CN116478530B - Wear-resistant antistatic polyamide composite material and preparation method thereof - Google Patents
Wear-resistant antistatic polyamide composite material and preparation method thereof Download PDFInfo
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- CN116478530B CN116478530B CN202310344901.1A CN202310344901A CN116478530B CN 116478530 B CN116478530 B CN 116478530B CN 202310344901 A CN202310344901 A CN 202310344901A CN 116478530 B CN116478530 B CN 116478530B
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- 239000002131 composite material Substances 0.000 title claims abstract description 36
- 239000004952 Polyamide Substances 0.000 title claims abstract description 30
- 229920002647 polyamide Polymers 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 21
- 239000003365 glass fiber Substances 0.000 claims abstract description 14
- 239000002216 antistatic agent Substances 0.000 claims abstract description 7
- 229920006122 polyamide resin Polymers 0.000 claims abstract description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 42
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 42
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 30
- 239000002245 particle Substances 0.000 claims description 24
- 238000005299 abrasion Methods 0.000 claims description 20
- 239000003963 antioxidant agent Substances 0.000 claims description 11
- 238000001125 extrusion Methods 0.000 claims description 6
- 239000000314 lubricant Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- -1 polytetrafluoroethylene Polymers 0.000 claims description 4
- KHXKESCWFMPTFT-UHFFFAOYSA-N 1,1,1,2,2,3,3-heptafluoro-3-(1,2,2-trifluoroethenoxy)propane Chemical compound FC(F)=C(F)OC(F)(F)C(F)(F)C(F)(F)F KHXKESCWFMPTFT-UHFFFAOYSA-N 0.000 claims description 3
- 229920002292 Nylon 6 Polymers 0.000 claims description 3
- 239000012752 auxiliary agent Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 claims description 3
- 239000000155 melt Substances 0.000 claims description 3
- 239000002671 adjuvant Substances 0.000 claims 1
- 239000003513 alkali Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000000463 material Substances 0.000 description 13
- 230000003078 antioxidant effect Effects 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 239000000725 suspension Substances 0.000 description 5
- HPGGPRDJHPYFRM-UHFFFAOYSA-J tin(iv) chloride Chemical compound Cl[Sn](Cl)(Cl)Cl HPGGPRDJHPYFRM-UHFFFAOYSA-J 0.000 description 5
- 238000001354 calcination Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- FAPDDOBMIUGHIN-UHFFFAOYSA-K antimony trichloride Chemical compound Cl[Sb](Cl)Cl FAPDDOBMIUGHIN-UHFFFAOYSA-K 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 2
- 229910021627 Tin(IV) chloride Inorganic materials 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 229920006351 engineering plastic Polymers 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004537 pulping Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000009210 therapy by ultrasound Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- WBWXVCMXGYSMQA-UHFFFAOYSA-N 3,9-bis[2,4-bis(2-phenylpropan-2-yl)phenoxy]-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane Chemical compound C=1C=C(OP2OCC3(CO2)COP(OC=2C(=CC(=CC=2)C(C)(C)C=2C=CC=CC=2)C(C)(C)C=2C=CC=CC=2)OC3)C(C(C)(C)C=2C=CC=CC=2)=CC=1C(C)(C)C1=CC=CC=C1 WBWXVCMXGYSMQA-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- OKOBUGCCXMIKDM-UHFFFAOYSA-N Irganox 1098 Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)NCCCCCCNC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 OKOBUGCCXMIKDM-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 1
- 239000008116 calcium stearate Substances 0.000 description 1
- 235000013539 calcium stearate Nutrition 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 229920006242 ethylene acrylic acid copolymer Polymers 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 229920002313 fluoropolymer Polymers 0.000 description 1
- 239000004811 fluoropolymer Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 229920006150 hyperbranched polyester Polymers 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 102200082816 rs34868397 Human genes 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 150000007970 thio esters Chemical class 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
- C08L77/02—Polyamides derived from omega-amino carboxylic acids or from lactams thereof
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/001—Conductive additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/04—Antistatic
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to a wear-resistant antistatic polyamide composite material and a preparation method thereof. The composite material comprises the following components in parts by weight: 35-65 parts of polyamide resin; 10-20 parts of glass fiber; 10-20 parts of an antiwear agent; 15-25 parts of antistatic agent. The composite material has better wear resistance and antistatic property.
Description
Technical Field
The invention belongs to the field of engineering plastics, and particularly relates to a wear-resistant antistatic polyamide composite material and a preparation method thereof.
Background
Polyamide commonly called nylon (PA) is crystalline engineering plastic, has the advantages of excellent comprehensive mechanical properties, wear resistance, solvent resistance and the like, and is widely applied to the fields of automobiles, electronic appliances, machinery, instruments and meters and the like. When used as parts with relative motion such as bearings and gears, the polyamide has certain limitations on wear resistance, mechanical strength and the like, and particularly in occasions with high load, high frequency, high speed and long-term motion, the polyamide is required to be reinforced and wear-resistant modified in practice so as to ensure the service life of the parts and the safety of equipment. The polyamide has good electrical insulation property as most high polymer materials, the volume resistivity of the polyamide is generally 10 13～1015 ohm cm, the conductivity of the polyamide is far smaller than that of metal materials, and the polyamide is easier to accumulate charges to generate static electricity in the processing and using processes. Parts with static electricity are easy to generate dust static adsorption and even generate static breakdown to cause damage to electronic components. Therefore, in some occasions where the antistatic requirement is high, research is required to solve the antistatic or conductive problems of the wear-resistant material.
Fluoropolymers generally have good self-lubricating properties and a low coefficient of friction and are often used as wear resistant materials or wear resistant additives. Chinese patent CN105849182a discloses a sliding material with addition of PTFE (polytetrafluoroethylene) of multimodal molecular weight, optimizing the coefficient of friction and wear resistance of a thermoplastic-based sliding material by adding PTFE having at least two different molecular weights; this approach, while improving wear resistance, has limited improvement. Chinese patent CN100458598C discloses a fixing rotator which uses PFA (perfluoropropyl perfluorovinyl ether/polytetrafluoroethylene copolymer) and PTFE and a binder composition as coating layers to obtain good abrasion resistance and release effects, but PFA is mainly used as an improvement in release effects in the disclosed technology, but the modification is not suitable for injection molding. Furthermore, the above disclosed technology also does not mention the effect of improvement of wear resistance on the antistatic properties of the material itself. In practice, nylon materials are still required to be further improved in terms of wear resistance and antistatic property when used as injection molded fine parts such as precision gears, bearings, sliding parts and the like.
Disclosure of Invention
The invention aims to solve the technical problem of providing a wear-resistant antistatic polyamide composite material and a preparation method thereof, so as to overcome the defect of poor wear resistance and antistatic property of a polyamide material in the prior art.
The invention provides a wear-resistant antistatic polyamide composite material, which comprises the following components in parts by weight:
The wear-resistant agent comprises 50% -80% of polytetrafluoroethylene PTFE and 50% -20% of perfluoropropyl perfluorovinyl ether/polytetrafluoroethylene copolymer PFA according to weight ratio, wherein the number average molecular weight of the PTFE is 9 multiplied by 10 3-7×104 g/mol, and the number average molecular weight of the PFA is 5 multiplied by 10 5-5×106 g/mol.
Preferably, the composite material comprises the following components in parts by weight:
Preferably, the polyamide resin is nylon 6.
Preferably, the weight ratio of PTFE in the wear-resistant agent is 55% -75%, and the weight ratio of PFA is 45% -25%.
Preferably, the PTFE has an average particle diameter of 2 μm to 25. Mu.m. The particle size of the wear-resistant PTFE has obvious influence on the friction coefficient, and the reason is probably that if the size of the powder is too small, the coating surface of the micro powder particles by the matrix is small, the holding force is small, and the micro powder particles are easy to fall off in the sliding friction process; when the particle size is too large, the number of PTFE particles distributed on the friction surface is relatively reduced, the total contact area with the friction surface is reduced, and the contact area between the matrix resin and the friction surface is relatively increased, so that the reduction of the friction coefficient is not facilitated.
More preferably, the PTFE has an average particle diameter of 10 μm to 12. Mu.m.
Preferably, the glass fibers are chopped alkali-free glass fibers.
Preferably, the antistatic agent is a conductive whisker comprising conductive potassium titanate whisker and/or conductive calcium sulfate whisker.
Preferably, the preparation method of the conductive calcium sulfate whisker comprises the following steps: pulping calcium sulfate whisker in deionized water, performing ultrasonic treatment to obtain a calcium sulfate suspension, adding hydrochloric acid solution of tin chloride and antimony chloride, stirring and mixing, filtering, washing, drying, grinding, and calcining (calcining can remove crystal water from the calcium sulfate whisker) to obtain the conductive calcium sulfate whisker.
Preferably, the calcium sulfate suspension concentration is 15-25g/mL.
Preferably, the mol ratio of the stannic chloride, the antimonic chloride and the calcium sulfate whisker is 1 (2.5-3.5): 1.5-2.5.
Preferably, the concentration of the hydrochloric acid solution of the stannic chloride and the antimony chloride is 3-10mol/L.
Preferably, the calcination temperature is 700-800 ℃ and the calcination time is 1-5 hours.
Preferably, the composite material further comprises 0-2 parts of other auxiliary agents.
Preferably, the further auxiliary agent comprises an antioxidant and/or a lubricant.
Preferably, the antioxidant is 0.1-0.5 parts by weight.
Preferably, the antioxidant comprises one or more of hindered amine antioxidants, phosphite antioxidants and thioester antioxidants.
Preferably, the lubricant is 0.3 to 1 part by weight.
Preferably, the lubricant comprises one or more of stearate, hyperbranched polyester, aliphatic fatty acid ester, ethylene-acrylic acid copolymer.
The invention also provides a preparation method of the wear-resistant antistatic polyamide composite material, which comprises the following steps:
Mixing all components except glass fiber, adding the obtained premix into a double-screw extruder from a main feeding port, feeding the glass fiber into the double-screw extruder from side, and carrying out melt extrusion, water cooling and granulating to obtain the wear-resistant antistatic polyamide composite material.
Preferably, the melt extrusion temperature is 200 to 270 ℃.
Preferably, the length-diameter ratio of the main machine screw of the double-screw extruder is (30-40): 1, and the rotating speed is 250-350r/min.
The invention also provides application of the wear-resistant antistatic polyamide composite material in electronic mechanical equipment, such as sliding bearings, transmission gears and the like.
The invention adopts the combination of the low molecular weight PTFE and the high molecular weight PFA, the high molecular weight PFA particles on the friction interface are uniformly distributed around the low molecular weight PTFE particles, and can disperse and bear partial friction stress, so that the PTFE transfer film delays the damage and the falling off, the composite material matrix can be better protected, and the wear resistance of the composite material is improved while the lower friction coefficient is kept.
Advantageous effects
The invention adopts the combination of low molecular weight PTFE and high molecular weight PFA, can obviously improve the wear resistance of the composite material and simultaneously ensure the antistatic property of the composite material. The dynamic friction coefficient of the composite material is below 0.23, such as 0.17-0.23, the abrasion loss is below 60mg, such as 19-56mg, and the volume resistivity is below 7.5X10 9 Ω cm, such as 2.5X10 8-7.3×109 Ω cm.
Detailed Description
The application will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present application and are not intended to limit the scope of the present application. Furthermore, it should be understood that various changes and modifications can be made by one skilled in the art after reading the teachings of the present application, and such equivalents are intended to fall within the scope of the application as defined in the appended claims.
Reagent source:
polyamide resin: brand PA6 HY2800A, sea-sun chemical fiber group;
Glass fiber: trade mark ECS11-03-560A, china boulder Co., ltd;
Wear-resistant agent:
Wear-resistant agent 1-1: PTFE, having a number average molecular weight of 3X 10 4 g/mol, an average particle diameter of 12 μm, a brand GR-C0590P, a new material Co., ltd;
wear-resistant agent 1-2: PTFE having a number average molecular weight of 1.2X10 4 g/mol, an average particle size of 2.5 μm, a brand GR-C525, a new material Co., ltd;
Wear-resistant agent 1-3: PTFE having a number average molecular weight of 5X 10 4 g/mol and an average particle diameter of 25 μm, and having a trade name of RF-225A, langfang Runfulong technologies Co., ltd;
Wear-resistant agent 1-4: PTFE with a number average molecular weight of 9X 10 3 g/mol, an average particle size of 1.5 μm, a brand A01, shenyang Tianyuxiang micro powder materials factory;
Wear-resistant agent 1-5: PTFE having a number average molecular weight of 5.5X10 4 g/mol and an average particle diameter of 28 μm, trade name M111, japanese big gold company.
Wear-resistant agent 1-6: PTFE with a number average molecular weight of 6.5X10 3 g/mol, an average particle size of 3.5 μm, a trade mark A02, shenyang Tianyuxiang micro powder materials factory;
Wear-resistant agent 1-7: PTFE has a number average molecular weight of 1X 10 5 g/mol, an average particle diameter of 20 μm, a trade name of M112, japanese Kogyo Co.
Wear-resistant agent 2-1: PFA, number average molecular weight 3.5X10 6 g/mol, trade name AC5600, dajin, japan;
2-2 of an antiwear agent: PFA having a number average molecular weight of 5.5X10 5 g/mol, brand ACX-34, dajin Corp;
2-3 parts of wear-resistant agent: PFA, number average molecular weight 2.3X10 5 g/mol, trade name P7010, suwei Co., USA;
2-4 parts of wear-resistant agent: PFA having a number average molecular weight of 6.5X10 6 g/mol, brand ACX-31, dajin Corp;
Antistatic agent 1: conductive potassium titanate whisker with the trade name ECP-TF1 and Beijing special security antistatic equipment factory;
Antistatic agent 2: the preparation method of the conductive calcium sulfate whisker comprises the following steps: pulping calcium sulfate whisker (NP-M02-I30 of Shanghai Feng Zhu composite New Material science and technology Co., ltd.) in deionized water, and performing ultrasonic treatment to fully disperse to obtain calcium sulfate suspension with the concentration of 20g/mL; adding 6mol/L tin chloride and antimony chloride (molar ratio 1:3) hydrochloric acid solution into the calcium sulfate suspension, and stirring and mixing, wherein the molar ratio of the tin chloride to the calcium sulfate whisker is 1:2; filtering, washing, drying and grinding the suspension into particles; then conducting high-temperature treatment for 3 hours at 750 ℃ to obtain conductive calcium sulfate whisker;
Other auxiliaries:
An antioxidant: a mixture of hindered amine antioxidant (N, N' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine) and phosphite antioxidant (bis (2, 4-dicumylphenyl) pentaerythritol diphosphite) in a weight ratio of 1:1, commercially available; and (3) a lubricant: calcium stearate, commercially available;
unless otherwise specified, both the parallel examples and comparative examples of the present invention are commercially available products in which one component (e.g., antioxidant, lubricant) is the same.
The preparation method of the polyamide composite material comprises the following steps: according to the proportions shown in tables 1, 2 and 3, the components except glass fibers are put into a high-speed mixer to be mixed and stirred uniformly, the obtained premix is added into a double-screw extruder from a main feeding port, the glass fibers are fed and added at the side, and the wear-resistant antistatic polyamide composite material is obtained through melt extrusion, water cooling and granulating, wherein the melt extrusion temperature is 200-270 ℃, the length-diameter ratio of the screw is (30-40): 1, and the rotating speed is 250-350r/min.
The prepared polyamide composite material is subjected to injection molding to prepare a test square board for performance test evaluation:
(1) Antistatic performance test: the volume resistivity of the material was tested with reference to GB1410-1989 test method for volume and surface resistivity of solid insulation material.
(2) Abrasion resistance test: the dynamic friction coefficient and the abrasion loss of the material were measured with reference to JIS K7218-1986 Plastic sliding abrasion test method; a method, ring abrasion test conditions: for carbon steel in grinding material S45C, the load was 200N, the speed was 0.5m/S, the test time=100 min, the drying was performed at 80 ℃/10h before the test, and the weight change was measured after the drying at 80 ℃/10h after the test.
Table 1 examples 1-9 proportions (parts by weight)
Table 2 examples 10-15 ratios (parts by weight)
Table 3 comparative example ratio (parts by weight)
As is clear from tables 1 to 3, the polyamide composite material of the present invention has a dynamic friction coefficient of 0.17 to 0.23, an abrasion loss of 19 to 56mg and a volume resistivity of 2.5X10 8-7.3×109. Omega. Cm. The average particle diameter of PTFE in example 1 was 12. Mu.m, the average particle diameter of PTFE in example 2 was 2.5. Mu.m, the average particle diameter of PTFE in example 3 was 25. Mu.m, the average particle diameter of PTFE in example 4 was 1.5. Mu.m, the average particle diameter of PTFE in example 5 was 28. Mu.m, the coefficient of kinetic friction and the abrasion loss in example 1 were smaller than those in examples 2 to 5, and the volume resistivity was in the range of 10 6-109 Ω cm, belonging to the antistatic grade; the dynamic friction coefficient and abrasion loss of examples 2-3 are smaller than those of examples 4-5, the volume resistivity is in the range of 10 6-109 Ω & cm, and the PTFE has a preferable average particle size, so that the dynamic friction coefficient and abrasion loss can be reduced, and the antistatic performance can be ensured. PTFE in examples 1 and 6 accounts for 50 percent and 80 percent of the total weight of the wear-resistant agent, PTFE in examples 7 and 8 accounts for 55 percent and 75 percent of the total weight of the wear-resistant agent, respectively, the dynamic friction coefficient and the abrasion loss of examples 7 and 8 are smaller than those of examples 1 and 6, and the volume resistivity is in the range of 10 6-109 Ω & cm, belonging to the antistatic grade; it follows that the PTFE ratio is preferred to reduce the coefficient of dynamic friction and the amount of abrasion while ensuring antistatic properties. The preferred parts by weight of each component in examples 13 and 14, the non-preferred parts by weight of each component in examples 11 and 12, the dynamic friction coefficient and abrasion loss of examples 13 and 14 are less than those of examples 11 and 12, the volume resistivity is in the range of 10 6-109 Ω & cm, and the antistatic grade is achieved; therefore, the preferable weight parts of the components can reduce the dynamic friction coefficient and the abrasion loss, and ensure the antistatic performance.
The PTFE molecular weights in comparative examples 1 and 2 are not within the scope of the present invention, and the PFA molecular weights in comparative examples 3 and 4 are not within the scope of the present invention, and the dynamic friction coefficients, abrasion amounts, volume resistivities of comparative examples 1 to 4 are significantly inferior to those of example 1. Therefore, the invention adopts the combination of the low molecular weight PTFE and the high molecular weight PFA, can obviously improve the wear resistance of the composite material and simultaneously ensures the antistatic property of the composite material.
Claims (9)
1. The wear-resistant antistatic polyamide composite material is characterized by comprising the following components in parts by weight:
35-65 parts of polyamide resin;
10-20 parts of glass fiber;
10-20 parts of an antiwear agent;
15-25 parts of antistatic agent;
The wear-resistant agent comprises 50% -80% of polytetrafluoroethylene PTFE and 50% -20% of perfluoropropyl perfluorovinyl ether/polytetrafluoroethylene copolymer PFA according to the weight ratio, wherein the number average molecular weight of the PTFE is 9 multiplied by 10 3-5.5×104 g/mol, and the number average molecular weight of the PFA is 5 multiplied by 10 5-3.5×106 g/mol;
The PTFE has an average particle diameter of 2 μm to 25. Mu.m.
2. The wear-resistant antistatic polyamide composite material according to claim 1, wherein the composite material comprises, in parts by weight:
40-60 parts of polyamide resin;
12-18 parts of glass fiber;
12-18 parts of an antiwear agent;
18-22 parts of antistatic agent.
3. The abrasion resistant antistatic polyamide composite material according to claim 1, wherein said polyamide resin is nylon 6; the weight ratio of PTFE in the wear-resistant agent is 55% -75%, and the weight ratio of PFA is 45% -25%.
4. The abrasion resistant antistatic polyamide composite material of claim 1 wherein said glass fibers are chopped alkali free glass fibers.
5. The abrasion resistant antistatic polyamide composite material according to claim 1, wherein the antistatic agent is a conductive whisker comprising conductive potassium titanate whisker and/or conductive calcium sulfate whisker.
6. The abrasion resistant antistatic polyamide composite material according to claim 1, wherein said composite material further comprises 0-2 parts of other adjuvants; the other auxiliary agents comprise antioxidants and/or lubricants.
7. A method of making the abrasion resistant antistatic polyamide composite material of any one of claims 1-6, comprising:
Mixing all components except glass fiber, adding the obtained premix into a double-screw extruder from a main feeding port, feeding the glass fiber into the double-screw extruder from side, and carrying out melt extrusion, water cooling and granulating to obtain the wear-resistant antistatic polyamide composite material.
8. The method according to claim 7, wherein the melt extrusion temperature is 200-270 ℃.
9. Use of a wear resistant antistatic polyamide composite material according to any one of claims 1-6 in an electromechanical device.
Priority Applications (1)
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| US4351882A (en) * | 1981-01-13 | 1982-09-28 | E. I. Du Pont De Nemours And Company | Article coated with fluoropolymer finish with improved durability |
| US5874489A (en) * | 1996-10-15 | 1999-02-23 | E. I. Du Pont De Nemours And Company | Nonstick finish for molding articles |
| CN101242912A (en) * | 2005-08-12 | 2008-08-13 | 纳幕尔杜邦公司 | Process for improving the corrosion resistance of a non-stick coating on a substrate |
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