CN113547656A - Production method of corrosion-resistant rubber molded sieve plate - Google Patents
Production method of corrosion-resistant rubber molded sieve plate Download PDFInfo
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- CN113547656A CN113547656A CN202110828209.7A CN202110828209A CN113547656A CN 113547656 A CN113547656 A CN 113547656A CN 202110828209 A CN202110828209 A CN 202110828209A CN 113547656 A CN113547656 A CN 113547656A
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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
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/12—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
- B29B7/58—Component parts, details or accessories; Auxiliary operations
- B29B7/72—Measuring, controlling or regulating
- B29B7/728—Measuring data of the driving system, e.g. torque, speed, power, vibration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/0288—Controlling heating or curing of polymers during moulding, e.g. by measuring temperatures or properties of the polymer and regulating the process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
Abstract
The invention belongs to the technical field of sieve plates, in particular to a production method of a corrosion-resistant rubber mould pressing sieve plate, which does not use the acid-absorbing agent and the acid-binding agent of the prior fluororubber, but uses hydrogen halide released in the vulcanization process of the fluororubber, and uses active hydrogen to carry out crosslinking reaction in the curing process of benzoxazine resin to form chemical bonds so as to achieve the purpose of synchronous crosslinking, improve the brittleness of the benzoxazine resin, increase the mechanical strength of a composite material, and improve the curing rate, thereby being beneficial to reducing the mould pressing forming difficulty of the sieve plate, the sieve plate is prepared by calendering, laminating and stacking the fluororubber, has a basalt framework with high strength, has excellent adhesive force, toughness and compactness, strong permeation resistance, can resist corrosion of various chemicals, has excellent water resistance, acid-base corrosion resistance, high modulus, long service life, high temperature resistance, corrosion resistance and good mechanical property, is safe and reliable.
Description
Technical Field
The invention belongs to the technical field of sieve plates, and particularly relates to a production method of a corrosion-resistant rubber mould pressing sieve plate.
Background
The sieve plate has harsh use conditions, and has requirements of wear resistance, abrasion resistance, aging resistance, and accurate sieve pore and seam size, and the prior sieve plate (mesh) is mainly made of stainless steel, but the metal sieve plate has poor wear resistance, elasticity and corrosion resistance, large noise, high processing cost and short service life, and is being replaced by a polyurethane sieve plate in most occasions. Compared with a metal sieve plate, the polyurethane sieve plate fully exerts the characteristics of polyurethane in the aspects of high wear resistance, high elasticity, sound absorption, vibration reduction and the like, has the advantages of convenience in forming and processing, good wear resistance, long service life, high screening quality, strong self-cleaning capability, good sieve penetration performance, noise reduction, operation environment improvement, wide application range (materials with different particle sizes such as dry materials, wet materials, raw ores and crushed ores) and the like, and has a good prospect when the polyurethane sieve plate is used for replacing the metal sieve plate or a common rubber sieve plate. However, both the polyurethane sieve plate and the metal sieve plate have poor corrosion resistance, and cannot meet the screening application of corrosive minerals. Chinese patent CN207327738U discloses a composite polyurethane strip seam sieve plate with long service life, which is provided with an epoxy resin anticorrosive coating, a wear-resistant coating and a ceramic wear-resistant coating to improve corrosion resistance, but the sieve mesh aims to utilize the wear resistance of polyurethane, and when the anticorrosive coating with poor wear resistance is damaged, the anticorrosive effect cannot be achieved, the essential performance of the polyurethane sieve mesh is not brought into play, and the application effect is not good. In fact, because the polarity of the fluororubber is in place, the fluororubber is difficult to adhere to other frameworks such as metal and the like compared with common rubber, so related products and production methods of corrosion-resistant sieve plates are also available in the market at present, and the sieve plates have the use strength and corrosion-resistant characteristics required by the sieve plates. The development of a method for producing a corrosion-resistant rubber molded sieve plate is urgently needed by the technical personnel in the field.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a production method of a corrosion-resistant rubber molded sieve plate.
The invention is realized by the following technical scheme:
a production method of a corrosion-resistant rubber molded sieve plate comprises the following steps: firstly, adding benzoxazine into a fluororubber mixed sizing material in an open mixing process, and mixing after the open mixing is finished to obtain a rubber-plastic premix; adding a vulcanizing agent in the remilling process to obtain a calendered rubber sheet, wherein the calendered base cloth is a basalt base cloth; the extrusion and the extrusion of the fluororubber sizing material are difficult, the sizing material needs to be fully remilled before being extruded, the plasticized flaky material is pressed into a screw rod of an extruder through a material pressing device, the material is continuously conveyed forwards by the screw rod, the impurities are removed through the filtration of a machine head to extrude the flaky material, the flaky material is conveyed into a calender through a conveying belt, the surface of a roller is damaged for preventing metal from being mixed into the material, and the flaky material needs to pass through a metal detector before entering the calender. The diameter of a screw is 250mm, the length-diameter ratio L/D is 6: 1, the compression ratio is 2, the temperature of a machine barrel is 50-60 ℃, the temperature of a machine neck is 50-60 ℃, the temperature of a machine head is 50-60 ℃, the rolling pressure is 2.5-3 MPa, the temperature of a lower roller during rolling is 40-50 ℃, the temperature of a middle roller is controlled to be 50-60 ℃, and the temperature of an upper roller is controlled to be 70-80 ℃; and thirdly, cutting the rolled rubber sheets into strips, uniformly stacking and filling according to the sieve plate mold, and then carrying out compression molding, vulcanization and post curing to obtain the corrosion-resistant rubber molded sieve plate.
Further, the fluororubber mixed and mixed rubber material in the first step is obtained by sequentially weighing 88-99 phr of fluororubber, 0.5-1 phr of accelerator, 13.5-14.8 phr of microlite ink powder and 0.7-0.98 phr of fluorinated graphene in parts by weight, wherein the accelerator is one of accelerator DZ and accelerator CZ.
And the accelerator in the fluororubber sizing material can ensure that the sizing material has enough fluidity to be beneficial to the penetration of basalt fabrics into holes, and is preferably the accelerator DZ and the accelerator CZ.
The microcrystalline graphite is a dense aggregate composed of fine natural graphite crystals, and is also called as soil graphite or amorphous graphite, and the microcrystalline graphite includes graphite particles and graphite powder. The microcrystalline graphite powder is smooth, easy to stain hands, stable in chemical performance, resistant to high temperature, acid and alkali, corrosion and oxidation. Because the crystal is fine, the plasticity is strong, and the adhesive force is good.
The microlite ink powder has good mixing, extruding and mould pressing properties, the fluorinated graphene can reduce the friction coefficient of fluororubber, improve the wear resistance, obviously reduce friction temperature rise, has corrosion resistance, and is suitable for manufacturing high-vibration-frequency corrosion-resistant screens.
Further, the mixing process in the first step comprises the steps of enabling the speed ratio of a quadrangular rotor to be 1: 1.15-1: 1.18, enabling the rotation speed to be 40-80 rpm, enabling a top bolt to have unit pressure on materials to be 0.2-0.45 MPa, enabling the filling coefficient to be 0.55-0.80, enabling the banburying time to be 10-15 min, enabling the roll-on process to be feeding fluororubber, fluorinated graphene, microcrystalline graphite powder and an accelerator in sequence, adding benzoxazine with the mass being 25-30% of that of the fluororubber after even mixing, enabling the front roll to have the rotation speed of 27.5-28.5 rpm, enabling the front roll speed ratio to be 1.15-1.28, enabling the steam pressure to be 0.4-0.5 MPa, enabling the roll gap to be 2-3 mm, enabling the front roll to have the temperature of 50-55 ℃, enabling the rear roll to have the temperature to be 45 ℃ and enabling the roll to have the thin pass for 8-10 times, enabling the roll-15 min, and enabling the feed to be cooled. Further, the vulcanizing agent is one of N, N-bis-cinnamylidene-1, 6-hexamethylene diamine or hexamethylene diamine carbonate with the mass of 0.5-1% of that of the fluororubber. A vulcanization system: the vulcanizing system of the fluororubber of the invention only contains one component of the vulcanizing agent, does not contain other components, does not need other components, and has simple components.
Among them, hexamethylenediamine carbonate is an organic synthesis intermediate, and is almost exclusively used for the preparation of cyanate esters such as hexamethylene diisocyanate. Further, the basalt base cloth in the second step is a quadriaxial warp knitting basalt fabric impregnated with a mixture of a phenol activating agent and an amine crosslinking agent in a mass ratio of 1:1.15, wherein the impregnation content is 8-10%, the layering structure of yarn bundles is 90 °/-45 °/0 °/45 °, yarn bundles are basalt fiber untwisted rovings, the diameter of basalt fiber precursors is 9-13 μm, the phenol activating agent is one or more of a binding agent RS or a binding agent RE, and the amine crosslinking agent is one or more of hexamethoxymethylmelamine or a binding agent H-80.
The impregnation of the phenolic activating agent and the amine crosslinking agent can improve the calendering combination of rubber and basalt fabrics, the phenolic activating agent and the amine crosslinking agent which are subjected to an impregnation treatment system can be simultaneously merged in the basalt fabrics to generate polycondensation to lay an adhesion foundation, for example, resorcinol and hexamethylenetetramine interact to enable the rubber and the basalt fabrics to form chemical bonding, so that the bonding strength is improved, the strip cutting, stacking and die pressing method is simple and convenient, and the method is suitable for preparing the screen plate with the basalt framework by rubber die pressing.
Further, the benzoxazine of the first step is B-m bisphenol A benzoxazine resin. The benzoxazine can improve the mixing manufacturability of the rubber material at the initial stage, so that the strength is improved, the heat resistance of the fluororubber is good, the benzoxazine curing temperature is higher, the fluororubber is not hard to cure, and the hydrogen halide in the vulcanization process of the fluororubber can catalyze benzoxazine crosslinking and is used together with the benzoxazine, so that the tear strength of the vulcanized fluororubber can be improved.
Further, the remilling process in the second step is that the rotation speed of a front roller is 27.5-28.5 rpm, the speed ratio of the front roller to the rear roller is 1: 1.15-1.28, the steam pressure is 0.4-0.5 MPa, the roller gap is 1-2 mm, the front roller is 55-60 ℃, the rear roller is 50-55 ℃, the thin passing is 10-12 times, the blanking and cooling are performed, the vulcanizing process is that flat plate vulcanization is performed for 50-60 min at 150-160 ℃ under 15-20 MPa, and the post-curing process is that vulcanization is performed for 12-16 h at 180-205 ℃ in an oven: the vulcanization of the fluororubber is carried out in two stages, wherein the first stage is used for shaping vulcanization products, and the second stage is used for supplementing and then curing.
In the benzoxazine curing process, hydrogen fluoride and hydrogen chloride separated out from fluororubber in the vulcanization process are neutralized, the vulcanization process is promoted, and the crosslinking density can be improved, so that the vulcanized rubber has better thermal stability.
The invention has the beneficial effects that:
firstly, the acid-absorbing agent of the prior fluororubber, including magnesium oxide and the like, is not used, but hydrogen halide released in the vulcanization process of the fluororubber is utilized, active hydrogen is utilized to carry out crosslinking reaction in the curing process of the benzoxazine resin to form chemical bonds so as to achieve the purpose of synchronous crosslinking, the brittleness of the benzoxazine resin is improved, the mechanical strength of the composite material is increased, the curing rate is improved so as to be beneficial to reducing the compression molding difficulty of the sieve plate, the impact toughness and cohesiveness of the benzoxazine resin are improved, the fluidity of the benzoxazine resin is improved, the advantages of the benzoxazine resin are still maintained, the heat resistance and the modulus are high, the toughness and the strength of the base sieve plate can be improved by introducing the benzoxazine resin, and after the sieve plate is subjected to external force, particularly to feeding impact and vibration jigging impact, deformation is generated, and a plurality of fine cracks are generated in the sieve plate, the rubber particles span the benzoxazine cracks with high strength, so that the continuous expansion of the cracks can be slowed down, the rubber particles also need to deform, energy is consumed, larger impact can be resisted, and the material is toughened and reinforced; the rubber-plastic toughening mechanism is that a rubber phase in the system continuously penetrates through a thermosetting resin benzoxazine network, after rubber toughening is carried out, external impact energy is mainly absorbed by formed silver lines by using a toughening system of a benzoxazine matrix, good toughness and low water absorption are kept in a cross-linked network, good strength is also kept, the benzoxazine also has good corrosion resistance, and the introduction of the benzoxazine does not cause great reduction of the corrosion resistance.
Compared with the prior art, the invention has the following advantages:
firstly, the acid-absorbing agent of the prior fluororubber, including magnesium oxide and the like, is not used in the invention, but hydrogen halide released in the vulcanization process of the fluororubber is utilized, active hydrogen is utilized to carry out crosslinking reaction in the curing process of the benzoxazine resin to form chemical bonds so as to achieve the purpose of synchronous crosslinking, the brittleness of the benzoxazine resin is improved, the mechanical strength of a composite material is increased, and the curing rate is improved so as to be beneficial to reducing the compression molding difficulty of the sieve plate, the sieve plate is prepared by calendering, laminating and stacking the fluororubber, and the basalt framework with high strength has excellent surface performance, toughness and compactness, strong permeation resistance, corrosion resistance to various chemicals, excellent water resistance, acid-base corrosion resistance, high modulus, good strength, high heat resistance, low shrinkage and better processing and use performance, and the produced sieve plate has high strength, rigidity and bearing capacity, the structure is firm, the anti-seismic tensile capacity is strong, the processing is convenient, the effective screening area is large, the filter screen is used for filtering and screening various media, the application fineness range is wide, and the maintenance is simple and convenient. The bearing has the advantages of high load bearing strength, high temperature resistance, corrosion resistance, good mechanical property, safety, reliability, mineral corrosion and high durability in a corrosive environment.
Detailed Description
The invention is illustrated by the following specific examples, which are not intended to be limiting.
Example 1
Wherein the basalt fabric DZXB-WFPM600 is composed of fluoridated graphene with fluorine content of 60%, particle size of D5050 μm and average lamella thickness of 5nm, viton A401C of fluororubber and WT95-45 of microlite ink powder.
Firstly, mixing and mixing a fluororubber mixture, namely, sequentially weighing 88phr of fluororubber, 13.5phr of accelerator DZ0.5phr of microlite ink powder and 0.7phr of fluorinated graphene in parts by weight, adding B-m bisphenol A benzoxazine resin into the fluororubber mixture in the open mixing process, after the open mixing is finished, mixing, wherein the mixing process comprises the steps of enabling the speed ratio of a quadrangular rotor to be 1:1.15, enabling the rotation speed to be 40rpm, enabling a top plug to have unit pressure on materials to be 0.2MPa, enabling the filling coefficient to be 0.55 and enabling internal mixing to be carried out for 10min, the open mixing process comprises the steps of sequentially adding fluororubber, graphene fluoride, microcrystalline graphite powder and an accelerator, uniformly mixing, adding benzoxazine AIBZ321 accounting for 25% of the mass of the fluororubber, enabling the rotation speed of a front roller to be 27.5rpm, enabling the speed ratio of a front roller to be 1.15, enabling the steam pressure to be 0.4MPa, enabling a roller gap to be 2mm, enabling the front roller to be 50 ℃, enabling a rear roller to be 45 ℃, carrying out thin pass for 8 times, enabling the open mixing to be carried out for 10min, blanking and cooling to 25 ℃ to obtain a rubber-plastic premix; secondly, the back-smelting process is that the rotation speed of a front roller is 27.5rpm, the speed ratio of the front roller to the back roller is 1.15, the steam pressure is 0.4MPa, the roller gap is 1mm, the front roller is 55 ℃, the back roller is 50 ℃, the thin-pass is carried out for 10 times, the blanking and the cooling are carried out, the vulcanizing process is that the flat plate vulcanization is carried out under 15MPa for 50min under 150 ℃, the post-curing process is carried out in an oven for 12h under 180 ℃, the rubber and plastic premix is pressed into an extruder screw rod through a material pressing device after being back-smelted, the screw rod continuously conveys the material forwards, the material is filtered by a machine head to remove impurities, and the material is extruded into a sheet material, and the material is conveyed to a calender through a conveyor belt. To prevent metal from being incorporated into the material and damaging the surface of the roll, the sheet material is passed through a metal detector before entering the calender. The diameter of the screw is 250mm, the length-diameter ratio L/D is 6: 1, the compression ratio is 2, the temperature of a machine barrel is 50 ℃, the temperature of a machine neck is 50 ℃, the temperature of a machine head is 50 ℃, and the rolling pressure is 3 MPa. Pressing a delayed lower roller at 50 ℃, controlling the temperature of a middle roller at 60 ℃, controlling the temperature of an upper roller at 80 ℃, extruding and rolling the two surfaces of the delayed lower roller into sheets, adding a vulcanizing agent in a remilling process, wherein the vulcanizing agent is N, N-bis-cinnamyl-1, 6-hexamethylene diamine with the mass of 0.5 percent of fluororubber to obtain the rolled rubber sheets, the rolled base cloth is basalt base cloth, the basalt base cloth is a four-axis warp-knitted basalt fabric impregnated with the mixture of a phenol activating agent and an amine crosslinking agent in the mass ratio of 1:1.15, the impregnation content is 8 percent, the layering structure of yarn bundles is 90 DEG/45 DEG/0 DEG/45 DEG, the yarn bundles are basalt fiber untwisted rovings, the diameter of the basalt fiber is 13 mu m, the phenol activating agent is a binder RS, and the amine crosslinking agent is hexamethoxymethylmelamine; and then cutting the rolled rubber sheets into strips, uniformly stacking and filling according to a sieve plate mold, carrying out compression molding, vulcanization and post curing on 2 layers of fabrics, wherein the sieve holes have the size of 12mm multiplied by 12mm and the external dimension of 2000mm multiplied by 1200mm multiplied by 20mm, and thus obtaining the corrosion-resistant rubber mould pressing sieve plate.
Wherein the tensile strength of the product rubber compound is 42.27MPa, the hardness is 82.6 Shore A, and the elongation is 281.5%; the tensile strength retention rate of 144H at 70 ℃ of 36.5% hydrochloric acid with soaking corrosivity is 85.8%, the volume expansion rate is 3.2%, the tensile strength retention rate of 365d at 35 ℃ of 36.5% hydrochloric acid is 73.6%, the volume expansion rate is 4.4%, the tensile strength retention rate of 144H of sodium hydroxide with mass fraction of 45% is 77.5%, the volume expansion rate is 2.0%, the abrasion loss of Taber (Taber) is 0.102g (100 g, H-22, 1000 revolutions).
Example 2
Wherein, the fluorine rubber Viton A402C, the basalt fabric DZXB-WFPM600 stone gold, the fluorine content is 60%, the particle diameter is D5060 μm, the fluorinated graphene with the average lamella thickness of 10nm, and the microlite ink powder WT 92-75.
Firstly, mixing and mixing a fluororubber mixture, namely weighing 99phr of fluororubber, 1phr of an accelerator CZ, 14.8phr of microlite ink powder and 0.98phr of graphene fluoride in sequence, adding B-m bisphenol A benzoxazine resin AIBZ321 into the fluororubber mixture in an open milling process, and milling after the open milling is finished, wherein the mixing process comprises the steps of enabling the speed ratio of a square rotor to be 1: 1.18, enabling the rotation speed to be 80rpm, enabling the unit pressure of a top bolt to the materials to be 0.45MPa, enabling the filling coefficient to be 0.80 and enabling the mixing time to be 15min, enabling the fluororubber, the graphene fluoride, the microcrystalline graphite powder and the accelerator to be added in a feeding sequence after the mixing is uniform, enabling benzoxazine with the mass of 30% of the fluororubber to be added in a front roller rotation speed of 28.5rpm, enabling the front-back roller speed ratio to be 1.28, enabling the steam pressure to be 0.5MPa, enabling a roller gap to be 3mm, a front roller 55 ℃, enabling the rear roller to be 50 ℃ and thin pass to be carried out for 10 times, enabling the open milling time to be 15min, and cooling to be 30 ℃ to obtain a premix; and secondly, the back-refining process comprises the steps of rotating the front roller at 28.5rpm, enabling the speed ratio of the front roller to the back roller to be 1.28, enabling the steam pressure to be 0.5MPa, enabling the roller gap to be 2mm, enabling the front roller to be 60 ℃, enabling the back roller to be 55 ℃ and carrying out thin pass for 12 times, blanking and cooling, vulcanizing the rubber and plastic premix at 205 ℃ in an oven for 60min at 160 ℃, carrying out back curing for 16h at 205 ℃, carrying out back refining on the rubber and plastic premix, carrying out double-sided extrusion and calendering to obtain a sheet, adding hexamethylene diamine carbonate with the mass of 1% of that of the vulcanizing agent-fluororubber in the back refining process, pressing the mixture into a screw rod of an extruder through a material pressing device, continuously conveying the material forward by the screw rod, filtering the mixture through a machine head to remove impurities, extruding the sheet material, and conveying the sheet material into a calender through a conveyor belt. In order to prevent the surface of the roller from being damaged by metal mixed into the material, the metal detector detects the metal before the metal enters the calender, wherein the screw diameter of the extruder is 250mm, the length-diameter ratio L/D6: 1, the compression ratio is 2, the temperature of a machine barrel is 60 ℃, the temperature of a machine neck is 60 ℃, the temperature of a machine head is 60 ℃, and the calendering pressure is 3 MPa. Pressing the lower delay roller by 50 ℃, controlling the temperature of the middle roller at 60 ℃, controlling the temperature of the upper roller at 80 ℃ to obtain a rolled rubber sheet, wherein the rolled base cloth is basalt base cloth, the basalt base cloth is a quadriaxial warp-knitted basalt fabric impregnated by a mixture of a phenolic activator and an amine cross-linking agent in a mass ratio of 1:1.15, the impregnation content is 10%, the layering structure of yarn bundles is 90 °/45 °/0 °/45 °, the yarn bundles are basalt fiber untwisted rovings, the diameter of basalt fiber precursor is 9 μm, the phenolic activator is an adhesive RE, and the amine cross-linking agent is an adhesive H-80; thirdly, cutting the rolled rubber sheets into strips, uniformly stacking and filling the strips according to a sieve plate mold, then carrying out compression molding, vulcanization and post curing on 2 layers of fabrics, wherein the sieve holes have the size of 12mm multiplied by 12mm and the external dimension of 2000mm multiplied by 1200mm multiplied by 20mm, and thus obtaining the corrosion-resistant rubber mould pressing sieve plate.
Wherein the tensile strength of the product rubber is 45.63MPa, the hardness is 86.3 Shore A, and the elongation is 273.4%; the tensile strength retention rate of 144H at 70 ℃ of 36.5% hydrochloric acid with soaking corrosivity is 85.6%, the volume expansion rate is 3.3%, the tensile strength retention rate of 365d at 35 ℃ of 36.5% hydrochloric acid is 73.8%, the volume expansion rate is 4.5%, the tensile strength retention rate of 144H of sodium hydroxide with mass fraction of 45% is 77.6%, the volume expansion rate is 1.9%, the abrasion loss of Taber (Taber) is 0.101g (100 g, H-22, 1000 revolutions).
Secondly, the screen needs to have a certain mechanical strength to be used as a screenScreen use by design of orthogonal experiment L9（34) Analyzing the rubber strength difference under the influence of different factors to find a sieve plate proportion with better strength and good corrosion resistance, wherein the fluororubber accounts for the most, so the factor A is the fluororubber, and the corresponding levels are 10 parts, 11 parts and 12 parts in sequence; the factor B is benzoxazine, and the corresponding levels are 1 part, 2 parts and 3 parts in sequence; the factor C is microcrystalline graphite powder, and the corresponding levels are 0.5 part, 1 part and 1.5 parts in sequence; the factor D is fluorinated graphene, and the factor D is respectively 0.1 part, 0.15 part and 0.2 part correspondingly; prepared according to the process of example 2, except that the corrosion-resistant screen deck sizing composition ratios were different, the results are shown in table 1.
Table 1 results of orthogonal test performance test of corrosion-resistant screen plate compound according to the method of reference example 2
| Serial number | Fluororubber | Benzoxazines as herbicides | Microcrystalline graphite powder | Fluorinated graphene | Tensile strength MPa |
| 1 | 10 | 1 | 0.5 | 0.1 | 38.86 |
| 2 | 10 | 1 | 0.5 | 0.1 | 36.37 |
| 3 | 10 | 1 | 0.5 | 0.1 | 43.02 |
| 4 | 11 | 2 | 1 | 0.15 | 34.72 |
| 5 | 11 | 2 | 1 | 0.15 | 37.06 |
| 6 | 11 | 2 | 1 | 0.15 | 38.49 |
| 7 | 12 | 3 | 1.5 | 0.2 | 36.39 |
| 8 | 12 | 3 | 1.5 | 0.2 | 33.04 |
| 9 | 12 | 3 | 1.5 | 0.2 | 44.12 |
| K1 | 118.257 | 109.978 | 110.391 | 120.048 | - |
| K2 | 110.277 | 106.471 | 115.216 | 111.255 | - |
| K3 | 113.551 | 125.636 | 116.478 | 110.781 | - |
| k1 | 39.419 | 36.659 | 36.797 | 40.016 | - |
| k2 | 36.759 | 35.490 | 38.405 | 37.085 | - |
| k3 | 37.850 | 41.879 | 38.826 | 36.927 | - |
| R | 2.660 | 5.219 | 0.421 | 0.158 | - |
As can be seen, B > A > D > C, preferably formula A1B3C3D1The proportion of the mixed rubber material of the fluororubber in the third step of the example 2 is similar to that of the mixed rubber material of the fluororubber, while the tensile strength of the example 2 is 45.63MPa, so that the strength requirement of the polyurethane sieve plate can be met.
Note: and the rubber performance requirement in the GB/T33091-2016 polyurethane sieve plate is referred to for detection.
Claims (6)
1. The production method of the corrosion-resistant rubber molded sieve plate is characterized by comprising the following steps of: firstly, adding benzoxazine into a fluororubber mixed sizing material in an open mixing process, and mixing after the open mixing is finished to obtain a rubber-plastic premix; secondly, back-smelting the rubber-plastic pre-mixture, extruding and rolling the two sides of the rubber-plastic pre-mixture into sheets, and adding a vulcanizing agent in the back-smelting process to obtain rolled rubber sheets, wherein the rolled base cloth is basalt base cloth; and thirdly, cutting the rolled rubber sheets into strips, uniformly stacking and filling according to the sieve plate mold, and then carrying out compression molding, vulcanization and post curing to obtain the corrosion-resistant rubber molded sieve plate.
2. The method for producing a corrosion-resistant rubber molded screen deck according to claim 1, wherein the step dibenzooxazine is B-m bisphenol a benzoxazine resin.
3. The production method of the corrosion-resistant rubber molded sieve plate according to claim 1, wherein the fluororubber mixed and mixed rubber material in the first step is obtained by sequentially weighing 88-99 phr of fluororubber, 0.5-1 phr of accelerator, 13.5-14.8 phr of microlite toner and 0.7-0.98 phr of graphene fluoride, wherein the accelerator is one of accelerator DZ and accelerator CZ.
4. The production method of the corrosion-resistant rubber mold pressing sieve plate according to claim 1, wherein the mixing process in the first step is that the speed ratio of a quadrangular rotor is 1: 1.15-1: 1.18, the rotating speed is 40-80 rpm, the unit pressure of a top plug to a material is 0.2-0.45 MPa, the filling coefficient is 0.55-0.80, and the banburying time is 10-15 min, the open mixing process comprises the steps of feeding fluororubber, fluorinated graphene, microcrystalline graphite powder and an accelerator in sequence, uniformly mixing, then adding benzoxazine with the mass of 25-30% of the fluororubber, rotating speed of a front roller is 27.5-28.5 rpm, the speed ratio of a front roller to a rear roller is 1: 1.15-1.28, steam pressure is 0.4-0.5 MPa, the gap between rollers is 2-3 mm, the temperature of the front roller is 50-55 ℃, the rear roller is 45-50 ℃, thinly passing is 8-10 times, the open mixing time is 10-15 min, and blanking and cooling are carried out.
5. The production method of the corrosion-resistant rubber molded sieve plate according to claim 1, wherein the basalt base cloth in the second step is a quadriaxial warp-knitted basalt fabric impregnated with a mixture of a phenolic activator and an amine cross-linking agent in a mass ratio of 1:1.15, wherein the impregnation content is 8-10%, the ply structure of yarn bundles is 90 °/45 °/0 °/45 °, the yarn bundles are basalt fiber untwisted rovings, the diameter of basalt fiber precursor is 9-13 μm, the phenolic activator is one or more of a binder RS or a binder RE, and the amine cross-linking agent is one or more of hexamethoxymethylmelamine or a binder H-80.
6. The production method of the corrosion-resistant rubber molded sieve plate according to claim 1, wherein the remixing process in the second step is that the rotation speed of a front roller is 27.5-28.5 rpm, the speed ratio of the front roller to the rear roller is 1: 1.15-1.28, the steam pressure is 0.4-0.5 MPa, the roller gap is 1-2 mm, the front roller is 55-60 ℃, the rear roller is 50-55 ℃, the thin passing is performed for 10-12 times, the blanking and the cooling are performed, the vulcanizing process is that a flat plate is vulcanized for 50-60 min at 150-160 ℃ under 15-20 MPa, the post-curing process is that the vulcanizing process is performed for 12-16 h at 180-205 ℃ in an oven, and the vulcanizing agent is one of N, N-bis-cinnamylidene-1, 6-hexanediamine or hexanediamine carbonate with the mass of 0.5% -1% of fluororubber.
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