CN112831179A - Low-water-absorption wear-resistant nylon bushing and preparation method thereof - Google Patents
Low-water-absorption wear-resistant nylon bushing and preparation method thereof Download PDFInfo
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- CN112831179A CN112831179A CN202110109314.5A CN202110109314A CN112831179A CN 112831179 A CN112831179 A CN 112831179A CN 202110109314 A CN202110109314 A CN 202110109314A CN 112831179 A CN112831179 A CN 112831179A
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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
- 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
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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
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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Abstract
The invention provides the preparation method of the low-water-absorption wear-resistant nylon bushing, which has the advantages of less used components, easily obtained components, low cost and simple preparation process. The preparation method comprises the following steps: putting nylon 6, PTFE and a nano inorganic substance into a mixer to mix for 1-2h to obtain a mixture; the weight percentage of each raw material is as follows: PTFE accounts for 10-20% of the weight of nylon 6, and the nano inorganic matter accounts for 3-11% of the weight of nylon 6; drying the mixture at 80-90 ℃ to ensure that the water content of the mixture is not more than 0.1%; adding the mixture into an injection molding machine, heating the mixture to 220-250 ℃ by the injection molding machine to be in a molten state, and injecting the mixture into a mold preheated to 60-80 ℃; and (4) demolding after the mold is cooled, taking out the injection molding piece, and machining to obtain the nylon bushing.
Description
Technical Field
The patent relates to a nylon bushing, in particular to a low-water-absorption wear-resistant nylon bushing and a preparation method thereof.
Background
CN201410298809.7 provides a low friction coefficient nylon 6 and polytetrafluoroethylene composition, which is prepared by adding pure water and polymerization inhibitor into a high-pressure reaction kettle, adding a certain amount of dispersant, initiator, nylon 6 powder, vinylidene fluoride, perfluoromethyl vinyl ether and maleic anhydride, heating to reaction temperature, obtaining nylon 6 with polymerized surface after the reaction is finished, filtering and drying the product, mixing the product with polytetrafluoroethylene in a high-speed mixer, and grinding and crushing the product in a pulverizer to obtain the composition. The method carries out surface modification on nylon 6 by maleic anhydride, vinylidene fluoride monomer and perfluoromethyl vinyl ether monomer, improves the compatibility with polytetrafluoroethylene, can fully contact in the crushing and mixing process, and has more uniform dispersion. The fluorine-containing polymer is coated on the surface of the nylon 6 particles, so that the surface energy of the nylon 6 particles is reduced, the scratch resistance of the particle surface is improved, and the friction coefficient of the composition is reduced. However, the method needs a plurality of auxiliary agents for polymerization reaction, and the reaction process is difficult to control and popularize.
CN200910051033.8 discloses a high-wear-resistance PA6 composite material and a preparation method thereof, wherein the composite material comprises the following components in percentage by weight: 56-82% of nylon, 2-5% of wear-resisting agent 1#2, 2-5% of wear-resisting agent 2#2, 5-15% of glass fiber powder, 5-15% of glass microspheres, 2-8% of graft type toughening modifier, 0.1-0.5% of nucleating agent, 0.1-1% of antioxidant and 0.1-0.5% of lubricating dispersant. The PA6 composite material prepared by the method has good wear resistance, but is easy to absorb water, so that the material has large-size flat wires and is not suitable for preparing precise parts. In addition, the method needs a plurality of auxiliary agents, and the product cost is higher.
Disclosure of Invention
The invention aims to provide a preparation method of a low-water-absorption wear-resistant nylon bushing, which has the advantages of less used components, easily obtained components, low cost and simple preparation process.
In order to realize the purpose, the preparation method of the low water absorption wear-resistant nylon bushing comprises the following steps:
step S1, putting nylon 6, PTFE and nano inorganic matter into a mixer to mix for 1-2h to obtain a mixture; the weight percentage of each raw material is as follows: PTFE accounts for 10-20% of the weight of nylon 6, and the nano inorganic matter accounts for 3-11% of the weight of nylon 6;
step S2, drying the mixture at 80-90 ℃ to ensure that the water content of the mixture is not more than 0.1%;
step S3, adding the mixture into an injection molding machine, heating the mixture to the temperature of 220 ℃ and 250 ℃ by the injection molding machine to be in a molten state, and injecting the mixture into a mold preheated to the temperature of 60-80 ℃;
step S4: and (4) demolding after the mold is cooled, taking out the injection molding piece, and machining to obtain the nylon bushing.
In the preparation method of the low water absorption wear-resistant nylon bushing, the nano inorganic substance comprises nano calcium carbonate and one of nano silicon dioxide or nano ceramic micro powder.
In the preparation method of the low-water-absorption wear-resistant nylon bushing, the nano silicon dioxide or nano ceramic micro powder accounts for 2-4% of the weight of the nylon 6, and the nano calcium carbonate accounts for 1-7% of the weight of the nylon 6.
In the preparation method of the low-water-absorption wear-resistant nylon bushing, the nano silicon dioxide or nano ceramic micro powder accounts for 2% of the weight of the nylon 6, and the nano calcium carbonate accounts for 6% of the weight of the nylon 6.
In the preparation method of the low water absorption wear-resistant nylon bushing, the weight of PTFE is 15-16% of that of nylon 6.
The invention also provides a low-water-absorption wear-resistant nylon bushing which has low friction coefficient, small water absorption and small dimensional deformation and is particularly suitable for being used in a high-humidity environment.
The low-water-absorption wear-resistant nylon bushing is prepared according to the preparation method of the low-water-absorption wear-resistant nylon bushing.
The beneficial effect of this patent: the method uses specific components to prepare the low water absorption wear-resistant nylon bushing which has low water absorption, small dimensional deformation, higher tensile strength, bending strength and impact resistance, and can not generate the phenomenon of locking when used as the bushing.
Detailed Description
The present invention will be further described with reference to the following examples.
The preparation method of the low-water-absorption wear-resistant nylon bushing comprises the following steps:
step S1, putting nylon 6, PTFE, nano silicon dioxide or nano ceramic micro powder and nano calcium carbonate into a mixer according to different weight ratios relative to the nylon 6 in the table 1, and mixing for 1.5h to obtain a mixture;
step S2, drying the mixture at 85-87 ℃ for about 5 hours to ensure that the water content of the mixture is not more than 0.1%;
step S3, adding the mixture into an injection molding machine, heating the mixture to the temperature of 220 ℃ and 250 ℃ by the injection molding machine to be in a molten state, and injecting the mixture into a mold preheated to the temperature of 65-70 ℃;
step S4: and (4) demolding after the mold is cooled, taking out the injection molding piece, and machining to obtain the nylon bushings of different embodiments.
The injection-molded parts or nylon bushings were tested according to the following criteria and the results are shown in table 1.
Tensile strength: ASTM D638-2003 plastic tensile property standard test method
Normal temperature impact strength: standard test method for determining pendulum impact resistance of plastic cantilever beam by ASTM D256-2006
Coefficient of friction: GB/T3960-2016
Water absorption: reference GB/T1034-
Bending strength: reference GB/T9341-: (80X 10X 4) mm, test speed: 2mm/min
From table 1, when PTFE is 10-20% by weight of nylon 6, nano silica or nano ceramic micropowder is 2-4% by weight of nylon 6, and nano calcium carbonate is 1-7% by weight of nylon 6, especially when PTFE is 15% by weight of nylon 6, nano silica or nano ceramic micropowder is 3% by weight of nylon 6, and nano calcium carbonate is 5-6% by weight of nylon 6, the injection molded part or nylon bush prepared by using the bush as a bush has a low friction coefficient, a small water absorption rate, and a small dimensional change, and when the bush is used, the bush does not produce a locking phenomenon with its matched parts (the bush inner hole is reduced to fix with a shaft passing through the bush inner hole, or the bush outer diameter is enlarged to fix with a hole matched with the bush outer diameter), and has good tensile strength, bending strength and impact resistance.
In the patent, the nano ceramic micro powder is a public sales product of Nanjing Tianxing new material Co.
Table 1:
Claims (6)
1. the preparation method of the low-water-absorption wear-resistant nylon bushing is characterized by comprising the following steps: the method comprises the following steps:
step S1, putting nylon 6, PTFE and nano inorganic matter into a mixer to mix for 1-2h to obtain a mixture; the weight percentage of each raw material is as follows: PTFE accounts for 10-20% of the weight of nylon 6, and the nano inorganic matter accounts for 3-11% of the weight of nylon 6;
step S2, drying the mixture at 80-90 ℃ to ensure that the water content of the mixture is not more than 0.1%;
step S3, adding the mixture into an injection molding machine, heating the mixture to the temperature of 220 ℃ and 250 ℃ by the injection molding machine to be in a molten state, and injecting the mixture into a mold preheated to the temperature of 60-80 ℃;
step S4: and (4) demolding after the mold is cooled, taking out the injection molding piece, and machining to obtain the nylon bushing.
2. The method for preparing the nylon bushing with low water absorption and wear resistance as claimed in claim 1, is characterized in that: the nano inorganic matter comprises nano calcium carbonate and one of nano silicon dioxide or nano ceramic micro powder.
3. The method for preparing the nylon bushing with low water absorption and wear resistance as claimed in claim 2, is characterized in that: the weight of the nano silicon dioxide or nano ceramic micro powder is 2-4% of that of nylon 6, and the weight of the nano calcium carbonate is 1-7% of that of the nylon 6.
4. The method for preparing the nylon bushing with low water absorption and wear resistance as claimed in claim 3, wherein the nylon bushing is characterized in that: the weight of the nano silicon dioxide or nano ceramic micro powder is 3 percent of that of nylon 6, and the weight of the nano calcium carbonate is 5 percent of that of the nylon 6.
5. The method for preparing the nylon bushing with low water absorption and wear resistance as claimed in claim 3, wherein the nylon bushing is characterized in that: the weight of PTFE is 15-16% of that of nylon 6.
6. The low water absorption abrasion-resistant nylon bushing, which is prepared by the preparation method of the low water absorption abrasion-resistant nylon bushing according to any claim 1-5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110109314.5A CN112831179B (en) | 2021-01-26 | 2021-01-26 | Low-water-absorption wear-resistant nylon bushing and preparation method thereof |
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| CN202110109314.5A CN112831179B (en) | 2021-01-26 | 2021-01-26 | Low-water-absorption wear-resistant nylon bushing and preparation method thereof |
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| CN112831179A true CN112831179A (en) | 2021-05-25 |
| CN112831179B CN112831179B (en) | 2023-06-13 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080206559A1 (en) * | 2007-02-26 | 2008-08-28 | Yunjun Li | Lubricant enhanced nanocomposites |
| CN104710785A (en) * | 2015-03-31 | 2015-06-17 | 长沙五犇新材料科技有限公司 | Low-water-absorption and wear-resistant composite nylon as well as preparation method and application thereof |
| CN106751765A (en) * | 2017-03-08 | 2017-05-31 | 株洲时代新材料科技股份有限公司 | A kind of wear-resisting High impact nylon composite and its preparation method and application |
| CN110128820A (en) * | 2019-04-13 | 2019-08-16 | 上海瀚通汽车零部件有限公司 | A kind of timing chain guide rail and its preparation process |
-
2021
- 2021-01-26 CN CN202110109314.5A patent/CN112831179B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080206559A1 (en) * | 2007-02-26 | 2008-08-28 | Yunjun Li | Lubricant enhanced nanocomposites |
| CN104710785A (en) * | 2015-03-31 | 2015-06-17 | 长沙五犇新材料科技有限公司 | Low-water-absorption and wear-resistant composite nylon as well as preparation method and application thereof |
| CN106751765A (en) * | 2017-03-08 | 2017-05-31 | 株洲时代新材料科技股份有限公司 | A kind of wear-resisting High impact nylon composite and its preparation method and application |
| CN110128820A (en) * | 2019-04-13 | 2019-08-16 | 上海瀚通汽车零部件有限公司 | A kind of timing chain guide rail and its preparation process |
Non-Patent Citations (1)
| Title |
|---|
| 李湘湘等: "聚酰胺摩擦学研究进展", 《润滑与密封》 * |
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