CN112608573A - Anti-deviation wear-resistant sealing ring material and preparation method thereof - Google Patents
Anti-deviation wear-resistant sealing ring material and preparation method thereof Download PDFInfo
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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
- C08L27/18—Homopolymers or copolymers or tetrafluoroethene
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- 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
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Abstract
The invention discloses an anti-shifting wear-resistant sealing ring material and a preparation method thereof, wherein the sealing ring material comprises the following components in percentage by mass: organic filler: 10% -30%; inorganic fibers and inorganic powder fillers: 0% -20%; PTFE: 50 to 80 percent. The preparation method of the invention improves the compression strength of the material, improves the service temperature of the product, simultaneously has smaller overall friction coefficient and grinding crack width of the formula, and improves the service quality and the service life of the product. The improvement of the compression strength of the product increases the compression resistance and deformation resistance of the product. The product temperature is increased and the Vicat softening temperature is increased due to heat generated by relative movement of the product and the grinding part in high-speed friction, and the deformation resistance and the pressure resistance of the product at high temperature are improved. The friction coefficient is small, so that the increase of friction heat can be reduced, the motion of the moving and static rotors is relatively stable, and the play is reduced. The small width of the grinding crack can improve the service life of the product.
Description
Technical Field
The invention belongs to the field of composite materials, and particularly relates to an anti-offset wear-resistant sealing ring material for sealing a rotary vane compressor and a valve and a preparation method thereof.
Background
Inorganic modifier and fiber materials are usually added into PTFE base materials on the market at present, but the fiber materials (carbon fibers, glass fibers and the like) are modified and are not uniformly dispersed, and the phenomenon of fatigue breakage and accelerated wear can occur in some high-speed and high-load motions mainly because the fiber materials have a certain length-diameter ratio and still have a stress concentration phenomenon. Meanwhile, the PTFE base material has low strength, so that the bearing capacity is limited, and the softening temperature of the PTFE base material is low, so that the PTFE base material does not flow due to high viscosity during high-temperature plasticization, and therefore, the problem of how to improve the bearing capacity and the wear resistance of the PTFE base material is the problem which needs to be solved urgently at present.
The rotary vane compressor has relative motion between the rotor and the stator in the operation process, the rotor and the rotor are made of metal or alloy materials generally, and the sealing ring is used for preventing the rotor and the stator from shifting and wearing due to long-time motion friction, so that the defects of abnormal sound, low efficiency, short service life and the like of the compressor are caused.
In view of the above, how to manufacture a seal ring material with offset prevention and wear resistance from a PTFE base material is a subject to be studied.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an anti-shifting wear-resistant sealing ring material and a preparation method thereof aiming at the defects of the prior art, and the sealing ring has the advantages of wear resistance, small deformation after use, long service life and the like, so that the rotor of the rotor moves relatively stably, and the play is reduced.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
the anti-shifting wear-resistant sealing ring material comprises the following components in percentage by mass:
organic filler: 10% -30%;
inorganic fibers and inorganic powder fillers: 10% -20%;
PTFE：50％-80％。
as a further improved technical scheme of the invention, the organic filler comprises PI, PEEK and PPS.
As a further improved technical scheme of the invention, the particle size of the organic filler is 20-80 μm, and the apparent density is 800-1000 g/L.
As a further improved technical scheme of the invention, the inorganic fiber and inorganic powder filler comprises CF, GF, carbon powder, graphite, molybdenum disulfide and floating beads.
As a further improved technical scheme of the invention, the PTFE is polytetrafluoroethylene suspension fine powder, the particle size is 25-40 μm, and the apparent density is 400-500 g/L.
In order to achieve the technical purpose, the invention adopts another technical scheme as follows:
a preparation method of an anti-shifting wear-resistant sealing ring material comprises the following steps:
(1) blending PTFE powder, organic filler, inorganic fiber and inorganic powder filler, and obtaining blended powder by a dry method or obtaining a free-flowing material by wet granulation after blending;
(2) adding the blended powder or the free-flowing material into an annular cavity, and carrying out direct pressing or floating pressurization on the blended powder or the free-flowing material to obtain an annular blank with strength;
(3) sintering the blank;
(4) and machining the annular blank to obtain the required annular sealing ring product with a step and a lip structure.
As a further technical scheme of the invention, the preparation method specifically comprises the following steps:
(1) blending PTFE powder, organic filler, inorganic fiber and inorganic powder filler by using high-speed blade mixing equipment, three-dimensional mixing equipment or hammer mill mixing equipment, keeping the temperature of the mixture not to be too high, keeping the temperature of the mixture at 15-30 ℃ conventionally, stirring at 500-1500 rpm by using the high-speed blade mixing equipment, the three-dimensional mixing equipment or the hammer mill mixing equipment for 5-30 min after adding, and obtaining blended powder by using a dry method or obtaining a free flowing material by using wet granulation after mixing;
(2) adding the blended powder or the free-flowing material into an annular cavity, using a one-way press or a two-way press, and carrying out cold pressing on the blended powder or the free-flowing material in a direct pressing or floating pressing mode, wherein the pressure maintaining pressure is 20-70 MPa, and the pressure maintaining time is more than 30s, so as to obtain an annular blank with strength;
(3) placing the blank in a sintering furnace, controlling a sintering temperature curve of the sintering furnace by using a microcomputer, heating from room temperature to 360-400 ℃, wherein the heating speed is 2-10 ℃/min, the sintering temperature is 360-400 ℃, the heat preservation time is not less than 4h, cooling after heat preservation is finished, the cooling speed is 2-10 ℃, cooling to 280-320 ℃, continuing to preserve heat, the heat preservation time is not less than 2h, continuing to cool to room temperature, and taking out the sintered annular blank;
(4) machining the annular blank in a constant temperature environment to obtain the required annular sealing ring product with a step and lip structure
The invention has the beneficial effects that:
the product (namely the sealing ring) needs to bear pressure in the working process, plays a role in sealing between the rotor and the stator of the high-speed compressor in a groove made of hard material, and simultaneously prevents the play. The formula prepared by the invention improves the compression strength of the material, improves the service temperature of the product, has small overall friction coefficient and small abrasion mark width, improves the service quality and prolongs the service life of the product, and has good effect in the sealing of a high-load compressor. The increase in the compressive strength of the product may increase the compression and deformation resistance of the product. The product temperature is increased and the Vicat softening temperature is increased due to heat generated by relative movement of the product and the grinding part in high-speed friction, and the deformation resistance and the pressure resistance of the product at high temperature are improved. The friction coefficient is small, so that the increase of friction heat can be reduced, the motion of the moving and static rotors is relatively stable, and the play is reduced. The small width of the grinding crack can improve the service life of the product and reduce the abrasion sinking speed of the sealing step and the lip surface.
According to the invention, the organic fillers which have high softening temperature and can bear high load are filled in the PTFE base material, the organic fillers have further plasticizing deformation at high friction temperature, and the smooth surface of the plasticizing deformation is also beneficial to reducing the abrasion, so that the bearing capacity and the abrasion resistance of the PTFE base material are improved.
Compared with other systems in the application of actual working conditions, the invention has the following advantages:
compared with a sealing ring made of pure PTFE base material, the invention has the advantages of wear resistance, small deformation after use, long service life and the like.
Compared with a sealing ring made of PTFE (polytetrafluoroethylene) filling fibers, the sealing ring has the advantages of less cracking, small damage to a grinding part, no obvious depression, small friction coefficient and the like.
Compared with a sealing ring made of PTFE (polytetrafluoroethylene) filled organic material, the sealing ring has the advantages of less powder falling, no surface crack, good friction resistance, high temperature resistance, good wear resistance and the like, thereby ensuring the smoothness of the movement of fluid in a cavity in the operation process of compression equipment.
Detailed Description
The following further illustrates embodiments of the invention:
example 1:
a preparation method of an anti-shifting wear-resistant sealing ring material specifically comprises the following steps:
(1) using high-speed blade mixing equipment to blend 50% of PTFE powder, 30% of organic filler and 20% of inorganic fiber and inorganic powder filler (including 15% of inorganic fiber filler and 5% of inorganic powder filler), wherein the temperature of the mixture is 15 ℃, the rotating speed of the high-speed blade mixing equipment is 500rpm, stirring is carried out for 5min after adding, and after mixing, obtaining the blended powder by a dry method. Wherein the organic filler comprises PI, PEEK, PPS and the like, and the inorganic fiber and inorganic powder filler comprises CF, GF, carbon powder, graphite, molybdenum disulfide, floating beads and the like.
(2) Adding the blended powder into an annular cavity, using a one-way press, and carrying out cold pressing on the blended powder in a direct pressing mode, wherein the pressure maintaining pressure is 20MPa, and the pressure maintaining time is more than 30s, so that an annular blank with strength is obtained (the density is improved).
(3) Placing the blank in a rotatable sintering furnace with hot air circulation on a frame body, controlling a sintering temperature curve of the sintering furnace by using a microcomputer, raising the temperature from room temperature to 360 ℃, raising the temperature at a speed of 2 ℃/min, raising the sintering temperature to 360 ℃, keeping the temperature for 4h, cooling after the heat preservation is finished, lowering the temperature at a speed of 2 ℃, continuing to keep the temperature after the temperature is lowered to 280 ℃, keeping the temperature for 2h, then continuing to lower the temperature to room temperature, and taking out an annular blank after the sintering (the sintering curve can improve the sintering density and the crystallinity).
(4) And (3) machining the annular blank in a constant temperature environment to obtain an annular sealing ring product with a step and lip structure (ensuring that the product size and the fit clearance meet the requirements of assembly and thermal barrier cold shrinkage of a PTFE (polytetrafluoroethylene) base material product caused by later-stage temperature difference).
The performance of the prepared annular sealing ring product is tested, and the test result is shown in table 1.
Example 2:
a preparation method of an anti-shifting wear-resistant sealing ring material specifically comprises the following steps:
(1) using three-dimensional mixing equipment to blend 60% of PTFE powder, 25% of organic filler and 15% of inorganic fiber and inorganic powder filler (including 12% of inorganic fiber filler and 3% of inorganic powder filler), wherein the temperature of the mixture is 20 ℃, the rotating speed of the three-dimensional mixing equipment is 800rpm, stirring is carried out for 10min after adding, and after mixing, wet granulation is adopted to obtain the free flowing material. Wherein the organic filler comprises PI, PEEK, PPS and the like, and the inorganic fiber and inorganic powder filler comprises CF, GF, carbon powder, graphite, molybdenum disulfide, floating beads and the like.
(2) Adding the free-flowing material into an annular cavity, using a one-way press, and carrying out cold pressing on the free-flowing material in a direct pressing mode, wherein the pressure maintaining pressure is 40MPa, and the pressure maintaining time is more than 30s, so that an annular blank with strength is obtained (the density is improved).
(3) Placing the blank in a sintering furnace with a rotatable frame body and hot air circulation, controlling a sintering temperature curve of the sintering furnace by using a microcomputer, raising the temperature from room temperature to 370 ℃, wherein the temperature raising speed is 4 ℃/min, the sintering temperature is 370 ℃, the heat preservation time is 6h, after the heat preservation is finished, lowering the temperature at a speed of 4 ℃, continuing to preserve heat after lowering the temperature to 290 ℃, wherein the heat preservation time is 3h, then continuing to lower the temperature to room temperature, and taking out an annular blank which is finished by sintering (the sintering curve can improve the sintering density and the crystallinity).
(4) And (3) machining the annular blank in a constant temperature environment to obtain an annular sealing ring product with a step and lip structure (ensuring that the product size and the fit clearance meet the requirements of assembly and thermal barrier cold shrinkage of a PTFE (polytetrafluoroethylene) base material product caused by later-stage temperature difference).
The performance of the prepared annular sealing ring product is tested, and the test result is shown in table 1.
Example 3:
a preparation method of an anti-shifting wear-resistant sealing ring material specifically comprises the following steps:
(1) using a hammer mill mixing device to blend 70% of PTFE powder, 15% of organic filler and 15% of inorganic fiber and inorganic powder filler (including 10% of inorganic fiber filler and 5% of inorganic powder filler), wherein the temperature of the mixture is 22.5 ℃, the rotation speed of the hammer mill mixing device is 1000rpm, stirring is carried out for 12min after adding, and after mixing, wet granulation is adopted to obtain the free flowing material. Wherein the organic filler comprises PI, PEEK, PPS and the like, and the inorganic fiber and inorganic powder filler comprises CF, GF, carbon powder, graphite, molybdenum disulfide, floating beads and the like.
(2) Adding the free-flowing material into an annular cavity, using a two-way press, and carrying out cold pressing on the free-flowing material in a floating pressurization mode, wherein the pressure maintaining pressure is 45MPa, and the pressure maintaining time is more than 30s, so that an annular blank with strength is obtained (the density is improved).
(3) Placing the blank in a rotatable sintering furnace with hot air circulation on a frame body, controlling a sintering temperature curve of the sintering furnace by using a microcomputer, raising the temperature from room temperature to 380 ℃, raising the temperature at a speed of 6 ℃/min, raising the sintering temperature to 380 ℃, keeping the temperature for 8h, after the heat preservation is finished, lowering the temperature at a speed of 8 ℃, continuing to keep the temperature after the temperature is lowered to 300 ℃, keeping the temperature for 4h, then continuing to lower the temperature to room temperature, and taking out an annular blank after the sintering (the sintering curve can improve the sintering density and the crystallinity).
(4) And (3) machining the annular blank in a constant temperature environment to obtain an annular sealing ring product with a step and lip structure (ensuring that the product size and the fit clearance meet the requirements of assembly and thermal barrier cold shrinkage of a PTFE (polytetrafluoroethylene) base material product caused by later-stage temperature difference).
The performance of the prepared annular sealing ring product is tested, and the test result is shown in table 1.
Example 4:
a preparation method of an anti-shifting wear-resistant sealing ring material specifically comprises the following steps:
(1) using high-speed blade mixing equipment to blend 80% of PTFE powder, 10% of organic filler and 10% of inorganic fiber and inorganic powder filler (including 8% of inorganic fiber filler and 2% of inorganic powder filler), wherein the temperature of the mixture is 30 ℃, the rotating speed of the high-speed blade mixing equipment is 1500rpm, stirring is carried out for 30min after adding, and after mixing, wet granulation is adopted to obtain the free flowing material. Wherein the organic filler comprises PI, PEEK, PPS and the like, and the inorganic fiber and inorganic powder filler comprises CF, GF, carbon powder, graphite, molybdenum disulfide, floating beads and the like.
(2) Adding the free-flowing material into an annular cavity, using a bidirectional press, and carrying out cold pressing on the free-flowing material in a direct pressing mode, wherein the pressure maintaining pressure is 70MPa, and the pressure maintaining time is more than 30s, so that an annular blank with strength is obtained (the density is improved).
(3) Placing the blank in a rotatable sintering furnace with hot air circulation on a frame body, controlling a sintering temperature curve of the sintering furnace by using a microcomputer, raising the temperature from room temperature to 400 ℃, raising the temperature at 10 ℃/min, raising the sintering temperature to 400 ℃, keeping the temperature for 12h, cooling after the heat preservation is finished, lowering the temperature at a rate of 10 ℃, continuing to keep the temperature after the temperature is lowered to 320 ℃, keeping the temperature for 4h, then continuing to lower the temperature to room temperature, and taking out an annular blank after the sintering (the sintering curve can improve the sintering density and the crystallinity).
(4) And (3) machining the annular blank in a constant temperature environment to obtain an annular sealing ring product with a step and lip structure (ensuring that the product size and the fit clearance meet the requirements of assembly and thermal barrier cold shrinkage of a PTFE (polytetrafluoroethylene) base material product caused by later-stage temperature difference).
The performance of the prepared annular sealing ring product is tested, and the test result is shown in table 1.
Table 1, examples 1-4 seal ring performance testing:
| performance of | Example 1 | Example 2 | Example 3 | Example 4 |
| 25% strain compressive strength, MPa | 38 | 40 | 42 | 44 |
| Vicat softening temperature,. degree.C | 125 | 150 | 160 | 180 |
| Coefficient of friction | 0.16 | 0.19 | 0.20 | 0.28 |
| Width of grinding mark mm | 3.8 | 3.1 | 2.6 | 2.8 |
Remarking:
the seals made in the above examples all exhibited high compressive strength, whereas the 25% strain-compressive strength of the seal made from pure PTFE was 20MPa to 30 MPa. The vicat softening temperature of the sealing ring manufactured by the above embodiment is increased more, and the vicat softening temperature of the sealing ring manufactured by pure PTFE is 40 ℃ to 60 ℃. The dynamic friction coefficient of the seal rings produced in the above examples was similar to that of the seal rings produced from pure PTFE (PTFE is the material having the lowest dynamic friction coefficient among solid materials). The seal ring produced in the above example had a wear scar width smaller than that of a seal ring produced from pure PTFE (6 mm to 10mm for pure PTFE).
Compared with the type of products made of pure organic materials such as PI, PEEK and PPS, the product has good toughness and is not easy to break in the using process. Compared with other single-added fiber materials, the fiber-removing and pressure-uneven composite material has the advantages that fiber removal, pressure unevenness and the like do not occur in the using process of the product, the service life is longer, and the usable environment temperature is high.
The product needs to bear pressure in the working process, plays a role in sealing between the rotor and the stator of the high-speed compressor in the groove made of hard material, and simultaneously prevents the product from moving. The formula of the invention improves the compression strength of the material, improves the service temperature of the product, has smaller overall friction coefficient and grinding crack width, improves the service stability and the service life of the product, and has good effect in the sealing of a high-load compressor. The increased compressive strength of the product may increase the compression and deformation resistance of the product. The product temperature is increased and the Vicat softening temperature is increased due to heat generated by relative movement of the product and the grinding part in high-speed friction, and the deformation resistance and the pressure resistance of the product at high temperature are improved. The friction coefficient is small, so that the increase of friction heat can be reduced, the motion of the moving and static rotors is relatively stable, and the play is reduced. The small width of the grinding crack can improve the service life of the product.
The formula of the invention is compared with other systems in the application of actual working conditions:
compared with a sealing ring made of pure PTFE base material, the invention has the advantages of wear resistance, small deformation after use, long service life and the like.
Compared with a sealing ring made of PTFE (polytetrafluoroethylene) filling fibers, the sealing ring has the advantages of less cracking, small damage to a grinding part, no obvious depression, small friction coefficient and the like.
Compared with a sealing ring made of PTFE filled organic materials, the sealing ring has the advantages of less powder falling, no surface crack, good friction resistance, high temperature resistance, good wear resistance and the like.
The scope of the present invention includes, but is not limited to, the above embodiments, and the present invention is defined by the appended claims, and any alterations, modifications, and improvements that may occur to those skilled in the art are all within the scope of the present invention.
Claims (7)
1. The utility model provides a prevent aversion wear-resisting sealing washer material which characterized in that: the composite material comprises the following components in percentage by mass:
organic filler: 10% -30%;
inorganic fibers and inorganic powder fillers: 10% -20%;
PTFE：50％-80％。
2. the anti-shifting wear-resistant seal ring material as claimed in claim 1, wherein: the organic fillers include PI, PEEK, and PPS.
3. The anti-shifting wear-resistant seal ring material according to claim 2, wherein: the particle size of the organic filler is 20-80 μm, and the apparent density is 800-1000 g/L.
4. The anti-shifting wear-resistant seal ring material as claimed in claim 1, wherein: the inorganic fiber and inorganic powder filler comprises CF, GF, carbon powder, graphite, molybdenum disulfide and floating beads.
5. The anti-shifting wear-resistant seal ring material as claimed in claim 1, wherein: the PTFE is polytetrafluoroethylene suspension fine powder, the particle size is 25-40 mu m, and the apparent density is 400-500 g/L.
6. The preparation method of the anti-shifting wear-resistant sealing ring material according to any one of claims 1 to 5, characterized in that: the method comprises the following steps:
(1) blending PTFE powder, organic filler, inorganic fiber and inorganic powder filler, and obtaining blended powder by a dry method or obtaining a free-flowing material by wet granulation after blending;
(2) adding the blended powder or the free-flowing material into an annular cavity, and carrying out direct pressing or floating pressurization on the blended powder or the free-flowing material to obtain an annular blank with strength;
(3) sintering the blank;
(4) and machining the annular blank to obtain the required annular sealing ring product with a step and a lip structure.
7. The preparation method of the anti-shifting wear-resistant sealing ring material according to claim 6, characterized in that: the method specifically comprises the following steps:
(1) blending PTFE powder, organic filler, inorganic fiber and inorganic powder filler by using high-speed blade mixing equipment, three-dimensional mixing equipment or hammer mill mixing equipment, wherein the temperature of the mixed material is 15-30 ℃, the rotating speed of the high-speed blade mixing equipment, the three-dimensional mixing equipment or the hammer mill mixing equipment is 500-1500 rpm, stirring is carried out after adding, the stirring time is 5-30 min, and after mixing, dry method is adopted to obtain blended powder or wet method granulation is adopted to obtain free flowing material;
(2) adding the blended powder or the free-flowing material into an annular cavity, using a one-way press or a two-way press, and carrying out cold pressing on the blended powder or the free-flowing material in a direct pressing or floating pressing mode, wherein the pressure maintaining pressure is 20-70 MPa, and the pressure maintaining time is more than 30s, so as to obtain an annular blank with strength;
(3) placing the blank in a sintering furnace, controlling a sintering temperature curve of the sintering furnace by using a microcomputer, heating from room temperature to 360-400 ℃, wherein the heating speed is 2-10 ℃/min, the sintering temperature is 360-400 ℃, the heat preservation time is not less than 4h, cooling after heat preservation is finished, the cooling speed is 2-10 ℃, cooling to 280-320 ℃, continuing to preserve heat, the heat preservation time is not less than 2h, continuing to cool to room temperature, and taking out the sintered annular blank;
(4) and machining the annular blank in a constant temperature environment to obtain the required annular sealing ring product with a step and lip structure.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113183380A (en) * | 2021-05-22 | 2021-07-30 | 南京肯特复合材料股份有限公司 | Processing method of ceramic modified PTFE film for 5G high-frequency copper-clad plate |
| CN115975318A (en) * | 2023-03-20 | 2023-04-18 | 季华实验室 | A kind of low-wear self-lubricating material and preparation method thereof |
| CN116444917A (en) * | 2023-04-26 | 2023-07-18 | 沈阳工业大学 | Composite material for reciprocating compressor sealing ring and preparation method thereof |
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| CN116444917A (en) * | 2023-04-26 | 2023-07-18 | 沈阳工业大学 | Composite material for reciprocating compressor sealing ring and preparation method thereof |
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