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High-performance rubber composite material containing Kevlar nano-fibers and preparation method thereof

A technology of nanofibers and composite materials, applied in the field of rubber composite materials with high mechanical properties and its preparation, which can solve the environmental hazards of organic solvents and other problems, and achieve the effect of improving mechanical properties, high strength, and good stability

Active Publication Date: 2018-08-21
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since Kevlar nanofibers can only be dispersed in DMSO solution, polymer composites must be prepared by solution blending, and the use of a large amount of organic solvents brings serious harm to the environment.

Method used

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  • High-performance rubber composite material containing Kevlar nano-fibers and preparation method thereof
  • High-performance rubber composite material containing Kevlar nano-fibers and preparation method thereof
  • High-performance rubber composite material containing Kevlar nano-fibers and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take 1 part of the aqueous dispersion of Kevlar nanofibers, mix it with XNBR rubber latex, add anti-aging agent, stir for 1 hour, adjust the pH value to 2, and add 10wt% NaCl aqueous solution, gel washing, 100°C Drying for 2 hours under the hood to obtain a mixture of XNBR containing Kevlar nanofibers. The dried gel is kneaded on an open mill. The components and their proportions in the rubber compound are: 100 parts of rubber, 0.5 part of anti-aging agent WL, 1 part of vulcanizing agent DCP, and 1 part of Kevlar nanofiber. After the mixed rubber was parked for 24 hours, its positive vulcanization time at 165°C was measured by a vulcanizer, and finally it was vulcanized on a 50t flat vulcanizer to obtain an XNBR composite material containing 1 part of Kevlar nanofibers. The tensile strength of the composite material is 9.82MPa, the elongation at break is 162%, the 100% modulus is 4.88MPa, the 300% modulus is 9.71MPa, and the tear strength is 25.47KN / m.

Embodiment 2

[0028] Take 3 parts of the aqueous dispersion of Kevlar nanofibers, mix it with XNBR latex, add anti-aging agent, stir for 2 hours, adjust the pH value to 2.5, add 12wt% KCl aqueous solution, wash the gel, and dry at 110°C After 2.5h, a mixture of XNBR containing Kevlar nanofibers was obtained. The dried gel is kneaded on an open mill. The components and their proportions in the rubber compound are: 100 parts of rubber, 1 part of anti-aging agent RD, 3 parts of vulcanizing agent DTBP, and 3 parts of Kevlar nanofiber. Other conditions are the same as example 1. The XNBR composite material containing 3 parts of Kevlar nanofibers has a tensile strength of 10.74MPa, an elongation at break of 152%, a 100% modulus of 7.60MPa, a 300% modulus of 10.49MPa, and a tear strength of 28.36KN / m.

Embodiment 3

[0030] Take 5 parts of the aqueous dispersion of Kevlar nanofibers, mix it with XNBR latex, add anti-aging agent, stir for 1.5h, adjust the pH value to 3, and add 4wt% NaCl and 4wt% CaCl 2 The aqueous solution was mixed, the gel was washed, and dried at 100 ° C for 2 h to obtain a mixture of XNBR containing nanofibers. The dried gel is kneaded on an open mill. The components and their proportions in the compound are: 100 parts of rubber, 1 part of anti-aging agent 4010NA, 1 part of anti-aging agent RD, 1 part of vulcanizing agent BIPB, 3 parts of vulcanizing agent DTBP, Kevlar nanofiber : 5 servings. Other conditions are the same as example 1. The tensile strength of the XNBR composite material containing 5 parts of Kevlar nanofibers was 13.12MPa, the elongation at break was 128%, the 100% modulus was 12.17MPa, the 300% modulus was 13.01MPa, and the tear strength was 30.61 KN / m.

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Abstract

The invention discloses a high-performance rubber composite material containing Kevlar nano-fibers and a preparation method thereof. Kevlar nano-fiber aqueous dispersion is prepared by hydrothermal treatment of Kevlar fibers under a certain condition, then the dispersion is mixed with XNBR latex, the mixture is added into a flocculating agent, an XNBR mixture containing Kevlar nano-fibers is prepared by a co-agglomeration method, and an XNBR composite material with high mechanical properties and containing the Kevlar nano-fibers can be obtained through vulcanization processing by adding a vulcanizing agent. According to the high-performance rubber composite material containing Kevlar nano-fibers, provided by the invention, the Kevlar nano-fibers are added into rubber and well dispersed ina rubber matrix through a latex blending method, moreover, the mechanical properties of the rubber are improved. Therefore, the application range of XNBR rubber is expanded.

Description

technical field [0001] The invention belongs to the technical field of preparation of rubber polymer composite materials, in particular to a rubber composite material with high mechanical properties containing Kevlar nanofibers and a preparation method thereof. Background technique [0002] Aramid fiber (poly-p-phenylene terephthalamide (PPTA)), trade name Kevlar fiber, is a material with ultra-high strength, hardness and thermal stability, used in aerospace and automobile manufacturing industries etc., and its excellent mechanical properties are often used as fillers for reinforcing polymers. The basic repeating unit of Kevlar fiber molecular chain is -[-CO-C 6 h 4 -CONH-C 6 h 4 NH-]-, the amide group is connected at the para position of the benzene ring, and has strong intermolecular interactions (such as: hydrogen bonding between carbonyl and amino groups on different amide groups and π-π between benzene rings Stacking effect), resulting in high crystallinity of PPTA...

Claims

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Application Information

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IPC IPC(8): C08L13/00C08L77/10
CPCC08L13/00C08L2205/16C08L77/10
Inventor 贾红兵薛晓东张旭敏尹清章婉琪姜宽涂晶
Owner NANJING UNIV OF SCI & TECH
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