Preparation method of cast nylon composite material with high friction-reducing and anti-wear surface layer

A cast nylon, anti-friction and anti-wear technology, which is applied in the field of preparation of cast nylon composite materials, can solve the problems of decreased tensile strength and increased brittleness of the filling system, and achieve the effect of enhancing self-lubrication

Inactive Publication Date: 2013-12-18
HUAIYIN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, it is challenging to improve or maintain the overall mechanical strength and toughness while effectively improving the wear resistance of cast nylon friction surfaces.
Usually, the friction reducer or solid anti-wear substance as the dispersed phase is divided into the continuous phase of the matrix resin, and the area of ​​the matrix resin on the stressed section must be smaller than that of the pure resin material, so the tensile strength of the filling system The strength generally decreases; when the dispersed phase filler is a rigid particle, because it cannot be deformed under stress, it cannot terminate cracks or produce silver crazes to absorb impact energy, which often leads to an increase in the brittleness of the filling system; moreover, these are harmful to the overall material The detrimental effects of mechanical strength and toughness increase with increasing filler content

Method used

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  • Preparation method of cast nylon composite material with high friction-reducing and anti-wear surface layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: prepare composite material according to the following specific steps

[0019] (1) Preparation of dispersed colloids: 800g of purified hexamethylphosphoric triamide, 50g of heat-treated ultrafine kaolin and 50g of toluene diisocyanate were accurately measured respectively, placed in a stirring reactor, and protected by dry nitrogen , fully stirred, and reacted at 80°C and normal pressure for 4 hours to obtain a dispersed colloid, cooled the dispersed colloid to normal temperature, and stored it in a desiccator filled with anhydrous calcium chloride for later use;

[0020] (2) Preparation of concentrated reactive material: Put 1000g of caprolactam monomer and 3.0g of sodium hydroxide into a stainless steel active material kettle at the same time, reduce the pressure to 1.33kPa, react at 120°C, distill to remove moisture, and maintain the reduced pressure state for 30min. To obtain the concentrated reactive material containing caprolactam sodium salt, remove ...

Embodiment 2

[0023] Embodiment 2: Prepare composite material according to the following specific steps

[0024] (1) Preparation of dispersed colloid: same as step (1) of Example 1;

[0025] (2) Preparation of concentrated reactive material: put 1000g of caprolactam and 4.5g of sodium hydroxide into a stainless steel active material kettle, reduce the pressure to 1.33kPa, react at 126°C, remove water by distillation, and maintain the reduced pressure state for 30min to obtain sodium caprolactam For the concentrated reactive material of salt, remove the vacuum, pass dry nitrogen to normal pressure, and keep the temperature of the concentrated reactive material at 165°C;

[0026] (3) Preparation of synergistically modified composite materials: put 2000g caprolactam into a stainless steel batching kettle, reduce the pressure to 1.33kPa, distill and remove moisture at 130°C, maintain the reduced pressure state for 20min, release the vacuum, and pass dry nitrogen to normal pressure , then add 2...

Embodiment 3

[0028] Embodiment 3: prepare composite material according to the following specific steps

[0029] (1) Preparation of dispersed colloid: same as step (1) of Example 1;

[0030] (2) Preparation of concentrated reactive material: put 1000g of caprolactam and 6.0g of sodium hydroxide into a stainless steel active material kettle, reduce the pressure to 1.33kPa, react at 135°C, remove water by distillation, and maintain the reduced pressure state for 30min to obtain caprolactam For the concentrated reactive material of sodium salt, the vacuum is released, dry nitrogen is introduced to normal pressure, and the temperature of the concentrated reactive material is kept at 170°C;

[0031] (3) Preparation of synergistically modified composite materials: Put 2000g caprolactam into a stainless steel batching kettle, reduce the pressure to 1.33kPa, distill and remove moisture at 135°C, maintain the reduced pressure state for 20min, release the vacuum, and pass dry nitrogen to normal press...

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Abstract

The invention discloses a preparation method of a cast nylon composite material with a high friction-reducing and anti-wear surface layer. The preparation method comprises the following steps of: preparing dispersive suspensoid by hexamethylphosphoramide, ultra-fine kaolin and toluene diisocynate in proportion; adding dispersive suspensoid and teflon micro powder to a caprolactam melt; initiating caprolactam anionic ring-opening polymerization through a sodium hydroxide-toluene diisocynate catalytic activating system; casting a reaction mass into a preheated and heat-preserved centrifugal rotating die under normal pressure; after the reacting and casting liquid is polymerized, solidified and formed, gradually cooling and demoulding, thus obtaining the cast nylon composite material with the high friction-reducing and anti-wear surface layer. The prepared cast nylon composite material has the characteristics that an inner matrix and an outer surface layer are different in structure and performance, so that the requirements on manufacturing and using various pulleys, idler wheels, rope wheels and guide wheels for a transportation mechanism, a hoisting device and mine equipment can be met.

Description

technical field [0001] The invention relates to a preparation method of a cast nylon composite material with a high friction-reducing and wear-resistant surface layer, in particular to a preparation method of a cast nylon composite material formed by centrifugal casting by utilizing a catalytically activated anion ring-opening polymerization method. Background technique [0002] The cast nylon material developed and manufactured on the basis of catalytically activated anionic ring-opening polymerization has high mechanical strength, toughness and good wear resistance and self-lubricating properties, and has partially replaced non-ferrous metals and Alloy steel is used to manufacture all kinds of wear-resistant mechanical parts, which have the advantages of anti-friction, anti-wear, anti-seizure, easy to run-in, embeddable, corrosion-resistant and non-damaging to wear parts; Under the condition of high load and high speed operation, it is still necessary to provide lubricatin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/18C08G69/20C08K9/04C08K3/34C08K5/5399C08L77/02C08L27/18B29C39/08
Inventor 蒯海伟王玉苏兰朱小红程晓春
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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