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Super toughness MC nylon material and preparation method thereof

A nylon and super-tough technology is applied in the field of super-tough MC nylon material and its preparation. dispersive effect

Inactive Publication Date: 2017-07-14
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unmodified MC nylon has poor low-temperature toughness in practical applications, and it is difficult to be widely used in large-scale aerospace, electronics, transportation, auto parts and other fields. Therefore, research on high-toughness MC nylon products is the main research direction at present.
[0003] At present, there have been a large number of reports on toughening and modifying MC nylon. Chinese patent CN103509336A discloses MC nylon composite material and its preparation method. PA fibrous filler is used to modify MC nylon, and the toughness has been improved to a certain extent; Chinese patent application No. 200710173608.4 discloses an in-situ casting nylon carbon nanotube nanocomposite material and its preparation method. The polymerization reaction between carbon nanotubes and caprolactam greatly improves the strength of the material, but the cost of the material is greatly increased and the toughness is not high. There is a big improvement

Method used

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  • Super toughness MC nylon material and preparation method thereof
  • Super toughness MC nylon material and preparation method thereof
  • Super toughness MC nylon material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 100 parts of caprolactam into the Erlenmeyer flask, place it in an oil bath and raise the temperature to 90°C to heat the caprolactam to melt. Raise the temperature of the system to 120°C, vacuumize and dehydrate under the condition of magnetic stirring, release the vacuum when large bubbles appear; continue to stir and add 0.35 parts of sodium hydroxide to vacuumize, while raising the temperature of the system to 140°C, continue to stir and dehydrate, large bubbles appear, and continue to pump Vacuum for 10 minutes, release the vacuum; continue to stir, add 0.75 parts of toluene diisocyanate to obtain a prepolymerization system, cast it into a mold preheated in an oven at 180 ° C, continue heating for 2 hours, cool to room temperature, and obtain MC nylon Materials and test results are shown in Table 1.

Embodiment 2

[0021] Add 100 parts of caprolactam into the Erlenmeyer flask, place it in an oil bath and heat up to 90°C to heat the caprolactam to melt. After the caprolactam is melted, add 0.05 parts of modified nano-silica, and stir to make it completely dissolve in the caprolactam melt. . Raise the temperature of the system to 120°C, vacuumize and dehydrate under the condition of magnetic stirring, release the vacuum when large bubbles appear; continue to stir and add 0.35 parts of sodium hydroxide to vacuumize, while raising the temperature of the system to 140°C, continue to stir and dehydrate, large bubbles appear, and continue to pump Vacuum for 10 minutes, release the vacuum; continue to stir, add 0.75 parts of toluene diisocyanate to obtain a prepolymerization system, cast it into a mold preheated in an oven at 180 ° C, continue heating for 2 hours, cool to room temperature, and obtain MC nylon Materials and test results are shown in Table 1.

Embodiment 3

[0023] Add 100 parts of caprolactam into the Erlenmeyer flask, place it in an oil bath and heat up to 90°C to heat the caprolactam to melt. After the caprolactam is melted, add 0.1 part of modified nano-silica, stir to make it completely dissolve in the caprolactam melt . Raise the temperature of the system to 120°C, vacuumize and dehydrate under the condition of magnetic stirring, release the vacuum when large bubbles appear; continue to stir and add 0.35 parts of sodium hydroxide to vacuumize, while raising the temperature of the system to 140°C, continue to stir and dehydrate, large bubbles appear, and continue to pump Vacuum for 10 minutes, release the vacuum; continue to stir, add 0.75 parts of toluene diisocyanate to obtain a prepolymerization system, cast it into a mold preheated in an oven at 180 ° C, continue heating for 2 hours, cool to room temperature, and obtain MC nylon Materials and test results are shown in Table 1.

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Abstract

The invention provides a super toughness MC nylon material, which comprises the following components in parts by weight: 100 parts of caprolactam, 0.1 to 0.35 part of alkali catalyst, 0.75 to 1 part of activator, and 0 to 0.15 part of modified nano silicon dioxide. The adopted modified nano silicon dioxide has been processed specially. The terminals of used amino-terminated dendrimers comprise multiple amino groups, the center of the dendrimers is hydrolysable alkoxy silyl ester groups; under certain conditions, dendrimers are evenly distributed on the surface of silicon dioxide particles and bonded with the silicon dioxide particles through covalent bonds; silicon dioxide, which is functionalized by dendrimers, has high dispersibility and high surface energy; silicon dioxide particles are evenly dispersed in caprolactam, the synergetic toughening effect of island effect and interpenetrating network structure is realized, and the mechanical properties of the material are greatly improved.

Description

technical field [0001] The invention relates to a super-tough MC nylon material and a preparation method thereof. Background technique [0002] Monomer cast nylon, also known as MC nylon, is an engineering plastic prepared by caprolactam through anionic polymerization technology. Its mechanical properties are good, and its strength is 1.5 times that of ordinary nylon. Grinding, anti-corrosion, insulation and other characteristics, so it is mainly used to replace metal to make friction parts such as bearings, bearing bushes, gears and so on. Unmodified MC nylon has poor low-temperature toughness in practical applications, and it is difficult to be widely used in large-scale aerospace, electronics, transportation, auto parts and other fields. Therefore, research on high-toughness MC nylon products is the main research direction at present. [0003] At present, there have been a large number of reports on toughening and modifying MC nylon. Chinese patent CN103509336A discloses...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/16C08G69/14C08K9/04C08K3/36
CPCC08G69/16C08G69/14C08K3/36C08K9/08C08K2201/011
Inventor 蔡子青包海峰王蕾胡睿青
Owner WUHAN TEXTILE UNIV
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