CN117071324A - Ceramic fiber pretreatment method for sealing gasket of automobile postprocessor - Google Patents
Ceramic fiber pretreatment method for sealing gasket of automobile postprocessor Download PDFInfo
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- CN117071324A CN117071324A CN202310983450.6A CN202310983450A CN117071324A CN 117071324 A CN117071324 A CN 117071324A CN 202310983450 A CN202310983450 A CN 202310983450A CN 117071324 A CN117071324 A CN 117071324A
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- fiber
- ceramic
- stirrer
- ceramic fiber
- sealing gasket
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- 239000000835 fiber Substances 0.000 title claims abstract description 120
- 239000000919 ceramic Substances 0.000 title claims abstract description 63
- 238000007789 sealing Methods 0.000 title claims abstract description 20
- 238000002203 pretreatment Methods 0.000 title claims abstract description 10
- 239000000853 adhesive Substances 0.000 claims abstract description 30
- 230000001070 adhesive effect Effects 0.000 claims abstract description 30
- 238000003756 stirring Methods 0.000 claims abstract description 16
- 238000010306 acid treatment Methods 0.000 claims abstract description 13
- 239000002002 slurry Substances 0.000 claims abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- 239000000654 additive Substances 0.000 claims abstract description 4
- 230000000996 additive effect Effects 0.000 claims abstract description 4
- 239000000725 suspension Substances 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 14
- 239000011230 binding agent Substances 0.000 claims description 13
- 239000004925 Acrylic resin Substances 0.000 claims description 12
- 229920000178 Acrylic resin Polymers 0.000 claims description 12
- 230000032683 aging Effects 0.000 abstract description 3
- 238000007781 pre-processing Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 17
- 239000006185 dispersion Substances 0.000 description 11
- 239000000047 product Substances 0.000 description 10
- 238000012360 testing method Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 230000007423 decrease Effects 0.000 description 5
- 239000012784 inorganic fiber Substances 0.000 description 4
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 3
- -1 acrylic ester Chemical class 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000004113 Sepiolite Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000003712 anti-aging effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229910052624 sepiolite Inorganic materials 0.000 description 2
- 235000019355 sepiolite Nutrition 0.000 description 2
- 229910052902 vermiculite Inorganic materials 0.000 description 2
- 235000019354 vermiculite Nutrition 0.000 description 2
- 239000010455 vermiculite Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000003522 acrylic cement Substances 0.000 description 1
- 230000003679 aging effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009960 carding Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 239000000413 hydrolysate Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/10—Organic non-cellulose fibres
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/02—Pretreatment of the raw materials by chemical or physical means
- D21B1/021—Pretreatment of the raw materials by chemical or physical means by chemical means
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/02—Methods of beating; Beaters of the Hollander type
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/36—Inorganic fibres or flakes
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
Abstract
The invention relates to the technical field of gaskets, in particular to a ceramic fiber pretreatment method for an automobile post-processor sealing gasket, which comprises the following steps: s1: acid treatment: the electrostatic phenomenon among ceramic fibers is destroyed by the acid treatment agent, so that the ceramic fibers become ideal fiber suspension; the dosage of the acid treatment agent is 2% -5.0%; s2: scattering: the length of the ceramic fiber is shortened by using a stirrer, the frequency and the stirring time length of the stirrer are controlled, and the frequency of the stirrer is 50H Z Stirring for 30min; s3: and (5) copying: adding ceramic fiber, organic fiber and organicMaking lining fiber by using an adhesive; s4: stirring: and stirring the slurry by using a stirrer, so that the additive is fully mixed with the ceramic fiber, wherein the frequency of the stirrer is set to be 40Hz, and the duration is 2 hours. By preprocessing the ceramic fiber, the stretching mildness, the ageing resistance and the folding resistance of the sealing gasket of the automobile postprocessor are improved.
Description
Technical Field
The invention relates to the technical field of chemical industry, in particular to a ceramic fiber pretreatment method for an automobile post-processor sealing gasket.
Background
The sealing gasket for the automobile post-processor is an important part for ensuring the service life and safe work of the post-processor, mainly has the functions of supporting, damping, fixing and sealing, and is produced by taking ceramic fibers as high-temperature resistant materials at home and abroad at present, and is generally manufactured by high-temperature resistant fibers, adhesives and expansion materials. Because the ceramic fiber has poor dispersion effect in the scattering process in the forming process of the sealing gasket of the prior automobile post-processor, the fiber in the slurry is unevenly distributed, and the sealing gasket has the problems of ageing property reduction, insufficient tensile strength and the like after being used for a plurality of times. After the ceramic fiber is broken, the ceramic fiber has short fiber length, the finished product is shrunken, hard, low in bulk, small in elasticity and easy to break, so that the sealing gasket is poor in folding resistance and easy to crack and break in the use process.
Chinese patent publication No. CN101755024B discloses an inorganic fiber sealing gasket coated with pressure-sensitive adhesive on the surface, chinese patent publication No. CN101772626a discloses an inorganic fiber sealing gasket using a heat-activated adhesive, chinese patent publication No. CN101331255B discloses a process for manufacturing a long and short inorganic fiber mixture sealing gasket by dry method, and the above three products do not have good anti-aging performance and anti-blow-out performance. Chinese patent publication No. CN104727903B discloses a ceramic fiber mat treated with a hydrolysate of a silane coupling agent and a method for preparing the same, but the method does not show the anti-aging performance and the folding endurance of the mat. The chinese patent with publication No. CN113293475a provides a pretreatment method of ceramic fiber, which mainly improves the blow-out resistance and aging resistance of ceramic fiber mats by carding and hot-pressing the fiber into an elliptical shape, but does not consider the folding endurance of the mats, and the method is a pretreatment of physical layer.
Disclosure of Invention
The invention aims at solving the problems in the background art and provides a ceramic fiber pretreatment method for an automobile post-processor sealing gasket.
The technical scheme of the invention is as follows: a ceramic fiber pretreatment method for an automobile post-processor sealing gasket comprises the following steps:
s1: acid treatment: the electrostatic phenomenon among ceramic fibers is destroyed by the acid treatment agent, so that the ceramic fibers become ideal fiber suspension; the dosage of the acid treatment agent is 2% -5%, and the dosage is optimal to 4%; ceramic fibers themselves are difficult to disperse in water due to their electrostatic phenomena, while good fiber dispersion is a precondition for ensuring the quality of the liner.
S2: scattering: the length of the ceramic fiber is shortened by using a stirrer, the frequency and the stirring time length of the stirrer are controlled, and the frequency of the stirrer is 50H Z Stirring for 30min; the dispersion effect of the ceramic fibers improves with the increase of the break-up time, but the dispersion effect tends to decrease when the break-up time exceeds 30 minutes.
S3: and (5) copying: adding ceramic fiber, organic fiber and organic adhesive to make pad fiber; the pad made of ceramic fiber has compact combination, and the product has low shrinkage, stiffness, low bulk, small elasticity and easy breaking. The organic fiber used in the test can be uniformly and well mixed with the ceramic fiber system in the papermaking process, and no precipitate exists.
S4: stirring: and stirring the slurry by using a stirrer, so that the additive is fully mixed with the ceramic fiber, wherein the frequency of the stirrer is set to be 40Hz, and the duration is 2 hours. The addition of the organic fiber can better improve the folding resistance of the gasket, and the toughness of the gasket can be perceived to be obviously enhanced along with the addition of the organic fiber by hands; but as the amount of organic fiber added increases, the tensile strength of the liner decreases. In addition, the addition of the organic fiber can affect the high temperature resistance and the heat insulation effect of the liner, so that the addition of the organic fiber is less on the premise of meeting the product quality requirement. The addition amount of the organic fiber is optimal to be 3% -5%.
Compared with the prior art, the invention has the following beneficial technical effects:
the ceramic fiber is subjected to pretreatment such as acid treatment, scattering, shoveling, stirring and the like, and particularly the organic fiber and the organic adhesive are added to shoveling the gasket fiber, so that the stretching mildness, the ageing resistance and the folding resistance of the sealing gasket for the automobile postprocessor are obviously improved.
Drawings
FIG. 1 is a flow chart of a method for pre-treating ceramic fibers for an automotive aftertreatment seal liner;
FIG. 2 is a schematic diagram showing the relationship between acid usage and settling time after ceramic fiber break-up;
FIG. 3 is a graph showing the effect of binder amount on fiber tensile strength;
FIG. 4 is a graph comparing the effect of organic fiber loading on ceramic fiber gasket performance;
FIG. 5 is a graph comparing the effect of acrylic adhesive on gasket performance;
FIG. 6 is a graph comparing the effect of adhesive amount on gasket performance.
Description of the embodiments
The technical scheme of the invention is further described below with reference to the attached drawings and specific embodiments. As shown in fig. 1, a ceramic fiber pretreatment method for an automobile post-processor sealing gasket comprises the following specific implementation steps:
s1: acid treatment: the electrostatic phenomenon among ceramic fibers is destroyed by the acid treatment agent, so that the ceramic fibers become ideal fiber suspension; the dosage of the acid treatment agent is 2% -5%, and the dosage is optimal to 4%; ceramic fibers themselves are difficult to disperse in water due to their electrostatic phenomena, while good fiber dispersion is a precondition for ensuring the quality of the liner.
In this example, seven groups of control tests were set, wherein the acid used was HCl, the HCl concentrations added were 2.0%, 2.5%, 3.0%, 3.5%, 4.0%, 4.5%, 5.0%, and the break-up time was set to 15 minutes, and then the ceramic fiber slurry was left to stand, and the time taken for the ceramic fibers to settle completely was recorded, respectively, and the test results are shown in fig. 2. From the test results, it is found that when the amount of HCl is 4.0%, the ceramic fiber is longest in settling time after scattering, that is, the degree of dispersion of the ceramic fiber in the slurry is highest at this time, so that it is considered that when the amount of HCl is 4.0%, the degree of dispersion of the ceramic fiber can be effectively improved.
S2: scattering: the length of the ceramic fiber is shortened by using a stirrer, the frequency and the stirring time length of the stirrer are controlled, and the frequency of the stirrer is 50H Z Stirring for 30min; the dispersion effect of the ceramic fibers improves with the increase of the break-up time, but the dispersion effect tends to decrease when the break-up time exceeds 30 minutes.
S3: and (5) copying: adding ceramic fiber, organic fiber and organic adhesive to make pad fiber; the pad made of ceramic fiber has compact combination, and the product has low shrinkage, stiffness, low bulk, small elasticity and easy breaking. The organic fiber used in the test can be uniformly and well mixed with the ceramic fiber system in the papermaking process, and no precipitate exists.
The organic fiber used in the embodiment can be uniformly and well mixed with a ceramic fiber system in papermaking without precipitation. The proportions of the sample components used in the test are: 46% fiber, 46% vermiculite, 8% binder, 4% HCl and 15 minutes fiber dispersion time. Then four groups of control tests are respectively arranged, the addition amount of the organic fibers is 1%, 3%, 5% and 7%, the change condition of the gasket quality index is inspected, the test results are shown in fig. 4, and the following can be seen: the addition of the organic fiber can improve the folding resistance of the gasket, and the toughness of the gasket can be perceived to be obviously enhanced along with the addition of the organic fiber by hands; but as the amount of organic fiber added increases, the tensile strength of the liner decreases. In addition, the addition of the organic fiber can affect the high temperature resistance and the heat insulation effect of the liner, so that the addition of the organic fiber is less on the premise of meeting the product quality requirement. The addition amount of the organic fibers is considered to be optimal in terms of 3% -5% by study.
After the fiber for manufacturing the liner and the proportion thereof are reasonably selected, the type and the amount of the adhesive play a critical role in the final performance of the liner, and the tensile strength, the folding strength, the heat resistance, the flexibility and the like of the liner are influenced. The basic principle of selecting adhesive is nontoxic, easy to operate and low in cost, and the basic types are two major types of organic adhesive and inorganic adhesive. Wherein the organic binder types include: acrylic, vinyl acetate, polyurethane.
The test process conditions were as follows: ceramic fiber dispersion time: 15 minutes (4% HCl); the adhesive dosage is as follows: 8%; the dosage of vermiculite: 46%; total fiber usage: 46%; organic fiber dosage: 3% (based on total fiber content).
The effect of different types of adhesives on the properties of the liners was investigated in accordance with the above process conditions, as shown in fig. 3. From the above experimental results, it can be seen that: the inorganic adhesive can endow the gasket with better strength performance, and the tensile strength of the gasket is more than 0.6Mpa and is generally higher than the strength which can be provided by other types of adhesives. However, the folding endurance of the gasket using the inorganic adhesive is poor due to poor film forming toughness of the inorganic adhesive itself. Attempts have been made to overcome the deficiencies of using inorganic binders to form stiff and poor folding endurance by incorporating fiber softeners or other surfactants in the above systems, but the addition of such compounds has significantly reduced the strength of the liners. Therefore, at least the inorganic binder in the selected range is not suitable as the binder for reinforcing the elastic village mat.
Inorganic binders themselves are few in variety and organic binders are various in variety, so there is an attempt to find binders satisfying the conditions among the organic binders. The polyurethane resin in the selected organic adhesive can endow the pad with better flexibility and folding endurance, but the strength of the pad is too low. In contrast, vinyl acetate adhesives provide good strength to the liner, but the liner has high stiffness and poor folding endurance, and cannot meet the requirements of the liner in use and processing.
The monomer for synthesizing acrylic ester contains unsaturated double bond or polar molecular structure, and can be used for constructing a plurality of polymer formulas with various performances, so that compounds with different properties such as viscosity, hardness, strength, durability, ceramic temperature and the like can be obtained, the product has various purposes, and the acrylic resin not only can provide good strength and flexibility for the product, but also has good stability, weather resistance, oil resistance and water resistance, and can not be used for vinyl acetate and aqueous polyurethane emulsion. The acrylic resins used in the experiments exhibited varying properties: the tensile strength of the adhesive gasket is up to 0.89Mpa by using the B-1 acrylic ester, and the B-5 acrylic ester can provide good folding endurance for the gasket, and the gasket has good folding endurance and flexibility by considering the combination of the gasket strength and the folding endurance, wherein the effect of using the B-3 is best, the tensile strength of the gasket reaches 0.68 Mpa.
From the above experiments, it is known that the properties of the adhesive itself determine to a large extent the properties of the gaskets produced after adding it to the slurry system, i.e. if the adhesive itself has a high film strength and a good film flexibility, the gaskets using it as an adhesive will have correspondingly good strength, flexibility and folding endurance.
The effect of the B-3 acrylic resin on the performance of the ceramic fiber pad was examined by changing the amount of the adhesive (the amount of the adhesive is 2% -10%) by selecting the B-3 acrylic resin as the adhesive for the ceramic fiber pad, and the experimental results are shown in FIG. 5.
From the experimental results in the table, it can be seen that: the increased amount of adhesive did not affect the fold resistance of the two different formulation liners, and the liners still exhibited better fold resistance when the amount of acrylic resin was increased by up to 10%. In addition, the effect of acrylic resin usage on CIV liner strength performance was examined and the results are shown in FIG. 6. It can be seen that: the tensile strength of the gasket increases with the increase in the amount of the adhesive, and when the amount of the acrylic resin is less than 6% and 8%, the strength of the gasket increases greatly, and then the change becomes gentle. The three fibers used in the experiment are all inorganic fibers, the bonding force among the fibers is weak, the acrylic resin is thermosetting resin, the fibers are coated by the resin after the acrylic resin is added into a fiber system, and the fibers are mutually connected to form a three-dimensional net structure when heated so as to connect sepiolite and ceramic fibers together, and the strength value of the gasket shows a remarkable rising trend along with the increase of the use amount of the sepiolite and ceramic fibers. When the amount reaches a certain value, the fiber-resin-fiber combination reaches a saturated state, and the strength change of the pad is not obvious when the amount of the adhesive is increased. The acrylic resin is an organic compound, and excessive addition of the acrylic resin can cause the reduction of the high temperature resistance of the system. In addition, since the resin is added in the slurry, an increase in the amount thereof will certainly lead to an increase in the amount of run-off and an increase in the cost of the product. In combination, the binder addition amounts are preferably 6% and 8%.
S4: stirring: and stirring the slurry by using a stirrer, so that the additive is fully mixed with the ceramic fiber, wherein the frequency of the stirrer is set to be 40Hz, and the duration is 2 hours. The addition of the organic fiber can better improve the folding resistance of the gasket, and the toughness of the gasket can be perceived to be obviously enhanced along with the addition of the organic fiber by hands; but as the amount of organic fiber added increases, the tensile strength of the liner decreases. In addition, the addition of the organic fiber can affect the high temperature resistance and the heat insulation effect of the liner, so that the addition of the organic fiber is less on the premise of meeting the product quality requirement. The addition amount of the organic fiber is optimal to be 3% -5%.
The above-described embodiments are merely a few preferred embodiments of the present invention, and many alternative modifications and combinations of the above-described embodiments will be apparent to those skilled in the art based on the technical solutions of the present invention and the related teachings of the above-described embodiments.
Claims (3)
1. The ceramic fiber pretreatment method for the sealing gasket of the automobile postprocessor is characterized by comprising the following steps of:
s1: acid treatment: the electrostatic phenomenon among ceramic fibers is destroyed by the acid treatment agent, so that the ceramic fibers become ideal fiber suspension; the dosage of the acid treatment agent is 2% -5%;
s2: scattering: the length of the ceramic fiber is shortened by using a stirrer, and the ceramic fiber is stirred by the frequency of the stirrerThe length is controlled, and the frequency of the stirrer is 50H Z Stirring for 30min;
s3: and (5) copying: adding ceramic fiber, organic fiber and organic adhesive to make pad fiber;
s4: stirring: and stirring the slurry by using a stirrer, so that the additive is fully mixed with the ceramic fiber, wherein the frequency of the stirrer is set to be 40Hz, and the duration is 2 hours.
2. The method for pretreating ceramic fibers for an automotive postprocessor sealing gasket according to claim 1, wherein the organic fiber is used in an amount of 3% -5%.
3. The pretreatment method of ceramic fibers for an automobile post-processor sealing gasket according to claim 1, wherein the organic binder is acrylic resin and the amount of the organic binder is 6% -8%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310983450.6A CN117071324A (en) | 2023-08-07 | 2023-08-07 | Ceramic fiber pretreatment method for sealing gasket of automobile postprocessor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310983450.6A CN117071324A (en) | 2023-08-07 | 2023-08-07 | Ceramic fiber pretreatment method for sealing gasket of automobile postprocessor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117071324A true CN117071324A (en) | 2023-11-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310983450.6A Pending CN117071324A (en) | 2023-08-07 | 2023-08-07 | Ceramic fiber pretreatment method for sealing gasket of automobile postprocessor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117071324A (en) |
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2023
- 2023-08-07 CN CN202310983450.6A patent/CN117071324A/en active Pending
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