CN113402843A - Production formula of wear-resistant plastic - Google Patents
Production formula of wear-resistant plastic Download PDFInfo
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- CN113402843A CN113402843A CN202011386216.8A CN202011386216A CN113402843A CN 113402843 A CN113402843 A CN 113402843A CN 202011386216 A CN202011386216 A CN 202011386216A CN 113402843 A CN113402843 A CN 113402843A
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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
- C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
- C08L61/04—Condensation polymers of aldehydes or ketones with phenols only
- C08L61/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
- C08L61/14—Modified phenol-aldehyde condensates
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- 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
- C08G8/00—Condensation polymers of aldehydes or ketones with phenols only
- C08G8/28—Chemically modified polycondensates
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- 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
- C08J7/04—Coating
- C08J7/06—Coating with compositions not containing macromolecular substances
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- 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
- C08J2361/00—Characterised by the use of condensation polymers of aldehydes or ketones; Derivatives of such polymers
- C08J2361/04—Condensation polymers of aldehydes or ketones with phenols only
- C08J2361/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
- C08J2361/14—Modified phenol-aldehyde condensates
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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
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0856—Iron
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/16—Fibres; Fibrils
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Abstract
The invention provides a production formula of wear-resistant plastic, which is applied to the technical field of plastic manufacturing and comprises phenol, paraformaldehyde, wear-resistant resin, a catalyst, a toughening agent, glass fiber, cotton fiber, micro-iron particles, sodium hydroxide, sodium carbonate, sodium phosphate, coating liquid and distilled water; the mass amount of each component for preparing one part of wear-resistant plastic in the production formula is as follows: 1-2 kg of phenol, 0.05-0.2 kg of paraformaldehyde, 10-20 kg of wear-resistant resin, 20-30 g/l of catalyst, 50-80 g/l of flexibilizer, 1-5 kg of glass fiber, 3-5 kg of cotton fiber, 0.5-2 kg of micro-iron particles, 50-85 g/l of sodium hydroxide, 15-20 g/l of sodium carbonate, 30g/l of sodium phosphate, 40-60 g/l of coating liquid and 100-200 g/l of distilled water, and the novel environment-friendly wear-resistant plastic is prepared by adopting an electromagnetic preheating and optical modification film forming method according to phenolic resin as a main material.
Description
Technical Field
The invention relates to the technical field of plastic manufacturing, in particular to a production formula of wear-resistant plastic.
Background
Three factors need to be considered for manufacturing the wear-resistant plastic, namely an environmental factor, a wear-resistant factor and a resistance factor;
the environment-friendly material firstly saves resources and energy sources, secondly reduces environmental pollution, thirdly is easy to recycle, and the prior mode of preparing the wear-resistant plastic adopts phenol formaldehyde resin (PF) to avoid the problems that the traditional method of preparing PF by using formaldehyde solution needs vacuum pumping for dehydration and free phenol and aldehyde pollute water resources in the synthesis process. The environment-friendly PF can be further synthesized, vacuum dehydration is not needed, time is saved, and energy consumption can be reduced.
The environment-friendly effect is effectively realized by adopting the phenolic resin, but the wear resistance and the electric resistance still need to be improved;
the sol-gel method is adopted at present to modify the surface of the environment-friendly plastic to form a wear-resistant film, so that the problem of wear resistance is solved; and an electromagnetic preheating method is adopted, so that the electrical insulation performance of the environment-friendly plastic is obviously improved.
The production formula of the wear-resistant plastic provided by the invention adopts the phenolic resin as a main material and adopts the methods of electromagnetic preheating and optical modification film forming to prepare the novel environment-friendly wear-resistant plastic.
Disclosure of Invention
The invention provides a production formula of wear-resistant plastic, which is prepared into novel environment-friendly wear-resistant plastic by adopting an electromagnetic preheating and optical modification film forming method according to phenolic resin as a main material.
The invention adopts the following technical means for solving the technical problems:
the invention provides a production formula of wear-resistant plastic, which comprises phenol, paraformaldehyde, wear-resistant resin, a catalyst, a toughening agent, glass fiber, cotton fiber, micro-iron particles, sodium hydroxide, sodium carbonate, sodium phosphate, coating liquid and distilled water;
the mass amount of each component for preparing one part of wear-resistant plastic in the production formula is as follows:
1-2 kg of phenol, 0.05-0.2 kg of paraformaldehyde, 10-20 kg of wear-resistant resin, 20-30 g/l of catalyst, 50-80 g/l of toughening agent, 1-5 kg of glass fiber, 3-5 kg of cotton fiber, 0.5-2 kg of micro-iron particles, 50-85 g/l of sodium hydroxide, 15-20 g/l of sodium carbonate, 30g/l of sodium phosphate, 40-60 g/l of coating liquid and 100-200 g/l of distilled water.
Further, the mass amount of each component for preparing a part of wear-resistant plastic in the production formula is as follows: 1kg of phenol, 0.2kg of paraformaldehyde, 15kg of wear-resistant resin, 30g/l of catalyst, 80g/l of toughening agent, 5kg of glass fiber, 5kg of cotton fiber, 1kg of micro-iron particles, 60g/l of sodium hydroxide, 20g/l of sodium carbonate, 30g/l of sodium phosphate, 60g/l of coating liquid and 100g/l of distilled water.
Furthermore, the wear-resistant resin is composed of one or more of PPS resin, ABS resin and fluorinated ethylene resin.
Furthermore, the toughening agent is composed of thermoplastic polyurethane, acrylate, styrene and an antioxidant.
Further, the coating liquid is prepared by processing a self-made liquid, Tetraethoxysilane (TEOS), tetrabutyl titanate (TEOT), tetrahydrofuran and ethyl acetate, wherein the self-made liquid is prepared by mixing sodium hydroxide, sodium carbonate and sodium phosphate with distilled water;
the first dosage of each component of the coating liquid is as follows:
6.20g of Tetraethoxysilane (TEOS), 14.2g of self-made liquid and 30g of tetrahydrofuran and/or ethyl acetate are used for preparing first coating liquid;
the second dosage of each component of the coating liquid is as follows:
6.20g of tetraethyl orthosilicate (TEOS), 3.72g of tetrabutyl titanate (TEOT), 12.4g of a self-made solution, and 30g of tetrahydrofuran and/or ethyl acetate were used to prepare a second coating solution.
Further, the wear-resistant plastic is prepared by adopting a wear-resistant plastic production method corresponding to the wear-resistant plastic production formula, and the wear-resistant plastic production method comprises the following steps:
putting phenol, paraformaldehyde, wear-resistant resin and a catalyst into a reaction kettle for copolycondensation reaction for 30 min;
step two, opening a cover body of the reaction kettle after the copolycondensation reaction, and putting the toughening agent into the reaction kettle for blending for 10 min;
thirdly, putting the glass fiber, the cotton fiber and the micro-iron particles into a reaction kettle for blending for 5 min;
taking the coarse material out of the reaction kettle, and carrying out impregnation, drying and cutting;
fifthly, putting each cut coarse material into an electromagnetic compression molding device, and performing electromagnetic preheating to obtain a non-modified film plastic body;
taking out the non-modified film plastic bodies from the electromagnetic compression molding device, and coating to prepare wear-resistant plastic;
and seventhly, testing the wear resistance and the electrical insulation of the wear-resistant plastic.
Further, in the fifth step of the method for producing wear-resistant plastics, the electromagnetic preheating mode comprises the following steps:
the electromagnetic compression molding device consists of a cylindrical shell and a plastic molding plate, wherein two magnetic plates for the electromagnetic compression molding plate are arranged on the inner side wall of the cylindrical shell, and the magnetic plates are electrified and roll and rotate along the inner side wall of the cylindrical shell, so that a plastic body without a modified film placed on the plastic molding plate is subjected to the action of an electromagnetic field;
in the process of die pressing, the plastic body without the modified film performs electromagnetic field action, and micro iron ions in the plastic body are conducted by magnetic conduction to generate heat, so that electromagnetic preheating is realized.
Further, in the process of the sixth step of the method for producing wear-resistant plastics, the coating mode comprises:
placing the first coating liquid or the second coating liquid into a small measuring cylinder, and controlling the liquid level at 70 mm;
slowly dripping the first coating liquid or the second coating liquid in the small measuring cylinder on the plastic body without the modified film, soaking for 1min, then slowly lifting and putting into a purifier to volatilize the coating liquid;
and (3) putting the non-modified film plastic body after the coating liquid is volatilized into a baking oven, gradually heating to 120 ℃/min from 2 ℃/min, and keeping for 2h to prepare the wear-resistant plastic.
Further, if the first coating liquid is dropped on the non-modified film plastic body, the wear-resistant plastic containing the silicon film is prepared; and if the second coating liquid is dropped on the plastic body without the modified film, the wear-resistant plastic containing the silicon-titanium film is prepared.
The invention provides a production formula of wear-resistant plastic, which has the following beneficial effects:
(1) the method is suitable for electromagnetic preheating, and the electrical insulation, the compression strength, the tensile strength and the bending strength of the phenolic plastic are obviously improved;
(2) the degradation is facilitated, and the recovery is convenient;
(3) the surface friction force is strong, and the scratch resistance is strong.
Drawings
FIG. 1 is a schematic flow chart of a production method of one embodiment of the wear-resistant plastic production formula of the invention.
The implementation, functional features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to the attached fig. 1, a schematic process flow diagram of the wear-resistant plastic production method using the wear-resistant plastic production formula according to an embodiment of the present invention is shown;
a production formula of wear-resistant plastic comprises phenol, paraformaldehyde, wear-resistant resin, a catalyst, a toughening agent, glass fiber, cotton fiber, micro-iron particles, sodium hydroxide, sodium carbonate, sodium phosphate, coating liquid and distilled water;
the mass amount of each component for preparing one part of wear-resistant plastic in the production formula is as follows:
1-2 kg of phenol, 0.05-0.2 kg of paraformaldehyde, 10-20 kg of wear-resistant resin, 20-30 g/l of catalyst, 50-80 g/l of toughening agent, 1-5 kg of glass fiber, 3-5 kg of cotton fiber, 0.5-2 kg of micro-iron particles, 50-85 g/l of sodium hydroxide, 15-20 g/l of sodium carbonate, 30g/l of sodium phosphate, 40-60 g/l of coating liquid and 100-200 g/l of distilled water.
In a preferred embodiment, the production formula comprises the following components in parts by mass: 1kg of phenol, 0.2kg of paraformaldehyde, 15kg of wear-resistant resin, 30g/l of catalyst, 80g/l of toughening agent, 5kg of glass fiber, 5kg of cotton fiber, 1kg of micro-iron particles, 60g/l of sodium hydroxide, 20g/l of sodium carbonate, 30g/l of sodium phosphate, 60g/l of coating liquid and 100g/l of distilled water.
Specifically, the wear-resistant resin is composed of one or more of phenolic resin, PPS resin, ABS resin and vinyl fluoride resin.
The toughening agent is composed of thermoplastic polyurethane, acrylate, styrene and an antioxidant.
The coating liquid is prepared by processing a self-made liquid, tetraethyl orthosilicate (TEOS), tetrabutyl titanate (TEOT), tetrahydrofuran and ethyl acetate, wherein the self-made liquid is prepared by mixing sodium hydroxide, sodium carbonate and sodium phosphate with distilled water;
the first dosage of each component of the coating liquid is as follows:
6.20g of Tetraethoxysilane (TEOS), 14.2g of self-made liquid and 30g of tetrahydrofuran and/or ethyl acetate are used for preparing first coating liquid;
the second dosage of each component of the coating liquid is as follows:
6.20g of tetraethyl orthosilicate (TEOS), 3.72g of tetrabutyl titanate (TEOT), 12.4g of a self-made solution, and 30g of tetrahydrofuran and/or ethyl acetate were used to prepare a second coating solution.
In one embodiment, the wear-resistant plastic is prepared by a wear-resistant plastic production method corresponding to the wear-resistant plastic production formula, and the wear-resistant plastic production method comprises the following steps:
s1, putting phenol, paraformaldehyde, wear-resistant resin and a catalyst into a reaction kettle for copolycondensation reaction for 30 min;
step two of S2, opening a cover body of the reaction kettle after the copolycondensation reaction, and placing the toughening agent into the reaction kettle for blending for 10 min;
s3, putting the glass fiber, the cotton fiber and the micro-iron particles into a reaction kettle, and blending for 5 min;
s4, taking out the coarse material from the reaction kettle, and soaking, drying and cutting the coarse material;
s5, putting the cut coarse materials into an electromagnetic compression molding device, and performing electromagnetic preheating to obtain a non-modified film plastic body;
s6, taking out the non-modified film plastic bodies from the electromagnetic compression molding device, and coating films to prepare wear-resistant plastics;
and step seven of S7, testing the wear resistance and the electrical insulation of the wear-resistant plastic.
In one embodiment, during step five of the method for producing wear-resistant plastics, the electromagnetic preheating mode comprises:
the electromagnetic compression molding device consists of a cylindrical shell and a plastic molding plate, wherein two magnetic plates for the electromagnetic compression molding plate are arranged on the inner side wall of the cylindrical shell, and the magnetic plates are electrified and roll and rotate along the inner side wall of the cylindrical shell, so that a plastic body without a modified film placed on the plastic molding plate is subjected to the action of an electromagnetic field;
in the process of die pressing, the plastic body without the modified film performs electromagnetic field action, and micro iron ions in the plastic body are conducted by magnetic conduction to generate heat, so that electromagnetic preheating is realized.
In one embodiment, during step six of the method for producing wear-resistant plastics, the coating manner includes:
placing the first coating liquid or the second coating liquid into a small measuring cylinder, and controlling the liquid level at 70 mm;
slowly dripping the first coating liquid or the second coating liquid in the small measuring cylinder on the plastic body without the modified film, soaking for 1min, then slowly lifting and putting into a purifier to volatilize the coating liquid;
and (3) putting the non-modified film plastic body after the coating liquid is volatilized into a baking oven, gradually heating to 120 ℃/min from 2 ℃/min, and keeping for 2h to prepare the wear-resistant plastic.
In one embodiment, if the first coating liquid drop is adopted on the non-modified film plastic body, wear-resistant plastic containing a silicon film is prepared; and if the second coating liquid is dropped on the plastic body without the modified film, the wear-resistant plastic containing the silicon-titanium film is prepared.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The production formula of the wear-resistant plastic is characterized by comprising phenol, paraformaldehyde, wear-resistant resin, a catalyst, a toughening agent, glass fiber, cotton fiber, micro iron particles, sodium hydroxide, sodium carbonate, sodium phosphate, coating liquid and distilled water;
the mass amount of each component for preparing one part of wear-resistant plastic in the production formula is as follows:
1-2 kg of phenol, 0.05-0.2 kg of paraformaldehyde, 10-20 kg of wear-resistant resin, 20-30 g/l of catalyst, 50-80 g/l of toughening agent, 1-5 kg of glass fiber, 3-5 kg of cotton fiber, 0.5-2 kg of micro-iron particles, 50-85 g/l of sodium hydroxide, 15-20 g/l of sodium carbonate, 30g/l of sodium phosphate, 40-60 g/l of coating liquid and 100-200 g/l of distilled water.
2. The wear-resistant plastic production formula of claim 1, wherein the mass amounts of the components for preparing one part of wear-resistant plastic in the production formula are as follows: 1kg of phenol, 0.2kg of paraformaldehyde, 15kg of wear-resistant resin, 30g/l of catalyst, 80g/l of toughening agent, 5kg of glass fiber, 5kg of cotton fiber, 1kg of micro-iron particles, 60g/l of sodium hydroxide, 20g/l of sodium carbonate, 30g/l of sodium phosphate, 60g/l of coating liquid and 100g/l of distilled water.
3. The wear-resistant plastic production formula of claim 1, wherein the wear-resistant resin is one or more of phenolic resin, PPS resin, ABS resin and vinyl fluoride resin.
4. The wear-resistant plastic production formula of claim 1, wherein the toughening agent is composed of thermoplastic polyurethane, acrylate, styrene and an antioxidant.
5. The production formula of the wear-resistant plastic according to claim 1, wherein the coating solution is prepared from a self-made solution, tetraethyl orthosilicate (TEOS), tetrabutyl titanate (TEOT), tetrahydrofuran and ethyl acetate, wherein the self-made solution is prepared from sodium hydroxide, sodium carbonate and sodium phosphate mixed distilled water;
the first dosage of each component of the coating liquid is as follows:
6.20g of Tetraethoxysilane (TEOS), 14.2g of self-made liquid and 30g of tetrahydrofuran and/or ethyl acetate are used for preparing first coating liquid;
the second dosage of each component of the coating liquid is as follows:
6.20g of tetraethyl orthosilicate (TEOS), 3.72g of tetrabutyl titanate (TEOT), 12.4g of a self-made solution, and 30g of tetrahydrofuran and/or ethyl acetate were used to prepare a second coating solution.
6. The production formula of wear-resistant plastics according to any one of claims 1 to 5, wherein the wear-resistant plastics are prepared by a wear-resistant plastics production method corresponding to the production formula of wear-resistant plastics, and the wear-resistant plastics production method comprises the following steps:
putting phenol, paraformaldehyde, wear-resistant resin and a catalyst into a reaction kettle for copolycondensation reaction for 30 min;
step two, opening a cover body of the reaction kettle after the copolycondensation reaction, and putting the toughening agent into the reaction kettle for blending for 10 min;
thirdly, putting the glass fiber, the cotton fiber and the micro-iron particles into a reaction kettle for blending for 5 min;
taking the coarse material out of the reaction kettle, and carrying out impregnation, drying and cutting;
fifthly, putting each cut coarse material into an electromagnetic compression molding device, and performing electromagnetic preheating to obtain a non-modified film plastic body;
taking out the non-modified film plastic bodies from the electromagnetic compression molding device, and coating to prepare wear-resistant plastic;
and seventhly, testing the wear resistance and the electrical insulation of the wear-resistant plastic.
7. The wear-resistant plastic production formula according to claim 6, wherein during step five of the wear-resistant plastic production method, the electromagnetic preheating mode comprises:
the electromagnetic compression molding device consists of a cylindrical shell and a plastic molding plate, wherein two magnetic plates for the electromagnetic compression molding plate are arranged on the inner side wall of the cylindrical shell, and the magnetic plates are electrified and roll and rotate along the inner side wall of the cylindrical shell, so that a plastic body without a modified film placed on the plastic molding plate is subjected to the action of an electromagnetic field;
in the process of die pressing, the plastic body without the modified film performs electromagnetic field action, and micro iron ions in the plastic body are conducted by magnetic conduction to generate heat, so that electromagnetic preheating is realized.
8. The wear-resistant plastic production formula of claim 6, wherein during the sixth step of the wear-resistant plastic production method, the coating mode comprises:
placing the first coating liquid or the second coating liquid into a small measuring cylinder, and controlling the liquid level at 70 mm;
slowly dripping the first coating liquid or the second coating liquid in the small measuring cylinder on the plastic body without the modified film, soaking for 1min, then slowly lifting and putting into a purifier to volatilize the coating liquid;
and (3) putting the non-modified film plastic body after the coating liquid is volatilized into a baking oven, gradually heating to 120 ℃/min from 2 ℃/min, and keeping for 2h to prepare the wear-resistant plastic.
9. The wear-resistant plastic production formula of claim 8, wherein if the first coating liquid is dropped on a non-modified film plastic body, a silicon-containing film wear-resistant plastic is produced; and if the second coating liquid is dropped on the plastic body without the modified film, the wear-resistant plastic containing the silicon-titanium film is prepared.
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| CN202011386216.8A CN113402843A (en) | 2021-08-20 | 2021-08-20 | Production formula of wear-resistant plastic |
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| CN202011386216.8A CN113402843A (en) | 2021-08-20 | 2021-08-20 | Production formula of wear-resistant plastic |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114573928A (en) * | 2022-03-03 | 2022-06-03 | 成都水月雨精密电子有限责任公司 | Formula and production process of low-friction-coefficient plastic |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1934592A1 (en) * | 1968-07-19 | 1970-03-12 | Chisso Corp | Process for the production of a film-shaped adhesive |
| CN1978480A (en) * | 2005-11-29 | 2007-06-13 | 西北工业大学 | Polyphenylether modified phenolic resin, and its preparing method |
| CN108641423A (en) * | 2018-06-06 | 2018-10-12 | 彩虹集团新能源股份有限公司 | A kind of preparation method of photovoltaic glass coating liquid |
-
2021
- 2021-08-20 CN CN202011386216.8A patent/CN113402843A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1934592A1 (en) * | 1968-07-19 | 1970-03-12 | Chisso Corp | Process for the production of a film-shaped adhesive |
| CN1978480A (en) * | 2005-11-29 | 2007-06-13 | 西北工业大学 | Polyphenylether modified phenolic resin, and its preparing method |
| CN108641423A (en) * | 2018-06-06 | 2018-10-12 | 彩虹集团新能源股份有限公司 | A kind of preparation method of photovoltaic glass coating liquid |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114573928A (en) * | 2022-03-03 | 2022-06-03 | 成都水月雨精密电子有限责任公司 | Formula and production process of low-friction-coefficient plastic |
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Application publication date: 20210917 |