CN109651734A - A kind of PVC composite material and preparation method of high-strength low-temperature-resistant - Google Patents
A kind of PVC composite material and preparation method of high-strength low-temperature-resistant Download PDFInfo
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- CN109651734A CN109651734A CN201811625311.1A CN201811625311A CN109651734A CN 109651734 A CN109651734 A CN 109651734A CN 201811625311 A CN201811625311 A CN 201811625311A CN 109651734 A CN109651734 A CN 109651734A
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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
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/04—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08L27/06—Homopolymers or copolymers of vinyl chloride
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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
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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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
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention discloses a kind of PVC composite materials of high-strength low-temperature-resistant, it is characterized by comprising the substances of following part: 35-50 parts of P3000 resin-oatmeal, 30-75 parts of P4000 resin-oatmeal, 45-67 parts of plasticizer, 0.9-1.4 parts of calcium-zinc composite stabilizing agent, TPU12-25 parts, 0.2-1.3 parts of lubricant, 0.1-0.3 parts of antioxidant, 0.1-0.4 parts of anti ultraviolet agent, 0.4-2 parts of tackifier, and thus formula PVC material obtained has intensity height, low temperature tolerance ability strong and environmentally friendly and environmental protection.
Description
Technical field
The invention belongs to PVC technical field of composite materials, more particularly, to a kind of PVC composite wood of high-strength low-temperature-resistant
Material.
Background technique
Polyvinyl chloride, English abbreviation PVC (Polyvinyl chloride) is vinyl chloride monomer in peroxide, azo
The initiators such as compound；Or the polymer being polymerized under light, heat effect by mechanism of free-radical polymerization.PVC is using non-
Often extensively.Construction material, industrial product, daily necessities, flooring laminate, floor tile, artificial leather, tubing, wire and cable, packaging film,
Bottle, foamed material, sealing material, fiber etc. are widely used.
Existing PVC material mainly by formula as below P3000 resin-oatmeal, plasticizer, calcium-zinc composite stabilizing agent, lubricant,
Antioxidant and tackifier are constituted, and tensile strength is low, low temperature tolerance ability is poor, causes the service life of its product short, therefore pass through
Reasonable raw material proportioning and technological parameter improve intensity and impact is necessary.
Summary of the invention
It is multiple the purpose of the present invention is in view of the deficiency of the prior art, providing a kind of PVC of high-strength low-temperature-resistant
Condensation material, its intensity is high, low temperature tolerance ability is strong and environmentally friendly and environmental protection.
To achieve the goals above, the technical scheme adopted by the invention is that: a kind of PVC composite wood of high-strength low-temperature-resistant
Material, the substance including following mass fraction: 35-50 parts of P3000 resin-oatmeal, 30-75 parts of P4000 resin-oatmeal, plasticizer 45-67
Part, 0.9-1.4 parts of calcium-zinc composite stabilizing agent, TPU12-25 parts, 0.2-1.3 parts of lubricant, 0.1-0.3 parts of antioxidant, uvioresistant
0.1-0.4 parts of agent, 0.4-2 parts of tackifier.
Further, the plasticizer includes 34-45 parts of dioctyl terephthalate, 8-13 parts of dioctyl adipate, ring
3-9 parts of oxygen soybean oil.
Further, the substance including following part: 50 parts of P3000 resin-oatmeal, 35 parts of P4000 resin-oatmeal, 50 parts of plasticizer,
0.9 part of calcium-zinc composite stabilizing agent, TPU25 parts, 0.4 part of lubricant, 0.4 part of antioxidant, 0.3 part of anti ultraviolet agent, tackifier 1.5
Part.
Further, the plasticizer includes 35 parts of dioctyl terephthalate, 12 parts of dioctyl adipate, epoxy soybean
3 parts of oil.
Further, the lubricant includes polyethylene wax.
Further, comprising the following steps:
Step a: P3000 resin-oatmeal, P4000 resin-oatmeal and dioctyl terephthalate and epoxidized soybean oil are placed in mixed
In conjunction machine, it is kneaded at a high speed at 490~550r/min of revolving speed with mixing machine；
Step b: when adjusting mixing machine internal temperature to 45 DEG C, by calcium-zinc composite stabilizing agent, lubricant, antioxidant, anti-purple
Outer dose is placed in mixing machine, is then kneaded at 400~450r/min of revolving speed with mixing machine；
Step c: when mixing machine internal temperature rises to 60~70 DEG C, dioctyl adipate is placed in mixing machine and is mixed
Refining；
Step d: when mixing machine internal temperature rises to 90~115 DEG C, TPU is placed in mixing machine, and adjust mixing machine
Internal temperature is between 125~145 DEG C, and revolving speed is to be kneaded under 550r/min；
Step e: material is sent out by the discharge door of mixing machine, is sent to the feed inlet of double screw extruder；
Step f: adjustment double screw extruder internal temperature to 145~185 DEG C, open by vacuum pressure -0.06~-0.1MPa
Feeder is opened, material is sent into double screw extruder；It rotates twin-screw to complete to mediate, is prepared into particle；The particle that will be obtained
It is cooled down by crossing wind scoop and vibrating screen.
After adopting the above structure, the invention has the advantages that compared with the prior art:
1. P3000 resin-oatmeal of the invention and the coordination of P4000 resin-oatmeal, can improve the intensity of this composite material.
2. a variety of plasticizer cooperative cooperatings of dioctyl terephthalate, dioctyl adipate, epoxidized soybean oil in the present invention,
It is avoided that product surface is precipitated while improving its low temperature resistant ability during the preparation process.
3. calcium-zinc composite stabilizing agent of the invention and with other component cooperative cooperatings, improve plasticizing efficiency and plasticizing quality,
So that kneading is more uniform, while can be reduced odor contamination, it is more environmentally-friendly.
4. tackifier of the invention can improve plasticizing efficiency, while improving the surface layer of product with other component cooperative cooperatings
Peeling resistance and tear resistance, and then improve its intensity.
Specific embodiment
As described below is only presently preferred embodiments of the present invention, is not intended to limit the scope of the present invention, below it is real
Applying example, the invention will be further described.
Embodiment 1, the substance including following mass fraction: 35 parts of P3000 resin-oatmeal, 70 parts of P4000 resin-oatmeal, to benzene two
43 parts of formic acid dioctyl ester, 8 parts of dioctyl adipate, 9 parts of epoxidized soybean oil, 1.4 parts of calcium-zinc composite stabilizing agent, TPU14 parts, lubrication
1.2 parts of agent, 0.15 part of antioxidant, 0.13 part of anti ultraviolet agent, 0.8 part of tackifier.
Using following steps:
Step a: P3000 resin-oatmeal, P4000 resin-oatmeal and dioctyl terephthalate and epoxidized soybean oil are placed in mixed
In conjunction machine, it is kneaded at a high speed at 490~498r/min of revolving speed with mixing machine；
Step b: when adjusting mixing machine internal temperature to 45 DEG C, by calcium-zinc composite stabilizing agent, lubricant, antioxidant, anti-purple
Outer dose is placed in mixing machine, is then kneaded at 400~405r/min of revolving speed with mixing machine；
Step c: when mixing machine internal temperature rises to 60 DEG C, dioctyl adipate is placed in mixing machine and is kneaded；
Step d: when mixing machine internal temperature rises to 90 DEG C, TPU being placed in mixing machine, and adjusts temperature inside mixing machine
For degree between 125~130 DEG C, revolving speed is to be kneaded under 550r/min；
Step e: material is sent out by the discharge door of mixing machine, is sent to the feed inlet of double screw extruder；
Step f: adjustment double screw extruder internal temperature to 145 DEG C, vacuum pressure -0.06~-0.08MPa is opened and is fed
Material is sent into double screw extruder by glassware；It rotates twin-screw to complete to mediate, is prepared into particle；Obtained particle is passed through
It crosses wind scoop and vibrating screen is cooled down.
Embodiment 2, the substance including following mass fraction: 38 parts of P3000 resin-oatmeal, 60 parts of P4000 resin-oatmeal, to benzene two
39 parts of formic acid dioctyl ester, 9 parts of dioctyl adipate, 7 parts of epoxidized soybean oil, 1.2 parts of calcium-zinc composite stabilizing agent, TPU18 parts, lubrication
1 part of agent, 0.2 part of antioxidant, 0.15 part of anti ultraviolet agent, 1 part of tackifier.
Using following steps:
Step a: P3000 resin-oatmeal, P4000 resin-oatmeal and dioctyl terephthalate and epoxidized soybean oil are placed in mixed
In conjunction machine, it is kneaded at a high speed at 500~508r/min of revolving speed with mixing machine；
Step b: when adjusting mixing machine internal temperature to 45 DEG C, by calcium-zinc composite stabilizing agent, lubricant, antioxidant, anti-purple
Outer dose is placed in mixing machine, is then kneaded at 421~428r/min of revolving speed with mixing machine；
Step c: when mixing machine internal temperature rises to 66 DEG C, dioctyl adipate is placed in mixing machine and is kneaded；
Step d: when mixing machine internal temperature rises to 100 DEG C, TPU is placed in mixing machine, and is adjusted inside mixing machine
Temperature is between 125~129 DEG C, and revolving speed is to be kneaded under 550r/min；
Step e: material is sent out by the discharge door of mixing machine, is sent to the feed inlet of double screw extruder；
Step f: adjustment double screw extruder internal temperature to 152~158 DEG C, open by vacuum pressure -0.07~-0.08MPa
Feeder is opened, material is sent into double screw extruder；It rotates twin-screw to complete to mediate, is prepared into particle；The particle that will be obtained
It is cooled down by crossing wind scoop and vibrating screen.
Embodiment 3, the substance including following mass fraction: 41 parts of P3000 resin-oatmeal, 55 parts of P4000 resin-oatmeal, to benzene two
39 parts of formic acid dioctyl ester, 10 parts of dioctyl adipate, 5 parts of epoxidized soybean oil, 1 part of calcium-zinc composite stabilizing agent, TPU20 parts, lubrication
0.8 part of agent, 0.2 part of antioxidant, 0.15 part of anti ultraviolet agent, 1.1 parts of tackifier.
Using following steps:
Step a: P3000 resin-oatmeal, P4000 resin-oatmeal and dioctyl terephthalate and epoxidized soybean oil are placed in mixed
In conjunction machine, it is kneaded at a high speed at 530~536r/min of revolving speed with mixing machine；
Step b: when adjusting mixing machine internal temperature to 45 DEG C, by calcium-zinc composite stabilizing agent, lubricant, antioxidant, anti-purple
Outer dose is placed in mixing machine, is then kneaded at 420~425r/min of revolving speed with mixing machine；
Step c: when mixing machine internal temperature rises to 68 DEG C, dioctyl adipate is placed in mixing machine and is kneaded；
Step d: when mixing machine internal temperature rises to 103 DEG C, TPU is placed in mixing machine, and is adjusted inside mixing machine
Temperature is between 138~143 DEG C, and revolving speed is to be kneaded under 550r/min；
Step e: material is sent out by the discharge door of mixing machine, is sent to the feed inlet of double screw extruder；
Step f: adjustment double screw extruder internal temperature to 161~167 DEG C, open by vacuum pressure -0.07~-0.08MPa
Feeder is opened, material is sent into double screw extruder；It rotates twin-screw to complete to mediate, is prepared into particle；The particle that will be obtained
It is cooled down by crossing wind scoop and vibrating screen.
Embodiment 4, the substance including following mass fraction: 45 parts of P3000 resin-oatmeal, 45 parts of P4000 resin-oatmeal, to benzene two
37 parts of formic acid dioctyl ester, 11 parts of dioctyl adipate, 4 parts of epoxidized soybean oil, 1 part of calcium-zinc composite stabilizing agent, TPU24 parts, lubrication
0.6 part of agent, 0.2 part of antioxidant, 0.25 part of anti ultraviolet agent, 1.1 parts of tackifier.
Using following steps:
Step a: P3000 resin-oatmeal, P4000 resin-oatmeal and dioctyl terephthalate and epoxidized soybean oil are placed in mixed
In conjunction machine, it is kneaded at a high speed at 485~492r/min of revolving speed with mixing machine；
Step b: when adjusting mixing machine internal temperature to 45 DEG C, by calcium-zinc composite stabilizing agent, lubricant, antioxidant, anti-purple
Outer dose is placed in mixing machine, is then kneaded at 427~431r/min of revolving speed with mixing machine；
Step c: when mixing machine internal temperature rises to 66 DEG C, dioctyl adipate is placed in mixing machine and is kneaded；
Step d: when mixing machine internal temperature rises to 103 DEG C, TPU is placed in mixing machine, and is adjusted inside mixing machine
Temperature is between 137~142 DEG C, and revolving speed is to be kneaded under 550r/min；
Step e: material is sent out by the discharge door of mixing machine, is sent to the feed inlet of double screw extruder；
Step f: adjustment double screw extruder internal temperature to 178~185 DEG C, open by vacuum pressure -0.06~-0.07MPa
Feeder is opened, material is sent into double screw extruder；It rotates twin-screw to complete to mediate, is prepared into particle；The particle that will be obtained
It is cooled down by crossing wind scoop and vibrating screen.
Embodiment 5, the substance including following mass fraction: 50 parts of P3000 resin-oatmeal, 35 parts of P4000 resin-oatmeal, to benzene two
35 parts of formic acid dioctyl ester, 12 parts of dioctyl adipate, 3 parts of epoxidized soybean oil, 0.9 part of calcium-zinc composite stabilizing agent, TPU25 parts, profit
0.4 part of lubrication prescription, 0.3 part of antioxidant, 0.4 part of anti ultraviolet agent, 1.5 parts of tackifier.
Using following steps:
Step a: P3000 resin-oatmeal, P4000 resin-oatmeal and dioctyl terephthalate and epoxidized soybean oil are placed in mixed
In conjunction machine, it is kneaded at a high speed at 525~530r/min of revolving speed with mixing machine；
Step b: when adjusting mixing machine internal temperature to 45 DEG C, by calcium-zinc composite stabilizing agent, lubricant, antioxidant, anti-purple
Outer dose is placed in mixing machine, is then kneaded at 433~440r/min of revolving speed with mixing machine；
Step c: when mixing machine internal temperature rises to 66 DEG C, dioctyl adipate is placed in mixing machine and is kneaded；
Step d: when mixing machine internal temperature rises to 100 DEG C, TPU is placed in mixing machine, and is adjusted inside mixing machine
Temperature is between 132~139 DEG C, and revolving speed is to be kneaded under 550r/min；
Step e: material is sent out by the discharge door of mixing machine, is sent to the feed inlet of double screw extruder；
Step f: adjustment double screw extruder internal temperature to 165~171 DEG C, open by vacuum pressure -0.06~-0.1MPa
Feeder is opened, material is sent into double screw extruder；It rotates twin-screw to complete to mediate, is prepared into particle；The particle that will be obtained
It is cooled down by crossing wind scoop and vibrating screen.
Embodiment 6, the substance including following mass fraction: 50 parts of P3000 resin-oatmeal, 30 parts of P4000 resin-oatmeal, to benzene two
34 parts of formic acid dioctyl ester, 13 parts of dioctyl adipate, 3 parts of epoxidized soybean oil, 0.9 part of calcium-zinc composite stabilizing agent, TPU25 parts, profit
0.2 part of lubrication prescription, 0.3 part of antioxidant, 0.4 part of anti ultraviolet agent, 1.6 parts of tackifier.
Using following steps:
Step a: P3000 resin-oatmeal, P4000 resin-oatmeal and dioctyl terephthalate and epoxidized soybean oil are placed in mixed
In conjunction machine, it is kneaded at a high speed at 545~550r/min of revolving speed with mixing machine；
Step b: when adjusting mixing machine internal temperature to 45 DEG C, by calcium-zinc composite stabilizing agent, lubricant, antioxidant, anti-purple
Outer dose is placed in mixing machine, is then kneaded at 443~450r/min of revolving speed with mixing machine；
Step c: when mixing machine internal temperature rises to 70 DEG C, dioctyl adipate is placed in mixing machine and is kneaded；
Step d: when mixing machine internal temperature rises to 110~115 DEG C, TPU is placed in mixing machine, and adjust mixing machine
Internal temperature is between 139~145 DEG C, and revolving speed is to be kneaded under 550r/min；
Step e: material is sent out by the discharge door of mixing machine, is sent to the feed inlet of double screw extruder；
Step f: adjustment double screw extruder internal temperature to 178~185 DEG C, open by vacuum pressure -0.08~-0.1MPa
Feeder is opened, material is sent into double screw extruder；It rotates twin-screw to complete to mediate, is prepared into particle；The particle that will be obtained
It is cooled down by crossing wind scoop and vibrating screen.
Comparison 1: the substance including following mass fraction: 100 parts of P3000 resin-oatmeal, 45 parts of dioctyl terephthalate, oneself
8 parts of adipate, 3 parts of epoxidized soybean oil, 0.9 part of calcium-zinc composite stabilizing agent, 0.2 part of lubricant, 0.1 part of antioxidant, anti-purple
Outer dose 0.1 part, 0.6 part of tackifier.
The PVC composite material and existing PVC composite material that generate by the formula of Examples 1 to 6 are used into electronics pulling force
Testing machine carries out test and warm testing machine according to GB/T to tensile strength and elongation at break according to GB/T 8804-2003
5470-2008 is shown in Table 1 to the low temperature resistant test test result that carries out,
Table 1:
| Tensile strength (MPa) | Elongation at break (%) | Low temperature resistant (DEG C) | |
| Embodiment 1 | ≥24 | ≥450 | ≤-36 |
| Embodiment 2 | ≥24 | ≥430 | ≤-35 |
| Embodiment 3 | ≥26 | ≥430 | ≤-36 |
| Embodiment 4 | ≥27 | ≥425 | ≤-38 |
| Embodiment 5 | ≥25 | ≥445 | ≤-44 |
| Embodiment 6 | ≥25 | ≥465 | ≤-40 |
| Comparison 1 | ≤22.5 | ≤400 | ≥-30 |
By Examples 1 to 6 and comparison 1 compare known to PVC composite material made from formula by Examples 1 to 6 its
Tensile strength is higher with elongation at break and the low temperature environment that can more adapt to is wider.
Above-described embodiment is only presently preferred embodiments of the present invention, is not limited the scope of the invention according to this, therefore: it is all according to
The equivalence changes that structure of the invention, shape, principle are done, should all be covered by within protection scope of the present invention.
Claims (5)
1. a kind of PVC composite material of high-strength low-temperature-resistant, it is characterised in that: the substance including following mass fraction: P3000 tree
35-50 parts of cosmetics, 30-75 parts of P4000 resin-oatmeal, 45-67 parts of plasticizer, 0.9-1.4 parts of calcium-zinc composite stabilizing agent, TPU12-25
Part, 0.2-1.3 parts of lubricant, 0.1-0.3 parts of antioxidant, 0.1-0.4 parts of anti ultraviolet agent, 0.4-2 parts of tackifier.
2. a kind of PVC composite material of high-strength low-temperature-resistant according to claim 1, it is characterised in that: the plasticizer
Including 34-45 parts of dioctyl terephthalate, 8-13 parts of dioctyl adipate, 3-9 parts of epoxidized soybean oil.
3. a kind of PVC composite material of high-strength low-temperature-resistant according to claim 1, it is characterised in that: including following part
Substance: 50 parts of P3000 resin-oatmeal, 35 parts of P4000 resin-oatmeal, 50 parts of plasticizer, 0.9 part of calcium-zinc composite stabilizing agent, TPU25
Part, 0.4 part of lubricant, 0.3 part of antioxidant, 0.4 part of anti ultraviolet agent, 1.5 parts of tackifier.
4. a kind of PVC composite material of high-strength low-temperature-resistant according to claim 3, it is characterised in that: the plasticizer
Including 35 parts of dioctyl terephthalate, 12 parts of dioctyl adipate, 3 parts of epoxidized soybean oil.
5. according to claim 1 to a kind of preparation side of the PVC composite material of high-strength low-temperature-resistant described in optional one in 4
Method, it is characterised in that: the following steps are included:
Step a: P3000 resin-oatmeal, P4000 resin-oatmeal and dioctyl terephthalate and epoxidized soybean oil are placed in mixing machine
In, it is kneaded at a high speed at 490~550r/min of revolving speed with mixing machine；
Step b: when adjusting mixing machine internal temperature to 45 DEG C, by calcium-zinc composite stabilizing agent, lubricant, antioxidant, anti ultraviolet agent
It is placed in mixing machine, is then kneaded at 400~450r/min of revolving speed with mixing machine；
Step c: when mixing machine internal temperature rises to 60~70 DEG C, dioctyl adipate is placed in mixing machine and is kneaded；
Step d: when mixing machine internal temperature rises to 90~115 DEG C, TPU is placed in mixing machine, and is adjusted inside mixing machine
Temperature is between 125~145 DEG C, and revolving speed is to be kneaded under 550r/min；
Step e: material is sent out by the discharge door of mixing machine, is sent to the feed inlet of double screw extruder；
Step f: adjustment double screw extruder internal temperature to 145~185 DEG C, vacuum pressure -0.06~-0.1MPa is opened and is fed
Material is sent into double screw extruder by glassware；It rotates twin-screw to complete to mediate, is prepared into particle；Obtained particle is passed through
It crosses wind scoop and vibrating screen is cooled down.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811625311.1A CN109651734B (en) | 2018-12-28 | 2018-12-28 | High-strength low-temperature-resistant PVC composite material and preparation method thereof |
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| CN201811625311.1A CN109651734B (en) | 2018-12-28 | 2018-12-28 | High-strength low-temperature-resistant PVC composite material and preparation method thereof |
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| CN109651734B CN109651734B (en) | 2021-02-19 |
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Cited By (1)
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| CN110791038A (en) * | 2019-10-28 | 2020-02-14 | 江苏大海塑料股份有限公司 | Cold-resistant and bending-resistant plastic particle for pipe and preparation method thereof |
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| CN110791038A (en) * | 2019-10-28 | 2020-02-14 | 江苏大海塑料股份有限公司 | Cold-resistant and bending-resistant plastic particle for pipe and preparation method thereof |
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| CN109651734B (en) | 2021-02-19 |
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Denomination of invention: The invention relates to a PVC composite material with high strength and low temperature resistance and a preparation method thereof Effective date of registration: 20210916 Granted publication date: 20210219 Pledgee: Zhejiang Tailong commercial bank Taizhou branch of Limited by Share Ltd. Pledgor: TAIZHOU TIAN DA YUAN TECHNOLOGY Co.,Ltd. Registration number: Y2021980009394 |
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