CN113801466A - High-strength wear-resistant piston sealing body and preparation method thereof - Google Patents
High-strength wear-resistant piston sealing body and preparation method thereof Download PDFInfo
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- CN113801466A CN113801466A CN202111181997.1A CN202111181997A CN113801466A CN 113801466 A CN113801466 A CN 113801466A CN 202111181997 A CN202111181997 A CN 202111181997A CN 113801466 A CN113801466 A CN 113801466A
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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
- C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
- C08L75/04—Polyurethanes
- C08L75/08—Polyurethanes from polyethers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/14—Pistons, piston-rods or piston-rod connections
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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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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Abstract
The invention relates to the field of polymer materials, and relates to a high-strength wear-resistant piston sealing body and a preparation method thereof. In particular, the invention relates to a composition useful for preparing a piston seal, a piston seal prepared from the composition, and a method of preparing the piston seal. The piston sealing body can be used as a concrete piston sealing body for concrete pumping equipment.
Description
Technical Field
The invention relates to the field of polymer materials, in particular to a composition for preparing a piston sealing body, a piston sealing body prepared from the composition and a method for preparing the piston sealing body. The piston sealing body can be used as a concrete piston sealing body for concrete pumping equipment.
Background
The concrete piston is an important vulnerable part for concrete pumping equipment (such as a pump truck, a trailer pump and a vehicle-mounted pump), and plays a role in sealing a cavity and pushing concrete in the conveying process of the concrete. As the concrete conveying medium is hard, the components are complex, the pumping pressure is high, and the sealing performance requirement is high, the concrete piston is required to have good mechanical strength and wear resistance.
The existing concrete piston sealing body mainly comprises two materials, namely rubber material and polyurethane material. The rubber concrete piston is prepared by taking nitrile rubber as a main body, adding a reinforcing agent, an anti-aging agent, a vulcanizing agent and the like, mixing and hot-pressing. The polyurethane concrete piston is generally formed by casting a prepolymer, a chain extender and the like into a whole through a casting machine. The wear resistance and mechanical properties of nitrile rubber are far lower than those of polyurethane materials. Meanwhile, the working environment of the concrete piston is complex, the pumping pressure is high, the concrete piston reciprocates at high frequency, the working end face directly contacts with the concrete, and the surface and the lip of the concrete piston are easily cracked due to hard media. Along with the development of the economic society, the requirement on the concrete pumping height is continuously improved, and higher requirements are provided for the mechanical strength and the wear resistance of a concrete piston.
Disclosure of Invention
The invention aims to provide a high-strength wear-resistant polyurethane concrete piston, which solves the problems of low mechanical strength and high wear of the conventional polyurethane concrete piston and has good mechanical strength and wear resistance. The invention adds the specially treated wear-resistant filler into the polymer system to improve the mechanical strength and wear resistance of the concrete piston, thereby prolonging the service life and reducing the replacement frequency.
In one aspect, the present application provides a composition for preparing a piston seal, comprising the following components in parts by weight: 100 parts of polyurethane prepolymer, 10-15 parts of chain extender, 3-15 parts of surface silanized ultrahigh molecular weight polyethylene powder, 0.5-1 part of antioxidant and 2-5 parts of surface silanized aluminum oxide powder.
The prepolymer is a substance formed by primarily polymerizing the monomers, and can be used in occasions where the monomers are difficult to be completely polymerized into the polymer at one time or the polymer is prevented from generating cavities and cracks easily in processing and forming. The invention uses polyurethane prepolymer as the main material for preparing the piston sealing body.
Polyurethanes are known by their full name as polyurethanes, and are a generic name for polymers containing a certain amount of carbamate groups in the molecule. Polyurethanes can be prepared by the interaction of mono-or poly-organic isocyanic acids, such as Toluene Diisocyanate (TDI) or diphenylmethane diisocyanate (MDI), with polyol compounds, such as polyether polyols or polyester polyols, to form polymers having a backbone containing a plurality of repeating carbamate groups. The polyurethane prepolymer is a reactive semi-finished product obtained by controlling a certain proportion of reaction between polybasic organic isocyanic acid and polyalcohol.
In certain embodiments, the polyurethane prepolymer is polyether.
In certain embodiments, the polyurethane prepolymer is selected from one or both of LF M2050, LF M2032 types.
In certain embodiments, the polyurethane prepolymer has one or more of the following characteristics:
a free MDI content of less than 0.1 wt%, for example 0.01 wt% to 0.02 wt%, 0.02 wt% to 0.03 wt%, 0.03 wt% to 0.04 wt%, 0.04 wt% to 0.05 wt%, 0.05 wt% to 0.06 wt%, 0.06 wt% to 0.07 wt%, 0.07 wt% to 0.08 wt%, or 0.08 wt% to 0.09 wt%;
the isocyanate group (-NCO) content is 3.0% to 5.2%, for example, 3.0% to 3.5%, 3.5% to 4.0%, 4.0% to 4.5%, 4.5% to 5.0%, or 5.0% to 5.2%;
the viscosity is 120 to 500cps, such as 120 to 150cps, 150 to 200cps, 200 to 300cps, 300 to 400cps or 400 to 500 cps.
In the invention, the chain extender refers to a substance which can react with functional groups on a linear polymer chain to expand the molecular chain and increase the molecular weight, and is commonly used for improving the mechanical property and the process property of products such as polyurethane, polyester and the like. In certain embodiments, the chain extender used is an alcohol chain extender, such as an aromatic alcohol chain extender, for example, 1, 4-bis (2-hydroxyethoxy) benzene (HQEE).
In some embodiments, the particle size of the ultra-high molecular weight polyethylene powder used in the present invention is 30 to 50 μm, such as 30 to 35 μm, 35 to 40 μm, 40 to 45 μm, or 45 to 50 μm.
In some embodiments, the ultra-high molecular weight polyethylene powder used in the present invention has a molecular weight (e.g., viscosity average molecular weight) of 300 to 500 ten thousand, such as 300 to 400 ten thousand or 400 to 500 ten thousand.
In some embodiments, the alumina powder used in the present invention has a particle size of 3000 to 5000 mesh, such as 3000 to 4000 mesh or 4000 to 5000 mesh.
In certain embodiments, the antioxidant used in the present invention is a hindered phenolic antioxidant, such as for example, anti-1010.
In certain embodiments, the composition includes 10 to 11, 11 to 12, 12 to 13, 13 to 14, or 14 to 15 parts by weight of the chain extender.
In some embodiments, the composition comprises 3 to 4, 4 to 5, 5 to 6, 6 to 7, 7 to 8, 8 to 9, 9 to 10, 10 to 11, 11 to 12, 12 to 13, 13 to 14 or 14 to 15 parts by weight of the surface silanized ultrahigh molecular weight polyethylene powder.
In certain embodiments, the composition comprises, by weight, 0.5 to 0.6, 0.6 to 0.7, 0.7 to 0.8, 0.8 to 0.9, or 0.9 to 1 part of an antioxidant.
In certain embodiments, the composition comprises 2 to 3, 3 to 4, or 4 to 5 parts by weight of surface silanized alumina powder.
The surface silanized ultrahigh molecular weight polyethylene powder used in the invention can be prepared by a method comprising the following steps:
and 2, reacting the oxidized ultrahigh molecular weight polyethylene powder with a silane coupling agent.
The oxidation treatment of step 1 may be carried out in a solution containing potassium permanganate and nitric acid. In certain embodiments, the solution is a mixed solution of a saturated aqueous potassium permanganate solution and an aqueous nitric acid solution (e.g., 50% to 60% strength aqueous nitric acid). In certain embodiments, the oxidation treatment comprises the steps of: putting the ultra-high molecular weight polyethylene powder into a solution (such as a mixed solution of a saturated potassium permanganate aqueous solution and 50% nitric acid) containing potassium permanganate and nitric acid, heating (such as heating to 80-90 ℃) and stirring (such as stirring for 30-40 min), filtering to obtain powder, repeatedly washing with deionized water, filtering, and drying.
In step 2, the silylation reaction may use common silane coupling agents, such as silane coupling agent KH540, silane coupling agent KH550, silane coupling agent KH560, and silane coupling agent KH 570. In certain embodiments, the silane coupling agent used is the silane coupling agent KH 550. The weight of the silane coupling agent used can be 1-5% of the weight of the ultra-high molecular weight polyethylene powder.
The silylation reaction can be carried out under stirring (for example, at 1500 to 2000rpm) and heating (for example, at 70 to 80 ℃). In certain embodiments, the silylation treatment is performed in a high speed mixer.
In certain embodiments, the step of silylating comprises: and adding the oxidized ultrahigh molecular weight polyethylene powder into a high-speed mixer, adjusting the rotating speed to 1500rpm, adjusting the temperature to 70 ℃, and dropwise adding a silane coupling agent KH550 accounting for 1 percent of the weight of the powder for coupling treatment.
The surface silanized alumina powder used in the present invention can be prepared by a method comprising the steps of: the alumina powder is reacted with the silane coupling agent under stirring (for example, at 2000 to 3000rpm) and heating (for example, at 70 to 80 ℃). In certain embodiments, the steps are performed in a high speed mixer. The silylation reaction may use a common silane coupling agent, such as silane coupling agent KH540, silane coupling agent KH550, silane coupling agent KH560, silane coupling agent KH 570. In certain embodiments, the silane coupling agent used is the silane coupling agent KH 550. The weight of the silane coupling agent used can be 1-5% of the weight of the ultra-high molecular weight polyethylene powder.
In certain embodiments, the steps comprise: putting the alumina powder into a high-speed mixer, adjusting the rotating speed to 2000rpm, adjusting the temperature to 70 ℃, and dropwise adding a coupling agent KH550 accounting for 1% of the weight of the powder for coupling treatment.
In one aspect, the present application provides the use of the composition of any of the above for preparing a piston seal. In certain embodiments, the piston seal is a concrete piston seal.
In one aspect, the present application provides a piston seal cast from the composition of any of the above. In certain embodiments, the piston seal is a concrete piston seal.
The present application also provides a method of making the piston seal of the present invention comprising casting using the composition of any of the above.
In certain embodiments, the method comprises the steps of:
a) respectively weighing polyurethane prepolymer, chain extender, ultra-high molecular weight polyethylene powder, antioxidant and alumina powder according to the weight parts;
b) performing silanization treatment on the ultrahigh molecular weight polyethylene powder and the alumina powder;
c) adding a polyurethane prepolymer, ultra-high molecular weight polyethylene powder and alumina powder into a tank A of a casting machine, uniformly mixing, controlling the temperature at 95-100 ℃, and stirring at a medium speed of 650-900 rpm;
d) adding a chain extender into a tank B of the casting machine, controlling the temperature to be 118-122 ℃, adding an antioxidant after the chain extender is completely melted, and stirring at a high speed of 1000-2000 rpm;
e) cleaning the surface of a mold, spraying a release agent in the mold, and preheating in an oven at 110-125 ℃ for later use;
f) mixing the liquid in the tank A and the liquid in the tank B according to the control proportion of a casting machine, vacuumizing, keeping the temperature at 110-125 ℃, stirring at the rotating speed of 2500-3000 rpm for 1-2 min at a high speed, and casting into a mold;
g) placing the mold in an oven at 110-120 ℃, heating for 30-45 min, taking out and demolding;
h) putting the demoulded product into a drying oven at 110-120 ℃ again for secondary vulcanization, wherein the vulcanization time is 16-20 h;
i) and machining the blanks subjected to secondary vulcanization to obtain the piston sealing body.
In certain embodiments, the silanization treatment of the ultra-high molecular weight polyethylene powder and the alumina powder is performed according to the method described above.
The piston sealing body can be used as a high-strength wear-resistant concrete piston sealing body, has high mechanical strength and excellent wear resistance, and can greatly prolong the service life of a concrete piston. In certain embodiments, the piston seal has one or more of the following features:
the tensile strength is more than or equal to 53 MPa;
the elongation at break is more than or equal to 410 percent;
the tearing strength is more than or equal to 113 kN/m;
the Shore hardness is 94-95A;
the abrasion of Akron is less than or equal to 0.030cm3；
The service life is more than 410h (the service life is improved by more than 35 percent compared with that of a pure polyurethane concrete piston).
The performance of the piston seal can be tested using methods commonly used in the art. Exemplary detection criteria or methods are as follows:
| performance parameter | Reference standard or test method |
| Shore Hardness (HA) | GB/T 531.1 |
| Tensile Strength (MPa) | GB/T 528 |
| Elongation at Break (%) | GB/T 528 |
| Tear Strength (kN/m) | GB/T 529 |
| Akron abrasion (cm)3) | GB/T 1689 |
| Service life (h) | Installation verification |
Further, the present application also provides a piston comprising the piston seal body of the present invention. In certain embodiments, the piston is a concrete piston.
Further, the present application also provides a delivery cylinder comprising the piston seal or piston of the present invention.
Further, the present application also provides a concrete pumping apparatus (e.g., such as a pump truck, a trailer pump, a truck pump) comprising a piston seal, piston, or delivery cylinder of the present invention.
Fig. 1 and 2 exemplarily show the structure of the concrete piston sealing body of the present invention, fig. 1 is a cross-sectional schematic view, and fig. 2 is a cross-sectional partial schematic view of fig. 1.
The reference numerals in the figures denote:
1-included angle between inner ring of concrete piston lip and horizontal plane, 2-included angle between concrete piston lip and horizontal plane,
3-included angle between outer inclined plane of concrete piston lip and vertical direction, 4-friction surface of side edge of concrete piston,
5-concrete piston lubricating grease storage tank, 6-schematic diagram of ultra-high molecular weight polyethylene powder,
7-schematic representation of alumina powder.
In certain embodiments, the concrete piston seal body of the present invention has the following major dimensions:
the included angle between the lip inner ring and the horizontal plane is 45-65 degrees;
the included angle between the lip and the horizontal plane is 2-5 degrees;
the included angle between the outer inclined plane of the lip mouth and the vertical direction is 10-20 degrees;
the width of the side friction surface is 8-12 mm;
the lubricating grease storage groove is 2-4 mm deep.
Advantageous effects of the invention
The piston seal of the present invention has one or more of the following benefits:
1. the piston sealing body has the advantages of simple production process, easiness in processing, low cost and stable quality;
2. the piston sealing body adopts a special filler treatment process, so that the ultra-high molecular weight polyethylene powder and the alumina powder are tightly combined with the polyurethane matrix and are uniformly dispersed;
3. the enhanced antifriction particles of the piston sealing body are uniformly distributed, and the wear resistance is improved;
4. the piston sealing body has excellent mechanical property and meets the concrete pumping working condition under the high pressure condition.
Drawings
FIG. 1 is a schematic cross-sectional view of a concrete piston seal body according to the present invention, wherein the reference numerals indicate:
1-included angle between inner ring of concrete piston lip and horizontal plane, 2-included angle between concrete piston lip and horizontal plane,
3-included angle between outer inclined plane of concrete piston lip and vertical direction, 4-friction surface of side edge of concrete piston,
5-a concrete piston lubricating grease storage tank.
FIG. 2 is a schematic partial cross-sectional view of FIG. 1, wherein the reference numerals indicate:
5-concrete piston lubricating grease storage tank, 6-schematic diagram of ultra-high molecular weight polyethylene powder,
7-schematic representation of alumina powder.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.
Example 1
(1) Taking 750g of ultra-high molecular weight polyethylene powder, putting the ultra-high molecular weight polyethylene powder into a mixed solution of a saturated potassium permanganate solution and 50% concentration nitric acid, heating to 80 ℃, stirring for 30min, filtering to obtain powder, and then repeatedly washing and filtering with deionized water. Drying, adding into a high-speed mixer, adjusting the rotation speed to 1500rpm, adjusting the temperature to 70 ℃, and dropwise adding 7.5 g of coupling agent KH550 for coupling treatment for later use;
(2) putting 500g of alumina powder into a high-speed mixer, adjusting the rotating speed to 2000rpm, adjusting the temperature to 70 ℃, and dropwise adding 5g of coupling agent KH550 for coupling treatment for later use;
(3) 25000g of prepolymer is added into a tank A of a casting machine, the temperature is controlled at 95 ℃, 750g of ultra-high molecular weight polyethylene powder subjected to surface treatment and 500g of alumina powder are uniformly mixed into the prepolymer, and the mixture is stirred at a low speed of 800 rpm;
(4) adding 2500g of chain extender into a casting machine B tank, heating to 110 ℃, adding 125g of antioxidant after the chain extender is completely melted, and stirring at a high speed of 1500 rpm;
(5) cleaning a mold cavity, uniformly spraying a release agent in the mold, and preheating in a 120 ℃ oven for later use;
(6) mixing the liquids in the tank A and the tank B, vacuumizing, keeping the temperature at 120 ℃, stirring at the rotating speed of 2500rpm for 1min, and pouring into a mold cavity;
(7) placing the mold in a drying oven at 110 ℃, heating for 30min, taking out and demolding;
(8) putting the demoulded product blank into a 110 ℃ oven again for secondary vulcanization, wherein the vulcanization time is 16 h;
(9) and machining the product blank after secondary vulcanization to obtain the high-strength wear-resistant polyurethane concrete piston.
Example 2
(1) 1250g of ultra-high molecular weight polyethylene powder is put into a mixed solution of saturated potassium permanganate solution and 50 percent nitric acid, heated to 80 ℃, stirred for 30min, filtered to obtain powder, and then repeatedly washed and filtered by deionized water. After drying, adding the mixture into a high-speed mixer, adjusting the rotating speed to 1500rpm, adjusting the temperature to 70 ℃, and dropwise adding 12.5 g of a coupling agent KH550 for coupling treatment for later use;
(2) adding 750g of alumina powder into a high-speed mixer, adjusting the rotating speed to 2000rpm, adjusting the temperature to 70 ℃, and dropwise adding 7.5 g of a coupling agent KH550 for coupling treatment for later use;
(3) 25000g of prepolymer is added into a tank A of a casting machine, the temperature is controlled at 95 ℃, 1250g of ultra-high molecular weight polyethylene powder subjected to surface treatment and 750g of alumina powder are uniformly mixed into the prepolymer, and the mixture is stirred at a low speed of 800 rpm;
(4) adding 2500g of chain extender into a casting machine B tank, adding 125g of antioxidant after the chain extender is completely melted, and stirring at a high speed of 1500 rpm;
(5) cleaning a mold cavity, uniformly spraying a release agent in the mold, and preheating in a 120 ℃ oven for later use;
(6) mixing the liquids in the tank A and the tank B, vacuumizing, keeping the temperature at 120 ℃, stirring at the rotating speed of 2500rpm for 1min, and pouring into a mold cavity;
(7) placing the mold in a drying oven at 110 ℃, heating for 30min, taking out and demolding;
(8) putting the demoulded product blank into a 110 ℃ oven again for secondary vulcanization, wherein the vulcanization time is 16 h;
(9) and machining the product blank after secondary vulcanization to obtain the high-strength wear-resistant polyurethane concrete piston.
Comparative example 1
(1) 25000g of prepolymer is added into a tank A of a casting machine, the temperature is controlled at 95 ℃, and the mixture is stirred at a medium-low speed of 800 rpm;
(2) adding 2500g of chain extender into a casting machine B tank, and stirring at a high speed of 1500rpm after the chain extender is completely melted;
(3) cleaning a mold cavity, uniformly spraying a release agent in the mold, and preheating in a 120 ℃ oven for later use;
(4) mixing the liquids in the tank A and the tank B, vacuumizing, keeping the temperature at 120 ℃, stirring at the rotating speed of 2500rpm for 1min, and pouring into a mold cavity;
(5) placing the mold in a drying oven at 110 ℃, heating for 30min, taking out and demolding;
(6) putting the demoulded product blank into a 110 ℃ oven again for secondary vulcanization, wherein the vulcanization time is 16 h;
(7) and machining the demoulded product to obtain the pure polyurethane concrete piston.
The mechanical properties, the wear resistance and the service time of the concrete piston sealing bodies prepared in the examples 1 and 2 and the comparative example are tested, and the results are shown in the table 1:
TABLE 1 Performance test results of concrete pistons prepared according to examples and comparative examples of the present invention
While specific embodiments of the invention have been described in detail, those skilled in the art will understand that: various modifications and changes in detail can be made in light of the overall teachings of the disclosure, and such changes are intended to be within the scope of the present invention. The full scope of the invention is given by the appended claims and any equivalents thereof.
Claims (11)
1. The composition for preparing the piston sealing body comprises the following components in parts by weight: 100 parts of polyurethane prepolymer, 10-15 parts of chain extender, 3-15 parts of surface silanized ultrahigh molecular weight polyethylene powder, 0.5-1 part of antioxidant and 2-5 parts of surface silanized aluminum oxide powder;
preferably, the particle size of the ultra-high molecular weight polyethylene powder is 30-50 μm;
preferably, the molecular weight of the ultra-high molecular weight polyethylene powder is 300-500 ten thousand.
2. The composition of claim 1, the polyurethane prepolymer is polyether;
preferably, the polyurethane prepolymer is selected from one or two of LF M2050 models and LF M2032 models;
preferably, the polyurethane prepolymer has one or more of the following characteristics:
(1) the free MDI content is less than 0.1 wt%,
(2) the content of isocyanate group (-NCO) is 3.0 percent to 5.2 percent,
(3) the viscosity is 120 to 500 cps.
3. The composition of claim 1 or 2, the surface silanized ultra high molecular weight polyethylene powder being prepared by a process comprising the steps of:
step 1, carrying out oxidation treatment on ultra-high molecular weight polyethylene powder;
step 2, reacting the oxidized ultrahigh molecular weight polyethylene powder with a silane coupling agent;
preferably, the oxidation treatment of step 1 is carried out in a solution containing potassium permanganate and nitric acid;
preferably, the solution is a mixed solution of a saturated aqueous potassium permanganate solution and an aqueous nitric acid solution (for example, a 50-60% concentration aqueous nitric acid solution);
preferably, step 1 comprises: putting the ultra-high molecular weight polyethylene powder into a solution containing potassium permanganate and nitric acid, heating and stirring, filtering to obtain powder, repeatedly cleaning with deionized water, filtering, and drying.
Preferably, the silane coupling agent is selected from: a silane coupling agent KH540, a silane coupling agent KH550, a silane coupling agent KH560, and a silane coupling agent KH 570;
preferably, the weight of the silane coupling agent is 1-5% of the weight of the ultra-high molecular weight polyethylene powder.
4. The composition of any one of claims 1-3, the surface silanized alumina powder prepared by a process comprising the steps of: under the conditions of stirring and heating, reacting the alumina powder with a silane coupling agent;
preferably, the silane coupling agent is selected from: a silane coupling agent KH540, a silane coupling agent KH550, a silane coupling agent KH560, and a silane coupling agent KH 570;
preferably, the weight of the silane coupling agent is 1 to 5 percent of the weight of the alumina powder.
5. The composition of any one of claims 1 to 4 having one or more of the following characteristics:
(1) the chain extender is an alcohol chain extender, such as an aromatic alcohol chain extender, for example, 1, 4-bis (2-hydroxyethoxy) benzene.
(2) The antioxidant is a hindered phenolic antioxidant, such as anti-1010;
(3) the particle size of the alumina powder is 3000-5000 meshes.
6. Use of a composition according to any one of claims 1 to 5 for the preparation of a piston seal;
preferably, the piston sealing body is a concrete piston sealing body.
7. A piston seal prepared by casting the composition according to any one of claims 1 to 5;
preferably, the piston sealing body is a concrete piston sealing body;
preferably, the piston seal has one or more of the following features:
the tensile strength is more than or equal to 53 MPa;
the elongation at break is more than or equal to 410 percent;
the tearing strength is more than or equal to 113 kN/m;
the Shore hardness is 94-95A;
the abrasion of Akron is less than or equal to 0.030cm3；
The service life is more than 410 h.
8. A method of making a piston seal comprising casting using the composition of any of claims 1 to 5;
preferably, the method comprises the steps of:
a) respectively weighing polyurethane prepolymer, chain extender, ultra-high molecular weight polyethylene powder, antioxidant and alumina powder according to the weight parts;
b) performing silanization treatment on the ultrahigh molecular weight polyethylene powder and the alumina powder;
c) adding a polyurethane prepolymer, ultra-high molecular weight polyethylene powder and alumina powder into a tank A of a casting machine, uniformly mixing, controlling the temperature at 95-100 ℃, and stirring at a medium speed of 650-900 rpm;
d) adding a chain extender into a B tank of the casting machine, controlling the temperature at 118-122 ℃, adding an antioxidant after the chain extender is completely melted, and stirring at a high speed of 1000-2000 rpm;
e) cleaning the surface of a mold, spraying a release agent in the mold, and preheating in an oven at 110-125 ℃ for later use;
f) mixing the liquid in the tank A and the liquid in the tank B according to the control proportion of a casting machine, vacuumizing, keeping the temperature at 110-125 ℃, stirring at the rotating speed of 2500-3000 rpm for 1-2 min at a high speed, and casting into a mold;
g) placing the mold in an oven at 110-120 ℃, heating for 30-45 min, taking out and demolding;
h) putting the demoulded product into a drying oven at 110-120 ℃ again for secondary vulcanization, wherein the vulcanization time is 16-20 h;
i) machining the blanks subjected to secondary vulcanization to obtain the piston sealing body;
preferably, the silanization treatment of the ultra-high molecular weight polyethylene powder and the alumina powder is performed according to the method defined in claim 3 or 4.
9. A piston comprising the piston seal body of claim 7;
preferably, the piston is a concrete piston.
10. A delivery cylinder comprising the piston seal of claim 7 or the piston of claim 9.
11. A concrete pumping apparatus (such as a pump truck, trailer pump, truck pump, for example) comprising a piston seal of claim 7, a piston of claim 9 or a delivery cylinder of claim 10.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114523606A (en) * | 2022-04-24 | 2022-05-24 | 合肥精创科技有限公司 | High-performance double-hardness piston for slurry pump and preparation method thereof |
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