CN106674781A - Interior decoration board and producing technology thereof - Google Patents
Interior decoration board and producing technology thereof Download PDFInfo
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- CN106674781A CN106674781A CN201611092905.1A CN201611092905A CN106674781A CN 106674781 A CN106674781 A CN 106674781A CN 201611092905 A CN201611092905 A CN 201611092905A CN 106674781 A CN106674781 A CN 106674781A
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- fabric
- butadiene
- parts
- acrylonitrile rubber
- hot pressing
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Classifications
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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
- C08L25/00—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 an aromatic carbocyclic ring; Compositions of derivatives of such polymers
- C08L25/02—Homopolymers or copolymers of hydrocarbons
- C08L25/04—Homopolymers or copolymers of styrene
- C08L25/06—Polystyrene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/58—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/58—Measuring, controlling or regulating
- B29C2043/5808—Measuring, controlling or regulating pressure or compressing force
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/58—Measuring, controlling or regulating
- B29C2043/5816—Measuring, controlling or regulating temperature
-
- 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
-
- 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
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/16—Fibres; Fibrils
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
Abstract
The invention belongs to the field of building decoration materials, and particularly relates to an interior decoration board and a producing technology thereof. Butadiene-acrylonitrile rubber has viscoelasticity, and when a sound wave exerts a periodic external force on the butadiene-acrylonitrile rubber, the relaxation process of a molecular chain of the butadiene-acrylonitrile rubber causes a lag effect that strain of the sound wave lags behind a stress, so that energy loss is caused and thus the sound waves with different frequencies are decreased; expanded graphite is roasted at high temperature into particulate graphite of which the volume is increased by 50-250 times, the particulate graphite is mingled into the butadiene-acrylonitrile rubber, and the expanded graphite is a bubble filler adopting a loose and porous structure, so that when noise runs through the decoration board made of the butadiene-acrylonitrile rubber, the sound speed in the decoration board is reduced, and thus butadiene-acrylonitrile rubber has low-frequency sound-absorbing performance and the noise absorbing frequency range is widened; fiber fabric is laminated in an expanded graphite layer, and hollow cells of the fiber fabric can reflect the sound wave of the noise in the butadiene-acrylonitrile rubber for many times so as to increase the loss of the sound wave, so that the butadiene-acrylonitrile rubber fabric can efficiently absorb broadband noise.
Description
Technical field
The invention belongs to Building Decoration Material field, more particularly to a kind of indoor decoration plate and its processing technique.
Background technology
Now, with the continuous acceleration of urbanization, environment noise problem has influence on the life of people, work increasingly severely
Make and learn, same air pollution, water pollution become together one of social three big public hazards for it.In order to effectively separate noise,
Common settling mode is to use deadener.Existing deadener is generally cement concrete, glass plate etc., these sound insulations
The soundproof effect of material is not fine, therefore common solution is the thickness for increasing deadener.That what is so caused asks
Topic is that deadener quality is overweight, and high cost, installation process is inconvenient.
The patent of invention of the B of Authorization Notice No. CN 104861413 discloses a kind of decoration interior sound insulation material, the sound insulation material
Material is prepared by the raw materials in：Thermoplastic phenol resin 42-56, expanded vermiculite 20-25, polystyrene foam plastics 4-
6th, silane coupler 2-3, nano carbon black 1-1.5, polymethyl methacrylate 8-10, antioxidant 0.1-0.2, foaming agent 0.1-
0.2nd, magnesite 0.2-0.3, solid content are silicon dioxide gel 2-3,100-200 mesh montmorillonite 20-24 of 10-15%, contain admittedly
Measure aqueous polyurethane emulsion 10-12, the collagen fiber 10-20 for 8-10%；Waste wool felt 20-30；Auxiliary agent 2-5.Prepare
Expanded vermiculite-polyurethane complex emulsions coating thermoplastic phenolic resin nonwoven acoustic insulator quality of materials is light, and thickness is little, soundproof effect
It is very good, with good market prospect.The deadener has adhered to the advantage of conventional polypropylene non-woven material, and its mechanics
Performance is improved, and possesses excellent weatherable, and for a long time using indeformable, and the polyurethane complex emulsions for preparing are in fibre
After tieing up Surface coating solidification, the material of doping causes fibre web intensity to improve, and damping is strengthened, and effect of vibration and noise reduction is obvious, but
It is that the deadener only has good obstruction effect to the sound wave of high frequency, it is impossible to realize the efficient absorption of wide-band noise.
The content of the invention
The present invention is in order to solve the problems, such as decorating board to wide-band noise efficient absorption, there is provided a kind of indoor decoration plate and its
Processing technique.
In order to achieve the above object, base case of the invention provides a kind of indoor decoration plate, thermoplastic styrene resin
40-55 parts, expanded graphite 20-25 parts, silane coupler 2-3 parts, nitrile rubber 18-30 parts, aqueous polyurethane emulsion 10-12,
Antioxidant 0.5-1.2 parts, foaming agent 0.1-0.2 parts, magnesite 0.2-0.3 parts, binding agent 2-3 parts, fabric 20-30 parts；
The expanded graphite be graphite flake is ground after Jing 800-1000 DEG C high-temperature roastings 150-250 times of shape of enlarged volume
Into particulate matter.
The principle of this base case is：Nitrile rubber is the atactic polymer by obtained in butadiene and acrylonitrile polymerization,
Itrile group containing polarized on molecule, with excellent properties such as heat-proof agings, can for a long time use in 120 DEG C of air；Additionally, fourth
Nitrile rubber is also used as sound-absorbing material, is because nitrile rubber has viscoelasticity, when sound wave applies a week to nitrile rubber
During phase property external force, due to the relaxation of nitrile rubber strand, cause strain to lag behind the hysteresis effect of stress, produce energy
Loss, and then the sound wave under different frequency is reduced；Expanded graphite can moment volumetric expansion 150 when being heated and reaching at 1000 DEG C
~300 times so that intumesced graphite structure is loose, porous and bend, expanded surface area, surface energy are improved, by expanded graphite
Adding in nitrile rubber can cause the velocity of sound in material to be remarkably decreased as bubble filler, and attenuation constant substantially increases,
Improve the low frequency absorption performance of nitrile rubber, increase sound absorption frequency range；Fabric is a kind of fusiform cell, and inside has long and narrow
Cell, by fabric and nitrile rubber sample carry out layer and, sound wave is changed by interface layer, and butyronitrile rubber
The multiple reflections between absorption and nitrile rubber fabric inside glue, improve the consume of sound wave, and can prepare preferably reduce noise
Material.
The beneficial effect of this base case is：1st, nitrile rubber has viscoelasticity, and sound wave applies the cycle to nitrile rubber
Property external force when, the relaxation of nitrile rubber strand can cause the strain of sound wave to lag behind the hysteresis effect of stress, produce energy
Amount loss, and then the sound wave under different frequency is reduced；2nd, by being 150-250 times of volumetric expansion by expanded graphite high-temperature roasting
Graphite granule thing be clipped in nitrile rubber, due to expand graphite be a kind of bubble filler of short texture porous so that make an uproar
When sound passes through the decorating board of nitrile rubber material, the velocity of sound in decorating board declines so that nitrile rubber has low frequency absorption performance,
The frequency absorption scope to noise is widened；3rd, by expanded graphite layer middle level and fabric, the middle ghost of fabric
Chamber enables to noise sound wave multiple reflections in nitrile rubber, improves the consume of sound wave so that nitrile rubber fabric can be right
Wide-band noise efficient absorption.
Scheme two：Scheme is preferred based on this, fabric be by through the fabric of pretreatment in fiberizer
Defibrination is obtained.Beneficial effect：Fabric granule diminishes obtained in defibrination, can be dispersed in nitrile rubber.
Scheme three：This is preferred for scheme two, and the solid content of aqueous polyurethane emulsion is 9%.Beneficial effect：The poly- ammonia of aqueouss
When the solid content of ester emulsion is less than 9%, the water content of polyaminoester emulsion is too big, and the solid content of aqueous polyurethane emulsion is more than 9%
When, the viscosity of polyurethane is too big, causes the extrusion of follow-up complex emulsions difficult.
Scheme four：This is preferred for scheme three, and fabric is Caulis et Folium Lini, Boehmeria, at least one of waste wool felt.Beneficial effect
Really：Caulis et Folium Lini, Boehmeria, waste wool felt are common bast-fibres, and structure is than more loose, and sound-absorbing effect is good.
Second base case of the present invention provides a kind of processing technique of indoor decoration plate, and preparation method is as follows：
A. fabric is placed in fiberizer and is polished, fiberizer rotating speed is 4000-6000r/min；
B. the fabric for grinding is placed in into hot pressing in hot press, hot pressing temperature is 120~200 DEG C, and hot pressing time is 10
~15min；
C. by the fabric after hot pressing, thermoplastic styrene resin, expanded graphite, silane coupler, antioxidant, foaming
Agent, magnesite, binding agent are put into together in aqueous polyurethane emulsion according to proportioning, and supersound process 50-60min makes material in breast
It is dispersed in liquid, complex emulsions are obtained；
D. by the complex emulsions room temperature drying for preparing, extrusion, pelletize in double screw extruder are placed in；
E. the pellet of twin-screw extrusion in step D is placed in double roller plastic-making device and is kneaded, the melting temperature of kneading machine is 100
~120 DEG C, mixing time is 6~12min, and sheet specimens are obtained；
F. the sheet specimens kneaded in step E are placed in a mold, the upper and lower of sheet specimens is spread respectively
If nitrile rubber, be then placed on together it is hot-forming on heating platen, wherein, hot-forming pressure is 0.5~0.8MPa, hot pressing
Temperature is 160~200 DEG C, and hot pressing time is 40~65min.
Beneficial effect：Fabric can be pressed into lamellar blank by hot-forming in step B, and the fiber of lamellar blank is knitted
Thing and thermoplastic styrene resin, expanded graphite, silane coupler, antioxidant, foaming agent, magnesite, binding agent, auxiliary agent according to
Proportioning is put into together in aqueous polyurethane emulsion, can by expanded graphite, silane coupler, antioxidant, foaming agent, magnesite,
Binding agent, auxiliary agent are coated on outside lamellar blank fabric, and double screw extruder extrudes mixed emulsion, pelletize, then pellet is placed in
Knead in kneading machine, fabric is sufficiently mixed with expanded graphite, roll-in is in blocks, then by the sheet of batch mixing upper strata of roll-in with
The laid nitrile rubber of layer, by hot-forming mode layer with additionally, hot-forming pressure is 0.5~0.8MPa, temperature is
160~200 DEG C, when the time is 40~65min, the hot pressing effect of butyronitrile composite is good.
Scheme six：This is preferred for scheme five, and hot-forming initial 20min is not pressurized in step F.Beneficial effect：Heat
Molded initial 20min is not added with pressure, enables to nitrile rubber and fully melts with the flaky material in step E, by butyronitrile
Rubber is fully merged with flaky material.
Specific embodiment
Below by specific embodiment, the present invention is further detailed explanation：
Embodiment one：
A. fabric is placed in fiberizer and is polished, fiberizer rotating speed is 4000r/min；
B. the fabric for grinding is placed in into hot pressing in hot press, hot pressing temperature is 120 DEG C, and hot pressing time is 10min；
C. by the fabric 2000g after hot pressing, thermoplastic styrene resin 4000g, expanded graphite 2000g, silane idol
Connection agent 200g, antioxidant 50g, foaming agent 10g, magnesite 20g, binding agent 200g put into together aqueous polyurethane breast according to proportioning
In liquid 1000g, supersound process 50min makes material dispersed in emulsion, and complex emulsions are obtained；
D. by the complex emulsions room temperature drying for preparing, extrusion, pelletize in double screw extruder are placed in；
E. the pellet of twin-screw extrusion in step D is placed in double roller plastic-making device and is kneaded, the melting temperature of kneading machine is 100
DEG C, mixing time is 6min, and sheet specimens are obtained；
F. the sheet specimens kneaded in step E are placed in a mold, the upper and lower of sheet specimens is put respectively
Nitrile rubber is put, hot pressing on heating platen is then placed on together, initial 20min is not added with pressure so as to fully melting, wherein, heat
Molded pressure is 0.5MPa, and hot pressing temperature is 160 DEG C, and hot pressing time is 40min.
Embodiment two：
The present embodiment is differed only in embodiment one, and fiberizer rotating speed is 5000r/min in step (1)；Step (2)
Middle hot pressing temperature is 150 DEG C, and hot pressing time is 12min；Fabric 2500g, thermoplastic styrene in step (3) after hot pressing
Resin 5000g, expanded graphite 2000g, silane coupler 300g, antioxidant 80g, foaming agent 20g, magnesite 20g, binding agent
300g is put into together in aqueous polyurethane emulsion 1000g according to proportioning, supersound process 55min；Melting temperature is in step (5)
120 DEG C, mixing time is 10min；Hot-forming pressure is 0.6MPa in step (6), and hot pressing temperature is 180 DEG C, during hot pressing
Between be 50min.
Embodiment three：
The present embodiment is differed only in embodiment one, and fiberizer rotating speed is 6000r/min in step (1)；Step (2)
Middle hot pressing temperature is 200 DEG C, and hot pressing time is 15min；Fabric 3000g, thermoplastic styrene in step (3) after hot pressing
Resin 5500g, expanded graphite 2500g, silane coupler 300g, antioxidant 120g, foaming agent 20g, magnesite 30g, binding agent
300g is put into together in aqueous polyurethane emulsion 1200g according to proportioning, supersound process 60min；Melting temperature is in step (5)
120 DEG C, mixing time is 12min；Hot-forming pressure is 0.8MPa in step (6), and hot pressing temperature is 200 DEG C, during hot pressing
Between be 60min.
Comparative example：
It is thermoplastic phenol resin 5600g, expanded vermiculite 2500g, polystyrene foam modeling that comparative example provides a kind of raw material
Material 600g, silane coupler 300g, nano carbon black 150g, polymethyl methacrylate 1000g, antioxidant 20g, foaming agent 20g,
Magnesite 30g, solid content are silicon dioxide gel 300g, 100-200 mesh montmorillonite 2400g of 10-15%, solid content is 8-
10% aqueous polyurethane emulsion 1200g, collagen fiber 2000g；Waste wool felt 3000g, by double screw extruder extruding pelletization
Obtained art work.
Embodiment one to three is shown in Table one with the contrast of comparative example sound insulation coefficient：
By the contrast of above-described embodiment one to three and comparative example sound insulation coefficient it is found that being prepared by the processing technique
The sound absorbing power of the decorating board of nitile-butadiene rubber composite material is greatly improved relative to comparative example, and the minimum model of sound-absorbing scope
Enclose and be expanded to 100HZ, for the noise of low frequency, high frequency has good assimilation effect, additionally, the proportioning of the raw material of embodiment two
Parameter and processing technique cause the decorating board sound-absorbing effect of nitrile rubber composite to reach most preferably.
Above-described is only embodiments of the invention, and the general knowledge here such as known concrete structure and characteristic is not made in scheme
Excessive description.It should be pointed out that for a person skilled in the art, on the premise of without departing from present configuration, can be with
Some deformations and improvement are made, these should also be considered as protection scope of the present invention, these are implemented all without the impact present invention
Effect and practical applicability.This application claims protection domain should be defined by the content of its claim, in description
Specific embodiment etc. records the content that can be used for explaining claim.
Claims (6)
1. a kind of indoor decoration plate, it is characterised in that the decorating board is prepared by the raw materials in：
Thermoplastic styrene resin 40-55 parts, expanded graphite 20-25 parts, silane coupler 2-3 parts, nitrile rubber 18-30 parts,
Aqueous polyurethane emulsion 10-12, antioxidant 0.5-1.2 parts, foaming agent 0.1-0.2 parts, magnesite 0.2-0.3 parts, binding agent 2-
3 parts, fabric 20-30 parts；
The expanded graphite be graphite flake is ground after 150-250 times of Jing 800-1000 DEG C high-temperature roastings enlarged volume formed
Grain thing.
2. indoor decoration plate as claimed in claim 1, it is characterised in that the fabric is by through the fiber of pretreatment
Fabric defibrination in fiberizer is obtained.
3. indoor decoration plate as claimed in claim 2, it is characterised in that the solid content of the aqueous polyurethane emulsion is 9%.
4. indoor decoration plate as claimed in claim 3, it is characterised in that the fabric is Caulis et Folium Lini, Boehmeria, waste wool felt
It is at least one.
5. the processing technique of indoor decoration plate as claimed in claim 1, it is characterised in that preparation method is as follows：
A, by fabric be placed in fiberizer polish, fiberizer rotating speed be 4000-6000r/min；
B, the fabric for grinding being placed in hot pressing in hot press, hot pressing temperature is 120 ~ 200 DEG C, hot pressing time is 10 ~
15min；
C, by the fabric after hot pressing, thermoplastic styrene resin, expanded graphite, silane coupler, antioxidant, foaming agent,
Magnesite, binding agent are put into together in aqueous polyurethane emulsion according to proportioning, supersound process 50-60min, make material in emulsion
It is dispersed, complex emulsions are obtained；
D, by the complex emulsions room temperature drying for preparing, be placed in double screw extruder extrusion, pelletize；
E, the pellet of twin-screw extrusion in step D is placed in double roller plastic-making device kneads, the melting temperature of kneading machine is 100 ~ 120
DEG C, mixing time is 6 ~ 12min, and sheet specimens are obtained；
F, by the sheet specimens kneaded in step E place in a mold, fourth is laid into respectively in the upper and lower of sheet specimens
Nitrile rubber, be then placed on together it is hot-forming on heating platen, wherein, hot-forming pressure is 0.5 ~ 0.8MPa, hot pressing temperature
For 160 ~ 200 DEG C, hot pressing time is 40 ~ 65min.
6. a kind of indoor decoration plate as claimed in claim 5 and its processing technique, it is characterised in that hot-forming in step F
Initial 20min be not pressurized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611092905.1A CN106674781B (en) | 2016-12-01 | 2016-12-01 | A kind of indoor decoration plate and its processing technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611092905.1A CN106674781B (en) | 2016-12-01 | 2016-12-01 | A kind of indoor decoration plate and its processing technology |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106674781A true CN106674781A (en) | 2017-05-17 |
| CN106674781B CN106674781B (en) | 2018-12-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611092905.1A Expired - Fee Related CN106674781B (en) | 2016-12-01 | 2016-12-01 | A kind of indoor decoration plate and its processing technology |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005289125A (en) * | 2004-03-31 | 2005-10-20 | Cci Corp | Automobile fiber mat |
| CN102086596A (en) * | 2009-12-03 | 2011-06-08 | 中国科学院化学研究所 | Method for improving middle and low frequency sound absorption performance of fiber porous material |
| CN103890061A (en) * | 2011-07-13 | 2014-06-25 | 奥托·博克泡沫***有限责任公司 | Increasing the sound absorption in foam insulating materials |
| CN105538841A (en) * | 2015-12-30 | 2016-05-04 | 芜湖馨源海绵有限公司 | Sound-insulating pad used inside automobile and preparation process of sound-insulating pad |
| CN105882053A (en) * | 2016-04-27 | 2016-08-24 | 柳州申通汽车科技有限公司 | Multilayer sound absorption and sound insulation composite material for automobiles |
| CN105904803A (en) * | 2016-04-27 | 2016-08-31 | 柳州申通汽车科技有限公司 | Multilayer composite sound-insulating material |
-
2016
- 2016-12-01 CN CN201611092905.1A patent/CN106674781B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005289125A (en) * | 2004-03-31 | 2005-10-20 | Cci Corp | Automobile fiber mat |
| CN102086596A (en) * | 2009-12-03 | 2011-06-08 | 中国科学院化学研究所 | Method for improving middle and low frequency sound absorption performance of fiber porous material |
| CN103890061A (en) * | 2011-07-13 | 2014-06-25 | 奥托·博克泡沫***有限责任公司 | Increasing the sound absorption in foam insulating materials |
| CN105538841A (en) * | 2015-12-30 | 2016-05-04 | 芜湖馨源海绵有限公司 | Sound-insulating pad used inside automobile and preparation process of sound-insulating pad |
| CN105882053A (en) * | 2016-04-27 | 2016-08-24 | 柳州申通汽车科技有限公司 | Multilayer sound absorption and sound insulation composite material for automobiles |
| CN105904803A (en) * | 2016-04-27 | 2016-08-31 | 柳州申通汽车科技有限公司 | Multilayer composite sound-insulating material |
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| CN106674781B (en) | 2018-12-25 |
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Granted publication date: 20181225 Termination date: 20191201 |