Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (12): 87-93.doi: 10.13475/j.fzxb.20200300808

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Preparation and properties of conveyor belt reinforced by F-12 aramid fabric

LI Meizhen1(), ZHAO Shiyi1, FENG Yanli2, GUO Xiaoqing1, YU Xiaoqing1   

  1. 1. College of Textile and Light Industry, Inner Mongolia University of Technology, Hohhot, Inner Mongolia 010051, China
    2. The Sixth Academy of China Aerospace Science and Industry Corporation Limited, Hohhot, Inner Mongolia 010010, China
  • Received:2020-03-03 Revised:2020-09-09 Online:2020-12-15 Published:2020-12-23

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Abstract:

In order to improve the adhesion between F-12 aramid fabric and rubber in conveyor belt, epoxy resin and coupling agent A187 were used to modify the fabric. The optimum dosage of epoxy was determined by film forming analysis. The optimum dosage of coupling agent A187 was determined by measuring the hydrophilic height of the modified fabric and the tensile strength of the modified fabric after immersion in resorcinol formaldehyde resin emulsion. Based on the above, the modification of the fabric was vulcanized, and the optimal modification process was determined by testing the peel strength between the fabric and rubber. The results show that when the content of epoxy resin is 25% (o.w.f) and the content of coupling agent A187 is 1.2% (o.w.f), the comprehensive performance of the F-12 aramid fabric conveyor belt is the best. It is found that the fabric with the lowest hydrophilic value turns to have the highest peel strength of 12.1 N/mm, which is higher than what is required in the industry standard. The tensile strength and elongation at break of the single layer conveyor belt are 6 495.25 N and 13% respectively, and 14 493.25 N and 14% for the double layer belt.

Key words: F-12 aramid fabric, epoxy resin, coupling agent A187, conveyor belt, peel strength

CLC Number: 

  • TS193.5

Fig.1

“H” extracted model (a) and molded samples (b)"

Tab.1

Mechanical properties of common filaments for convey core"

纤维
名称		 线密度/
dtex		 断裂强度/
(cN·dtex-1)		 断裂伸长
率/%		 初始模
量/GPa
F-12芳纶 1 100 24.43 2.87 134.52
芳纶Ⅱ 1 100 18.61 2.14 123.00
涤纶 1 100 6.91 12.35 12.09
锦纶66 1 400 7.71 15.58 11.36

Tab.2

“H” extraction experiment results N"

样品类型 纤维名称 断裂强力 “H”抽出强力
单束丝 Kevlar 213.2 —
芳纶Ⅱ 252.9 —
F-12芳纶 294.9 —
帘子线 Kevlar 524.7 —
芳纶Ⅱ 532.8 —
F-12芳纶 577.1 —
二浴改性帘子线 Kevlar 373.3 125.4±3.31
芳纶Ⅱ 370.1 139.5±3.45
F-12芳纶 515.3 167.6±3.58

Tab.3

Mechanical properties of F-12 aramid filaments at different twists"

捻度/
(捻·10 cm-1)		 断裂强
力/N		 断裂伸
长率/%		 初始模
量/GPa		 “H”抽出
力/N
0 222.50 2.85 134.52 120.5
4 227.66 2.67 137.58 122.5
6 263.60 2.87 137.06 125.8
8 270.65 2.98 137.24 121.7
10 260.82 2.94 133.53 121.3

Tab.4

Mechanical properties of F-12 aramid filaments"

改性方式 断裂强度/(cN·dtex-1) 断裂伸长率/%
未处理样品 22.91±1.04 1.50±0.37
一浴改性处理样品 18.98±2.21 3.14±0.80
二浴改性处理样品 24.58±2.66 2.85±0.19

Fig.2

SEM images of modified fiber surface after one-bath modification(×1 000)"

Fig.3

Influence of amount of coupling agent on hydrophilic height of fabric after one-bath modification and drawing strength of filament after two-bath modification"

Fig.4

Effect of amount of cross-linking agent on strength of filament after two-bath modification"

Tab.5

Tensile property of F-12 aramid fabric"

处理方法 试样厚度/mm 断裂强度/MPa 断裂伸长率/%
未改性织物 0.58±0.03 441.91±7.61 11.0±0.93
一浴改性织物 0.59±0.03 658.98±8.54 9.10±1.21
二浴改性织物 0.53±0.03 586.86±9.16 7.10±1.17

Fig.5

Coating of belt samples after peeling off. (a) Original sample; (b) Sample after two bath modification"

Fig.6

Peeling curve of conveyor belt sample"

Fig.7

Stripping curve of belt samples before and after aging"

Fig.8

Overlapping of conveyor belt samples before (a) and after (b) aging"

Fig.9

Stress-strain curves of conveyor belt"

Tab.6

Tensile property of belt samples"

铺层
方式		 厚度/
mm		 断裂强
力/N		 断裂强
度/MPa		 断裂伸长
率/%
单层 7.6 6 495.25 95.00 13
双层 8.5 14 493.25 187.08 14

Fig.10

Stripping curve of conveyor belt after 10 000 (a) and 20 000 (b) times fatigue"

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