CN113402814A - PP (polypropylene) backing plate for slicing single/polycrystalline silicon rod and preparation method thereof - Google Patents
PP (polypropylene) backing plate for slicing single/polycrystalline silicon rod and preparation method thereof Download PDFInfo
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- CN113402814A CN113402814A CN202110912900.3A CN202110912900A CN113402814A CN 113402814 A CN113402814 A CN 113402814A CN 202110912900 A CN202110912900 A CN 202110912900A CN 113402814 A CN113402814 A CN 113402814A
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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
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08L2201/02—Flame or fire retardant/resistant
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Abstract
The invention discloses a PP (polypropylene) backing plate for slicing a single/polycrystalline silicon rod and a preparation method thereof, wherein the PP backing plate comprises the following raw materials in parts by weight: 55-80 parts of PP resin, 10-15 parts of tough resin, 5-20 parts of polar resin, 5-10 parts of filler, 0.3-0.5 part of antioxidant, 0.2-0.3 part of lubricant and 5-10 parts of flame retardant; the PP resin has low density, easy cutting, high temperature resistance, no deformation during cutting and no sticking; the tough resin material is wear-resistant and vibration-absorbing, so that the cutting stability of the diamond wire is improved; the polar resin and the filler improve the polarity of a system, ensure that the plate can use epoxy glue as an adhesive, the modified PP cutting cushion plate has high cost performance, easy cutting, no deformation, small linear vibration, low cost and high cost performance, and can effectively enhance the cutting stability and improve the yield of cutting. The cut line mark on the surface of the cut silicon wafer is light, the surface is good, and the surface of the backing plate can be quickly carbonized and covered to achieve the effects of heat insulation and oxygen isolation during combustion, so that flame is quickly extinguished.
Description
Technical Field
The invention relates to the technical field of solar silicon wafer preparation, in particular to a PP (polypropylene) backing plate for slicing a single/polycrystalline silicon rod and a preparation method thereof.
Background
Along with the environmental protection requirement of carbon neutralization, the new energy technology obtains sufficient attention in the industrial field, in particular to photovoltaic energy. At present, the photovoltaic power generation mainly uses single/polycrystalline silicon photovoltaic cells for power generation. The silicon wafer is mainly processed by adopting a diamond wire multi-wire cutting technology, and the higher the yield in the cutting process, the lower the cost.
The diameter of the diamond wire is gradually reduced from 60-80 mu m to 30-40 mu m, the wire cutting tension is reduced, the jitter of the diamond wire is increased during high-speed cutting, the cutting system is more and more unstable, and in order to ensure the cutting yield, the easy cutting performance and the quality stability of cutting glue and a cutting backing plate need to be improved.
The cutting backing plate is made of the material which is easy to cut, absorb shock and resist cutting, so that the stability of a cutting system can be effectively improved, and the rate of finished products of the slices can be improved.
Disclosure of Invention
The invention aims to provide a PP (polypropylene) backing plate for slicing a single/polycrystalline silicon rod and a preparation method thereof.
The purpose of the invention can be realized by the following technical scheme:
the PP backing plate for slicing the single/polycrystalline silicon rod comprises the following raw materials in parts by weight: 55-80 parts of PP resin, 10-15 parts of tough resin, 5-20 parts of polar resin, 5-10 parts of filler, 0.3-0.5 part of antioxidant, 0.2-0.3 part of lubricant and 5-10 parts of flame retardant.
Further, the tough resin is one of nylon resin PA6 and polyketone resin POK.
Further, the polar resin is one of ethylene-maleic anhydride copolymer and sulfonated PP resin.
Furthermore, the filler is one or a mixture of more of diatomite, calcium carbonate and talcum powder in any proportion.
Further, the antioxidant is prepared by mixing an antioxidant 1010 and an antioxidant 168 in a mass ratio of 1:1.
Further, the lubricant is ethylene bis stearamide.
Further, the flame retardant is prepared by the following steps:
step A1: dissolving neopentyl glycol in chloroform, stirring and dropwise adding phosphorus oxychloride at the rotation speed of 200-300r/min and the temperature of 25-30 ℃, reacting for 5-7h at the temperature of 65-70 ℃, adding 2-bromoresorcinol, adding pyridine at the temperature of 0-5 ℃ and reacting for 8-10h to obtain an intermediate 1;
the reaction process is as follows:
step A2: dissolving the intermediate 1 in tetrahydrofuran, introducing nitrogen for protection, adding n-butyllithium at the temperature of 78-80 ℃ below zero for reaction for 1-1.5h, adding triisopropyl borate, and continuing the reaction for 2-3h to obtain an intermediate 2;
the reaction process is as follows:
step A3: cyanuric chloride, furfuryl amine and triethylamine are added into the reaction, the reaction is carried out for 3-5h under the conditions that the rotating speed is 150-200r/min and the temperature is 0-5 ℃, an intermediate 3 is prepared, the intermediate 3, the intermediate 2, palladium tetratriphenylphosphine, potassium carbonate and tetrahydrofuran are added into a reaction kettle, nitrogen is introduced for protection, the reflux reaction is carried out for 10-15h under the temperature of 80-90 ℃, and then the tetrahydrofuran is distilled and removed, thus preparing the flame retardant.
The reaction process is as follows:
further, the ratio of the neopentyl glycol, the chloroform, the phosphorus oxychloride, the 2-bromoresorcinol and the pyridine in the step A1 is 0.2mol:30mL:0.2mol:0.1mol:0.1 mol.
Further, the intermediate 1, n-butyllithium and triisopropylborate in the step A2 are used in a molar ratio of 1:1.2: 1.5.
Further, the molar ratio of the cyanuric chloride to the furfuryl amine to the triethylamine in the step A3 is 1:1:1, and the molar ratio of the intermediate 3 to the intermediate 2 to the palladium tetratriphenylphosphine to the potassium carbonate is 0.01:0.02:0.01: 2.
A preparation method of a PP (polypropylene) backing plate for slicing a single/polycrystalline silicon rod comprises the following steps:
step S1: mixing and granulating raw materials: weighing PP resin, tough resin, polar resin, a filler, an antioxidant, a lubricant and a flame retardant, mixing and granulating in a double-screw extruder, wherein the temperature of the double-screw extruder is set at 220-240 ℃;
step S2: extrusion of calendered plastic sheet: extruding the prepared compound resin particles in an extrusion calender to draw a plate, cutting at a fixed length, and preparing a blank plate, wherein the extrusion temperature is set at 200-220 ℃, and the extrusion speed is controlled at 0.5 m/min;
step S3: and (3) plastic plate post-treatment: and milling the blank plate, cleaning and packaging to obtain the PP cushion plate.
The invention has the beneficial effects that: the invention selects PP resin as a main material in the process of preparing the PP liner plate for slicing the mono/polycrystalline silicon rod, the material has low price, high cost performance, low density, easy cutting, high temperature resistance, no deformation and no thread sticking during cutting, a tough resin material is added to increase the vibration absorption effect of a system, the linear shock of superfine diamond wires can be improved to a limited extent, polar resin and a filling agent are added to improve the polarity of the system, the plate can be ensured to use epoxy glue as an adhesive, the prepared PP liner plate has the advantages of easy cutting, no deformation, small linear shock, low cost, high cost performance, light cutting line mark and good surface of a cut silicon wafer surface, a flame retardant is prepared, neopentyl glycol is used as a raw material to react with phosphorus oxychloride as a raw material, then the reaction is carried out with 2-resorcinol bromide to prepare an intermediate 1, the intermediate 1 is treated with n-butyl lithium and triisopropyl borate, preparing an intermediate 2, reacting cyanuric chloride with furfuryl amine through temperature control to prepare an intermediate 3, and further reacting the intermediate 3 with the intermediate 2 to prepare the flame retardant, wherein the flame retardant can be quickly carbonized and covered on the surface of the backing plate when the backing plate is burnt to achieve the effects of heat insulation and oxygen isolation, so that the flame can be quickly extinguished.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.
Example 1
The PP backing plate for slicing the single/polycrystalline silicon rod comprises the following raw materials in parts by weight: 55 parts of PP resin, 10 parts of nylon resin PA6, 5 parts of ethylene-maleic anhydride copolymer, 5 parts of diatomite, 0.3 part of antioxidant, 0.2 part of ethylene bis stearamide and 5 parts of flame retardant;
the PP liner plate is prepared by the following steps:
step S1: mixing and granulating raw materials: weighing PP resin, nylon resin PA6, ethylene-maleic anhydride copolymer, diatomite, an antioxidant, ethylene bis stearamide and a flame retardant, mixing and granulating in a double-screw extruder, wherein the temperature of the double-screw extruder is set at 220 ℃;
step S2: extrusion of calendered plastic sheet: extruding the prepared compound resin particles in an extrusion calender to draw a plate, cutting the plate at a fixed length, and preparing a blank plate, wherein the extrusion temperature is set at 200 ℃, and the extrusion speed is controlled at 0.5 m/min;
step S3: and (3) plastic plate post-treatment: and milling the blank plate, cleaning and packaging to obtain the PP cushion plate.
The flame retardant is prepared by the following steps:
step A1: dissolving neopentyl glycol in chloroform, stirring and dropwise adding phosphorus oxychloride at the rotation speed of 200r/min and the temperature of 25 ℃, reacting for 5 hours at the temperature of 65 ℃, adding 2-bromoresorcinol, adding pyridine at the temperature of 0 ℃, and reacting for 8 hours to obtain an intermediate 1;
step A2: dissolving the intermediate 1 in tetrahydrofuran, introducing nitrogen for protection, adding n-butyllithium for reaction for 1h at the temperature of minus 78 ℃, adding triisopropyl borate, and continuing the reaction for 2h to obtain an intermediate 2;
step A3: cyanuric chloride, furfuryl amine and triethylamine are added into a reaction, the reaction is carried out for 3h at the rotation speed of 150r/min and the temperature of 0 ℃ to obtain an intermediate 3, the intermediate 2, palladium tetratriphenylphosphine, potassium carbonate and tetrahydrofuran are added into a reaction kettle, nitrogen is introduced for protection, reflux reaction is carried out for 10h at the temperature of 80 ℃, and then the tetrahydrofuran is distilled to remove, thus obtaining the flame retardant.
Example 2
The PP backing plate for slicing the single/polycrystalline silicon rod comprises the following raw materials in parts by weight: 70 parts of PP resin, 15 parts of nylon resin PA6, 5.5 parts of ethylene-maleic anhydride copolymer, 9 parts of diatomite, 0.3 part of antioxidant, 0.2 part of ethylene bis stearamide and 6 parts of flame retardant;
the PP liner plate is prepared by the following steps:
step S1: mixing and granulating raw materials: weighing PP resin, nylon resin PA6, ethylene-maleic anhydride copolymer, diatomite, an antioxidant, ethylene bis stearamide and a flame retardant, mixing and granulating in a double-screw extruder, wherein the temperature of the double-screw extruder is set at 220 ℃;
step S2: extrusion of calendered plastic sheet: extruding the prepared compound resin particles in an extrusion calender to draw a plate, cutting the plate at a fixed length, and preparing a blank plate, wherein the extrusion temperature is set at 200 ℃, and the extrusion speed is controlled at 0.5 m/min;
step S3: and (3) plastic plate post-treatment: and milling the blank plate, cleaning and packaging to obtain the PP cushion plate.
The flame retardant is prepared by the following steps:
step A1: dissolving neopentyl glycol in chloroform, stirring and dropwise adding phosphorus oxychloride at the rotation speed of 200r/min and the temperature of 25 ℃, reacting for 5 hours at the temperature of 65 ℃, adding 2-bromoresorcinol, adding pyridine at the temperature of 0 ℃, and reacting for 8 hours to obtain an intermediate 1;
step A2: dissolving the intermediate 1 in tetrahydrofuran, introducing nitrogen for protection, adding n-butyllithium for reaction for 1h at the temperature of minus 78 ℃, adding triisopropyl borate, and continuing the reaction for 2h to obtain an intermediate 2;
step A3: cyanuric chloride, furfuryl amine and triethylamine are added into a reaction, the reaction is carried out for 3h at the rotation speed of 150r/min and the temperature of 0 ℃ to obtain an intermediate 3, the intermediate 2, palladium tetratriphenylphosphine, potassium carbonate and tetrahydrofuran are added into a reaction kettle, nitrogen is introduced for protection, reflux reaction is carried out for 10h at the temperature of 80 ℃, and then the tetrahydrofuran is distilled to remove, thus obtaining the flame retardant.
Example 3
The PP backing plate for slicing the single/polycrystalline silicon rod comprises the following raw materials in parts by weight: 60 parts of PP resin, 10 parts of nylon resin PA6, 20 parts of ethylene-maleic anhydride copolymer, 9.5 parts of talcum powder, 0.3 part of antioxidant, 0.2 part of ethylene bis stearamide and 7 parts of flame retardant;
the PP liner plate is prepared by the following steps:
step S1: mixing and granulating raw materials: weighing PP resin, nylon resin PA6, ethylene-maleic anhydride copolymer, talcum powder, antioxidant, ethylene bis-stearamide and flame retardant, mixing and granulating in a double-screw extruder, wherein the temperature of the double-screw extruder is set at 220 ℃;
step S2: extrusion of calendered plastic sheet: extruding the prepared compound resin particles in an extrusion calender to draw a plate, cutting the plate at a fixed length, and preparing a blank plate, wherein the extrusion temperature is set at 200 ℃, and the extrusion speed is controlled at 0.5 m/min;
step S3: and (3) plastic plate post-treatment: and milling the blank plate, cleaning and packaging to obtain the PP cushion plate.
The flame retardant is prepared by the following steps:
step A1: dissolving neopentyl glycol in chloroform, stirring and dropwise adding phosphorus oxychloride at the rotation speed of 200r/min and the temperature of 25 ℃, reacting for 5 hours at the temperature of 65 ℃, adding 2-bromoresorcinol, adding pyridine at the temperature of 0 ℃, and reacting for 8 hours to obtain an intermediate 1;
step A2: dissolving the intermediate 1 in tetrahydrofuran, introducing nitrogen for protection, adding n-butyllithium for reaction for 1h at the temperature of minus 78 ℃, adding triisopropyl borate, and continuing the reaction for 2h to obtain an intermediate 2;
step A3: cyanuric chloride, furfuryl amine and triethylamine are added into a reaction, the reaction is carried out for 3h at the rotation speed of 150r/min and the temperature of 0 ℃ to obtain an intermediate 3, the intermediate 2, palladium tetratriphenylphosphine, potassium carbonate and tetrahydrofuran are added into a reaction kettle, nitrogen is introduced for protection, reflux reaction is carried out for 10h at the temperature of 80 ℃, and then the tetrahydrofuran is distilled to remove, thus obtaining the flame retardant.
Example 4
The PP backing plate for slicing the single/polycrystalline silicon rod comprises the following raw materials in parts by weight: 78 parts of PP resin, 10 parts of nylon resin PA6, 5 parts of ethylene-maleic anhydride copolymer, 6.2 parts of calcium carbonate, 0.5 part of antioxidant, 0.3 part of ethylene bis stearamide and 9 parts of flame retardant;
the PP liner plate is prepared by the following steps:
step S1: mixing and granulating raw materials: weighing PP resin, nylon resin PA6, ethylene-maleic anhydride copolymer, calcium carbonate, antioxidant, ethylene bis stearamide and flame retardant, mixing and granulating in a double-screw extruder, wherein the temperature of the double-screw extruder is set at 240 ℃;
step S2: extrusion of calendered plastic sheet: extruding the prepared compound resin particles in an extrusion calender to draw a plate, cutting the plate at a fixed length, and preparing a blank plate, wherein the extrusion temperature is set at 220 ℃, and the extrusion speed is controlled at 0.5 m/min;
step S3: and (3) plastic plate post-treatment: and milling the blank plate, cleaning and packaging to obtain the PP cushion plate.
The flame retardant is prepared by the following steps:
step A1: dissolving neopentyl glycol in chloroform, stirring and dropwise adding phosphorus oxychloride at the rotation speed of 300r/min and the temperature of 30 ℃, reacting for 7 hours at the temperature of 70 ℃, adding 2-bromoresorcinol, adding pyridine at the temperature of 5 ℃, and reacting for 10 hours to obtain an intermediate 1;
step A2: dissolving the intermediate 1 in tetrahydrofuran, introducing nitrogen for protection, adding n-butyllithium for reaction for 1.5h at the temperature of 80 ℃ below zero, adding triisopropyl borate, and continuing the reaction for 3h to obtain an intermediate 2;
step A3: cyanuric chloride, furfuryl amine and triethylamine are added into a reaction, the reaction is carried out for 5 hours at the rotation speed of 200r/min and the temperature of 5 ℃ to obtain an intermediate 3, the intermediate 2, palladium tetratriphenylphosphine, potassium carbonate and tetrahydrofuran are added into a reaction kettle, nitrogen is introduced for protection, reflux reaction is carried out for 10-15 hours at the temperature of 80-90 ℃, and then the tetrahydrofuran is distilled off to obtain the flame retardant.
Example 5
The PP backing plate for slicing the single/polycrystalline silicon rod comprises the following raw materials in parts by weight: 80 parts of PP resin, 15 parts of nylon resin PA6, 20 parts of ethylene-maleic anhydride copolymer, 10 parts of diatomite, 0.5 part of antioxidant, 0.3 part of ethylene bis stearamide and 10 parts of flame retardant;
the PP liner plate is prepared by the following steps:
step S1: mixing and granulating raw materials: weighing PP resin, nylon resin PA6, ethylene-maleic anhydride copolymer, diatomite, an antioxidant, ethylene bis stearamide and a flame retardant, mixing and granulating in a double-screw extruder, wherein the temperature of the double-screw extruder is set at 240 ℃;
step S2: extrusion of calendered plastic sheet: extruding the prepared compound resin particles in an extrusion calender to draw a plate, cutting the plate at a fixed length, and preparing a blank plate, wherein the extrusion temperature is set at 220 ℃, and the extrusion speed is controlled at 0.5 m/min;
step S3: and (3) plastic plate post-treatment: and milling the blank plate, cleaning and packaging to obtain the PP cushion plate.
The flame retardant is prepared by the following steps:
step A1: dissolving neopentyl glycol in chloroform, stirring and dropwise adding phosphorus oxychloride at the rotation speed of 300r/min and the temperature of 30 ℃, reacting for 7 hours at the temperature of 70 ℃, adding 2-bromoresorcinol, adding pyridine at the temperature of 5 ℃, and reacting for 10 hours to obtain an intermediate 1;
step A2: dissolving the intermediate 1 in tetrahydrofuran, introducing nitrogen for protection, adding n-butyllithium for reaction for 1.5h at the temperature of 80 ℃ below zero, adding triisopropyl borate, and continuing the reaction for 3h to obtain an intermediate 2;
step A3: cyanuric chloride, furfuryl amine and triethylamine are added into a reaction, the reaction is carried out for 5h at the rotation speed of 200r/min and the temperature of 5 ℃ to obtain an intermediate 3, the intermediate 2, palladium tetratriphenylphosphine, potassium carbonate and tetrahydrofuran are added into a reaction kettle, nitrogen is introduced for protection, reflux reaction is carried out for 15h at the temperature of 90 ℃, and then the tetrahydrofuran is distilled to remove, thus obtaining the flame retardant.
Comparative example
This comparative example is a PP sheet disclosed in chinese patent CN 107723824A.
Slicing the single/polycrystalline silicon rods of the PP plates prepared in examples 1 to 3 and comparative example at a cutting speed of 10 knives/24 hours, counting a wire breakage rate, a wire hanging rate and a plate dropping rate, and measuring flame retardancy of the PP plates, with the results shown in the following table;
| example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Comparative example | |
| Percentage of broken wire% | 1.3 | 1.3 | 1.5 | 1.4 | 1.6 | 2.8 |
| The thread hanging rate% | 1.5 | 1.2 | 1.2 | 1.3 | 1.3 | 3.5 |
| Percentage of chipping off% | 0.8 | 1.2 | 1.0 | 0.9 | 1.0 | 2.5 |
| Flame retardant rating | V1 | V1 | V1 | V1 | V1 | V2 |
As can be seen from the above Table 1, the PP liner plates prepared in the examples 1 to 5 have the wire breakage rate of 1.3 to 1.6%, the wire hanging rate of 1.2 to 1.5%, the sheet dropping rate of 0.8 to 1.2% and the flame retardant rating of V1, and have better effects than the PP plates prepared in the comparative example, which shows that the PP liner plates prepared in the invention have the characteristics of easy cutting, no deformation, small wire shock, low cost and good flame retardant effect.
The foregoing is merely exemplary and illustrative of the principles of the present invention and various modifications, additions and substitutions of the specific embodiments described herein may be made by those skilled in the art without departing from the principles of the present invention or exceeding the scope of the claims set forth herein.
Claims (7)
1. The utility model provides a PP backing plate is used in single/polycrystal silicon rod section which characterized in that: the feed comprises the following raw materials in parts by weight: 55-80 parts of PP resin, 10-15 parts of tough resin, 5-20 parts of polar resin, 5-10 parts of filler, 0.3-0.5 part of antioxidant, 0.2-0.3 part of lubricant and 5-10 parts of flame retardant.
2. The PP liner plate for slicing single/polycrystalline silicon rod according to claim 1, wherein: the tough resin is one of nylon resin PA6 and polyketone resin POK.
3. The PP liner plate for slicing single/polycrystalline silicon rod according to claim 1, wherein: the polar resin is one of ethylene-maleic anhydride copolymer and sulfonated PP resin.
4. The PP liner plate for slicing single/polycrystalline silicon rod according to claim 1, wherein: the filler is one or a mixture of more of diatomite, calcium carbonate and talcum powder in any proportion.
5. The PP liner plate for slicing single/polycrystalline silicon rod according to claim 1, wherein: the antioxidant is prepared by mixing an antioxidant 1010 and an antioxidant 168 according to a mass ratio of 1:1.
6. The PP liner plate for slicing single/polycrystalline silicon rod according to claim 1, wherein: the lubricant is ethylene bis stearamide.
7. The method for preparing a PP pad plate for slicing a mono/polycrystalline silicon rod according to claim 1, wherein: the method specifically comprises the following steps:
step S1: mixing and granulating raw materials: weighing PP resin, tough resin, polar resin, a filler, an antioxidant, a lubricant and a flame retardant, mixing and granulating in a double-screw extruder, wherein the temperature of the double-screw extruder is set at 220-240 ℃;
step S2: extrusion of calendered plastic sheet: extruding the prepared compound resin particles in an extrusion calender to draw a plate, cutting at a fixed length, and preparing a blank plate, wherein the extrusion temperature is set at 200-220 ℃, and the extrusion speed is controlled at 0.5 m/min;
step S3: and (3) plastic plate post-treatment: and milling the blank plate, cleaning and packaging to obtain the PP cushion plate.
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| CN202110912900.3A CN113402814B (en) | 2021-08-10 | 2021-08-10 | PP (polypropylene) backing plate for slicing single/polycrystalline silicon rods and preparation method thereof |
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| CN202110912900.3A CN113402814B (en) | 2021-08-10 | 2021-08-10 | PP (polypropylene) backing plate for slicing single/polycrystalline silicon rods and preparation method thereof |
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| CN114836008B (en) * | 2022-05-25 | 2023-09-05 | 武汉宜田科技发展有限公司 | Plastic plate for multi-wire cutting of diamond wires of hard and brittle materials |
| CN115304741A (en) * | 2022-08-30 | 2022-11-08 | 上海嘉均瑞科技有限公司 | Polyurethane anti-seepage sealing ring and preparation method thereof |
| CN115304741B (en) * | 2022-08-30 | 2023-09-01 | 兴宇汽车零部件股份有限公司 | Polyurethane anti-seepage sealing ring and preparation method thereof |
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