CN112662067A - Polypropylene resin for melt-blown fabric production and preparation method thereof - Google Patents
Polypropylene resin for melt-blown fabric production and preparation method thereof Download PDFInfo
- Publication number
- CN112662067A CN112662067A CN202011613025.0A CN202011613025A CN112662067A CN 112662067 A CN112662067 A CN 112662067A CN 202011613025 A CN202011613025 A CN 202011613025A CN 112662067 A CN112662067 A CN 112662067A
- Authority
- CN
- China
- Prior art keywords
- parts
- polypropylene resin
- antioxidant
- prepared
- fabric production
- 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.)
- Pending
Links
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a polypropylene resin for melt-blown fabric production and a preparation method thereof, and relates to the technical field of materials for melt-blown fabric production. The method comprises the following steps: polypropylene resin, silver ion aqueous solution, waterborne aziridine, waterborne polyurethane, compatilizer, weather-resistant agent and antioxidant; comprises putting the raw materials into a stirrer, stirring and mixing to obtain a mixed material; and putting the mixed material into a double-screw extruder for plasticizing and extruding, cooling to obtain a hardened material, and then granulating, sieving, cooling and drying. The invention has the function of inhibiting the growth of bacteria and viruses and solves the problem of resource waste caused by the fact that the mask and other products made of the existing melt-blown cloth cannot be repeatedly used because of no function of inhibiting the growth of bacteria and viruses.
Description
Technical Field
The invention relates to the technical field of materials for melt-blown fabric production, in particular to a production process of polypropylene resin for melt-blown fabric production.
Background
The melt-blown cloth is the most central material for mask production, and polypropylene is used as a main production raw material. Because the superfine fiber with the unique capillary structure increases the number and the surface area of the fiber per unit area, the melt-blown fabric has good filtering property, shielding property, heat insulation property, oil absorption property and the like, and is widely applied to the fields of air, liquid filtering materials, isolating materials, absorbing materials, medical and industrial mask materials, heat-insulating materials, oil absorption materials, wiping cloth and the like.
However, although the existing melt-blown cloth plays an irreplaceable role due to the excellent filtering performance, the existing melt-blown cloth still has some defects, for example, the existing melt-blown cloth does not have the function of inhibiting the growth of bacteria and viruses, and when products such as a mask made of the existing melt-blown cloth are made, the mask cannot be repeatedly used due to the fact that the products do not have the function of inhibiting the growth of the bacteria and the viruses, so that the resource waste is caused.
Disclosure of Invention
The invention provides a polypropylene resin for melt-blown fabric production and a preparation method thereof, the polypropylene resin prepared by the method not only has the function of inhibiting the growth of bacteria and viruses, but also has the corresponding function of inhibiting the growth of bacteria and viruses by utilizing the melt-blown fabric produced by the method, thereby solving the problem of resource waste caused by the fact that products such as masks made of the existing melt-blown fabric cannot be repeatedly used because of no function of inhibiting the growth of bacteria and viruses.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the raw materials with the following parts by weight are adopted:
100 parts of polypropylene resin, 1-5 parts of silver ion aqueous solution, 1-5 parts of waterborne aziridine, 5-10 parts of waterborne polyurethane, 2-4 parts of compatilizer, 0.5-1 part of weather resistant agent and 0.1-0.5 part of antioxidant;
the preparation method comprises the following steps:
A. weighing the raw materials according to the weight part ratio;
B. putting the raw materials into a stirrer, and stirring and mixing to obtain a mixed material;
C. plasticizing and extruding the mixed material in a double-screw extruder, and cooling to obtain a hardened material; in the plasticizing extrusion process, the temperature of each interval of the double-screw extruder is 180-220 ℃, the length-diameter ratio of the double-screw extruder is 40:1, and the rotating speed of a main machine is 300-400 r/min;
D. and (3) putting the hardened material into a granulator for granulation, and then sieving, cooling and drying.
In the above technical solution, a more specific technical solution may also be: the concentration of the silver ion aqueous solution is 0.2% -3%, and the pH value is 8-10.
Further, the compatilizer is polyethylene grafted maleic anhydride;
the weather-resistant agent is prepared by compounding hindered amine and hindered benzoate;
the antioxidant is prepared from a hindered phenol antioxidant and a phosphite ester antioxidant in a mass ratio of 3: 1 is prepared by compounding according to the proportion of 1.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the silver ion aqueous solution is mainly added for modification, so that the modified polypropylene resin has the effect of inhibiting the growth of bacteria and viruses, and the added waterborne aziridine and waterborne polyurethane are combined, so that the prepared modified polypropylene resin has the effect of inhibiting the growth of bacteria and viruses and has better friction color fastness.
2. The invention ensures the dispersibility of the silver ion aqueous solution in the product modified polypropylene resin by limiting the pH value of the silver ion aqueous solution to 8-10.
Detailed Description
The present invention is further described in detail below with reference to examples;
example 1
The raw materials with the following parts by weight are adopted:
100 parts of polypropylene resin, 1 part of silver ion aqueous solution, 1 part of waterborne aziridine, 5 parts of waterborne polyurethane, 2 parts of compatilizer, 0.5 part of weather-resistant agent and 0.1 part of antioxidant;
wherein the concentration of the silver ion aqueous solution is 0.2%, and the PH value is 8;
the compatilizer is polyethylene grafted maleic anhydride;
the weather-resistant agent is prepared from hindered amine and hindered benzoate according to a mass ratio of 1: 1 in proportion;
the antioxidant is prepared from a hindered phenol antioxidant and a phosphite ester antioxidant in a mass ratio of 3: 1 in proportion;
the preparation method comprises the following steps:
A. weighing the raw materials according to the weight part ratio;
B. putting the raw materials into a stirrer, and stirring and mixing to obtain a mixed material;
C. plasticizing and extruding the mixed material in a double-screw extruder, and cooling to obtain a hardened material; in the plasticizing extrusion process, the temperature of each interval of the double-screw extruder is 190 ℃, 200 ℃, 180 ℃, 210 ℃ and 220 ℃ in sequence, the length-diameter ratio of the double-screw extruder is 40:1, and the rotating speed of a main machine is 300-400 r/min;
D. and (3) putting the hardened material into a granulator for granulation, and then sieving, cooling and drying.
Example 2
The raw materials with the following parts by weight are adopted:
100 parts of polypropylene resin, 3 parts of silver ion aqueous solution, 3 parts of waterborne aziridine, 9 parts of waterborne polyurethane, 3 parts of compatilizer, 0.7 part of weather-resistant agent and 0.8 part of antioxidant;
wherein the concentration of the silver ion aqueous solution is 0.25%, and the PH value is 9;
the compatilizer is polyethylene grafted maleic anhydride;
the weather-resistant agent is prepared from hindered amine and hindered benzoate according to a mass ratio of 1: 1 in proportion;
the antioxidant is prepared from a hindered phenol antioxidant and a phosphite ester antioxidant in a mass ratio of 3: 1 in proportion;
the preparation method comprises the following steps:
A. weighing the raw materials according to the weight part ratio;
B. putting the raw materials into a stirrer, and stirring and mixing to obtain a mixed material;
C. plasticizing and extruding the mixed material in a double-screw extruder, and cooling to obtain a hardened material; in the plasticizing extrusion process, the temperature of each interval of the double-screw extruder is 190 ℃, 200 ℃, 180 ℃, 210 ℃ and 220 ℃ in sequence, the length-diameter ratio of the double-screw extruder is 40:1, and the rotating speed of a main machine is 300-400 r/min;
D. and (3) putting the hardened material into a granulator for granulation, and then sieving, cooling and drying.
Example 3
The raw materials with the following parts by weight are adopted:
100 parts of polypropylene resin, 5 parts of silver ion aqueous solution, 5 parts of waterborne aziridine, 10 parts of waterborne polyurethane, 4 parts of compatilizer, 1 part of weather resistant agent and 0.5 part of antioxidant;
wherein the concentration of the silver ion aqueous solution is 3 percent, and the PH value is 10;
the compatilizer is polyethylene grafted maleic anhydride;
the weather-resistant agent is prepared from hindered amine and hindered benzoate according to a mass ratio of 1: 1 in proportion;
the antioxidant is prepared from a hindered phenol antioxidant and a phosphite ester antioxidant in a mass ratio of 3: 1 in proportion;
the preparation method comprises the following steps:
A. weighing the raw materials according to the weight part ratio;
B. putting the raw materials into a stirrer, and stirring and mixing to obtain a mixed material;
C. plasticizing and extruding the mixed material in a double-screw extruder, and cooling to obtain a hardened material; in the plasticizing extrusion process, the temperature of each interval of the double-screw extruder is 190 ℃, 200 ℃, 180 ℃, 210 ℃ and 220 ℃ in sequence, the length-diameter ratio of the double-screw extruder is 40:1, and the rotating speed of a main machine is 300-400 r/min;
D. and (3) putting the hardened material into a granulator for granulation, and then sieving, cooling and drying.
Comparative example 1
The raw materials with the following parts by weight are adopted:
100 parts of polypropylene resin, 1 part of silver ion aqueous solution, 1 part of waterborne aziridine, 5 parts of waterborne polyurethane, 2 parts of compatilizer, 0.5 part of weather-resistant agent and 0.1 part of antioxidant;
wherein the concentration of the silver ion aqueous solution is 0.2%, and the PH value is 12;
the compatilizer is polyethylene grafted maleic anhydride;
the weather-resistant agent is prepared from hindered amine and hindered benzoate according to a mass ratio of 1: 1 in proportion;
the antioxidant is prepared from a hindered phenol antioxidant and a phosphite ester antioxidant in a mass ratio of 3: 1 in proportion;
the preparation method comprises the following steps:
A. weighing the raw materials according to the weight part ratio;
B. putting the raw materials into a stirrer, and stirring and mixing to obtain a mixed material;
C. plasticizing and extruding the mixed material in a double-screw extruder, and cooling to obtain a hardened material; in the plasticizing extrusion process, the temperature of each interval of the double-screw extruder is 190 ℃, 200 ℃, 180 ℃, 210 ℃ and 220 ℃ in sequence, the length-diameter ratio of the double-screw extruder is 40:1, and the rotating speed of a main machine is 300-400 r/min;
D. and (3) putting the hardened material into a granulator for granulation, and then sieving, cooling and drying.
Comparative example 2
The raw materials with the following parts by weight are adopted:
100 parts of polypropylene resin, 5 parts of silver ion aqueous solution, 5 parts of waterborne aziridine, 10 parts of waterborne polyurethane, 4 parts of compatilizer, 1 part of weather resistant agent and 0.5 part of antioxidant;
wherein the concentration of the silver ion aqueous solution is 3 percent, and the PH value is 7;
the compatilizer is polyethylene grafted maleic anhydride;
the weather-resistant agent is prepared from hindered amine and hindered benzoate according to a mass ratio of 1: 1 in proportion;
the antioxidant is prepared from a hindered phenol antioxidant and a phosphite ester antioxidant in a mass ratio of 3: 1 in proportion;
the preparation method comprises the following steps:
A. weighing the raw materials according to the weight part ratio;
B. putting the raw materials into a stirrer, and stirring and mixing to obtain a mixed material;
C. plasticizing and extruding the mixed material in a double-screw extruder, and cooling to obtain a hardened material; in the plasticizing extrusion process, the temperature of each interval of the double-screw extruder is 190 ℃, 200 ℃, 180 ℃, 210 ℃ and 220 ℃ in sequence, the length-diameter ratio of the double-screw extruder is 40:1, and the rotating speed of a main machine is 300-400 r/min;
D. and (3) putting the hardened material into a granulator for granulation, and then sieving, cooling and drying.
Comparative example 3
The raw materials with the following parts by weight are adopted:
100 parts of polypropylene resin, 3 parts of compatilizer, 0.7 part of weather resistant agent and 0.8 part of antioxidant;
wherein the compatilizer is polyethylene grafted maleic anhydride;
the weather-resistant agent is prepared from hindered amine and hindered benzoate according to a mass ratio of 1: 1 in proportion;
the antioxidant is prepared from a hindered phenol antioxidant and a phosphite ester antioxidant in a mass ratio of 3: 1 in proportion;
the preparation method comprises the following steps:
A. weighing the raw materials according to the weight part ratio;
B. putting the raw materials into a stirrer, and stirring and mixing to obtain a mixed material;
C. plasticizing and extruding the mixed material in a double-screw extruder, and cooling to obtain a hardened material; in the plasticizing extrusion process, the temperature of each interval of the double-screw extruder is 190 ℃, 200 ℃, 180 ℃, 210 ℃ and 220 ℃ in sequence, the length-diameter ratio of the double-screw extruder is 40:1, and the rotating speed of a main machine is 300-400 r/min;
D. and (3) putting the hardened material into a granulator for granulation, and then sieving, cooling and drying.
Performance detection
The detection method comprises the following steps:
1. respectively mixing the products obtained in examples 1-3 and comparative examples 1-3 with an electret master batch material (selecting a non-woven fabric electret master batch produced by Yancheng masterbatch Co., Ltd.) and a color master batch (selecting a special non-woven fabric color master batch produced by Yancheng masterbatch Co., Ltd.) according to a weight ratio of 100:5: 1; melting the obtained mixture, filtering, metering by a metering pump, spraying by a nozzle to form superfine fibers, drawing the superfine fibers by hot air at constant temperature of 220-250 ℃ and constant pressure of 1Mpa to form a test sample, carrying out infrared radiation heat treatment, 10kv voltage electret treatment and circulating cooling treatment on the test sample, and collecting a coupon to obtain the sample melt-sprayed cloth.
2. The prepared sample melt-blown fabric is subjected to antibacterial durability test by taking escherichia coli and staphylococcus aureus as test strains according to a test method disclosed by national standard GB/T21866-.
3. The prepared samples were melt-blown according to ISO 18184: 2014 (E) test method for antiviral property of textiles, H1N1 and H3N2 are used as test viruses to carry out antiviral durability test.
4. The prepared sample was subjected to a rubbing fastness test with a test method disclosed in the melt-blown fabric standard ISO 105X 12, wet rubbing 300 times, alkaline sweat rubbing 200 times, and pure alcohol analysis 10 times.
And (3) testing results:
the results of the tests on the antibacterial durability and the antiviral durability are shown in Table 1.
TABLE 1
As can be seen from the above Table 1, the meltblown fabric produced from the polypropylene resin for meltblown fabric production of the present invention has the effect of inhibiting the production of bacteria and viruses.
Claims (6)
1. The polypropylene resin for melt-blown fabric production is characterized by comprising the following raw materials in parts by weight:
100 parts of polypropylene resin, 1-5 parts of silver ion aqueous solution, 1-5 parts of waterborne aziridine, 5-10 parts of waterborne polyurethane, 2-4 parts of compatilizer, 0.5-1 part of weather resistant agent and 0.1-0.5 part of antioxidant.
2. The polypropylene resin for meltblown fabric production according to claim 1, wherein:
the concentration of the silver ion aqueous solution is 0.2% -3%, and the pH value is 8-10.
3. The polypropylene resin for meltblown fabric production according to claim 1 or 2, wherein:
the compatilizer is polyethylene grafted maleic anhydride;
the weather-resistant agent is prepared by compounding hindered amine and hindered benzoate;
the antioxidant is prepared from a hindered phenol antioxidant and a phosphite ester antioxidant in a mass ratio of 3: 1 is prepared by compounding according to the proportion of 1.
4. A preparation method of polypropylene resin for melt-blown fabric production is characterized by comprising the following steps:
the raw materials with the following parts by weight are adopted:
100 parts of polypropylene resin, 1-5 parts of silver ion aqueous solution, 1-5 parts of waterborne aziridine, 5-10 parts of waterborne polyurethane, 2-4 parts of compatilizer, 0.5-1 part of weather resistant agent and 0.1-0.5 part of antioxidant;
the preparation method comprises the following steps:
A. weighing the raw materials according to the weight part ratio;
B. putting the raw materials into a stirrer, and stirring and mixing to obtain a mixed material;
C. plasticizing and extruding the mixed material in a double-screw extruder, and cooling to obtain a hardened material; in the plasticizing extrusion process, the temperature of each interval of the double-screw extruder is 180-220 ℃, the length-diameter ratio of the double-screw extruder is 40:1, and the rotating speed of a main machine is 300-400 r/min;
D. and (3) putting the hardened material into a granulator for granulation, and then sieving, cooling and drying.
5. The polypropylene resin for meltblown fabric production according to claim 4, wherein:
the concentration of the silver ion aqueous solution is 0.2% -3%, and the pH value is 8-10.
6. The polypropylene resin for meltblown fabric production according to claim 4 or 5, wherein:
the compatilizer is polyethylene grafted maleic anhydride;
the weather-resistant agent is prepared by compounding hindered amine and hindered benzoate;
the antioxidant is prepared from a hindered phenol antioxidant and a phosphite ester antioxidant in a mass ratio of 3: 1 is prepared by compounding according to the proportion of 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011613025.0A CN112662067A (en) | 2020-12-31 | 2020-12-31 | Polypropylene resin for melt-blown fabric production and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011613025.0A CN112662067A (en) | 2020-12-31 | 2020-12-31 | Polypropylene resin for melt-blown fabric production and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112662067A true CN112662067A (en) | 2021-04-16 |
Family
ID=75411186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011613025.0A Pending CN112662067A (en) | 2020-12-31 | 2020-12-31 | Polypropylene resin for melt-blown fabric production and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112662067A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113638131A (en) * | 2021-08-17 | 2021-11-12 | 常州莱飞特新材料科技有限公司 | Method for producing CFT-PP cloth material by melt-blowing technology |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109354767A (en) * | 2018-10-12 | 2019-02-19 | 联泓(江苏)新材料研究院有限公司 | A kind of polypropylene electret agglomerate material and its preparation method and application |
| CN111218056A (en) * | 2018-11-23 | 2020-06-02 | 广州合成材料研究院有限公司 | Long-acting discoloration-resistant antibacterial polypropylene composite material and preparation method thereof |
| CN111424371A (en) * | 2020-04-02 | 2020-07-17 | 北京化工大学 | Device and method for producing polypropylene melt-blown non-woven fabric |
| CN111484710A (en) * | 2020-05-12 | 2020-08-04 | 同曦集团有限公司 | Antibacterial and antiviral master batch for transparent mask, preparation method of antibacterial and antiviral master batch and antibacterial and antiviral transparent mask |
| CN111621091A (en) * | 2020-05-21 | 2020-09-04 | 中广核俊尔(浙江)新材料有限公司 | Ultraviolet-resistant sterilized polypropylene spunbonded fabric with antibacterial performance and preparation method and application thereof |
| CN111718540A (en) * | 2020-06-17 | 2020-09-29 | 常州工程职业技术学院 | Electret master batch for melt-blown fabric, preparation method and application thereof |
| CN111764179A (en) * | 2020-06-01 | 2020-10-13 | 广西鑫深科技有限公司 | Environment-friendly antibacterial artificial leather |
| CN111945294A (en) * | 2020-06-01 | 2020-11-17 | 怀来欧洛普过滤器制造有限公司 | Antibacterial melt-blown fabric and preparation method and application thereof |
-
2020
- 2020-12-31 CN CN202011613025.0A patent/CN112662067A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109354767A (en) * | 2018-10-12 | 2019-02-19 | 联泓(江苏)新材料研究院有限公司 | A kind of polypropylene electret agglomerate material and its preparation method and application |
| CN111218056A (en) * | 2018-11-23 | 2020-06-02 | 广州合成材料研究院有限公司 | Long-acting discoloration-resistant antibacterial polypropylene composite material and preparation method thereof |
| CN111424371A (en) * | 2020-04-02 | 2020-07-17 | 北京化工大学 | Device and method for producing polypropylene melt-blown non-woven fabric |
| CN111484710A (en) * | 2020-05-12 | 2020-08-04 | 同曦集团有限公司 | Antibacterial and antiviral master batch for transparent mask, preparation method of antibacterial and antiviral master batch and antibacterial and antiviral transparent mask |
| CN111621091A (en) * | 2020-05-21 | 2020-09-04 | 中广核俊尔(浙江)新材料有限公司 | Ultraviolet-resistant sterilized polypropylene spunbonded fabric with antibacterial performance and preparation method and application thereof |
| CN111764179A (en) * | 2020-06-01 | 2020-10-13 | 广西鑫深科技有限公司 | Environment-friendly antibacterial artificial leather |
| CN111945294A (en) * | 2020-06-01 | 2020-11-17 | 怀来欧洛普过滤器制造有限公司 | Antibacterial melt-blown fabric and preparation method and application thereof |
| CN111718540A (en) * | 2020-06-17 | 2020-09-29 | 常州工程职业技术学院 | Electret master batch for melt-blown fabric, preparation method and application thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113638131A (en) * | 2021-08-17 | 2021-11-12 | 常州莱飞特新材料科技有限公司 | Method for producing CFT-PP cloth material by melt-blowing technology |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100422405C (en) | Method for producing antibacterial polylactic acid fiber | |
| CN109354767A (en) | A kind of polypropylene electret agglomerate material and its preparation method and application | |
| DE1469106A1 (en) | Improved Textile Threads and Methods of Making Them | |
| CN110863252A (en) | Plant functional polyester filament and preparation method thereof | |
| CN108499220A (en) | Graphene/polypropylene nonwoven filter screen preparation method and applications | |
| CN112662067A (en) | Polypropylene resin for melt-blown fabric production and preparation method thereof | |
| CN112662068A (en) | Electret master batch material special for melt-blown fabric and preparation method thereof | |
| CN103740024B (en) | A kind of antibacterial AES composite material and preparation method thereof | |
| CN103882548A (en) | Functional nylon 66 fiber and preparation method thereof | |
| CN111718540B (en) | Electret master batch for melt-blown fabric, preparation method and application thereof | |
| CN113684557A (en) | Polylactic acid melt-spraying material and preparation method and application thereof | |
| WO2003085051A1 (en) | Antibacterial glass composition, antibacterial resin composition and process for producing the same | |
| CN101967695A (en) | Method for preparing polypropylene fiber with anti-mosquito function | |
| CN111154236A (en) | Special color master batch for antibacterial sanitary fiber and preparation method thereof | |
| CN101760795A (en) | Preparation method of PBT silver-ion antibiotic moisture-absorption deodorization fibre | |
| CN111041585A (en) | Water-repellent polyester functional master batch and preparation method thereof | |
| CN112176722B (en) | Poly (p-phenylene benzobisoxazole) fiber spinning oil and preparation method thereof | |
| CN102534851A (en) | Antibacterial and flame-retardant polyster fiber, and preparation method and application thereof | |
| DE60214109T2 (en) | Uv ray absorbing agents for thermoplastic polymers and process for their preparation | |
| CN112176444A (en) | Oxidation-resistant fiber containing taxus chinensis and preparation method thereof | |
| CN111304774A (en) | Production process of full-degradable active sterilization type environment-friendly non-woven fabric fiber | |
| CN107540935A (en) | A kind of polypropylene reclaimed material composition and preparation method thereof | |
| CH650523A5 (en) | Phthaloperinon dyes. | |
| CN116970238B (en) | High-concentration white master batch and preparation method thereof | |
| CN109295542A (en) | Anion, antibiosis anti-acarien, removes aldehyde composite polyester fiber and its manufacturing method at far infrared |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210416 |
|
| RJ01 | Rejection of invention patent application after publication |