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A Modified Nanotube/Oil-Containing Cast Nylon Composite Material

A composite material, casting nylon technology, applied in the field of polymer composite materials, can solve the problems of material mechanical properties decline, poor self-lubrication, friction resistance, poor wear resistance, etc., to achieve improved performance, tensile strength and elongation at break. The effect of increased length and improved wear performance

Active Publication Date: 2020-05-12
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current ordinary cast nylon also has disadvantages such as poor low-temperature toughness, poor friction resistance, poor wear resistance, and poor self-lubricating properties.
In actual use, friction performance is particularly important. In order to improve the friction resistance of cast nylon materials, it is generally used to add lubricating grease to make oil-containing cast nylon. However, the addition of grease will lead to a decrease in the mechanical properties of the material, which makes the mold The wider application of nylon materials is limited, while high-end products mainly rely on imports
In order to improve the mechanical properties of cast nylon, there is also a method of adding nanoparticles / tubes to cast nylon, but the addition of nanoparticles / tubes improves the mechanical strength to a certain extent, but the friction performance cannot be improved. promote

Method used

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  • A Modified Nanotube/Oil-Containing Cast Nylon Composite Material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Weigh 1 g of titanium dioxide nanotubes and add them to 150 ml of 1 mol / L hydrochloric acid solution, stir ultrasonically for 1.0 hour, then wash with distilled water until neutral, and obtain impurity-removed and activated nanotubes after suction filtration.

[0025] (2) Add 1g of titanium dioxide nanotubes obtained in the previous step to 100ml of ethanol, then add 0.1g of γ-aminopropyltriethoxysilane (KH-550) silane coupling agent and react at 75°C for 6 hours, wash and centrifuge and drying to obtain modified titanium dioxide nanotubes.

[0026] (3) Add 1 g of modified titanium dioxide nanotubes to 7 g of base oil, ultrasonically disperse in an environment of 130° C. for 5 hours, and obtain a modifier formed of modified titanium dioxide nanotubes and base oil after ultrasonication is completed.

[0027] (4) Heat 100 g of caprolactam to 110° C. to melt, then raise the temperature to 140° C., add 1 g of modifier, and react under reduced pressure for 15 minutes (va...

Embodiment 2

[0042] Other steps and embodiment 1, difference is that the 0.1g gamma-aminopropyltriethoxysilane (KH-550) silane coupling agent in the step (2) is changed into 0.2g vinyltriethoxysilane ( KH-151) silane coupling agent. Its performance test result is close to Example 1.

Embodiment 3

[0044] Other steps are the same as in Example 1, except that the 7g base oil in step (3) is replaced with 4g methyl silicone oil, and the temperature of adding modifier is changed from 140°C to 135°C. Its performance test result is close to Example 1.

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Abstract

The invention discloses a modified nanotube / oily cast nylon composite material. The modified nanotube / oily cast nylon composite material is prepared through a following preparation method. The preparation method comprises the following steps: (1) adding a nanotube into an acid solution, and ultrasonically stirring, thus obtaining an activated nanotube; (2) adding the activated nanotube into ethanol, then adding a silane coupling agent, and reacting for 1.0 to 8.0 hours, thus obtaining a modified nanotube; (3) adding the modified nanotube into lubricating grease, thus obtaining a modifier, wherein 0.1 to 8.0 g of the lubricating grease is added in the modified nanotube per 1 g; (4) heating and melting hexanolactam, adding the modifier, and then adding a catalyst, thus obtaining the cast nylon composite material. According to the cast nylon composite material obtained by the invention, the tensile strength and the elongation at break are remarkably increased.

Description

technical field [0001] The invention belongs to the technical field of polymer composite materials, and uses modified nanotubes and lubricating grease to jointly modify cast nylon composite materials. [0002] technical background [0003] Cast nylon, also known as monomer cast nylon (MC nylon), uses a basic catalyst and a co-catalyst to cast the hot-melt caprolactam monomer into the preheated mold, and the hot-melt caprolactam monomer is rapidly produced in the mold. Anionic in-situ polymerization reaction, after cooling and demoulding, cast nylon products are obtained. Cast nylon products have the advantages of simple process, large molecular weight and uniform distribution, wide service temperature and good mechanical properties. However, the current ordinary cast nylon also has disadvantages such as poor low-temperature toughness, poor friction resistance, poor wear resistance, and poor self-lubricating properties. In actual use, friction performance is particularly imp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L77/02C08L91/00C08L83/04C08K9/02C08K9/06C08K7/00C08K3/22C08K3/34C08G69/16
CPCC08G69/16C08K2003/2241C08K2201/011C08L77/02C08L91/00C08K9/02C08K9/06C08K7/00C08K3/22C08L83/04C08K3/34
Inventor 张倩王凡王月欣
Owner HEBEI UNIV OF TECH
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