CN106543702A - A kind of TPU tent materials of anti-Japanese illumination aging - Google Patents
A kind of TPU tent materials of anti-Japanese illumination aging Download PDFInfo
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- CN106543702A CN106543702A CN201610938431.1A CN201610938431A CN106543702A CN 106543702 A CN106543702 A CN 106543702A CN 201610938431 A CN201610938431 A CN 201610938431A CN 106543702 A CN106543702 A CN 106543702A
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- tpu
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- tent materials
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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
- C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
- C08L75/04—Polyurethanes
- C08L75/08—Polyurethanes from polyethers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
- B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/02—Synthetic macromolecular fibres
- B32B2262/0261—Polyamide fibres
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
- C08J2375/08—Polyurethanes from polyethers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2409/00—Characterised by the use of homopolymers or copolymers of conjugated diene hydrocarbons
- C08J2409/02—Copolymers with acrylonitrile
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/16—Applications used for films
-
- 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
Abstract
A kind of TPU tent materials of anti-Japanese illumination aging of disclosure of the invention, are made up of following component：Polyether TPU particle, PNBR, modified coal ash, epoxy aliphatic acid methyl ester, filler, polyethylene, dispersed lubricant, polyhydroxyalkanoate, odium stearate；Compared with existing tent material, TPU tent materials of the present invention, abundant raw material source are with low cost, the interphase interaction and coordination of each component, with waterproof, good, environmentally friendly air-tightness, anti-Japanese illumination aging, the functional characteristics without adjacent benzene class harmful substance.
Description
Technical field
The present invention relates to tent material field, more particularly to a kind of TPU tent materials of anti-Japanese illumination aging.
Background technology
When carrying out activity in the wild, generally require to use tent, tent can give people the place for providing a rest, when
When running into rainy day, hot weather, can be also used for resisting heavy rain and extremely hot, under these extreme weather, to the weather-proof of tent
Property propose very high test, such as performance of anti-rainwater, the performance of anti-Japanese photograph, resistant to elevated temperatures performance etc..
TPUE (TPU) material is a kind of tasteless environmental-protecting material, and TPU is with remarkable high-tension, height
Pulling force, tough and ageing-resistant characteristic, are a kind of ripe environment-friendly materials.At present, TPU has been widely used and health care, electricity
The aspects such as sub- electrical equipment, industry and physical culture, it is intensity height which has other plastic materials incomparable, good toughness, wear-resisting, resistance to
The characteristics such as cold, oil resistant, water-fast, ageing-resistant, weatherability, at the same also have high waterproof and moisture permeability, windproof, cold-proof, antibacterial, it is mould proof,
Many excellent functions such as warming, uvioresistant and energy release.It is external that at first the materials application is led in aviation and medical treatment
Domain.It is with to environmental protection and the attention further of safety, in recent years domestic also progressively to occur and be applied to the row such as recreation facility, daily necessities
Industry.TPU can be divided into two kinds of polyester-type and polyether-type by molecular structure, can be divided into injection grade, extrusion grade, blowing level by processing mode
Deng.The hydrolysis for polyester TPU and polyether TPU material compares, after a certain period of use time its inner material will not be dissolved in
Water, be difficult jaundice, it is soft compared with polyester-type, be that industry material is first-selected, superior performance suitable for product waterborne, at present without other materials
May replace.Although comparing other plastic materials in existing TPU tent materials performance has obvious advantage, which is comprehensive
The demand less than some occasions can be still reached to, especially the aging of resistance to sunshine, need further improvement, to meet the need in market
Ask.
The content of the invention
For this purpose, the purpose of the present invention is a kind of TPU tent materials of anti-Japanese illumination aging.
The present invention is achieved through the following technical solutions：
A kind of TPU tent materials of anti-Japanese illumination aging, are made up of following component by weight：Polyether TPU particle 102-106,
PNBR 2-5, modified coal ash 2-5, epoxy aliphatic acid methyl ester 1-4, filler 13-16, polyethylene 4-7, dispersion lubrication
Agent 1-4, polyhydroxyalkanoate 2-4, odium stearate 1-3, described filler are made up of following component by weight：Bentonite
12nd, be modified sericite 4, dolomite dust 0.6, nano silicon 0.1；By adding polyethylene and polyhydroxyalkanoate, its
The coordinated effect of the two, it is possible to increase the compatibility between each composition, so as to improve the performance quality of TPU tent materials.
Further, the PNBR presses 1 with modified coal ash:1 mass ratio mixes.
Further, the preparation method of the modified coal ash is：Flyash is calcined into 30min at 275-290 DEG C, so
After be cooled to 40-45 DEG C, be added in the sulfuric acid solution that mass concentration is 5.5%, stirring 10min after, add flyash quality
2.65% melamine, after continuing stirring 2h, filters, carries out surface clean using clear water, obtain final product required modified coal ash.
Further, the preparation method of the modified sericite is：Sericite is pressed into 100 with activated Calcium carbonate:1 mass ratio
After example mixes, then add the pentaerythritol ester of quality of sericite 6.5%, after being well mixed, be ground 2 hours, then stand
After 4 hours, pentaerythritol ester is removed, modified sericite is obtained final product.
Further, the dispersed lubricant is glyceryl monostearate.
A kind of preparation method of the TPU tent materials of anti-Japanese illumination aging, by each weight portion by polyether TPU particle, powder fourth
Nitrile rubber, modified coal ash, epoxy aliphatic acid methyl ester, filler, polyethylene, polyhydroxyalkanoate, odium stearate, dispersion lubrication
Agent is added in mill successively, and bag roller is refined into without particle bulk into blob of viscose, breaks into briquet, and input planetary extruder is carried out
Plasticizing, vacuumizing and defoaming in plasticizing process forms translucent column at 155-175 DEG C, obtains polyether TPU material, by four
Roll calendar design temperature is 158-188 DEG C, puts into above-mentioned polyether TPU material, carries out roll surface film forming, and thickness is 0.05-
0.15mm, with nylon composite for base fabric under infrared preheating, fits under the pressure of 1.38MPa, and cooling and shaping is obtained TPU tents
Material.
The invention has the beneficial effects as follows：Compared with existing tent material, TPU tent materials of the present invention, abundant raw material source,
It is with low cost, the interphase interaction and coordination of each component, with waterproof, good, environmentally friendly air-tightness, anti-Japanese illumination aging, without neighbour
The functional characteristics of benzene class harmful substance, and also have antimildew function, material is light, tensile strength is high, acid and alkali-resistance, high temperature resistance, scrub
The features such as folding convenient；The present invention is by using the PNBR and modified coal ash for determining ratio, its collaboration of working in coordination is made
With intensity, wearability, heat resistance, weatherability, anti-flammability and the abrasion resistance of TPU tent materials can be greatly improved, it is to avoid
After TPU tent materials prepared by tradition are scrubbed for a long time, performance is gradually lowered, easily aging problem；By the modified sericite of addition
Act on the coordinated of a small amount of nano silicon so that TPU tent materials prepared by the present invention absorb the ability of ultraviolet
Greatly strengthened, 92.6% can be reached to the absorptivity of long wave ultraviolet (UVA) wavelength (320～400mm), to medium wave
The absorptivity of ultraviolet (UVB) wavelength (280～320nm) can reach 89.4%, and also have infrared external reflection characteristic, right
, up to more than 82%, anti-Japanese illumination aging performance is extremely strong for infrared reflectivity beyond wavelength 800nm, compared to existing TPU tents material
Under identical use environment, the service life of TPU tent materials of the present invention can improve 24-28% to material.
Specific embodiment
Embodiment 1
A kind of TPU tent materials of anti-Japanese illumination aging, are made up of following component by weight：Polyether TPU particle 102-106,
PNBR 2-5, modified coal ash 2-5, epoxy aliphatic acid methyl ester 1-4, filler 13-16, polyethylene 4-7, dispersion lubrication
Agent 1-4, polyhydroxyalkanoate 2-4, odium stearate 1-3, described filler are made up of following component by weight：Bentonite
12nd, be modified sericite 4, dolomite dust 0.6, nano silicon 0.1.
Embodiment 2
A kind of TPU tent materials of anti-Japanese illumination aging, are made up of following component by weight：Polyether TPU particle 102-106,
PNBR 2-5, modified coal ash 2-5, epoxy aliphatic acid methyl ester 1-4, filler 13-16, polyethylene 4-7, dispersion lubrication
Agent 1-4, polyhydroxyalkanoate 2-4, odium stearate 1-3, described filler are made up of following component by weight：Bentonite
12nd, be modified sericite 4, dolomite dust 0.6, nano silicon 0.1.
Embodiment 3
A kind of TPU tent materials of anti-Japanese illumination aging, are made up of following component by weight：Polyether TPU particle 102-106,
PNBR 2-5, modified coal ash 2-5, epoxy aliphatic acid methyl ester 1-4, filler 13-16, polyethylene 4-7, dispersion lubrication
Agent 1-4, polyhydroxyalkanoate 2-4, odium stearate 1-3, described filler are made up of following component by weight：Bentonite
12nd, be modified sericite 4, dolomite dust 0.6, nano silicon 0.1.
In above-described embodiment：
Further, the PNBR presses 1 with modified coal ash:1 mass ratio mixes.
Further, the preparation method of the modified coal ash is：Flyash is calcined into 30min at 275-290 DEG C, so
After be cooled to 40-45 DEG C, be added in the sulfuric acid solution that mass concentration is 5.5%, stirring 10min after, add flyash quality
2.65% melamine, after continuing stirring 2h, filters, carries out surface clean using clear water, obtain final product required modified coal ash.
Further, the preparation method of the modified sericite is：Sericite is pressed into 100 with activated Calcium carbonate:1 mass ratio
After example mixes, then add the pentaerythritol ester of quality of sericite 6.5%, after being well mixed, be ground 2 hours, then stand
After 4 hours, pentaerythritol ester is removed, modified sericite is obtained final product.
Further, the dispersed lubricant is glyceryl monostearate.
A kind of preparation method of the TPU tent materials of anti-Japanese illumination aging, by each weight portion by polyether TPU particle, powder fourth
Nitrile rubber, modified coal ash, epoxy aliphatic acid methyl ester, filler, polyethylene, polyhydroxyalkanoate, odium stearate, dispersion lubrication
Agent is added in mill successively, and bag roller is refined into without particle bulk into blob of viscose, breaks into briquet, and input planetary extruder is carried out
Plasticizing, vacuumizing and defoaming in plasticizing process forms translucent column at 155-175 DEG C, obtains polyether TPU material, by four
Roll calendar design temperature is 158-188 DEG C, puts into above-mentioned polyether TPU material, carries out roll surface film forming, and thickness is 0.05-
0.15mm, with nylon composite for base fabric under infrared preheating, fits under the pressure of 1.38MPa, and cooling and shaping is obtained TPU tents
Material.
Comparative example 1：Difference with embodiment 3 is only without PNBR.
Comparative example 2：Difference with embodiment 3 is only without modified coal ash.
Comparative example 3：Difference with embodiment 3 is only without modified sericite.
Comparative example 4：Difference with embodiment 3 is only without nano silicon.
Comparative example 5：Difference with embodiment 3 is only using the sericite without modification.
The performance test of weather resisteant：
Carbon arc lamp degradation is carried out by GB/T16422.4-1996, using continuous 720h exposure experiments to light, blackboard temperature for (65 ±
3) DEG C, relative humidity is (50 ± 5) %.Survey the stretching strength retentivity of its product, stretching strength retentivity=aging after-drawing
Intensity/aging front tensile strength × 100%.
The numerical value of the stretching strength retentivity of 1 embodiment of table：
| Draw high strength retention % | |
| Embodiment 1 | 94 |
| Embodiment 2 | 94 |
| Embodiment 3 | 95 |
| Comparative example 1 | 85 |
| Comparative example 2 | 86 |
| Comparative example 3 | 81 |
| Comparative example 4 | 85 |
| Comparative example 5 | 87 |
As can be seen from Table 1, the best results of embodiment 3, and be not added with PNBR, modified coal ash, modified sericite,
In nano silicon, the product effect of any one is substantially deteriorated, and for the whether modification of sericite, its effect is also
It is different.
By test, when using common sericite, the TPU tent materials of preparation exist compared to existing TPU tent materials
Service life under identical use environment is only capable of improving 14-18%, it is seen that the whether modification of sericite, with TPU tent materials
The life-span of material also has and has a certain impact.
Claims (6)
1. a kind of TPU tent materials of anti-Japanese illumination aging, it is characterised in that be made up of following component by weight：Polyether TPU
Particle 102-106, PNBR 2-5, modified coal ash 2-5, epoxy aliphatic acid methyl ester 1-4, filler 13-16, polyethylene
4-7, dispersed lubricant 1-4, polyhydroxyalkanoate 2-4, odium stearate 1-3, described filler is by weight by following component
Make：Bentonite 12, modified sericite 4, dolomite dust 0.6, nano silicon 0.1.
2. a kind of TPU tent materials of anti-Japanese illumination aging according to claim 1, it is characterised in that the powdered nitrile rubber
Rubber presses 1 with modified coal ash:1 mass ratio mixes.
3. a kind of TPU tent materials of anti-Japanese illumination aging according to claim 1, it is characterised in that the modified fine coal
Ash preparation method be：Flyash is calcined into 30min at 275-290 DEG C, 40-45 DEG C is subsequently cooled to, is added to quality dense
Spend in the sulfuric acid solution for 5.5%, after stirring 10min, add the melamine of flyash quality 2.65%, after continuing stirring 2h,
Filter, surface clean is carried out using clear water, required modified coal ash is obtained final product.
4. a kind of TPU tent materials of anti-Japanese illumination aging according to claim 1, it is characterised in that the modified thin,tough silk cloud
Female preparation method is：Sericite is pressed into 100 with activated Calcium carbonate:After 1 mass ratio mixes, then add quality of sericite
6.5% pentaerythritol ester, after being well mixed, is ground 2 hours, after then standing 4 hours, removes pentaerythritol ester, obtain final product
Modified sericite.
5. a kind of TPU tent materials of anti-Japanese illumination aging according to claim 1, it is characterised in that the dispersion lubrication
Agent is glyceryl monostearate.
6. the preparation method of the TPU tent materials of a kind of anti-Japanese illumination aging according to claim 1, it is characterised in that press
Each weight portion is by polyether TPU particle, PNBR, modified coal ash, epoxy aliphatic acid methyl ester, filler, polyethylene, poly- hydroxyl
Base fatty acid ester, odium stearate, dispersed lubricant are added in mill successively, and bag roller is refined into without particle bulk into blob of viscose,
Briquet is broken into, input planetary extruder is plastified, and vacuumizing and defoaming in plasticizing process forms translucent at 155-175 DEG C
Column, obtains polyether TPU material, is 158-188 DEG C by four-roll calender design temperature, puts into above-mentioned polyether TPU material,
Roll surface film forming is carried out, thickness is 0.05-0.15mm, with nylon composite for base fabric under infrared preheating, pasted under the pressure of 1.38MPa
Close, cooling and shaping, TPU tent materials are obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610938431.1A CN106543702A (en) | 2016-10-25 | 2016-10-25 | A kind of TPU tent materials of anti-Japanese illumination aging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610938431.1A CN106543702A (en) | 2016-10-25 | 2016-10-25 | A kind of TPU tent materials of anti-Japanese illumination aging |
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| Publication Number | Publication Date |
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| CN106543702A true CN106543702A (en) | 2017-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610938431.1A Pending CN106543702A (en) | 2016-10-25 | 2016-10-25 | A kind of TPU tent materials of anti-Japanese illumination aging |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01210457A (en) * | 1988-02-17 | 1989-08-24 | Kuraray Co Ltd | Polyurethane film or sheet and its production |
| JPH02199166A (en) * | 1989-01-27 | 1990-08-07 | Kuraray Co Ltd | Thermoplastic polyurethane molded item and preparation thereof |
| JPH10194944A (en) * | 1997-01-06 | 1998-07-28 | Pola Chem Ind Inc | Ultraviolet light protective material |
| CN103013266A (en) * | 2012-10-29 | 2013-04-03 | 苏州市建筑科学研究院有限公司 | Reflection heat insulating coating for building |
| CN103642377A (en) * | 2013-10-16 | 2014-03-19 | 苏州瑞邦塑胶有限公司 | Water-based polyurethane composite coating |
| JP5578572B2 (en) * | 2011-04-29 | 2014-08-27 | 独立行政法人産業技術総合研究所 | Composite particles |
| CN103437194B (en) * | 2013-08-16 | 2015-04-08 | 东莞市雄林新材料科技股份有限公司 | Sewing-free hot melt adhesive TPU leather and preparation method thereof |
| CN104589564A (en) * | 2014-08-08 | 2015-05-06 | 江苏增强新材料科技有限公司 | Polyether type tent material production method |
| CN105801951A (en) * | 2016-04-29 | 2016-07-27 | 安徽华宇电缆集团有限公司 | Special anti-aging cable for oil platform |
-
2016
- 2016-10-25 CN CN201610938431.1A patent/CN106543702A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01210457A (en) * | 1988-02-17 | 1989-08-24 | Kuraray Co Ltd | Polyurethane film or sheet and its production |
| JPH02199166A (en) * | 1989-01-27 | 1990-08-07 | Kuraray Co Ltd | Thermoplastic polyurethane molded item and preparation thereof |
| JPH10194944A (en) * | 1997-01-06 | 1998-07-28 | Pola Chem Ind Inc | Ultraviolet light protective material |
| JP5578572B2 (en) * | 2011-04-29 | 2014-08-27 | 独立行政法人産業技術総合研究所 | Composite particles |
| CN103013266A (en) * | 2012-10-29 | 2013-04-03 | 苏州市建筑科学研究院有限公司 | Reflection heat insulating coating for building |
| CN103437194B (en) * | 2013-08-16 | 2015-04-08 | 东莞市雄林新材料科技股份有限公司 | Sewing-free hot melt adhesive TPU leather and preparation method thereof |
| CN103642377A (en) * | 2013-10-16 | 2014-03-19 | 苏州瑞邦塑胶有限公司 | Water-based polyurethane composite coating |
| CN104589564A (en) * | 2014-08-08 | 2015-05-06 | 江苏增强新材料科技有限公司 | Polyether type tent material production method |
| CN105801951A (en) * | 2016-04-29 | 2016-07-27 | 安徽华宇电缆集团有限公司 | Special anti-aging cable for oil platform |
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Application publication date: 20170329 |