CN111690163B - Surface treatment method for self-lubricating polyacetal product - Google Patents
Surface treatment method for self-lubricating polyacetal product Download PDFInfo
- Publication number
- CN111690163B CN111690163B CN202010423899.3A CN202010423899A CN111690163B CN 111690163 B CN111690163 B CN 111690163B CN 202010423899 A CN202010423899 A CN 202010423899A CN 111690163 B CN111690163 B CN 111690163B
- Authority
- CN
- China
- Prior art keywords
- treatment
- polyacetal
- plasma
- product
- minutes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/12—Chemical modification
- C08J7/123—Treatment by wave energy or particle radiation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/12—Chemical modification
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2359/00—Characterised by the use of polyacetals containing polyoxymethylene sequences only
Abstract
The invention provides a self-lubricating polyacetal product and a surface treatment method thereof, wherein the surface treatment method of the polyacetal product comprises the steps of drying treatment, plasma treatment, heat treatment and cooling treatment of the surface of the polyacetal product, and the sliding property of the surface of the polyacetal product is greatly improved. The plasma treatment improves the molecular structure of the outer surface layer of the polyacetal product, and increases the proportion of non-high-temperature crystallization parts and non-crystallization parts; the heat treatment reforms the molecular chain of the polyacetal, eliminates stress and enhances the self-lubricating property of the surface of the polyacetal product. The invention can greatly improve the sliding property of the polyacetal product by simple surface treatment without blending modification of the polyacetal resin, thereby greatly widening the application scene of the polyacetal.
Description
Technical Field
The present invention belongs to the field of polymer material technology, and is especially the surface treatment process of self-lubricating polyacetal product.
Background
Polyacetal is a thermoplastic crystalline engineering plastic with no side chain and excellent comprehensive performance, has high rigidity and high fatigue resistance, and is often used for manufacturing transmission parts such as gears, slide rails and the like in the mechanical field. The polyacetal has certain self-lubricating property due to the special C-O main chain structure, but the untreated polyacetal product has a large surface friction coefficient, easily generates unpleasant sliding friction sound, influences the wear resistance and self-lubricating property of the surface of the product, and limits the application of the polyacetal in certain fields with strict and high-precision requirements.
In order to enhance the self-lubricating property of polyacetal resin, the skilled person has developed many modifications, such as blending polyacetal resin with a lubricant such as polytetrafluoroethylene, graphite, silicone oil, etc. The patent application CN108752852A discloses a high-wear-resistance high-self-lubricating polyformaldehyde resin material and a preparation method thereof, wherein molybdenum disulfide and low-molecular-weight polytetrafluoroethylene are used as lubricating additives, and polyacetal and thermoplastic polyurethane are mixed in a double-screw extruder to obtain the high-wear-resistance high-self-lubricating polyformaldehyde resin. Patent application CN102675819A discloses a wear-resistant self-lubricating polyformaldehyde and a preparation method thereof, wherein polyacetal resin, polytetrafluoroethylene micro powder and inorganic nano particles are blended and extruded to enhance the self-lubricating property of the polyacetal resin. At present, modification of polyacetal resin by adding an auxiliary agent is still insufficient in two aspects: firstly, the surface self-lubricating property of a polyacetal product processed by utilizing polyacetal resin is still insufficient; ② the assistant has poor dispersibility in the polyacetal resin, which leads to unstable self-lubricating and wear-resisting properties and fluctuation of the quality of the product batch.
Although there are many works for self-lubricating modification of polyacetal resin, there have been few reports on the treatment of the surface of articles obtained by processing polyacetal resin to enhance the self-lubricating property thereof.
Disclosure of Invention
The invention aims to provide a self-lubricating polyacetal product and a surface treatment method thereof. The present invention has been found for the first time that the self-lubricity of the surface of the polyacetal article can be greatly improved and the wear resistance thereof can be enhanced after the surface of the polyacetal article after molding is subjected to the drying treatment, the plasma treatment, the heat treatment and the cooling treatment in this order, and the squeak noise caused by friction can be avoided.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a self-lubricating polyacetal article and a surface treatment method thereof, comprising the steps of:
a drying step S1 of drying the polyacetal article;
a plasma treatment step S2 of subjecting the surface of the polyacetal article to a plasma treatment;
a heat treatment step S3 of heat-treating the polyacetal articles after the plasma treatment;
and a cooling step S4 of naturally cooling the heat-treated polyacetal article to room temperature to crystallize the polyacetal, thereby obtaining the self-lubricating polyacetal article.
Further, the treatment temperature in the drying process is 80-130 ℃, preferably 90-120 ℃; the time is 1-3 hours.
Further, in the plasma treatment process, the vacuum degree of the plasma treatment cavity is 2-100Pa, preferably 5-30 Pa; the plasma atmosphere is argon atmosphere, oxygen atmosphere or mixed atmosphere of oxygen and argon, preferably argon; the gas flow rate is 5-100 ml/min, preferably 5-50 ml/min. The plasma excitation power is 100-500W, preferably 100-300W; the treatment time is 2 to 10 minutes, preferably 2 to 5 minutes.
Further, the heat treatment step S3 is a thermal annealing step or a hot pressing step, and is preferably a thermal annealing step.
Further, in the thermal annealing treatment process, the vacuum degree of the thermal annealing treatment cavity is 2-100Pa, preferably 5-50 Pa; the atmosphere in the cavity is nitrogen or inert gas atmosphere. The heat treatment temperature is 100-130 ℃; the thermal annealing time is 2 to 20 minutes, preferably 2 to 10 minutes.
Further, in the hot pressing step, the pressure of the hot pressing treatment on the polyacetal articles after the plasma treatment is 0.2 to 1MPa, preferably 0.2 to 0.5 MPa. The hot-pressing treatment temperature is 100-130 ℃; the duration of the autoclaving is 2 to 20 minutes, preferably 2 to 10 minutes.
The invention also relates to a self-lubricating polyacetal product obtained by the surface treatment method.
The present invention is suitable for polyacetal articles obtained by processing various polyacetal resins, since the surface of the polyacetal article is simply treated to remarkably improve the sliding characteristics. The polyacetal itself has a self-lubricating property because the non-crystallized portion of the polyacetal is concentrated outside the spherulite crystal, and the non-crystallized portion has a glass transition temperature of-50 ℃, is extremely soft, and has a lubricating effect, thereby reducing friction and loss. The surface of the polyacetal product is subjected to plasma treatment, so that the molecular structure of the outer surface layer of the polyacetal product can be improved, and the proportion of non-high-temperature crystallization parts and non-crystallization parts in the polyacetal product is increased; the heat treatment process can reform the molecular chains and eliminate stress, thereby enhancing the self-lubricating property of the surface of the polyacetal product. The drying treatment before the plasma treatment can eliminate the internal stress on the surface of the product and enhance the interaction between the plasma and the surface of the product; the plasma is immediately subjected to heat treatment, so that the molecular chain of the non-crystalline part with the lubricating effect can be effectively reformed, and the purpose of improving the surface self-lubrication of the product is achieved after cooling treatment. Therefore, the drying treatment, the plasma treatment, the heat treatment and the cooling treatment are sequentially performed on the polyacetal product, so that the self-lubricity of the surface of the polyacetal product can be scientifically and effectively improved.
The invention has the following gain effects:
(1) the invention does not need to carry out blending modification on polyacetal resin, can greatly improve the lubricity of the surface of a polyacetal product only by simple surface treatment, and expands the application scene of the polyacetal;
(2) the base resin does not need to be modified, only the polyacetal product is treated, the operation is simple and convenient, and the development and the application in specific scenes are facilitated;
(3) the polyacetal products after the surface treatment of the invention have small difference in mechanical properties from those before the surface treatment, and can be replaced under the same conditions.
Detailed Description
The following examples will further illustrate the method provided by the present invention, but the present invention is not limited to the examples listed, but also includes any other known variations within the scope of the claims of the present invention, the specific application of the present invention is not limited to the examples described, and the simple modifications to the concept of the present invention which can be applied by those skilled in the art are within the scope of the claims of the present invention.
Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
The present invention will be further described with reference to the following examples. It should be understood that the following examples are illustrative only and are not intended to limit the scope of the present invention.
Commercially available polyacetal resins are available from KEP company under the trade designation: KEP F20-03 with a melt flow rate of 9g/10min at 190 ℃ under a load of 2.16 kg;
the cylindrical polyacetal sliding article was prepared by ordinary injection molding KEP F02-03 at 190 ℃ using an injection molding machine (manufactured by Haitian corporation, model: Long Fei Asia VEII) through a prescribed mold.
In the present example, the evaluation methods of the load resistance, squeak and sliding properties of the polyacetal articles were as follows:
using a Suzuki friction abrasion tester (cylindrical end contact thrust type), the load was measured by "load 10kgf/cm2Sliding speed 1m/min "initial conditions begin to slide, increasing by 2kgf/cm every 5 minutes2The load reaches an accumulated load of 30kgf/cm2The load of (2) is a primary load before reaching the load as a limit load. The larger the value of the load value is, the more excellent the load resistance is, and the noise judgment factor is that no creak occurs.
The friction coefficient indicates the friction coefficient at the time of extreme load, and the wear is expressed as the amount of dimensional change before and after the test. The dimensions of the shapes of the test pieces, the wear pieces and the test methods are shown in Table 1.
Table 1 shape and dimensions of example objects, wearing objects and test methods
Example one
(1) A commercially available polyacetal resin was injection-molded to obtain a cylindrical sliding article shown in Table 1;
(2) drying the polyacetal product at 80 ℃ for 3 hours;
(3) putting the dried polyacetal product into a sputtering cavity of magnetron sputtering equipment (model: MSP-3100, manufactured by Wennake technologies, Inc., Beijing) for plasma treatment, wherein the vacuum degree of the cavity is 2Pa, the plasma atmosphere is argon atmosphere, the gas flow is 5 ml/min, the plasma excitation power is 100W, and the treatment time is 2 minutes;
(4) putting the polyacetal product subjected to the plasma treatment into a rapid annealing furnace for thermal annealing treatment, wherein the vacuum degree of a cavity is 2Pa, the atmosphere in the cavity is nitrogen, the thermal treatment temperature is 100 ℃, and the treatment time is 2 minutes;
(5) and naturally cooling the polyacetal product subjected to the thermal annealing treatment to room temperature to obtain the target self-lubricating polyacetal product.
(6) The objective polyacetal articles were subjected to analysis tests for load resistance, squeak and sliding characteristics, and the results are shown in Table 4.
Example two
(1) A commercially available polyacetal resin was injection-molded to obtain a cylindrical sliding article shown in Table 1;
(2) drying the polyacetal articles at 90 ℃ for a period of time: 3 hours;
(3) putting the dried polyacetal product into a sputtering cavity of magnetron sputtering equipment (model: MSP-3100, manufactured by Wehne technologies, Inc., of Beijing) for plasma treatment, wherein the vacuum degree of the cavity is 100Pa, the plasma atmosphere is an oxygen atmosphere, the gas flow is 50 ml/min, the plasma excitation power is 500W, and the treatment time is 3 minutes;
(4) putting the polyacetal products after the plasma treatment into a rapid annealing furnace for thermal annealing treatment, wherein the vacuum degree of a cavity is 100Pa, the atmosphere in the cavity is argon, the thermal treatment temperature is 130 ℃, and the treatment time is 5 minutes;
(5) and naturally cooling the polyacetal product subjected to the thermal annealing treatment to room temperature to obtain the target self-lubricating polyacetal product.
(6) The objective polyacetal articles were subjected to the analysis tests for load resistance, squeak and sliding characteristics, and the results are shown in Table 4.
EXAMPLE III
(1) A commercially available polyacetal resin was injection-molded to obtain a cylindrical sliding article shown in Table 1;
(2) drying the polyacetal articles at 100 ℃ for a period of time: 2 hours;
(3) putting the dried polyacetal product into a sputtering cavity of magnetron sputtering equipment (model: MSP-3100, manufactured by Wehne technologies, Inc., of Beijing) for plasma treatment, wherein the vacuum degree of the cavity is 5Pa, the plasma atmosphere is argon atmosphere, the gas flow is 30 ml/min, the plasma excitation power is 200W, and the treatment time is 3 minutes;
(4) putting the polyacetal product subjected to the plasma treatment into a rapid annealing furnace for thermal annealing treatment, wherein the vacuum degree of a cavity is 5Pa, the atmosphere in the cavity is nitrogen, the thermal treatment temperature is 120 ℃, and the treatment time is 5 minutes;
(5) and naturally cooling the polyacetal product subjected to the thermal annealing treatment to room temperature to obtain the target self-lubricating polyacetal product.
(6) The objective polyacetal articles were subjected to the analysis tests for load resistance, squeak and sliding characteristics, and the results are shown in Table 4.
Example four
(1) A commercially available polyacetal resin was injection-molded to obtain a cylindrical sliding article as shown in Table 1;
(2) drying the polyacetal articles at 120 ℃ for a period of time: 1 hour;
(3) putting the dried polyacetal product into a sputtering cavity of magnetron sputtering equipment (model: MSP-3100, manufactured by Wehne technologies, Inc., of Beijing) for plasma treatment, wherein the vacuum degree of the cavity is 30Pa, the plasma atmosphere is an oxygen atmosphere, the gas flow is 100 ml/min, the plasma excitation power is 300W, and the treatment time is 5 minutes;
(4) putting the polyacetal product subjected to the plasma treatment into a rapid annealing furnace for thermal annealing treatment, wherein the vacuum degree of a cavity is 50Pa, the atmosphere in the cavity is argon, the thermal treatment temperature is 120 ℃, and the treatment time is 10 minutes;
(5) and naturally cooling the polyacetal product subjected to the thermal annealing treatment to room temperature to obtain the target self-lubricating polyacetal product.
(6) The objective polyacetal articles were subjected to analysis tests for load resistance, squeak and sliding characteristics, and the results are shown in Table 4.
EXAMPLE five
(1) A commercially available polyacetal resin was injection-molded to obtain a cylindrical sliding article shown in Table 1;
(2) drying the polyacetal articles at 130 ℃ for a period of time: 1 hour;
(3) putting the dried polyacetal product into a sputtering cavity of magnetron sputtering equipment (model: MSP-3100, manufactured by Wehne technologies, Inc. of Beijing) for plasma treatment, wherein the vacuum degree of the cavity is 20Pa, the plasma atmosphere is a mixed atmosphere of oxygen and argon (the flow ratio of the oxygen to the argon is 1: 1), the gas flow is 50 ml/min, the plasma excitation power is 200W, and the treatment time is 10 minutes;
(4) putting the polyacetal product subjected to the plasma treatment into a rapid annealing furnace for thermal annealing treatment, wherein the vacuum degree of a cavity is 30Pa, the atmosphere in the cavity is nitrogen, the thermal treatment temperature is 130 ℃, and the treatment time is 20 minutes;
(5) and cooling the polyacetal product subjected to the thermal annealing treatment to room temperature to obtain the target self-lubricating polyacetal product.
(6) The objective polyacetal articles were subjected to analysis tests for load resistance, squeak and sliding characteristics, and the results are shown in Table 4.
EXAMPLE six
(1) A commercially available polyacetal resin was injection-molded to obtain a cylindrical sliding article shown in Table 1;
(2) drying the polyacetal articles at 110 ℃ for a period of time: 2 hours;
(3) putting the dried polyacetal product into a sputtering cavity of magnetron sputtering equipment (model: MSP-3100, manufactured by Wehne technologies, Inc., of Beijing) for plasma treatment, wherein the vacuum degree of the cavity is 2Pa, the plasma atmosphere is argon atmosphere, the gas flow is 5 ml/min, the plasma excitation power is 100W, and the treatment time is 2 minutes;
(4) carrying out hot pressing treatment on the polyacetal product subjected to the plasma treatment, wherein the surface pressure of the hot pressing treatment is 0.2Mpa, the hot pressing temperature is 100 ℃, and the hot pressing treatment time is 2 minutes;
(5) and naturally cooling the polyacetal product subjected to the hot pressing treatment to room temperature to obtain the target self-lubricating polyacetal product.
(6) The objective polyacetal articles were subjected to analysis tests for load resistance, squeak and sliding characteristics, and the results are shown in Table 4.
EXAMPLE seven
(1) A commercially available polyacetal resin was injection-molded to obtain a cylindrical sliding article shown in Table 1;
(2) drying the polyacetal articles at 90 ℃ for a period of time: 2 hours;
(3) putting the dried polyacetal product into a sputtering cavity of magnetron sputtering equipment (model: MSP-3100, manufactured by Wennake technologies, Inc., Beijing) for plasma treatment, wherein the vacuum degree of the cavity is 100Pa, the plasma atmosphere is an oxygen atmosphere, the gas flow is 50 ml/min, the plasma excitation power is 500W, and the treatment time is 3 minutes;
(4) carrying out hot pressing treatment on the polyacetal product subjected to the plasma treatment, wherein the surface pressure of the hot pressing treatment is 0.5Mpa, the hot pressing temperature is 120 ℃, and the hot pressing treatment time is 5 minutes;
(5) and naturally cooling the polyacetal product subjected to the hot pressing treatment to room temperature to obtain the target self-lubricating polyacetal product.
(6) The objective polyacetal articles were subjected to the analysis tests for load resistance, squeak and sliding characteristics, and the results are shown in Table 4.
Example eight
(1) A commercially available polyacetal resin was injection-molded to obtain a cylindrical sliding article shown in Table 1;
(2) drying the polyacetal articles at 100 ℃ for a period of time: 2 hours;
(3) putting the dried polyacetal product into a sputtering cavity of magnetron sputtering equipment (model: MSP-3100, manufactured by Wehne technologies, Inc., of Beijing) for plasma treatment, wherein the vacuum degree of the cavity is 5Pa, the plasma atmosphere is argon atmosphere, the gas flow is 30 ml/min, the plasma excitation power is 200W, and the treatment time is 5 minutes;
(4) carrying out hot pressing treatment on the polyacetal product subjected to the plasma treatment, wherein the surface pressure of the hot pressing treatment is 0.3Mpa, the hot pressing temperature is 120 ℃, and the hot pressing treatment time is 5 minutes;
(5) and naturally cooling the polyacetal product subjected to the hot pressing treatment to room temperature to obtain the target self-lubricating polyacetal product.
(6) The objective polyacetal articles were subjected to the analysis tests for load resistance, squeak and sliding characteristics, and the results are shown in Table 4.
Example nine
(1) A commercially available polyacetal resin was injection-molded to obtain a cylindrical sliding article shown in Table 1;
(2) drying the polyacetal articles at 100 ℃ for a period of time: 2 hours;
(3) putting the dried polyacetal product into a sputtering cavity of magnetron sputtering equipment (model: MSP-3100, manufactured by Wehne technologies, Inc., of Beijing) for plasma treatment, wherein the vacuum degree of the cavity is 30Pa, the plasma atmosphere is an oxygen atmosphere, the gas flow is 100 ml/min, the plasma excitation power is 300W, and the treatment time is 5 minutes;
(4) carrying out hot pressing treatment on the polyacetal product subjected to the plasma treatment, wherein the surface pressure of the hot pressing treatment is 1Mpa, the hot pressing temperature is 130 ℃, and the hot pressing treatment time is 10 minutes;
(5) and naturally cooling the polyacetal product subjected to the hot pressing treatment to room temperature to obtain the target self-lubricating polyacetal product.
(6) The objective polyacetal articles were subjected to analysis tests for load resistance, squeak and sliding characteristics, and the results are shown in Table 4.
Example ten
(1) A commercially available polyacetal resin was injection-molded to obtain a cylindrical sliding article shown in Table 1;
(2) drying the polyacetal articles at 120 ℃ for a period of time: 1 hour;
(3) putting the dried polyacetal product into a sputtering cavity of magnetron sputtering equipment (model: MSP-3100, manufactured by Wehne technologies, Inc. of Beijing) for plasma treatment, wherein the vacuum degree of the cavity is 20Pa, the plasma atmosphere is a mixed atmosphere of oxygen and argon (the flow ratio of the oxygen to the argon is 1: 1), the gas flow is 50 ml/min, the plasma excitation power is 200W, and the treatment time is 10 minutes;
(4) carrying out hot pressing treatment on the polyacetal product subjected to the plasma treatment, wherein the surface pressure of the hot pressing treatment is 0.5Mpa, the hot pressing temperature is 130 ℃, and the hot pressing treatment time is 20 minutes;
(5) and naturally cooling the polyacetal product subjected to the hot pressing treatment to room temperature to obtain the target self-lubricating polyacetal product.
(6) The objective polyacetal articles were subjected to analysis tests for load resistance, squeak and sliding characteristics, and the results are shown in Table 4.
Comparative example 1
(1) A commercially available polyacetal resin was injection-molded to obtain a cylindrical sliding article as shown in Table 1;
(2) drying the polyacetal articles at 100 ℃ for a period of time: 2 hours;
(3) and naturally cooling the dried polyacetal product to room temperature to obtain the target polyacetal product.
(4) The polyacetal articles were subjected to analysis tests for load resistance, squeak and sliding characteristics, and the results are shown in Table 4.
Comparative example No. two
(1) A commercially available polyacetal resin was injection-molded to obtain a cylindrical sliding article shown in Table 1;
(2) drying the polyacetal articles at 100 ℃ for a period of time: 2 hours;
(3) putting the dried polyacetal product into a rapid annealing furnace for thermal annealing treatment, wherein the vacuum degree of a cavity is 5Pa, the atmosphere in the cavity is nitrogen, the thermal treatment temperature is 120 ℃, and the treatment time is 5 minutes;
(4) and naturally cooling the polyacetal product subjected to the thermal annealing treatment to room temperature to obtain the target polyacetal product.
(5) The polyacetal articles were subjected to analysis tests for load resistance, squeak and sliding characteristics, and the results are shown in Table 4.
Comparative example No. three
(1) A commercially available polyacetal resin was injection-molded to obtain a cylindrical sliding article shown in Table 1;
(2) drying the polyacetal articles at 90 ℃ for a period of time: 2 hours;
(3) carrying out hot pressing treatment on the dried polyacetal product, wherein the surface pressure of the hot pressing treatment is 0.5Mpa, the hot pressing temperature is 120 ℃, and the hot pressing treatment time is 5 minutes;
(4) and naturally cooling the polyacetal product subjected to the hot pressing treatment to room temperature to obtain the target polyacetal product.
(5) The objective polyacetal articles were subjected to analysis tests for load resistance, squeak and sliding characteristics, and the results are shown in Table 4.
Comparative example No. four
(1) A commercially available polyacetal resin was injection-molded to obtain a cylindrical sliding article shown in Table 1;
(2) drying the polyacetal articles at 100 ℃ for a period of time: 2 hours;
(3) putting the dried polyacetal product into a sputtering cavity of magnetron sputtering equipment (model: MSP-3100, manufactured by Wehne technologies, Inc., of Beijing) for plasma treatment, wherein the vacuum degree of the cavity is 5Pa, the plasma atmosphere is argon atmosphere, the gas flow is 30 ml/min, the plasma excitation power is 200W, and the treatment time is 3 minutes;
(4) naturally cooling the polyacetal product treated by the plasma to room temperature to obtain the target polyacetal product.
(5) The objective polyacetal articles were subjected to analysis tests for load resistance, squeak and sliding characteristics, and the results are shown in Table 4.
TABLE 2 comparison of treatment conditions for the examples
Table 3 comparison of treatment conditions of comparative examples
TABLE 4 comparison of sliding characteristics of examples and comparative examples
As is clear from tables 2, 3 and 4, the polyacetal articles obtained by the treatments under different conditions in examples 1 to 10 are remarkably improved in the ultimate load and the coefficient of friction, and are remarkably improved in the sliding property without generating the squeaking sound, compared with the untreated comparative example 1. As is clear from comparison with the sliding characteristics of comparative examples 2 to 4, the sliding characteristics of the polyacetal articles could not be effectively improved by only subjecting the polyacetal articles to the plasma treatment or only subjecting the polyacetal articles to the heat treatment.
As described above, the surface treatment method of the present invention can effectively improve the sliding characteristics of the polyacetal articles without generating squeaking. The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and additions can be made without departing from the method of the present invention, and these modifications and additions should also be regarded as the protection scope of the present invention.
Claims (14)
1. A method for surface treatment of a self-lubricating polyacetal article, comprising the steps of:
a drying step S1 of drying the polyacetal resin article;
a plasma treatment step S2 of subjecting the surface of the polyacetal article to a plasma treatment; the vacuum degree of the plasma processing cavity is 2-100Pa, the plasma atmosphere is argon atmosphere, oxygen atmosphere or mixed atmosphere of oxygen and argon,
a heat treatment step S3 of heat-treating the polyacetal articles after the plasma treatment; the heat treatment is a thermal annealing treatment process or a hot pressing treatment process, the vacuum degree of a thermal annealing treatment cavity is 2-100Pa, and the thermal annealing treatment temperature is 100-130 ℃; the pressure of the hot-pressing treatment is 0.2-1MPa, and the temperature of the hot-pressing treatment is 100-;
and a cooling step S4 of cooling the heat-treated polyacetal article to room temperature to crystallize the heat-treated polyacetal article to obtain the self-lubricating polyacetal article.
2. The method of claim 1, wherein: the drying temperature in the drying procedure S1 is 80-130 ℃, and the time is 1-3 hours.
3. The method of claim 2, wherein: the drying temperature in the drying step S1 is 90-120 ℃.
4. The method according to any one of claims 1-3, wherein: in the plasma processing step S2, the vacuum degree of the plasma processing cavity is 5-30 Pa; the gas flow rate is 5-100 ml/min.
5. The method of claim 4, wherein: the gas flow rate is 5-50 ml/min.
6. The method of claim 4, wherein: the plasma excitation power is 100-500W; the treatment time is 2-10 minutes.
7. The method of claim 6, wherein: the plasma excitation power is 100-300W; the treatment time is 2-5 minutes.
8. The method according to any one of claims 1-3, wherein: the heat treatment step S3 is a thermal annealing treatment step.
9. The method of claim 1, wherein: in the thermal annealing treatment process, the vacuum degree of a thermal annealing treatment cavity is 5-50 Pa; the atmosphere in the cavity is nitrogen or inert gas atmosphere except nitrogen.
10. The method according to claim 1 or 9, characterized in that: the thermal annealing time is 2-20 minutes.
11. The method of claim 10, wherein: the thermal annealing time is 2-10 minutes.
12. The method of claim 1, wherein: in the hot pressing step, the pressure of the hot pressing treatment on the polyacetal products after the plasma treatment is 0.2-0.5MPa, and the time of the hot pressing treatment is 2-20 minutes.
13. The method of claim 12, wherein: the hot pressing time is 2-10 minutes.
14. A polyacetal article obtainable by the process of any one of claims 1 to 13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010423899.3A CN111690163B (en) | 2020-05-19 | 2020-05-19 | Surface treatment method for self-lubricating polyacetal product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010423899.3A CN111690163B (en) | 2020-05-19 | 2020-05-19 | Surface treatment method for self-lubricating polyacetal product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111690163A CN111690163A (en) | 2020-09-22 |
| CN111690163B true CN111690163B (en) | 2022-07-12 |
Family
ID=72477095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010423899.3A Active CN111690163B (en) | 2020-05-19 | 2020-05-19 | Surface treatment method for self-lubricating polyacetal product |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111690163B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4560458A (en) * | 1983-01-31 | 1985-12-24 | Shin-Etsu Chemical Co., Ltd. | Method for improving surface properties of a shaped article of a synthetic resin |
| JPH02307575A (en) * | 1989-05-22 | 1990-12-20 | Polyplastics Co | Surface treatment for coating polyacetal resin molding |
| JP2012116883A (en) * | 2010-11-29 | 2012-06-21 | Polyplastics Co | Polyacetal resin composition |
| JP2017095534A (en) * | 2015-11-18 | 2017-06-01 | 旭化成株式会社 | Polyacetal resin composition molding, laminate resin molding, and method for producing polyacetal resin composition molding |
-
2020
- 2020-05-19 CN CN202010423899.3A patent/CN111690163B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4560458A (en) * | 1983-01-31 | 1985-12-24 | Shin-Etsu Chemical Co., Ltd. | Method for improving surface properties of a shaped article of a synthetic resin |
| JPH02307575A (en) * | 1989-05-22 | 1990-12-20 | Polyplastics Co | Surface treatment for coating polyacetal resin molding |
| JP2012116883A (en) * | 2010-11-29 | 2012-06-21 | Polyplastics Co | Polyacetal resin composition |
| JP2017095534A (en) * | 2015-11-18 | 2017-06-01 | 旭化成株式会社 | Polyacetal resin composition molding, laminate resin molding, and method for producing polyacetal resin composition molding |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111690163A (en) | 2020-09-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4110391A (en) | Process for the manufacture of molded articles from polyolefins with molecular weights of at least one million | |
| CN111073239A (en) | High-temperature-resistant polylactic acid injection-molded porcelain-like tableware and preparation method thereof | |
| CN110835442B (en) | Polypropylene/polyamide/polyketone composite material and preparation method thereof | |
| CN111690163B (en) | Surface treatment method for self-lubricating polyacetal product | |
| CN115322479B (en) | Low-post-shrinkage polypropylene material and preparation method thereof | |
| EP1215409A2 (en) | Material for bearing retainer | |
| CN104277459A (en) | Polyphenylene sulfide/semi-aromatic nylon composite material and preparation method thereof | |
| CN111117221A (en) | Low-water-absorption composite material and preparation method thereof | |
| CN113372708B (en) | High-heat-resistant high-humidity self-lubricating polyketone composition and application thereof | |
| CN108285609B (en) | High melt strength styrene resin composition and preparation method thereof | |
| CN107304271B (en) | Polypropylene-based composite material and preparation method and application thereof | |
| CN103706741A (en) | Hot forging and molding process for oxygen free copper material | |
| JP3849118B2 (en) | Powder metallurgy and sintered metal bodies | |
| CN111909511B (en) | High-wear-resistance heat-conducting nylon composite material and preparation method thereof | |
| CN102115602B (en) | Material composition used for resin vortex disc and resin vortex disc | |
| JPS6345694B2 (en) | ||
| CN114015236A (en) | High-strength and high-wear-resistance carbon fiber reinforced polyphenylene sulfide composite material and preparation method thereof | |
| CN1234764C (en) | Preparation method, of mica filled polytetrafluoro-ethylene product material for acroengine | |
| CN112080146A (en) | Polyimide composite material for bearing retainer, preparation method of polyimide composite material and bearing retainer | |
| CN115091774A (en) | Processing method of modified polytetrafluoroethylene sealing element | |
| CN110885554A (en) | Nylon 66 composite material and preparation method and application thereof | |
| CN113956609B (en) | Wear-resistant antistatic polyether ether ketone based composite material and preparation method and application thereof | |
| CN113881147B (en) | Injection molding grade wear-resistant polypropylene material and preparation method thereof | |
| CN111303600B (en) | Polylactic acid/Zn2+Heat-resistant composite material and preparation method thereof | |
| CN114479245B (en) | Zirconium phosphate tetraphenyltin synergistically modified UHMWPE wear-resistant composite material and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |