CN114891182B - High-temperature-resistant sealing material for main sealing of excavator and preparation method thereof - Google Patents
High-temperature-resistant sealing material for main sealing of excavator and preparation method thereof Download PDFInfo
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- CN114891182B CN114891182B CN202210585790.9A CN202210585790A CN114891182B CN 114891182 B CN114891182 B CN 114891182B CN 202210585790 A CN202210585790 A CN 202210585790A CN 114891182 B CN114891182 B CN 114891182B
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- 238000007789 sealing Methods 0.000 title claims abstract description 24
- 239000003566 sealing material Substances 0.000 title claims abstract description 16
- 238000002360 preparation method Methods 0.000 title abstract description 5
- 239000004970 Chain extender Substances 0.000 claims abstract description 25
- 238000006243 chemical reaction Methods 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 21
- 238000002156 mixing Methods 0.000 claims description 19
- 238000003756 stirring Methods 0.000 claims description 18
- HVLLSGMXQDNUAL-UHFFFAOYSA-N triphenyl phosphite Chemical compound C=1C=CC=CC=1OP(OC=1C=CC=CC=1)OC1=CC=CC=C1 HVLLSGMXQDNUAL-UHFFFAOYSA-N 0.000 claims description 12
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 8
- 239000004417 polycarbonate Substances 0.000 claims description 7
- 229920000515 polycarbonate Polymers 0.000 claims description 7
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 claims description 6
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 6
- 239000004698 Polyethylene Substances 0.000 claims description 6
- 239000013530 defoamer Substances 0.000 claims description 6
- 150000002009 diols Chemical class 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- -1 polyethylene Polymers 0.000 claims description 6
- 229920000573 polyethylene Polymers 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 5
- 229920001610 polycaprolactone Polymers 0.000 claims description 4
- 239000004632 polycaprolactone Substances 0.000 claims description 4
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 abstract description 11
- 230000006835 compression Effects 0.000 abstract description 11
- 238000007906 compression Methods 0.000 abstract description 11
- 239000012752 auxiliary agent Substances 0.000 abstract description 6
- 239000003963 antioxidant agent Substances 0.000 abstract description 5
- 230000003078 antioxidant effect Effects 0.000 abstract description 5
- 239000012948 isocyanate Substances 0.000 abstract description 5
- 150000002513 isocyanates Chemical class 0.000 abstract description 5
- 239000003921 oil Substances 0.000 abstract description 5
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 2
- 150000005846 sugar alcohols Polymers 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 18
- 238000012360 testing method Methods 0.000 description 18
- 229920002635 polyurethane Polymers 0.000 description 13
- 239000004814 polyurethane Substances 0.000 description 13
- 239000010720 hydraulic oil Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- ALQLPWJFHRMHIU-UHFFFAOYSA-N 1,4-diisocyanatobenzene Chemical group O=C=NC1=CC=C(N=C=O)C=C1 ALQLPWJFHRMHIU-UHFFFAOYSA-N 0.000 description 6
- 230000032683 aging Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 230000007774 longterm Effects 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000036632 reaction speed Effects 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000004073 vulcanization Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- MFEWNFVBWPABCX-UHFFFAOYSA-N 1,1,2,2-tetraphenylethane-1,2-diol Chemical group C=1C=CC=CC=1C(C(O)(C=1C=CC=CC=1)C=1C=CC=CC=1)(O)C1=CC=CC=C1 MFEWNFVBWPABCX-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical compound ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- DHZIIRMIXLYCRQ-UHFFFAOYSA-N benzene-1,4-dicarbonyl isocyanate Chemical compound O=C=NC(=O)C1=CC=C(C(=O)N=C=O)C=C1 DHZIIRMIXLYCRQ-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- XXMIOPMDWAUFGU-UHFFFAOYSA-N hexane-1,6-diol Chemical compound OCCCCCCO XXMIOPMDWAUFGU-UHFFFAOYSA-N 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000028161 membrane depolarization Effects 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920003225 polyurethane elastomer Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/4202—Two or more polyesters of different physical or chemical nature
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/4266—Polycondensates having carboxylic or carbonic ester groups in the main chain prepared from hydroxycarboxylic acids and/or lactones
- C08G18/4269—Lactones
- C08G18/4277—Caprolactone and/or substituted caprolactone
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/44—Polycarbonates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
- C08G18/6633—Compounds of group C08G18/42
- C08G18/6637—Compounds of group C08G18/42 with compounds of group C08G18/32 or polyamines of C08G18/38
- C08G18/664—Compounds of group C08G18/42 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2190/00—Compositions for sealing or packing joints
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
Abstract
The application discloses a high-temperature-resistant sealing material for main sealing of a digging machine and a preparation method thereof, wherein the sealing material is prepared from the following raw materials in mass: 18-25 parts of isocyanate, 65-75 parts of hydroxyl-terminated long-chain dihydric alcohol, 5-15 parts of first chain extender, 1-10 parts of second chain extender, 1-5 parts of third chain extender, 1.5-3 parts of antioxidant, 1-2 parts of wear-resistant auxiliary agent and 0.1-1 part of internal demoulding auxiliary agent; the first chain extender is short-chain dihydric alcohol, the second chain extender is dihydric alcohol containing benzene ring, and the third chain extender is polyhydric alcohol containing trihydroxy; the sealing material of the application has low oil resistance, high temperature resistance and high temperature compression permanent shape.
Description
Technical Field
The invention relates to the field of hydraulic cylinder sealing, in particular to a high-temperature-resistant sealing material for main sealing of a digging machine and a preparation method thereof.
Background
The hydraulic cylinder is the most central actuator of hydraulic machinery, especially engineering machinery, and is the hydraulic actuator which converts hydraulic energy into mechanical energy and makes linear reciprocating motion (or swinging motion). The medium-large excavator is acknowledged as the outdoor operation equipment with the highest engineering mechanical complexity and the worst working condition, the hydraulic sealing system and the sealing piece are required to be strictly required, the piston rod of the hydraulic cylinder is required to bear the conventional ultrahigh pressure of 40Mpa, the ultimate instantaneous ultrahigh pressure of 80Mpa, the operation speed of 1m/s, the oil cylinder stroke of 500-1200 mm, the long-term working temperature of 100-120 ℃ and the ultimate temperature of 130-140 ℃.
Therefore, the buffer sealing and main sealing materials on the excavator are required to be suitable for working environments of high-load and high-frequency hydraulic oil at 100-120 ℃ for a long time, and meanwhile, the following performance under high-frequency movement can be met, and the sealing effect under low pressure is excellent.
Chinese patent publication No. CN105037676B discloses cast polyurethane elastomers prepared with terephthalyl isocyanate as the isocyanate component, which have lower compression set at room temperature but lower tensile strength than 30Mpa.
Similar to CN105037676B, the polyurethane seals currently in common use suffer from several disadvantages (1) a significant decrease in material strength in high temperature hydraulic oils; (2) high compression set at high temperature and poor sealing effect; (3) The high frequency movement of the steel piston rod can cause obvious heat generation in the material, and the material can rapidly lose efficacy at high temperature. At present, a polyurethane material sealing piece can not be applied to a main sealing of a piston rod of a middle-high-end excavator for a long time.
Therefore, the developed material suitable for sealing the hydraulic cylinder has certain production and application values.
Disclosure of Invention
The first object of the invention is to provide a high temperature resistant sealing material for an excavator, which has the advantages of oil resistance and low compression set at high temperature.
The invention aims to solve the problem that the sealing ring material on the existing hydraulic engineering machinery has short service life under the high-temperature working condition, on one hand, the sealing member leaks due to the compression permanent deformation difference of the polyurethane material under the high temperature, and on the other hand, the sealing member material has the problems of thoroughly damaging and losing efficacy such as cracking due to the rapid reduction of the physical and mechanical properties of the sealing member material due to long-term high-temperature hydraulic oil.
The technical aim of the invention is realized by the following technical scheme:
The high-temperature-resistant sealing material for the main seal of the excavator is prepared from the following raw materials in mass: 18-25 parts of isocyanate, 65-75 parts of hydroxyl-terminated long-chain dihydric alcohol, 5-15 parts of first chain extender, 1-10 parts of second chain extender, 1-5 parts of third chain extender, 1.5-3 parts of antioxidant, 1-2 parts of wear-resistant auxiliary agent and 0.1-1 part of internal demoulding auxiliary agent;
the first chain extender is short-chain dihydric alcohol, the second chain extender is dihydric alcohol containing benzene ring, and the third chain extender is polyhydric alcohol containing trihydroxy.
Further, the isocyanate is p-phenylene diisocyanate.
Further, the hydroxyl-terminated long-chain dihydric alcohol is polycarbonate dihydric alcohol, the number average molecular weight of which is 1000-3000, and the molecular weight distribution of which is 1.1-1.4.
Further, the first chain extender is 1, 4-butanediol or 1, 6-hexanediol.
Further, the second chain extender is tetraphenyl ethylene glycol, and the structural formula of the second chain extender is shown in the formula (I):
Furthermore, the third chain extender is polycaprolactone triol, the number average molecular weight of which is 300-500, and the molecular weight distribution of which is 1.1-1.25, and the structural formula of which is shown in the formula (II):
further, the antioxidant is a composite antioxidant, which comprises 75wt% of antioxidant 264 and 25wt% of triphenyl phosphite.
Furthermore, the wear-resistant auxiliary agent is polyethylene wax.
The second object of the invention is to provide a method for preparing the high-temperature-resistant sealing material for the main sealing of the excavator.
The technical aim of the invention is realized by the following technical scheme:
The method for preparing the high-temperature-resistant sealing material for the main sealing of the excavator comprises the following steps of:
(1) Preparation of prepolymer A component
Adding a formula amount of polycarbonate diol into a reaction kettle, heating to 100-105 ℃, adding a pre-prepared antioxidant, wear-resistant auxiliary agent and defoamer mixture, stirring and mixing uniformly, vacuumizing and defoaming for 1-2 hr at 100-105 ℃ until all materials in the kettle are completely dissolved, closing vacuum and continuing stirring for 0.5hr, and cooling to 70-80 ℃;
Adding isocyanate with the formula amount into a reaction kettle, stirring and mixing uniformly, reacting for 0.5-2 hr at 70-130 ℃, testing the NCO content, and stopping the reaction after the NCO content reaches a theoretical value to obtain a prepolymer A component;
(2) Chain extension reaction
Uniformly mixing the first chain extender, the second chain extender and the third chain extender according to the formula amount to obtain a mixed chain extender B component; pouring the mixed chain extender B component into the prepolymer A component, stirring, mixing and defoaming at high speed in a planetary stirrer, and rapidly pouring the mixture into a die with the inner wall sprayed with a layer of release agent with the thickness of 35-45 mu m and preheated to 110-120 ℃; the mould is placed in an oven with the temperature of 110-120 ℃ for vulcanization for 16-24 hours, taken out, naturally cooled and placed for one week.
The technical effects of the invention are mainly as follows:
The PPDI molecular structure has high symmetry ①, very efficient van der waals force ②, efficient electron depolarization ③, strong hydrogen bonding ④, and high phase separation ⑤. The pi-orbits enable intermolecular electrons to flow continuously in the PPDI structure, electrons are highly delocalized, an unobstructed aromatic structure is created, dipole action is created and hydrogen bonding effect is enhanced. The polyurethane prepared from PPDI has high microphase separation degree, small internal heat generation and good dynamic performance. The rigid structure of the polyurethane hard segment is greatly improved by introducing the chain extender containing the multi-benzene ring structure into the hard segment, so that extremely excellent heat resistance is obtained. On the other hand, as the hard segment structure formed by PPDI and small molecular straight chain dihydric alcohol and dihydric alcohol containing multiple benzene rings has extremely strong rigidity, the reaction speed is high in the chain extension process, and the reaction speed is not easy to control, the chain extension reaction speed can be effectively relieved by introducing the trifunctional hydroxyl-terminated trihydric alcohol, and meanwhile, the compression permanent deformation of the prepared polyurethane is improved. In conclusion, the polyurethane prepared by the invention has very low compression set performance at high temperature, and can still maintain excellent performance under long-term high-temperature hydraulic oil working condition.
Drawings
FIG. 1 is a DMA test of example 1;
FIG. 2 is a DMA test of comparative example 1;
FIG. 3 is a DMA test of comparative example 2;
Fig. 4 is a leakage amount evaluation test of example 1 and comparative example 1.
Detailed Description
The following detailed description of the invention is provided in connection with the accompanying drawings to facilitate understanding and grasping of the technical scheme of the invention.
Example 1: the high-temperature-resistant sealing material for the excavator sealing element is prepared by the following method: 2042g of polycarbonate diol PCDL 2000 is added into a reaction kettle, the temperature of the reaction kettle is heated to 100 ℃,45 g of antioxidant 264 and 15g of triphenyl phosphite are then added, 30g of polyethylene wax and 9g of defoamer are added into the reaction kettle, stirred and mixed uniformly, vacuum pumping and defoaming are carried out at 100 ℃ for 2 hours until all materials in the glass stirred kettle are completely dissolved, vacuum is closed, stirring is continued for half an hour, and the temperature is reduced to 75 ℃; adding 539, 539gPPDI into a reaction kettle, stirring and mixing to obtain a prepolymer component with NCO% content of 6.37%; heating and uniformly mixing 142g of 1, 4-butanediol, 164g of tetraphenyl glycol and 112g of polycaprolactone PCL305 to obtain a component B chain extender; mixing the A, B components in a planetary mixer for deaeration for 30s, rapidly pouring into a mold at 120 ℃, placing the mold in a baking oven at 110 ℃ for 24hr, taking out, naturally cooling, and placing for one week.
Example 2: the high-temperature-resistant sealing material for the excavator sealing element is prepared by the following method: 2042g of polycarbonate diol PCDL 2000 is added into a reaction kettle, the temperature of the reaction kettle is heated to 105 ℃,45 g of antioxidant 264 and 15g of triphenyl phosphite are then added, 30g of polyethylene wax and 9g of defoamer are added into the reaction kettle, stirred and mixed uniformly, vacuum pumping and defoaming are carried out at 105 ℃ for 1hr until all materials in the glass stirred kettle are completely dissolved, vacuum is closed, stirring is continued for half an hour, and the temperature is reduced to 70 ℃; adding 539, 539gPPDI into a reaction kettle, stirring and mixing to obtain a prepolymer component with NCO% content of 6.38%; heating and uniformly mixing 142g of 1, 4-butanediol, 164g of tetraphenyl glycol and 112g of polycaprolactone PCL305 to obtain a component B chain extender; mixing the A, B components in a planetary mixer for deaeration for 30s, rapidly pouring into a mold at 120 ℃, placing the mold in an oven at 120 ℃ for vulcanization for 16hr, taking out, naturally cooling and placing for one week.
Comparative example 1: a sealing material prepared by the following method: adding 1985g of polycarbonate diol PCDL 2000 into a reaction kettle, heating the reaction kettle to 100 ℃, then adding 45g of antioxidant 264 and 15g of triphenyl phosphite, adding 30g of polyethylene wax and 9g of defoamer into the reaction kettle, stirring and mixing uniformly, vacuumizing and defoaming for 2 hours at 100 ℃ until all materials in the glass stirring kettle are completely dissolved, closing vacuum and continuously stirring for half an hour, and cooling to 70 ℃; adding 524gPPDI into a reaction kettle, stirring and mixing to obtain a prepolymer component with NCO% content of 6.84%; adding 198g of 1, 4-butanediol B component into the component A prepolymer, then quickly mixing and defoaming for 30 seconds in a planetary mixer, quickly pouring into a die at 120 ℃, placing the die in a baking oven at 110 ℃ for 24 hours, taking out, naturally cooling and placing for one week.
Comparative example 2: a sealing material prepared by the following method: adding 1985g of polycarbonate diol PCDL 2000 into a reaction kettle, heating the reaction kettle to 100 ℃, then adding 45g of antioxidant 264 and 15g of triphenyl phosphite, adding 30g of polyethylene wax and 9g of defoamer into the reaction kettle, stirring and mixing uniformly, vacuumizing and defoaming for 2 hours at 100 ℃ until all materials in the glass stirring kettle are completely dissolved, closing vacuum and continuously stirring for half an hour, and cooling to 70 ℃; adding 825gMDI into a reaction kettle, stirring and mixing to obtain a prepolymer component with NCO% content of 6.20%; adding 196g1, 4-butanediol B component into the prepolymer of the component A, mixing and defoaming for 30s in a planetary mixer, rapidly pouring into a die at 120 ℃, placing the die in a baking oven at 110 ℃ for vulcanization for 24hr, taking out, naturally cooling and placing for one week.
Performance testing
The test pieces placed for one week were crushed into particles having a particle diameter of 1mm using a crusher, and the particles were injection molded into test pieces to be tested by an injection molding machine, and the properties of the obtained materials are shown in Table 1.
Table 1 is the physical property test results of examples and comparative examples, table 1 shows:
(1) The tensile strengths of example 1 and comparative example 1 are close at conventional temperatures; however, the strength of example 1 was 29MPa at 100℃and the strength retention was 50.9%, while the strength retention of comparative example 1 was 30.9%, whereas the tensile strength of MDI-type comparative example 2 was reduced to 6MPa at 100℃and the strength retention was only 11.3%, which means that it could not be used for a long period of time at high temperature.
(2) The results of the oil-resistant aging test show that the tensile strength performance of the high-temperature hydraulic oil in the example 1 can still be kept close to 50% after long-term aging, and the polyurethane molecular chain of the MDI-shaped material in the comparative example 1 is broken by the high-temperature hydraulic oil after long-time aging.
(3) The compression set test results of table 1 show that the high temperature resistant PPDI polyurethane of example 1 still has a low compression set at high temperature, the compression set of the polyurethane materials of comparative example 1 and comparative example 2 is significantly increased at high temperature, and the prepared seal product is capable of being used at normal temperature, and when the seal is at high temperature, the interference of the product is significantly reduced due to insufficient compression set, which results in rapid oil leakage and failure due to unsealing.
TABLE 1
DMA test
The instrument used for DMA test is Dynamic Mechanical Analyzer (DMA), and the software used is DYNATEST software.
The DMA test chart is shown in fig. 1-3, and fig. 1-3 show:
(1) FIG. 1 is a DMA test result of example 1, wherein the Storage Modulus Storage module is significantly reduced after reaching 170 ℃ and is significantly better than that of the conventional polyurethane material;
(2) The storage modulus of comparative example 1 and comparative example 2 began to decrease after 159.9 ℃ and 151.2 ℃ respectively;
(3) Example 1 has higher heat resistance.
Leakage amount evaluation
The evaluation experiment is an accelerated evaluation experiment for the polyurethane sealing members in the examples and the comparative examples for simulating actual application conditions. The seal products of the examples and comparative examples were first subjected to a pretreatment experiment of 1000h high temperature aging in 120 ℃ hydraulic oil and then mounted on the piston rod.
The hydraulic piston rod movement stroke (km) and the leakage amount were measured. The seal of comparative example 1 was broken after 120 ℃ hydraulic oil aging test, and the products of example 1 and example 2 after high temperature aging were installed into a hydraulic sealing system under the following test conditions:
Pressure: 35MPa (pulse frequency pressure maintaining 6 s/pressure release 2 s)
Temperature: 120-130 DEG C
Speed of: 1m/s
Experimental travel: 1000km.
Fig. 4 is a test result of the material of example 1 and comparative example as a main seal installed on a hydraulic piston rod to simulate the reciprocating high-speed high-pressure movement stroke and leakage of the piston rod under the practical application condition. The primary seal made of the high temperature resistant polyurethane material of example 1 can be used for long periods of time without leakage failure.
Of course, the above is only a typical example of the invention, and other embodiments of the invention are also possible, and all technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of the invention claimed.
Claims (1)
1. The high-temperature-resistant sealing material for the excavator sealing element is characterized by being prepared by the following steps:
2042g of polycarbonate diol PCDL2000 is added into a reaction kettle, the temperature of the reaction kettle is heated to 100 ℃, 45g of antioxidant 264 and 15g of triphenyl phosphite are then added, 30g of polyethylene wax and 9g of defoamer are added into the reaction kettle, stirred and mixed uniformly, vacuum pumping and defoaming are carried out at 100 ℃ for 2 hours until all materials in the glass stirred kettle are completely dissolved, vacuum is closed, stirring is continued for half an hour, and the temperature is reduced to 75 ℃; adding 539, 539gPPDI into a reaction kettle, stirring and mixing to obtain a prepolymer component with NCO% content of 6.37%; heating 142g of 1, 4-butanediol, 164g of tetraphenyl glycol and 112g of polycaprolactone PCL305, and uniformly mixing to obtain a B-component chain extender; mixing the A, B components in a planetary mixer for deaeration for 30s, rapidly pouring into a mold at 120 ℃, placing the mold in a baking oven at 110 ℃ for 24hr, taking out, naturally cooling, and placing for one week.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103923291A (en) * | 2014-03-27 | 2014-07-16 | 黎明化工研究设计院有限责任公司 | High-performance polyurethane elastomer and preparation method thereof |
| CN109942790A (en) * | 2019-04-10 | 2019-06-28 | 安徽鼎宏胶辊有限公司 | A kind of synthetic method of steel plate and aluminium foil coating roller polyurethane compositions |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103923291A (en) * | 2014-03-27 | 2014-07-16 | 黎明化工研究设计院有限责任公司 | High-performance polyurethane elastomer and preparation method thereof |
| CN109942790A (en) * | 2019-04-10 | 2019-06-28 | 安徽鼎宏胶辊有限公司 | A kind of synthetic method of steel plate and aluminium foil coating roller polyurethane compositions |
Non-Patent Citations (1)
| Title |
|---|
| 李光.《高分子材料加工工艺学》.中国纺织出版社,2020,(第1版),第207页. * |
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