CN112175474A - Production method of TPR (thermal Plastic rubber) shoe material surface treating agent - Google Patents
Production method of TPR (thermal Plastic rubber) shoe material surface treating agent Download PDFInfo
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- CN112175474A CN112175474A CN202011079794.7A CN202011079794A CN112175474A CN 112175474 A CN112175474 A CN 112175474A CN 202011079794 A CN202011079794 A CN 202011079794A CN 112175474 A CN112175474 A CN 112175474A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D153/00—Coating compositions based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers
- C09D153/02—Vinyl aromatic monomers and conjugated dienes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/20—Diluents or solvents
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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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
-
- 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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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Graft Or Block Polymers (AREA)
Abstract
The invention belongs to the technical field of TPR (thermoplastic rubber) shoe materials, and particularly discloses a production method of a TPR shoe material surface treating agent, which is prepared from the following raw materials in parts by weight: 95-100 parts of SBS elastomer, 56-60 parts of high chlorinated polyethylene, 1-3 parts of chlorinated rubber, 3-5 parts of nitrile rubber, 2-6 parts of thermoplastic polyurethane elastomer rubber, 82-88 parts of monomer MMA, 13-15 parts of monomer BA, 1-3 parts of initiator, 2-4 parts of terminator, 1-3 parts of adhesion promoter, 1-5 parts of flame retardant and 18-25 parts of compound solvent; TPU (thermoplastic polyurethane elastomer rubber) is added in the formula: the processing agent prepared by adding TPU has high bearing capacity, impact resistance and shock absorption performance and outstanding cold resistance, still keeps good elasticity, flexibility and other physical properties at minus 35 ℃, has good recycling performance, and can enhance the wear resistance, water resistance and oil resistance of the surface of a shoe material when added into the shoe material surface processing agent.
Description
Technical Field
The invention belongs to the technical field of TPR shoe materials, and particularly relates to a production method of a TPR shoe material surface treating agent.
Background
The TPR material is a thermoplastic rubber material. The TPR material is a thermoplastic soft rubber material which has rubber elasticity and can be directly processed and formed (such as injection molding, extrusion, blow molding and the like) without vulcanization, the TPR material takes thermoplastic styrene-butadiene rubber (such as SBS, SEBS) as a basic raw material, resin (such as PP, PS), filler, plasticizing oil agent and other functional additives are added to the base raw material, and the base material is transparent or white granules; the TPR material is in a particle shape, usually has round spherical particles, ellipsoidal particles and thin round strips, has a bright surface, has better light reflecting performance, has rebound resilience and good wear resistance of rubber, and is excellent in skid resistance and shock absorption performance, the TPR material is superior to the rubber in softness and comfort, but has tensile strength, fatigue resistance and mechanical performance which are inferior to those of vulcanized rubber, and is widely applied to daily products, adult products, hardware tools, case wheels, sports equipment, toy products, automobile accessories, medical products, wire cables, electronic appliances, communication instruments, shoe products and the like. The shoe material and toy industry mainly belongs to the application field of TPR of SBS base materials, and the modified material taking SEBS as the base material is mainly applied to products with aging resistance, weather resistance, high requirements on physical property and tensile strength of the material and ultralow material hardness (lower than 5 degrees of Shore hardness).
Chinese patent web proposed a production method of TPR shoe material surface treatment agent (publication No. CN103304750B), the patent improved the heat resistance and yellowing resistance of the treatment agent, improved the monomer conversion rate in the reaction system, let the polarity of the treatment agent obtain improving by a wide margin, but the present solvent contains a large amount of toluene, toluene toxicity is higher, contact and cause the brain injury of workers easily for a long time, and the environmental pollution is more serious.
Therefore, the person skilled in the art proposes a method for producing a TPR shoe material surface treatment agent to solve the problems mentioned in the background above.
Disclosure of Invention
The invention aims to provide a production method of a TPR shoe material surface treating agent, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention adopts the following technical scheme: the TPR shoe material surface treating agent is prepared from the following raw materials in parts by weight: 95-100 parts of SBS elastomer, 56-60 parts of high chlorinated polyethylene, 1-3 parts of chlorinated rubber, 3-5 parts of nitrile rubber, 2-6 parts of thermoplastic polyurethane elastomer rubber, 82-88 parts of monomer MMA, 13-15 parts of monomer BA, 1-3 parts of initiator, 2-4 parts of terminator, 1-3 parts of adhesion promoter, 1-5 parts of flame retardant and 18-25 parts of compound solvent.
Preferably, the SBS elastomer has a relative density of 0.90 to 0.92; the relative density of the high chlorinated polyethylene is 1.35-1.45, and the relative density of the chlorinated rubber is 1.5-1.7.
Preferably, the initiator is dibenzoyl peroxide, and the terminator is dibutyl hydroxy toluene.
Preferably, the adhesion promoter is prepared by mixing 8 parts of vinyl chloride-vinyl acetate copolymer P710, 15 parts of chlorinated rubber S20 and 10 parts of multifunctional resin AMS-110.
A production method of a TPR shoe material surface treating agent comprises the following steps:
s1, heating the compound solvent in a reaction kettle;
s2, adding SBS elastomer, high chlorinated polyethylene, chlorinated rubber, nitrile rubber and thermoplastic polyurethane elastomer rubber into the heated compound solvent, and heating to 72-78 ℃ in a reaction kettle;
s3, adding monomer MMA after heating to the heating temperature in the step S2;
s4, preserving heat again, adding the initiator when the temperature is raised to 75 ℃, uniformly stirring, raising the temperature to 85 ℃, and preserving heat for 3.5 hours;
s5, adding the monomer BA and the initiator under the rapid stirring state, uniformly stirring, and raising the temperature of a reaction system to 87 ℃ for heat preservation reaction;
s6, reacting for 3-4 hours, adding a terminator, reducing the temperature, adding an adhesion promoter and a flame retardant in the process of reducing the temperature, and uniformly mixing;
s7, discharging when the temperature is reduced to 55 ℃ to obtain a semi-finished product of the TPR treating agent;
s8, mixing the TPR treating agent semi-finished product with a compound solvent semi-finished product, and adjusting the viscosity to 35-45cps/25 ℃ to obtain the treating agent finished product.
Preferably, in the stirring process after the initiator in the step S4, a speed reduction stirring process exists, and the stirring speed is reduced from 220 and 290 revolutions per minute to 35 to 40 revolutions per minute after 0.6 to 0.9 minute of stirring.
Preferably, before the addition of the terminator, a sample is taken 2 hours after the reaction to determine the viscosity of the reaction product, and the measurement is carried out every half hour until the viscosity rises to 2000cps/25 ℃.
The invention has the technical effects and advantages that: compared with the prior art, the method has the advantages that,
1. the invention adds TPU (thermoplastic polyurethane elastomer rubber) in the formula: the processing agent has good wear resistance, water resistance, mildew resistance, oil resistance, permeability and elasticity, has high bearing capacity, impact resistance and shock absorption performance and outstanding cold resistance, still keeps good elasticity, flexibility and other physical properties at minus 35 ℃, has good recycling performance, can enhance the wear resistance, water resistance and oil resistance of the surface of a shoe material when added into the processing agent for the surface of the shoe material, can enhance the toughness and scratch resistance of the surface of the shoe material, has long service life, has certain cold resistance, can enhance the heat insulation performance of the surface of the shoe material, and ensures that the shoe material is comfortable to wear;
2. the adhesion promoter is added, so that the treatment effect is further improved;
3. the organic solvent is replaced by the compound solvent, so that the polarity of the treating agent is enhanced, the toxicity is low, the pollution to the environment is low, a good bonding effect can be achieved, and the finished shoes are firmer.
Detailed Description
The technical solutions in the embodiments of the present invention are 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. The specific embodiments described herein are merely illustrative of the invention and do not delimit the invention. 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 invention provides a TPR shoe material surface treating agent, which is prepared from the following raw materials in parts by weight: 95 parts of SBS elastomer, 56 parts of high chlorinated polyethylene, 1 part of chlorinated rubber, 3 parts of butadiene acrylonitrile rubber, 2 parts of thermoplastic polyurethane elastomer rubber, 82 parts of monomer MMA, 13 parts of monomer BA, 1 part of initiator, 2 parts of terminator, 1 part of adhesion promoter, 1 part of flame retardant and 18 parts of compound solvent.
Specifically, the relative density of the SBS elastomer is 0.90; the relative density of the high chlorinated polyethylene is 1.35, and the relative density of the chlorinated rubber is 1.5.
Specifically, the initiator is dibenzoyl peroxide, and the terminator is dibutyl hydroxy toluene.
Specifically, the adhesion promoter is prepared by mixing 8 parts of vinyl chloride-vinyl acetate copolymer P710, 15 parts of chlorinated rubber S20 and 10 parts of multifunctional resin AMS-110.
A production method of a TPR shoe material surface treating agent comprises the following steps:
s1, heating the compound solvent in a reaction kettle;
s2, adding an SBS elastomer, high chlorinated polyethylene, chlorinated rubber, nitrile rubber and thermoplastic polyurethane elastomer rubber into the heated compound solvent, and heating to 72 ℃ in a reaction kettle;
s3, adding monomer MMA after heating to the heating temperature in the step S2;
s4, preserving heat again, adding the initiator when the temperature is raised to 75 ℃, uniformly stirring, raising the temperature to 85 ℃, and preserving heat for 3.5 hours;
s5, adding the monomer BA and the initiator under the rapid stirring state, uniformly stirring, and raising the temperature of a reaction system to 87 ℃ for heat preservation reaction;
s6, reacting for 3 hours, adding a terminator, reducing the temperature, adding an adhesion promoter and a flame retardant in the process of reducing the temperature, and uniformly mixing;
s7, discharging when the temperature is reduced to 55 ℃ to obtain a semi-finished product of the TPR treating agent;
s8, mixing the TPR treating agent semi-finished product with a compound solvent semi-finished product, and adjusting the viscosity to 35cps/25 ℃ to obtain the treating agent finished product.
Specifically, in the stirring process after the initiator in step S4, there is a process of stirring at a reduced speed, and after stirring for 0.6 minute, the stirring speed is reduced from 220 rpm to 35 rpm.
Specifically, before the addition of the terminator, the reaction was carried out for 2 hours, and then the viscosity of the reaction mixture was measured by sampling and measuring every half hour until the viscosity increased to 2000cps/25 ℃.
Example 2
The invention provides a TPR shoe material surface treating agent, which is prepared from the following raw materials in parts by weight: 98 parts of SBS elastomer, 58 parts of high chlorinated polyethylene, 2 parts of chlorinated rubber, 4 parts of nitrile rubber, 5 parts of thermoplastic polyurethane elastomer rubber, 85 parts of monomer MMA, 14 parts of monomer BA, 2 parts of initiator, 3 parts of terminator, 2 parts of adhesion promoter, 4 parts of flame retardant and 20 parts of compound solvent.
Specifically, the relative density of the SBS elastomer is 0.91; the relative density of the high chlorinated polyethylene is 1.40, and the relative density of the chlorinated rubber is 1.6.
Specifically, the initiator is dibenzoyl peroxide, and the terminator is dibutyl hydroxy toluene.
Specifically, the adhesion promoter is prepared by mixing 8 parts of vinyl chloride-vinyl acetate copolymer P710, 15 parts of chlorinated rubber S20 and 10 parts of multifunctional resin AMS-110.
A production method of a TPR shoe material surface treating agent comprises the following steps:
s1, heating the compound solvent in a reaction kettle;
s2, adding an SBS elastomer, high chlorinated polyethylene, chlorinated rubber, nitrile rubber and thermoplastic polyurethane elastomer rubber into the heated compound solvent, and heating to 75 ℃ in a reaction kettle;
s3, adding monomer MMA after heating to the heating temperature in the step S2;
s4, preserving heat again, adding the initiator when the temperature is raised to 75 ℃, uniformly stirring, raising the temperature to 85 ℃, and preserving heat for 3.5 hours;
s5, adding the monomer BA and the initiator under the rapid stirring state, uniformly stirring, and raising the temperature of a reaction system to 87 ℃ for heat preservation reaction;
s6, reacting for 3.5 hours, adding a terminator after the reaction is finished, reducing the temperature, adding an adhesion promoter and a flame retardant in the process of reducing the temperature, and uniformly mixing;
s7, discharging when the temperature is reduced to 55 ℃ to obtain a semi-finished product of the TPR treating agent;
s8, mixing the TPR treating agent semi-finished product with a compound solvent semi-finished product, and adjusting the viscosity to 40cps/25 ℃ to obtain the treating agent finished product.
Specifically, in the stirring process after the initiator in step S4, there is a process of stirring at a reduced speed, and after 0.7 minute of stirring, the stirring speed is reduced from 250 rpm to 38 rpm.
Specifically, before the addition of the terminator, the reaction was carried out for 2 hours, and then the viscosity of the reaction mixture was measured by sampling and measuring every half hour until the viscosity increased to 2000cps/25 ℃.
Example 3
The invention provides a TPR shoe material surface treating agent, which is prepared from the following raw materials in parts by weight: 100 parts of SBS elastomer, 60 parts of high chlorinated polyethylene, 3 parts of chlorinated rubber, 5 parts of nitrile rubber, 6 parts of thermoplastic polyurethane elastomer rubber, 88 parts of monomer MMA, 15 parts of monomer BA, 3 parts of initiator, 4 parts of terminator, 3 parts of adhesion promoter, 5 parts of flame retardant and 25 parts of compound solvent.
Specifically, the relative density of the SBS elastomer is 0.92; the relative density of the high chlorinated polyethylene is 1.45, and the relative density of the chlorinated rubber is 1.7.
Specifically, the initiator is dibenzoyl peroxide, and the terminator is dibutyl hydroxy toluene.
Specifically, the adhesion promoter is prepared by mixing 8 parts of vinyl chloride-vinyl acetate copolymer P710, 15 parts of chlorinated rubber S20 and 10 parts of multifunctional resin AMS-110.
A production method of a TPR shoe material surface treating agent comprises the following steps:
s1, heating the compound solvent in a reaction kettle;
s2, adding an SBS elastomer, high chlorinated polyethylene, chlorinated rubber, nitrile rubber and thermoplastic polyurethane elastomer rubber into the heated compound solvent, and heating to 78 ℃ in a reaction kettle;
s3, adding monomer MMA after heating to the heating temperature in the step S2;
s4, preserving heat again, adding the initiator when the temperature is raised to 75 ℃, uniformly stirring, raising the temperature to 85 ℃, and preserving heat for 3.5 hours;
s5, adding the monomer BA and the initiator under the rapid stirring state, uniformly stirring, and raising the temperature of a reaction system to 87 ℃ for heat preservation reaction;
s6, reacting for 4 hours, adding a terminator, reducing the temperature, adding an adhesion promoter and a flame retardant in the process of reducing the temperature, and uniformly mixing;
s7, discharging when the temperature is reduced to 55 ℃ to obtain a semi-finished product of the TPR treating agent;
s8, mixing the TPR treating agent semi-finished product with a compound solvent semi-finished product, and adjusting the viscosity to 45cps/25 ℃ to obtain the treating agent finished product.
Specifically, in the stirring process after the initiator in step S4, there is a process of stirring at a reduced speed, and after 0.9 minute of stirring, the stirring speed is reduced from 290 rpm to 40 rpm.
Specifically, before the addition of the terminator, the reaction was carried out for 2 hours, and then the viscosity of the reaction mixture was measured by sampling and measuring every half hour until the viscosity increased to 2000cps/25 ℃.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (7)
1. A TPR shoe material surface treating agent is characterized in that: the material is prepared from the following raw materials in parts by weight: 95-100 parts of SBS elastomer, 56-60 parts of high chlorinated polyethylene, 1-3 parts of chlorinated rubber, 3-5 parts of nitrile rubber, 2-6 parts of thermoplastic polyurethane elastomer rubber, 82-88 parts of monomer MMA, 13-15 parts of monomer BA, 1-3 parts of initiator, 2-4 parts of terminator, 1-3 parts of adhesion promoter, 1-5 parts of flame retardant and 18-25 parts of compound solvent.
2. The TPR shoe material surface treatment agent as set forth in claim 1, wherein: the relative density of the SBS elastomer is 0.90-0.92; the relative density of the high chlorinated polyethylene is 1.35-1.45, and the relative density of the chlorinated rubber is 1.5-1.7.
3. The TPR shoe material surface treatment agent as set forth in claim 1, wherein: the initiator is dibenzoyl peroxide, and the terminator is dibutyl hydroxy toluene.
4. The TPR shoe material surface treatment agent as set forth in claim 1, wherein: the adhesion promoter is prepared by mixing 8 parts of vinyl chloride-vinyl acetate copolymer P710, 15 parts of chlorinated rubber S20 and 10 parts of multifunctional resin AMS-110.
5. The production method of the TPR shoe material surface treatment agent as claimed in any one of claims 1 to 4, wherein: the method comprises the following steps:
s1, heating the compound solvent in a reaction kettle;
s2, adding SBS elastomer, high chlorinated polyethylene, chlorinated rubber, nitrile rubber and thermoplastic polyurethane elastomer rubber into the heated compound solvent, and heating to 72-78 ℃ in a reaction kettle;
s3, adding monomer MMA after heating to the heating temperature in the step S2;
s4, preserving heat again, adding the initiator when the temperature is raised to 75 ℃, uniformly stirring, raising the temperature to 85 ℃, and preserving heat for 3.5 hours;
s5, adding the monomer BA and the initiator under the rapid stirring state, uniformly stirring, and raising the temperature of a reaction system to 87 ℃ for heat preservation reaction;
s6, reacting for 3-4 hours, adding a terminator, reducing the temperature, adding an adhesion promoter and a flame retardant in the process of reducing the temperature, and uniformly mixing;
s7, discharging when the temperature is reduced to 55 ℃ to obtain a semi-finished product of the TPR treating agent;
s8, mixing the TPR treating agent semi-finished product with a compound solvent semi-finished product, and adjusting the viscosity to 35-45cps/25 ℃ to obtain the treating agent finished product.
6. The method for producing a TPR shoe material surface treatment agent as claimed in claim 5, wherein: in the stirring process after the initiator in the step S4, a speed-reducing stirring process exists, and the stirring speed is reduced from 220 and 290 revolutions per minute to 35 to 40 revolutions per minute after stirring for 0.6 to 0.9 minute.
7. The method for producing a TPR shoe material surface treatment agent as claimed in claim 5, wherein: before the addition of the terminator, the reaction was allowed to proceed for 2 hours, and then the viscosity of the reaction mixture was measured by sampling every half hour until the viscosity increased to 2000cps/25 ℃.
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| CN202011079794.7A CN112175474A (en) | 2020-10-10 | 2020-10-10 | Production method of TPR (thermal Plastic rubber) shoe material surface treating agent |
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| CN202011079794.7A CN112175474A (en) | 2020-10-10 | 2020-10-10 | Production method of TPR (thermal Plastic rubber) shoe material surface treating agent |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113402837A (en) * | 2021-06-02 | 2021-09-17 | 佛山市高明大都化工有限公司 | EVA (ethylene-vinyl acetate) treating agent and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103304750A (en) * | 2012-03-12 | 2013-09-18 | 深圳凯奇化工有限公司 | Production method of TPR shoe material surface treatment agent |
| CN111073012A (en) * | 2019-12-31 | 2020-04-28 | 广东绿洲化工有限公司 | TPR material surface treating agent and preparation method thereof |
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2020
- 2020-10-10 CN CN202011079794.7A patent/CN112175474A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103304750A (en) * | 2012-03-12 | 2013-09-18 | 深圳凯奇化工有限公司 | Production method of TPR shoe material surface treatment agent |
| CN111073012A (en) * | 2019-12-31 | 2020-04-28 | 广东绿洲化工有限公司 | TPR material surface treating agent and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113402837A (en) * | 2021-06-02 | 2021-09-17 | 佛山市高明大都化工有限公司 | EVA (ethylene-vinyl acetate) treating agent and preparation method thereof |
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Application publication date: 20210105 |