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Polyamide composition and manufacturing method for manufacturing sliding and rolling parts by using same

A polyamide composition, polyamide technology, applied in the field of polyamide composition and the manufacture of sliding and rolling parts made of it, can solve the loss of material ductility and toughness, large surface roughness of parts, increase of dynamic friction coefficient, etc. problem, to achieve the effect of excellent appearance and low Ra value

Pending Publication Date: 2022-07-12
浙江美亚特精密机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] It should be noted that although reinforcing fibers significantly improve the mechanical properties of polyamide 66 composites, this is also accompanied by the loss of material ductility and toughness, which makes the gears made of this material appear tooth pitch or Risk of tooth root fracture
In addition, from the existing literature and industrial practice, the fiber filling content of reinforced polyamide 66 materials used to manufacture gears and other parts does not exceed 50%, although higher glass fiber content brings stronger material properties, It can be adapted to higher loads, but it is difficult for the manufacture of composite materials. The addition of too high reinforcing fillers leads to poor dispersion of fillers. The parts obtained by injection molding of this material have a large surface roughness and a significant coefficient of dynamic friction. increased, which may cause extreme harshness, and the amount of wear has not decreased due to the increase in reinforcing filler

Method used

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  • Polyamide composition and manufacturing method for manufacturing sliding and rolling parts by using same
  • Polyamide composition and manufacturing method for manufacturing sliding and rolling parts by using same

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preparation example Construction

[0034] sample preparation

[0035] The specific embodiment of the present invention is described in detail by using the comparison between the technical solution of the invention and the existing technical solution. The compositions of Inventive Examples 1-8 and Comparative Examples 1-7 were prepared by mixing together the ingredients listed below in relative amounts (all expressed in weight fractions). The components A1-A3 in Comparative Examples 1-3 are polyamide 66 resins prepared by the technical solution of the present invention, and the components A in Comparative Examples 4-7 are A3-A5 purchased from the existing market.

[0036] Component A:

Embodiment 1

[0037] A1: PA66-1.52, relative viscosity 1.52, terminal carboxyl group content 86mmol / kg, terminal amino group content 89mmol / kg, see Example 1 for details;

Embodiment 2

[0038] A2: PA66-1.66, relative viscosity 1.66, terminal carboxyl group content 80mmol / kg, terminal amino group content 74mmol / kg, see Example 2 for details;

[0039] A3: PA66, brand EPR22, relative viscosity 2.2, terminal carboxyl group content 72mmol / kg, terminal amino group content 48mmol / kg, purchased from the existing market;

[0040] A4: PA66, grade EPR27, relative viscosity 2.7, purchased from the existing market;

[0041] A5: PA66, grade EPR32, relative viscosity 3.2, purchased from the existing market;

[0042] Component B:

[0043] Glass fiber: brand ECS301HP, diameter 10um, length 4.5mm, purchased from Chongqing International Composite Materials Co., Ltd.

[0044] Component C:

[0045] C1: Antioxidant N445, purchased from Lanxess Special Chemicals, Germany;

[0046] C2: lubricant, stearate, brand TR044, purchased from Structol, Germany.

[0047] Example 1:

[0048] To 0.05m equipped with stirring equipment, partial condenser, condenser, thermometer, dropping fu...

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Abstract

The invention discloses a polyamide composition and a manufacturing method for manufacturing sliding and rolling parts by using the polyamide composition, the polyamide composition comprises the following components in percentage by weight: 29-50% of polyamide 66 resin, 50-70% of reinforced fiber and 0-1% of extrusion additive, the relative viscosity of the polyamide 66 resin measured in a 96% concentrated sulfuric acid solvent is 1.5-2.0, the content ratio of amino-terminated groups to carboxyl-terminated groups of the polyamide 66 resin is 0.85: 1-1.15: 1, and the polyamide 66 resin contains 100-200 ppm of phosphorus-containing compounds in terms of phosphorus atom content; not higher than 3% of impregnating compound exists on the surface of the reinforced fiber. A part blank is obtained by injection molding of a polyamide composition prepared by blending granulation through a parallel co-rotating twin-screw extruder, and is thermally stored in an inert gas circulation cavity at the temperature of 190-240 DEG C for no less than 12 hours. The appearance is excellent, and the roughness Ra value is low.

Description

technical field [0001] The invention relates to the fields of polymer materials and engineering, in particular to a polyamide composition and a manufacturing method for making sliding and rolling parts with the same. Background technique [0002] Gear transmission is one of the most widely used mechanical transmissions, which can transmit motion and power between any two axes in space, and change the way of motion. Gear transmission also has the characteristics of stable transmission, precision, high efficiency, compact structure and reliable operation. Compared with metal gears, plastic gears have the characteristics of light weight, small inertia, corrosion resistance, wear resistance and low noise, as well as good insulation, and are widely used in automobiles, low-voltage electrical appliances and other fields. Based on the plastic injection molding process, plastic gears can also achieve complex geometries and coloration. At the same time, under the trend of "replacin...

Claims

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Application Information

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IPC IPC(8): C08L77/06C08K7/14C08K9/06
CPCC08K7/14C08K9/06C08L77/06Y02T10/86
Inventor 周友华周友锋王世君
Owner 浙江美亚特精密机械有限公司
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