows the preparation process of the modified light calcium carbonate of the present invention, and tables 2 and 3 show the component parameters and performance parameters of the water stop belt to which the modified light calcium carbonate described in Table 1 was added.
TABLE 1 preparation process of modified light calcium carbonate of the invention
TABLE 2 parameters of the composition of the Water stops according to the various embodiments of the invention
TABLE 3 Performance parameters of the Water stops of the various embodiments of the invention
| Comparative example | Example 1 | Example 2 | Example 3 | |
| Rubber hardness (SHA) | 63 | 63 | 64 | 64 |
| Tensile Strength (MPa) | 11 | 12 | 12 | 13 |
| Elongation at break (%) | 450 | 478 | 465 | 472 |
Wherein, the components and the process parameters of the comparative example 1 are the same as those of the example 1, except that the inorganic filler is commercially available light calcium carbonate and is not subjected to surface modification. As can be seen from Table 3, the water stop belt prepared by adding the modified light calcium carbonate after surface modification has higher tensile strength and elongation at break compared with the water stop belt prepared by adding the common non-modified light calcium carbonate, which shows that the modified light calcium carbonate has higher binding property with the water stop material.
Claims (10)
1. The microwave heating continuous vulcanization extrusion type rubber water stop belt is characterized by comprising the following components in percentage by mass: 37% -39% of ethylene propylene diene monomer rubber, 4% -5% of inorganic filler, 33% -35% of reinforcing agent, 18% -20% of plasticizer, 0.5% -1% of defoaming agent, 1% -3% of active agent, 0.8% -1.2% of accelerator and 0.3% -0.5% of vulcanizing agent, wherein the inorganic filler is modified light calcium carbonate, the surface of the light calcium carbonate is coated with a modifier, and the modifier is one or more of coupling agent or surfactant.
2. The continuous vulcanization extrusion rubber waterstop of claim 1, wherein the coupling agent is selected from one or more of a silane coupling agent, a phthalate coupling agent, and an aluminate coupling agent, and the surfactant is selected from one or more of an anionic surfactant, a cationic surfactant, a nonionic surfactant, and a polymeric surfactant.
3. The microwave heating continuous vulcanization extrusion type rubber water stop belt as claimed in claim 2, wherein the addition amount of the modifier in the modified light calcium carbonate is 0.5-1 wt% of the light calcium carbonate.
4. A microwave heated continuously vulcanized extruded rubber water stop as defined in claim 3, wherein said modified light calcium carbonate is prepared by the steps of: mixing the light calcium carbonate powder with the modifier for 10-15 min at 90-100 ℃.
5. The microwave-heated continuously-vulcanized extruded rubber water stop strip as set forth in claim 4, wherein the sedimentation volume of the light calcium carbonate is 2.4-2.8mL/g, and the morphology is needle-shaped.
6. The microwave-heated continuous vulcanization extruded rubber water stop of claim 5, wherein the ethylene propylene diene monomer rubber is EP3960Q and EPV3666; n550 carbon black is selected as the reinforcing agent; the plasticizer is paraffin oil 25110; caO-80 is selected as the defoaming agent; s-80 is selected as the vulcanizing agent.
7. The microwave heating continuous vulcanization extrusion type rubber water stop belt as claimed in claim 6, wherein the active agent is a composite of ZnO and SA, and the mass percentage of the ZnO and the SA is (1-2): 1.
8. The microwave heating continuous vulcanization extrusion type rubber water stop belt as claimed in claim 7, wherein the accelerator is a compound of M, CBS and TMTD, and the mass percentage of M, CBS and TMTD is 1:1 (0.4-0.7).
9. A process for preparing a microwave heated continuously vulcanised extruded rubber water stop according to any of claims 1 to 8, comprising the steps of:
step S1, mixing: adding ethylene propylene diene monomer, inorganic filler, reinforcing agent, plasticizer, accelerator and vulcanizing agent, and carrying out mixing treatment on the components by an internal mixer;
step S2, turning: turning and evenly processing the mixed rubber by an open mill;
step S3, molding: extruding, vulcanizing and forming the rubber compound by a single screw extruder and a microwave heating and vulcanizing production line.
10. The method for preparing the continuous vulcanization extrusion type rubber water stop belt by microwave heating according to claim 9, which is characterized in that ethylene propylene diene monomer, inorganic filler and reinforcing agent are firstly added during mixing in the step S1, pressurized mixing is carried out for 50-60S, then plasticizer is added, pressurized mixing is carried out until the temperature of the rubber rises to 70 ℃, and finally accelerator and vulcanizing agent are added, pressurized mixing is carried out for 30-40S, and rubber is discharged;
in the step S2, the roll gap of the open mill is regulated to 6-8 mm, and the whole sizing material needs 6-10 passing guide rollers;
in the step S3, the extrusion and vulcanization process parameters of the rubber single screw extruder and the microwave heating vulcanization production line for the rubber compound are as follows: setting the temperature of the screw to 65 ℃; setting 70 ℃ for one section; setting 75 ℃ in the second section; setting 80 ℃ in three sections; setting 85 ℃ in four sections; setting the temperature of 90 ℃ in five sections; setting the temperature of the machine head to 90 ℃; the hot air and microwave bands were all set at 240 ℃.
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| CN115678121A (en) * | 2022-09-08 | 2023-02-03 | 深圳海源恒业高新材料科技研发有限公司 | Natural rubber-based thermoplastic vulcanized rubber and preparation method thereof |
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| CN107573600A (en) * | 2017-09-06 | 2018-01-12 | 北京化工大学 | A kind of railway tunnel special (purpose) rubber water stop rubber and its preparation technology |
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