CN107955566A - A kind of ABS compounds and preparation method and application - Google Patents
A kind of ABS compounds and preparation method and application Download PDFInfo
- Publication number
- CN107955566A CN107955566A CN201711091780.5A CN201711091780A CN107955566A CN 107955566 A CN107955566 A CN 107955566A CN 201711091780 A CN201711091780 A CN 201711091780A CN 107955566 A CN107955566 A CN 107955566A
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- Prior art keywords
- abs
- temperature
- abs compounds
- compound
- extruder
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Classifications
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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
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J155/00—Adhesives based on homopolymers or copolymers, obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in groups C09J123/00 - C09J153/00
- C09J155/02—ABS [Acrylonitrile-Butadiene-Styrene] polymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/183—Sealing members
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The present invention provides a kind of ABS compounds and preparation method and application, which is made of the raw material including following parts by weight：89 99 parts of ABS resin, 1 10 parts of cohesion modifiers, bond modified 0.1 0.5 parts of synergist, 03 parts of auxiliary agent.ABS compounds excellent in mechanical performance of the present invention, has excellent adhesion strength, and stability is high.
Description
Technical field
The invention belongs to polymeric material field, more particularly, to a kind of ABS compounds and preparation method and application.
Background technology
The ternary polymerization that acrylonitrile-butadiene-styrene copolymer (ABS) is made of styrene, butadiene, acrylonitrile
Thing, has concentrated the chemicals-resistant characteristic of the high fluidity of styrene, the rubber toughness of butadiene and acrylonitrile, has excellent add
Work performance, resistance to low temperature, electrical insulation capability, resistance to chemical corrosion and high glaze and excellent plating performance, have at the same time
The excellent characteristics such as creep resistant is good, dimensional stability is high, molding shrinkage is small, in storage battery, military project, automobile, electronic apparatus etc.
Field application is very extensive.
ABS material in gluing field using more and more extensive, such as lead-acid accumulator field.Lead-acid battery electrode is mainly by lead
And its oxide is made, electrolyte is a kind of storage battery of sulfuric acid solution.Stored from Frenchman Pulan spy in invention plumbic acid in 1859
Battery, has been subjected to the development course of nearly 150 years, and lead-acid accumulator is in terms of theoretical research, in product category and kind, product
Electric property etc. is obtained for significant progress, whether in traffic, communication, electric power, military or each in navigation, aviation
A economic field, lead-acid accumulator all play indispensable important function.In recent years, the acceleration with urbanization and city
The expansion of scope, the magnitude of traffic flow increase severely.Although the vehicles such as automobile are quickly grown, it is subject to relatively expensive and oily using price
Valency such as goes up at the influence of factor, make electric bicycle with its is spry and light, conveniently, the advantage such as cheap, city's field depth is by wide at home
The welcome of big consumer.Lead-acid accumulator because it is cost-effective, power characteristic is good, self discharge is small, cheap, in recent years electronic
Get back in bicycle application.
ABS material is applied to gluing field, it is necessary to which it possesses high adhesion strength and stability；As lead-acid accumulator is led
Domain ABS material, it is desirable to its initial stage adhesion strength Wei≤76.2Kgf/1.27cm2；And current ABS material on the market, it is viscous
Knotting strength is mostly 50-70Kgf/1.27cm2；It can not meet the requirement of battery field.
The content of the invention
In view of this, the present invention is directed to propose a kind of ABS compounds, realize the excellent antiwear characteristic of material.
To reach above-mentioned purpose, the technical proposal of the invention is realized in this way：
A kind of ABS compounds, the compound are made of the raw material including following parts by weight：
Preferably, the ABS compounds are made of the raw material including following parts by weight：
Further, the ABS resin is the terpolymer of acrylonitrile, butadiene and styrene, wherein, butadiene
Weight percent content is 10-55%, and the weight percent content of acrylonitrile is 15-32%, and the percentage by weight of styrene contains
Measure as 30-70%.
Further, the cohesion modifiers are ethylene-methyl acrylate-glyceryl methacrylate ternary polymerization
Thing；The melt mass flow rate of the cohesion modifiers is 5-10g/10min (190 DEG C/2.16kg).Add to bond and be modified
After agent, hydrogen bond can be formed between resin and adhesive, the formation of a large amount of hydrogen bonds can be between reinforced resin and adhesive
Van der Waals force, so as to improve the adhesion strength of compound.
Further, the modified synergist that bonds is in turpentine oil, coal tar, furfuryl alcohol, castor oil or epoxidized soybean oil
One or more mixtures.After adding high boiling small-molecule substance, the additions of these small-molecule substances can increase point
The locomitivity of subchain, improves flexibility, so that glue-line is not crisp, further improves the adhesion strength of compound.
Further, the auxiliary agent is at least one of heat stabilizer, light stabilizer, processing aid or pigment.Can root
Above-mentioned additive is used alone according to the structure of different products, technical requirements etc., or is used in combination.
Further, the heat stabilizer is one kind or one in the compound of phenols, phosphorous acid esters or thio esters
Compounded more than kind；The light stabilizer is one kind in hindered amines or ultra-violet absorber；The processing aid is low
At least one of molecule esters stearic acid, metallic soap (Cast, Znst), stearic acid complex ester or amide-type (erucyl amide).
The preparation method of the ABS compounds, includes the following steps：
(1) ABS resin, cohesion modifiers, the modified synergist of bonding, auxiliary agent are sufficiently mixed by proportioning in high-speed mixer
10-60 minutes；
(2) said mixture is transported in double screw extruder by feed device, each section of extruder temperature of extruder
Control is between 180-230 DEG C, and the draw ratio of double screw extruder is 25-40, and screw speed is 200-800 revs/min, in spiral shell
Under the shearing of bar, mixing and conveying, material is able to fully fusing, compound, then by extruding pelletization, be dried to obtain ABS compounds；
(3) ABS compounds are added in injection molding machine and are processed into required batten, the injecting condition is：Barrel temperature
190-240 DEG C, 60-70 DEG C of mold temperature, injection pressure 6-10MPa.
The purposes of the ABS compounds, the ABS compounds are applied to battery rubber envelope field.
Relative to the prior art, ABS compounds of the present invention have the advantage that：
(1) ABS compounds excellent in mechanical performance of the present invention, has excellent adhesion strength, and stability is high.
(2) ABS compounds preparation method of the present invention is simple and practicable, handling ease, is very suitable for glue envelope field (such as
Storage battery) promote and apply.
Embodiment
In addition to being defined, technical term used has universal with those skilled in the art of the invention in following embodiments
The identical meanings of understanding.Test reagent used, is routine biochemistry reagent unless otherwise specified in following embodiments；It is described
Experimental method, is conventional method unless otherwise specified.
A kind of ABS compounds, the compound are made of the raw material including following parts by weight：
The preparation method of the ABS compounds, includes the following steps：
(1) ABS resin, cohesion modifiers, the modified synergist of bonding, auxiliary agent are sufficiently mixed by proportioning in high-speed mixer
10-60 minutes；
(2) said mixture is transported in double screw extruder by feed device, each section of extruder temperature of extruder
Control is between 180-230 DEG C, and the draw ratio of double screw extruder is 25-40, and screw speed is 200-800 revs/min, in spiral shell
Under the shearing of bar, mixing and conveying, material is able to fully fusing, compound, then by extruding pelletization, be dried to obtain ABS compounds；
(3) ABS compounds are added in injection molding machine and are processed into required batten, the injecting condition is：Barrel temperature
190-240 DEG C, 60-70 DEG C of mold temperature, injection pressure 6-10MPa.
The purposes of the ABS compounds, the ABS compounds are applied to battery rubber envelope field.
Now the raw material used in embodiment and comparative example are done as described below, but be not limited to these materials：
ABS resin selects strange beautiful ABS AG15A1；
Cohesion modifiers select A Kema AX-8900；
Bonding modified synergist selects Longkou city dragon to reach epoxidized soybean oil；
Auxiliary agent is pigment, the pigment that weight ratio is 1 part is added in embodiment 1-3 and comparative example 1-3, because of the pigment pair
The physical property of composition is not put into table without influence.
The instrument and equipment that the present invention prepares used in composition has：
The flame-retardant modified double screw extruder used of thermoplastic is given birth to by Nanjing Rhea high polymer Equipment Limited
The SHJ-30 of production.
The injection molding machine that thermoplastic test bars use is the B-920 produced by Zhejiang Hai Tian injection molding machines Co., Ltd
Type.
The instrument of test melt flow rate (MFR) is that the ZR21452 of Mei Site industrial systems (China) Co., Ltd production melts
Body flow rate instrument.
The impact experiment machine of test impact strength is the T92 types of Tinius Olsenis companies of U.S. production.
The universal testing machine of test tensile strength is the H10K-S of Hounsfield companies production.
The test method of adhesive strength is：
1st, first resin sheet (i.e. batten, similarly hereinafter) is cut from centre；
2nd, away from making marks at disconnected 10mm, and with 50% ethanol surface；
3rd, solid is dipped using cotton swab, two drop solids is added dropwise in the label range of wherein a piece of resin sheet, are added dropwise
Quality be 0.06-0.08g；
4th, two panels resin sheet is superimposed according to mark and alignd, the mark of two panels resin sheet is bonded together, two
The top pressure of piece resin sheet is improved quality as the special pressing plate of 500g, while ensures that resin sheet is horizontal and not in gap shell tool
Misplace, the solid of spilling is removed；
5th, resin streak is put into drying equipment dry, it is ensured that to ensure to drying equipment is put into from configuration solid
Completed in 10min, drying temperature is 60 DEG C, time 2h；
6th, adhesive property is tested：The dried resin sheet that step 5 is obtained is set under the draw speed of 5mm/min
The adhesive strength of fat piece.
With reference to embodiment, the present invention will be described in detail.
Embodiment 1-3
Described ABS compounds and preparation method and application, its composition of raw materials is as shown in table 1, and its preparation method includes
Following steps：
ABS resin, cohesion modifiers, the modified synergist of bonding, auxiliary agent are sufficiently mixed 10- by proportioning in high-speed mixer
60 minutes；Said mixture is transported in double screw extruder by the feed device of delicate metering, each section of spiral shell of extruder
Bar temperature control is between 180-230 DEG C, and the draw ratio of double screw extruder is 25-40, and screw speed is 200-800 revs/min
Clock, the shearing of screw rod, mixing and conveying under, material be able to fully fusing, it is compound, then by extruding pelletization, be dried to obtain ABS
Compound；ABS compounds are added in injection molding machine and are processed into required batten, the injecting condition is：Barrel temperature 190-240
DEG C, 60-70 DEG C of mold temperature, injection pressure 6-10MPa.
In following embodiments and comparative example, the processing conditions of extruder melting extrusion is as follows：One 180 DEG C of area's temperature, 2nd area
190 DEG C of temperature, three 200 DEG C of area's temperature, four 210 DEG C of area's temperature, five 220 DEG C of area's temperature, six 220 DEG C of area's temperature, seven area's temperature 220
DEG C, eight 220 DEG C of area's temperature, nine 220 DEG C of area's temperature, ten 220 DEG C of area's temperature, 230 DEG C of head temperature；Screw speed is 200-800
Rev/min.The draw ratio of double screw extruder is 40:1.
Comparative example 1
A kind of compound and preparation method and application, its composition of raw materials is as shown in table 1, and its preparation method includes following step
Suddenly：
ABS resin, cohesion modifiers, auxiliary agent are sufficiently mixed 10-60 minutes by proportioning in high-speed mixer；Will be above-mentioned mixed
Compound is transported in double screw extruder by the feed device of delicate metering, and each section of extruder temperature of extruder is controlled in 180-
Between 230 DEG C, the draw ratio of double screw extruder is 25-40, and screw speed is 200-800 revs/min, shearing in screw rod,
Be kneaded and conveying under, material be able to fully fusing, it is compound, then by extruding pelletization, be dried to obtain ABS compounds；ABS is compound
Thing, which is added in injection molding machine, is processed into required batten, and the injecting condition is：190-240 DEG C of barrel temperature, mold temperature 60-70
DEG C, injection pressure 6-10MPa.
In following embodiments and comparative example, the processing conditions of extruder melting extrusion is as follows：One 180 DEG C of area's temperature, 2nd area
190 DEG C of temperature, three 200 DEG C of area's temperature, four 210 DEG C of area's temperature, five 220 DEG C of area's temperature, six 220 DEG C of area's temperature, seven area's temperature 220
DEG C, eight 220 DEG C of area's temperature, nine 220 DEG C of area's temperature, ten 220 DEG C of area's temperature, 230 DEG C of head temperature；Screw speed is 200-800
Rev/min.The draw ratio of double screw extruder is 40:1.
Comparative example 2
A kind of compound and preparation method and application, its composition of raw materials is as shown in table 1, and its preparation method includes following step
Suddenly：
ABS resin, the modified synergist of bonding, auxiliary agent are sufficiently mixed 10-60 minutes by proportioning in high-speed mixer；Will be upper
State mixture to be transported in double screw extruder by the feed device of delicate metering, each section of extruder temperature control of extruder exists
Between 180-230 DEG C, the draw ratio of double screw extruder is 25-40, and screw speed is 200-800 revs/min, in cutting for screw rod
Under cutting, be kneaded and conveying, material be able to fully fusing, it is compound, then by extruding pelletization, be dried to obtain ABS compounds；By ABS
Compound, which is added in injection molding machine, is processed into required batten, and the injecting condition is：190-240 DEG C of barrel temperature, mold temperature
60-70 DEG C, injection pressure 6-10MPa.
In following embodiments and comparative example, the processing conditions of extruder melting extrusion is as follows：One 180 DEG C of area's temperature, 2nd area
190 DEG C of temperature, three 200 DEG C of area's temperature, four 210 DEG C of area's temperature, five 220 DEG C of area's temperature, six 220 DEG C of area's temperature, seven area's temperature 220
DEG C, eight 220 DEG C of area's temperature, nine 220 DEG C of area's temperature, ten 220 DEG C of area's temperature, 230 DEG C of head temperature；Screw speed is 200-800
Rev/min.The draw ratio of double screw extruder is 40:1.
Comparative example 3
A kind of compound and preparation method and application, its composition of raw materials is as shown in table 1, and its preparation method includes following step
Suddenly：
ABS resin, auxiliary agent are sufficiently mixed 10-60 minutes by proportioning in high-speed mixer；By said mixture by essence
The feed device of close metering is transported in double screw extruder, and each section of extruder temperature of extruder is controlled between 180-230 DEG C,
The draw ratio of double screw extruder is 25-40, and screw speed is 200-800 revs/min, in the shearing, mixing and conveying of screw rod
Under, material be able to fully fusing, it is compound, then by extruding pelletization, be dried to obtain ABS compounds；ABS compounds are added to note
Required batten is processed into molding machine, the injecting condition is：190-240 DEG C of barrel temperature, 60-70 DEG C of mold temperature, injection pressure
Power 6-10MPa.
In following embodiments and comparative example, the processing conditions of extruder melting extrusion is as follows：One 180 DEG C of area's temperature, 2nd area
190 DEG C of temperature, three 200 DEG C of area's temperature, four 210 DEG C of area's temperature, five 220 DEG C of area's temperature, six 220 DEG C of area's temperature, seven area's temperature 220
DEG C, eight 220 DEG C of area's temperature, nine 220 DEG C of area's temperature, ten 220 DEG C of area's temperature, 230 DEG C of head temperature；Screw speed is 200-800
Rev/min.The draw ratio of double screw extruder is 40:1.
Each component is specific with when performance test data in 1 embodiment 1-3 of table and comparative example 1-3
From the embodiment and comparative example of table 1 as can be seen that addition cohesion modifiers and bond synergist after, embodiment with
The mechanical property of comparative example is essentially the same, and mechanical property is retainable very well, but adhesion strength differs greatly；Embodiment 1 with it is right
Ratio 1 is compared, and with the addition of 0.1 part of cohesive synergist, and adhesion strength is from 80.5Kgf/1.27cm2Bring up to 83.5Kgf/
1.27cm2；Embodiment 2 with the addition of 5 parts of cohesion modifiers compared with comparative example 2, and adhesion strength is from 75.4Kgf/1.27cm2Improve
To 96.2Kgf/1.27cm2；Embodiment 3 with the addition of 10 parts of cohesion modifiers and 0.5 part of cohesive synergist compared with comparative example 3,
Adhesion strength is from 66.3Kgf/1.27cm2Bring up to 112.3Kgf/1.27cm2。
As can also be seen from Table 1, cohesion modifiers are not added and bond synergist, and the adhesion strength of compound only has
67.5Kgf/1.27cm2, compared from comparative example 1, comparative example 2 with comparative example 3, it can be seen that addition cohesion modifiers or bonding
Synergist can improve the adhesion strength of compound, but add cohesion modifiers at the same time and bond synergist, can cause
The adhesion strength of compound increases substantially.
ABS compounds of the present invention have excellent comprehensive performance, and while adhesion strength is improved, its mechanical property is basic
Remain unchanged, can be applied to glue closure material field (such as storage battery).
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent replacement, improvement and so on, should all be included in the protection scope of the present invention god.
Claims (8)
- A kind of 1. ABS compounds, it is characterised in that：The compound is made of the raw material including following parts by weight：
- 2. ABS compounds according to claim 1, it is characterised in that：The ABS resin for acrylonitrile, butadiene with The terpolymer of styrene, wherein, the weight percent content of butadiene is 10-55%, and the percentage by weight of acrylonitrile contains Measure as 15-32%, the weight percent content of styrene is 30-70%.
- 3. ABS compounds according to claim 1, it is characterised in that：The cohesion modifiers are ethylene-acrylic acid first Ester-glycidyl methacrylate terpolymer；The melt mass flow rate of the cohesion modifiers is 5-10g/ 10min。
- 4. ABS compounds according to claim 1, it is characterised in that：The modified synergist that bonds is turpentine oil, coal One or more mixtures in tar, furfuryl alcohol, castor oil or epoxidized soybean oil.
- 5. ABS compounds according to claim 1, it is characterised in that：The auxiliary agent for heat stabilizer, light stabilizer, At least one of processing aid or pigment.
- 6. ABS compounds according to claim 5, it is characterised in that：The heat stabilizer is phenols, phosphite ester One or more kinds of compoundings in the compound of class or thio esters；The light stabilizer is hindered amines or ultraviolet One kind in absorbent；The processing aid is in low molecule esters stearic acid, metallic soap, stearic acid complex ester or amide-type At least one.
- 7. the preparation method of the ABS compounds any one of claim 1-6, it is characterised in that：Include the following steps：(1) ABS resin, cohesion modifiers, the modified synergist of bonding, auxiliary agent are sufficiently mixed 10- by proportioning in high-speed mixer 60 minutes；(2) said mixture is transported in double screw extruder by feed device, each section of extruder temperature control of extruder Between 180-230 DEG C, the draw ratio of double screw extruder is 25-40, and screw speed is 200-800 revs/min, in screw rod Shearing, be kneaded and conveying under, material be able to fully fusing, it is compound, then by extruding pelletization, be dried to obtain ABS compounds；(3) ABS compounds are added in injection molding machine and are processed into required batten, the injecting condition is：Barrel temperature 190-240 DEG C, 60-70 DEG C of mold temperature, injection pressure 6-10MPa.
- 8. the purposes of the ABS compounds any one of claim 1-6, it is characterised in that：The ABS compound applications Field is sealed in battery rubber.
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| CN201711091780.5A CN107955566A (en) | 2017-11-08 | 2017-11-08 | A kind of ABS compounds and preparation method and application |
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| CN201711091780.5A CN107955566A (en) | 2017-11-08 | 2017-11-08 | A kind of ABS compounds and preparation method and application |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114316503A (en) * | 2021-12-29 | 2022-04-12 | 浙江普利特新材料有限公司 | High-heat-resistance modified ABS material strongly bonded with PUR and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105482352A (en) * | 2015-12-17 | 2016-04-13 | 厦门美佳美新材料科技有限公司 | Novel pearly-luster ABS material and processing method |
| CN106854338A (en) * | 2016-12-25 | 2017-06-16 | 合肥会通新材料有限公司 | A kind of high rigidity scratch-resistant ABS material and preparation method thereof |
| CN107163486A (en) * | 2017-05-24 | 2017-09-15 | 广东圆融新材料有限公司 | A kind of ultra-toughness, resistance to braking fluid ABS/PBT alloy materials and preparation method thereof |
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2017
- 2017-11-08 CN CN201711091780.5A patent/CN107955566A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105482352A (en) * | 2015-12-17 | 2016-04-13 | 厦门美佳美新材料科技有限公司 | Novel pearly-luster ABS material and processing method |
| CN106854338A (en) * | 2016-12-25 | 2017-06-16 | 合肥会通新材料有限公司 | A kind of high rigidity scratch-resistant ABS material and preparation method thereof |
| CN107163486A (en) * | 2017-05-24 | 2017-09-15 | 广东圆融新材料有限公司 | A kind of ultra-toughness, resistance to braking fluid ABS/PBT alloy materials and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114316503A (en) * | 2021-12-29 | 2022-04-12 | 浙江普利特新材料有限公司 | High-heat-resistance modified ABS material strongly bonded with PUR and preparation method thereof |
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Application publication date: 20180424 |