CN103665490A - Reversion-resistant crown compound for solid tyres of crane cars - Google Patents
Reversion-resistant crown compound for solid tyres of crane cars Download PDFInfo
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- CN103665490A CN103665490A CN201310620381.9A CN201310620381A CN103665490A CN 103665490 A CN103665490 A CN 103665490A CN 201310620381 A CN201310620381 A CN 201310620381A CN 103665490 A CN103665490 A CN 103665490A
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- reversion
- resistance
- liftmobile
- solid tyre
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Abstract
The invention belongs to the technical field of rubber production, and particularly relates to a reversion-resistant crown compound for solid tyres of crane cars. The reversion-resistant crown compound for the solid tyres of the crane cars comprises raw materials in parts by weight as follows: butadiene styrene rubber, natural rubber, carbon black N339, naphthenic oil, poly-2,3,4-trimethyl-1,2-dihydroquinoline, N-(1,3-dimethyl)-N'-phenyl-p-phenylenediamine, zinc oxide, zinc stearate, N-hydroxy divinyl benzothiazole-2-sulfenamide, sulfur, an anti-scorching agent, flaky mica and polyethylene fibers. The crown compound has the good reversion resistance, and meanwhile, the rebound resilience, the abrasion resistance, the tearing strength and the like of vulcanized rubber can also be kept well.
Description
Technical field
The invention belongs to the technical field of rubber production, be specifically related to a kind of crown glue of the resistance to reversion for liftmobile solid tyre.
Background technology
Liftmobile solid tyre requires to have lower rolling resistance, object is to guarantee that the speed of vehicle and working hour reach greatest limit, although tire tread shape, crown radius of the radian, tread design and tread thickness and these performances of acquisition have much relations, obtain best effect and also must adopt suitable sizing compound formula.The liftmobile work that in use overloads often, this has just caused the distortion of tire and creep effect to increase, and along with distortion and creep effect increase, the rolling resistance of tire also can increase thereupon, and consequently Vehicle Speed reduces, energy expenditure acceleration.Although by selecting suitable kind of carbon black and consumption can obtain the good high-module sizing material of reinforcing property, can reduce the distortion of tire simultaneously, but the increase of hysteresis loss also can affect rolling resistance, therefore will between high-module and low hysteresis loss, average out, solid tyre also must have good wear resistance and tear strength.
Solid tyre need to be longer curing time guarantee tread rubber centre reach desirable state of vulcanization, this long-time sulfuration has a significant impact the performance of tire, can cause generation over cure in tread surface and tyre surface bottom certain depth, although reversion there is no obvious decline at look-up table surface hardness conventionally, but in tire used process under dynamic condition, hardness and modulus rapidly decline can cause abrasion to be accelerated, rolling resistance increases and heat-dissipating increases, and heat-dissipating can make modulus and hardness further decline.
In sum, solid tyre must have following performance if meet the requirement of low-rolling-resistance: 1. good resistance to overcure-reversion; 2, high-module and low hysteresis loss; 3, good wear resistant.
Summary of the invention
The object of the invention is to for the defect of above-mentioned existence and a kind of crown glue of the resistance to reversion for liftmobile solid tyre is provided, this crown glue not only has good resistance to overcure-reversion, and rebound resilience, wear resistant and the tearing toughness etc. of cross-linked rubber still can keep preferably simultaneously.
Technical scheme of the present invention is: a kind of crown glue of the resistance to reversion for liftmobile solid tyre, is comprised of following raw materials in parts by weight proportioning:
50～70 parts, styrene-butadiene rubber(SBR)
30～50 parts of natural rubbers
20～30 parts of carbon black N339
5～10 parts of naphthenic oils
Gather-2,3,4-trimethylammonium-1,1.0～1.5 parts of 2-dihydroquinoline
N-(1,3-dimethyl)-N '-phenyl-Ursol D is 1.0～1.5 parts
4～8 parts, zinc oxide
6～8 parts of Zinic stearass
1.0～1.8 parts of N-hydroxyl divinyl thiazole-2-sulphenamides
1.0～2.0 parts of Sulfurs
0.1～0.2 part of scorch retarder
40～60 parts of sheet mica
7～12 parts of polyethylene fibres.
The crown glue of the described resistance to reversion for liftmobile solid tyre, is comprised of following raw materials in parts by weight proportioning:
53 parts, styrene-butadiene rubber(SBR)
35 parts of natural rubbers
23 parts of carbon black N339
5.6 parts of naphthenic oils
Gather-2,3,4-trimethylammonium-1,1.1 parts of 2-dihydroquinoline
N-(1,3-dimethyl)-N '-phenyl-Ursol D is 1.2 parts
4.8 parts, zinc oxide
6.8 parts of Zinic stearass
1.8 parts of N-hydroxyl divinyl thiazole-2-sulphenamides
1.2 parts of Sulfurs
0.15 part of scorch retarder
43 parts of sheet mica
7.2 parts of polyethylene fibres.
The crown glue of the described resistance to reversion for liftmobile solid tyre, is comprised of following raw materials in parts by weight proportioning:
62 parts, styrene-butadiene rubber(SBR)
41 parts of natural rubbers
27 parts of carbon black N339
6.8 parts of naphthenic oils
Gather-2,3,4-trimethylammonium-1,1.2 parts of 2-dihydroquinoline
N-(1,3-dimethyl)-N '-phenyl-Ursol D is 1.3 parts
5 parts, zinc oxide
7.1 parts of Zinic stearass
1.6 parts of N-hydroxyl divinyl thiazole-2-sulphenamides
1.8 parts of Sulfurs
0.14 part of scorch retarder
52 parts of sheet mica
11.7 parts of polyethylene fibres.
The crown glue of the described resistance to reversion for liftmobile solid tyre, is comprised of following raw materials in parts by weight proportioning:
55 parts, styrene-butadiene rubber(SBR)
39 parts of natural rubbers
22 parts of carbon black N339
8.3 parts of naphthenic oils
Gather-2,3,4-trimethylammonium-1,1.34 parts of 2-dihydroquinoline
N-(1,3-dimethyl)-N '-phenyl-Ursol D is 1.1 parts
6.7 parts, zinc oxide
6.8 parts of Zinic stearass
1.4 parts of N-hydroxyl divinyl thiazole-2-sulphenamides
1.6 parts of Sulfurs
0.16 part of scorch retarder
55 parts of sheet mica
9.3 parts of polyethylene fibres.
The crown glue of the described resistance to reversion for liftmobile solid tyre, is comprised of following raw materials in parts by weight proportioning:
68 parts, styrene-butadiene rubber(SBR)
48 parts of natural rubbers
27 parts of carbon black N339
9.2 parts of naphthenic oils
Gather-2,3,4-trimethylammonium-1,1.26 parts of 2-dihydroquinoline
N-(1,3-dimethyl)-N '-phenyl-Ursol D is 1.42 parts
5.9 parts, zinc oxide
6.3 parts of Zinic stearass
1.25 parts of N-hydroxyl divinyl thiazole-2-sulphenamides
1.74 parts of Sulfurs
0.16 part of scorch retarder
58.2 parts of sheet mica
11.9 parts of polyethylene fibres.
The aspect ratio of described sheet mica is 5～25.
Described polyethylene fibre mean length is 2～5mm.
Beneficial effect of the present invention is: the crown glue of the resistance to reversion for liftmobile solid tyre of the present invention, at 160 ℃, vulcanize after 60 minutes, reversion percentage drops to 1～3%, and regular convention formula under the same conditions reversion percentage be 35～40%, the resistance to reversion performance of visible crown glue of the present invention increases substantially.
Crown glue 100% fixed stretching strength of the described resistance to reversion for liftmobile solid tyre is 4.0～5.0MPa, and conservation rate is 94%～98%; 300% fixed stretching strength is 16～18MPa, and conservation rate is 97%～99%; Tensile strength is 27～28.7MPa, and conservation rate is 98.5%～100%; Tensile yield is 480%～520%, and conservation rate is 98.5%～100%; At 25 ℃, rebound resilience is 70%～73%, and conservation rate is 96%～98%; Wear index 93～96, conservation rate is that 100%, C shape of the mouth as one speaks tear strength is 109～112N/mm, conservation rate is 90%～95%.
In sum, described crown glue not only has good resistance to overcure-reversion, and rebound resilience, wear resistant and the tearing toughness etc. of cross-linked rubber still can keep preferably simultaneously.
Embodiment
Below by specific embodiment, the present invention will be described in detail.
Embodiment 1
A crown glue for the resistance to reversion of liftmobile solid tyre, is comprised of following raw materials in parts by weight proportioning:
50 parts, styrene-butadiene rubber(SBR)
30 parts of natural rubbers
20 parts of carbon black N339
5 parts of naphthenic oils
Gather-2,3,4-trimethylammonium-1,1.0 parts of 2-dihydroquinoline
N-(1,3-dimethyl)-N '-phenyl-Ursol D is 1.0 parts
4 parts, zinc oxide
6 parts of Zinic stearass
1.0 parts of N-hydroxyl divinyl thiazole-2-sulphenamides
1.0 parts of Sulfurs
0.1 part of scorch retarder
40 parts of sheet mica
7 parts of polyethylene fibres.
The aspect ratio of described sheet mica is 5.
Described polyethylene fibre mean length is 2mm.
Adopt described in embodiment 1 the crown glue for the resistance to reversion of liftmobile solid tyre, at 160 ℃, vulcanize after 60 minutes, reversion percentage drops to 1%.100% fixed stretching strength is 4.0MPa, and conservation rate is 94%; 300% fixed stretching strength is 16MPa, and conservation rate is 97%; Tensile strength is 27MPa, and conservation rate is 98.5%; Tensile yield is 480%, and conservation rate is 98.5%; At 25 ℃, rebound resilience is 70%, and conservation rate is 96%; Wear index 93, conservation rate is that 100%, C shape of the mouth as one speaks tear strength is 109N/mm, conservation rate is 90%.
Embodiment 2
The crown glue of the described resistance to reversion for liftmobile solid tyre, is comprised of following raw materials in parts by weight proportioning:
53 parts, styrene-butadiene rubber(SBR)
35 parts of natural rubbers
23 parts of carbon black N339
5.6 parts of naphthenic oils
Gather-2,3,4-trimethylammonium-1,1.1 parts of 2-dihydroquinoline
N-(1,3-dimethyl)-N '-phenyl-Ursol D is 1.2 parts
4.8 parts, zinc oxide
6.8 parts of Zinic stearass
1.8 parts of N-hydroxyl divinyl thiazole-2-sulphenamides
1.2 parts of Sulfurs
0.15 part of scorch retarder
43 parts of sheet mica
7.2 parts of polyethylene fibres.
The aspect ratio of described sheet mica is 18.
Described polyethylene fibre mean length is 3.6mm.
Adopt described in embodiment 2 the crown glue for the resistance to reversion of liftmobile solid tyre, at 160 ℃, vulcanize after 60 minutes, reversion percentage drops to 1.8%.100% fixed stretching strength is 4.4MPa, and conservation rate is 96.2%; 300% fixed stretching strength is 17.5MPa, and conservation rate is 98.2%; Tensile strength is 27.8MPa, and conservation rate is 98.9%; Tensile yield is 500%, and conservation rate is 99.5%; At 25 ℃, rebound resilience is 71.5%, and conservation rate is 96.8%; Wear index 94.5, conservation rate is that 100%, C shape of the mouth as one speaks tear strength is 110N/mm, conservation rate is 90%～95%.
Embodiment 3
The crown glue of the described resistance to reversion for liftmobile solid tyre, is comprised of following raw materials in parts by weight proportioning:
62 parts, styrene-butadiene rubber(SBR)
41 parts of natural rubbers
27 parts of carbon black N339
6.8 parts of naphthenic oils
Gather-2,3,4-trimethylammonium-1,1.2 parts of 2-dihydroquinoline
N-(1,3-dimethyl)-N '-phenyl-Ursol D is 1.3 parts
5 parts, zinc oxide
7.1 parts of Zinic stearass
1.6 parts of N-hydroxyl divinyl thiazole-2-sulphenamides
1.8 parts of Sulfurs
0.14 part of scorch retarder
52 parts of sheet mica
11.7 parts of polyethylene fibres.
The aspect ratio of described sheet mica is 14.
Described polyethylene fibre mean length is 3.3mm.
Adopt described in embodiment 3 the crown glue for the resistance to reversion of liftmobile solid tyre, at 160 ℃, vulcanize after 60 minutes, reversion percentage drops to 1.6%.100% fixed stretching strength is 4.2MPa, and conservation rate is 97.5%; 300% fixed stretching strength is 17.6MPa, and conservation rate is 98.8%; Tensile strength is 28.3MPa, and conservation rate is 98.7%; Tensile yield is 510.5%, and conservation rate is 99.1%; At 25 ℃, rebound resilience is 72.4%, and conservation rate is 96.8%; Wear index 94.8, conservation rate is that 100%, C shape of the mouth as one speaks tear strength is 109.8N/mm, conservation rate is 93.6%.
Embodiment 4
The crown glue of the described resistance to reversion for liftmobile solid tyre, is comprised of following raw materials in parts by weight proportioning:
55 parts, styrene-butadiene rubber(SBR)
39 parts of natural rubbers
22 parts of carbon black N339
8.3 parts of naphthenic oils
Gather-2,3,4-trimethylammonium-1,1.34 parts of 2-dihydroquinoline
N-(1,3-dimethyl)-N '-phenyl-Ursol D is 1.1 parts
6.7 parts, zinc oxide
6.8 parts of Zinic stearass
1.4 parts of N-hydroxyl divinyl thiazole-2-sulphenamides
1.6 parts of Sulfurs
0.16 part of scorch retarder
55 parts of sheet mica
9.3 parts of polyethylene fibres.
The aspect ratio of described sheet mica is 21.
Described polyethylene fibre mean length is 4.5mm.
Adopt described in embodiment 4 the crown glue for the resistance to reversion of liftmobile solid tyre, at 160 ℃, vulcanize after 60 minutes, reversion percentage drops to 2.9%.100% fixed stretching strength is 4.6MPa, and conservation rate is 95.3%; 300% fixed stretching strength is 16.2MPa, and conservation rate is 98.6%; Tensile strength is 28.5MPa, and conservation rate is 99.5%; Tensile yield is 491%, and conservation rate is 99.8%; At 25 ℃, rebound resilience is 72.6%, and conservation rate is 97.8%; Wear index 95, conservation rate is that 100%, C shape of the mouth as one speaks tear strength is 111N/mm, conservation rate is 94.6%.
Embodiment 5
The crown glue of the described resistance to reversion for liftmobile solid tyre, is comprised of following raw materials in parts by weight proportioning:
68 parts, styrene-butadiene rubber(SBR)
48 parts of natural rubbers
27 parts of carbon black N339
9.2 parts of naphthenic oils
Gather-2,3,4-trimethylammonium-1,1.26 parts of 2-dihydroquinoline
N-(1,3-dimethyl)-N '-phenyl-Ursol D is 1.42 parts
5.9 parts, zinc oxide
6.3 parts of Zinic stearass
1.25 parts of N-hydroxyl divinyl thiazole-2-sulphenamides
1.74 parts of Sulfurs
0.16 part of scorch retarder
58.2 parts of sheet mica
11.9 parts of polyethylene fibres.
The aspect ratio of described sheet mica is 24.6.
Described polyethylene fibre mean length is 4.1mm.
Adopt described in embodiment 5 the crown glue for the resistance to reversion of liftmobile solid tyre, at 160 ℃, vulcanize after 60 minutes, reversion percentage drops to 2.8%.100% fixed stretching strength is 4.3MPa, and conservation rate is 96.8%; 300% fixed stretching strength is 17.3MPa, and conservation rate is 98.5%; Tensile strength is 28MPa, and conservation rate is 99.5%; Tensile yield is 513%, and conservation rate is 99.6%; At 25 ℃, rebound resilience is 73%, and conservation rate is 98%; Wear index 96, conservation rate is that 100%, C shape of the mouth as one speaks tear strength is 112N/mm, conservation rate is 95%.
Embodiment 6
A crown glue for the resistance to reversion of liftmobile solid tyre, is comprised of following raw materials in parts by weight proportioning:
70 parts, styrene-butadiene rubber(SBR)
50 parts of natural rubbers
30 parts of carbon black N339
10 parts of naphthenic oils
Gather-2,3,4-trimethylammonium-1,1.5 parts of 2-dihydroquinoline
N-(1,3-dimethyl)-N '-phenyl-Ursol D is 1.5 parts
8 parts, zinc oxide
8 parts of Zinic stearass
1.8 parts of N-hydroxyl divinyl thiazole-2-sulphenamides
2.0 parts of Sulfurs
0.2 part of scorch retarder
60 parts of sheet mica
12 parts of polyethylene fibres.
The aspect ratio of described sheet mica is 25.
Described polyethylene fibre mean length is 5mm.
Adopt described in embodiment 6 the crown glue for the resistance to reversion of liftmobile solid tyre, at 160 ℃, vulcanize after 60 minutes, reversion percentage drops to 3%.100% fixed stretching strength is 5.0MPa, and conservation rate is 98%; 300% fixed stretching strength is 18MPa, and conservation rate is 99%; Tensile strength is 28.7MPa, and conservation rate is 100%; Tensile yield is 520%, and conservation rate is 100%; At 25 ℃, rebound resilience is 73%, and conservation rate is 98%; Wear index 96, conservation rate is that 100%, C shape of the mouth as one speaks tear strength is 112N/mm, conservation rate is 95%.
Claims (7)
1. for a crown glue for the resistance to reversion of liftmobile solid tyre, it is characterized in that, by following raw materials in parts by weight proportioning, formed:
50～70 parts, styrene-butadiene rubber(SBR)
30～50 parts of natural rubbers
20～30 parts of carbon black N339
5～10 parts of naphthenic oils
Gather-2,3,4-trimethylammonium-1,1.0～1.5 parts of 2-dihydroquinoline
N-(1,3-dimethyl))-N '-phenyl-Ursol D is 1.0～1.5 parts
4～8 parts, zinc oxide
6～8 parts of Zinic stearass
1.0～1.8 parts of N-hydroxyl divinyl thiazole-2-sulphenamides
1.0～2.0 parts of Sulfurs
0.1～0.2 part of scorch retarder
40～60 parts of sheet mica
7～12 parts of polyethylene fibres.
2. according to claim 1 for the crown glue of the resistance to reversion of liftmobile solid tyre, it is characterized in that, by following raw materials in parts by weight proportioning, formed:
53 parts, styrene-butadiene rubber(SBR)
35 parts of natural rubbers
23 parts of carbon black N339
5.6 parts of naphthenic oils
Gather-2,3,4-trimethylammonium-1,1.1 parts of 2-dihydroquinoline
N-(1,3-dimethyl)-N '-phenyl-Ursol D is 1.2 parts
4.8 parts, zinc oxide
6.8 parts of Zinic stearass
1.8 parts of N-hydroxyl divinyl thiazole-2-sulphenamides
1.2 parts of Sulfurs
0.15 part of scorch retarder
43 parts of sheet mica
7.2 parts of polyethylene fibres.
3. according to claim 1 for the crown glue of the resistance to reversion of liftmobile solid tyre, it is characterized in that, by following raw materials in parts by weight proportioning, formed:
62 parts, styrene-butadiene rubber(SBR)
41 parts of natural rubbers
27 parts of carbon black N339
6.8 parts of naphthenic oils
Gather-2,3,4-trimethylammonium-1,1.2 parts of 2-dihydroquinoline
N-(1,3-dimethyl)-N '-phenyl-Ursol D is 1.3 parts
5 parts, zinc oxide
7.1 parts of Zinic stearass
1.6 parts of N-hydroxyl divinyl thiazole-2-sulphenamides
1.8 parts of Sulfurs
0.14 part of scorch retarder
52 parts of sheet mica
11.7 parts of polyethylene fibres.
4. according to claim 1 for the crown glue of the resistance to reversion of liftmobile solid tyre, it is characterized in that, by following raw materials in parts by weight proportioning, formed:
55 parts, styrene-butadiene rubber(SBR)
39 parts of natural rubbers
22 parts of carbon black N339
8.3 parts of naphthenic oils
Gather-2,3,4-trimethylammonium-1,1.34 parts of 2-dihydroquinoline
N-(1,3-dimethyl)-N '-phenyl-Ursol D is 1.1 parts
6.7 parts, zinc oxide
6.8 parts of Zinic stearass
1.4 parts of N-hydroxyl divinyl thiazole-2-sulphenamides
1.6 parts of Sulfurs
0.16 part of scorch retarder
55 parts of sheet mica
9.3 parts of polyethylene fibres.
5. according to claim 1 for the crown glue of the resistance to reversion of liftmobile solid tyre, it is characterized in that, by following raw materials in parts by weight proportioning, formed:
68 parts, styrene-butadiene rubber(SBR)
48 parts of natural rubbers
27 parts of carbon black N339
9.2 parts of naphthenic oils
Gather-2,3,4-trimethylammonium-1,1.26 parts of 2-dihydroquinoline
N-(1,3-dimethyl)-N '-phenyl-Ursol D is 1.42 parts
5.9 parts, zinc oxide
6.3 parts of Zinic stearass
1.25 parts of N-hydroxyl divinyl thiazole-2-sulphenamides
1.74 parts of Sulfurs
0.16 part of scorch retarder
58.2 parts of sheet mica
11.9 parts of polyethylene fibres.
6. according to claim 1 for the crown glue of the resistance to reversion of liftmobile solid tyre, it is characterized in that, the aspect ratio of described sheet mica is 5～25.
7. according to claim 1 for the crown glue of the resistance to reversion of liftmobile solid tyre, it is characterized in that, described polyethylene fibre mean length is 2～5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310620381.9A CN103665490B (en) | 2013-11-29 | 2013-11-29 | A kind of crown of the reversion-resistant for liftmobile solid tyre |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310620381.9A CN103665490B (en) | 2013-11-29 | 2013-11-29 | A kind of crown of the reversion-resistant for liftmobile solid tyre |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103665490A true CN103665490A (en) | 2014-03-26 |
| CN103665490B CN103665490B (en) | 2016-02-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310620381.9A Expired - Fee Related CN103665490B (en) | 2013-11-29 | 2013-11-29 | A kind of crown of the reversion-resistant for liftmobile solid tyre |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11348513A (en) * | 1998-06-15 | 1999-12-21 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| EP1048691A1 (en) * | 1999-04-30 | 2000-11-02 | Bridgestone Corporation | Rubber composition for tires and pneumatic tire |
| JP2003292685A (en) * | 2002-04-08 | 2003-10-15 | Sumitomo Rubber Ind Ltd | Rubber composition for tire |
| CN101821115A (en) * | 2007-10-18 | 2010-09-01 | 住友橡胶工业株式会社 | Tire |
| CN102311564A (en) * | 2010-06-29 | 2012-01-11 | 冯高明 | Rubber for rubber fender |
| CN103012869A (en) * | 2012-12-10 | 2013-04-03 | 固铂成山(山东)轮胎有限公司 | Raw material formula of type-A automobile tire |
-
2013
- 2013-11-29 CN CN201310620381.9A patent/CN103665490B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11348513A (en) * | 1998-06-15 | 1999-12-21 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| EP1048691A1 (en) * | 1999-04-30 | 2000-11-02 | Bridgestone Corporation | Rubber composition for tires and pneumatic tire |
| JP2003292685A (en) * | 2002-04-08 | 2003-10-15 | Sumitomo Rubber Ind Ltd | Rubber composition for tire |
| CN101821115A (en) * | 2007-10-18 | 2010-09-01 | 住友橡胶工业株式会社 | Tire |
| CN102311564A (en) * | 2010-06-29 | 2012-01-11 | 冯高明 | Rubber for rubber fender |
| CN103012869A (en) * | 2012-12-10 | 2013-04-03 | 固铂成山(山东)轮胎有限公司 | Raw material formula of type-A automobile tire |
Non-Patent Citations (1)
| Title |
|---|
| 门秀琴等: "一种经济型全钢载重子午线轮胎胎冠胶的开发", 《宁夏工程技术》 * |
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| CN103665490B (en) | 2016-02-10 |
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