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Process for melting aramid/aramid fiber

A technology of aramid and fiber, applied in the field of shaped products, which can solve the problems of increased material expenditure and high weight of formed objects

Inactive Publication Date: 2018-11-09
普罗奥尼克股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general, linking aramid units can be considered problematic, so that aramid fibers are often combined with other support materials and connecting materials, which leads to increased material expenditure and higher weight of the formed body, This leads to other disadvantages such as in aircraft construction

Method used

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  • Process for melting aramid/aramid fiber
  • Process for melting aramid/aramid fiber
  • Process for melting aramid/aramid fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0210] under magnetic stirring 1780 denier fibers were dissolved in 1-ethyl-3-methylimidazolium acetate at 80°C for 3 hours. Add 5% by weight of The fibers gave a clear viscous solution. When adding 10% by weight of When the fibers were mixed, initially not all of the fibers were completely dissolved, but heating to 100°C again provided a clear viscous solution. At 100°C, additionally add Fibers increased the concentration to a clear solution of 20% by weight, which formed a highly viscous solution.

[0211] To 10 g of 1-ethyl-3-methylimidazolium acetate (CAS 143314-17-4; content HPLC > 98% by weight, water T-240 220 denier fibers and magnetically stirred overnight at 80°C in a sealed round bottom flask. The aramid copolymer fibers were completely dissolved and a homogeneous mixture was obtained. After cooling and adding about 50% by weight of water as anti-solvent, the fibers reprecipitated and "wrapped" at least partially around the glass capillary by stirring wit...

Embodiment 2

[0213] Will T-240 220 denier fiber (para-aramid copolymer) and Each (3 mg) of the 1780 denier fiber (meta-aramid) was treated with each (1 g) of the following dry (<1 wt. % water) ionic liquid or salt and stirred at 100° C. for three hours . Observation and measurement of the solvation properties of the aramid fibers yielded results shown in Table 3.

[0214] table 3

[0215]

[0216]

[0217] Aramid fibers treated with ionic liquids 1-15 were completely dissolved and had the potential to re-precipitate by adding water as anti-solvent. Ionic Liquids 16 to 19 showed strong swelling activity, but both studied fiber types only gelled or partially but not completely dissolved; Ionic Liquids 20 to 22 only partially dissolved the surface of the aramid copolymer . In addition, with regard to ionic liquids 16 to 22, the swelling process can be reversed by adding water. All other ionic liquids (24 to 36) left no change in the fibers. Comparative Examples 37 to 40 represe...

Embodiment 3

[0222] Will Each (3 mg) of K29 fibers (para-aramid) was treated with each (1 g) of the following ionic liquids and stirred at 100° C. for 3 hours. The solubility properties of aramid fibers in different ionic liquids were observed and measured, and the results are shown in Table 4.

[0223] Table 4

[0224]

[0225]

[0226] In all other ionic liquids and salts described in Example 2, K29 is completely insoluble. A comparison between Example 2 and Example 3 shows that the para-aramid fiber behaves differently from meta-aramid fibers or para-aramid copolymer It can be postulated that in the interaction of two para-aramid polymers, the hydrogen bonds are particularly strong, on the one hand due to the strongly polarized N–H bond in the para position, and on the other hand due to the optimal geometric arrangement. Only those ionic liquids with strongly coordinating anions are suitable for dissolving para-aramid fibers. When the halide fluoride was used as anion ...

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Abstract

A method for melting aramid fibers, wherein a) at least one region of the aramid fibers is treated with an ionic liquid to partially dissolve the aramid fibers, b) the aramid fibers are partially dissolved by The areas of the aramid are brought into contact with each other, preferably while applying pressure to the contact areas, followed by c) recondensing the partially dissolved areas of the aramid.

Description

technical field [0001] The present invention relates to a method for welding aramid / aramid fibers, a welded aramid fiber and a shaped article made of the welded aramid fiber. Background technique [0002] According to the US Federal Trade Commission and DIN 60001, aromatic polyamides (aromatic polyamides, polyaramides) are long-chain synthetic polyamides in which at least 85% of the amide groups are directly attached to two aromatic rings. Two aramid polymers can be hydrogen bonded and have structural features such as: [0003] para-aramid [0004] [0005] Meta-aramid: [0006] [0007] Aramids are mainly produced as fibers and to a lesser extent as foils. Aramid fiber is a golden yellow organic synthetic fiber. The fiber was developed by Stephanie Kwolek of DuPont in 1965 and sold under the trade name Enter the mature stage of the market. Aramid fibers are characterized by very high strength, high impact resistance, high elongation at break, good vibration abs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M13/00D06M23/10D06B9/00C08L77/10C08J5/04C08J3/11C08J5/12D06M101/36
CPCC08J3/11C08J5/046C08J5/122C08L77/10D06B9/00D06M13/00D06M23/10C08G69/32C08J2377/10C08J11/08C08L2205/16C08L2205/025D06M2101/36C08J3/09C08J5/00D01F6/60D01F6/605D06M13/292D06M13/463D06M13/473D10B2331/021
Inventor 罗兰·卡尔布布格哈特·施密特
Owner 普罗奥尼克股份有限公司
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