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Nomex fibre surface modifying method

A polyaramid fiber and surface modification technology, applied in the field of surface modification of polyaramid fiber, can solve the problems of complicated operation, uneven performance and high cost

Inactive Publication Date: 2005-05-11
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This modification method overcomes the shortcomings of previous modification methods such as complicated operation, harsh conditions, uneven performance, high cost, and incapability of mass production. It has the characteristics of simple operation and is suitable for large-scale industrial production.

Method used

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  • Nomex fibre surface modifying method
  • Nomex fibre surface modifying method
  • Nomex fibre surface modifying method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] Evenly cut 80 cm long Kevlar29 fiber, 1500 denier. Air-dried at room temperature and weighed.

[0079] Weigh a certain amount of 2,4-toluene diisocyanate and pour it into a beaker, the amount is based on the amount that can completely immerse the fiber, and heat the solution to 70°C. After the temperature is constant, put the fiber in a beaker in a natural state, and make it completely immersed in 2,4-toluene diisocyanate, react for 1 hour, take out the fiber, and wash it twice with deionized water and anhydrous acetone in turn , dry with cold air, and after the weight is constant, measure the strength of the modified fiber, the bonding strength between the modified fiber and epoxy resin, and the water absorption of the modified fiber after being boiled at 95°C for 10 hours and 95°C Fiber strength after boiling for 10 hours and 55 hours.

Embodiment 2

[0081] As described in Example 1, the temperature was increased to 80° C., and the rest of the operations were unchanged.

Embodiment 3

[0083] As described in Example 1, the temperature was increased to 90° C., and the rest of the operations were unchanged.

[0084] The water absorption data and fiber strength data of the modified fibers obtained in Examples 1, 2, and 3 were compared with those of unmodified fibers. The comparison of water absorption is shown in Table 1.

[0085] Processing temperature

unmodified fiber

70℃

80℃

90℃

Water absorption at 95°C for 10 hours

3.50％

0.75％

0.81％

1.10％

Decrease rate of fiber water absorption after modification

-

78.5％

76.8％

68.6％

[0086] The strength of the modified fiber and the comparison of the strength after water absorption are shown in Table 2.

[0087] Processing temperature

unmodified fiber

70℃

80℃

90℃

treated fiber * intensity

(cN)

31.1

29.3

28.8

29.1

...

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Abstract

A surface modifying process for the polyarylamide fibre is disclosed, which is aimed at decreasing its hydroscopicity by 50-80%, increasing its strength after it absorbs water by 20-30% and improving the binding strength between fibre and resin by 10-20%.

Description

technical field [0001] The invention relates to a method for surface modification of polyaramid fibers. Background technique [0002] Polyaramid fibers are widely used as reinforcing materials for composite materials, sewing threads for various components, textiles and bulletproof materials. After sewing, the mechanical properties of composite laminates have been significantly improved, but because the polyaramid fibers contain amide groups, which are very easy to absorb water, the performance of composite materials and sewing parts has dropped significantly. In addition, due to the high crystallinity of the polyaramid fiber itself, it has poor wettability with most resin matrices, so after it is made into a composite material, the interface performance of the material is very poor. These shortcomings of polyaramid fiber greatly affect its application. Therefore, how to improve the water absorption and interfacial properties of polyaramid fibers has received great attentio...

Claims

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Application Information

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IPC IPC(8): D01F6/60D06M13/432
Inventor 郑光黄鹏程
Owner BEIHANG UNIV
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