Method for testing chlorine resistance of automobile part made of polyamide material

A technology of auto parts and test methods, which is applied in the direction of analysis materials, weather resistance/light resistance/corrosion resistance, measuring devices, etc. There are no problems such as quantitative evaluation of polyamide material properties, and the effects of subjective evaluation results, improved experimental accuracy, and reduced experimental operation time

Active Publication Date: 2021-11-30
DONGFENG MOTOR GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, this patent has the following disadvantages: the concentration of chloride salt is single (50% calcium chloride solution; the polyamide material has a single action time (24h) in the chloride salt solution; the experimental methods are all test methods under static loads, and no Test method: only subjective evaluation of the effect of chloride salts on the surface of polyamide materials, the evaluation system is greatly affected by the differences of evaluators, and there is no quantitative evaluation of the performance of polyamide materials
[0007] Yet this application has following shortcoming: chlorine salt concentration is single (45% calcium chloride solution); Subjective evaluation of the effect of salt on the surface of polyamide materials, the evaluation system is greatly affected by the differences of evaluators, and there is no quantitative evaluation of the performance of polyamide materials

Method used

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  • Method for testing chlorine resistance of automobile part made of polyamide material
  • Method for testing chlorine resistance of automobile part made of polyamide material
  • Method for testing chlorine resistance of automobile part made of polyamide material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] This embodiment discloses a test method for the chlorine resistance performance of a lower guard plate part of an automobile chassis, wherein the raw material components of the part include PA6 with a molecular weight of 20,000-30,000. The specific test steps are as follows:

[0054] 1) Cut 5 rulers as 120×20×3mm splines perpendicular to the injection flow direction of the parts, mark points A and B, and place them in a drying dish at room temperature for later use.

[0055] 2) Prepare a calcium chloride solution with a mass concentration of 5% and introduce it into the salt spray tank of the salt spray box.

[0056] 3) Take out a spline from the drying dish, fix it with a clamp, record the scale value corresponding to the level of point B at this moment, and then put the clamp device into the salt spray box.

[0057] 4) Select the 10N load pulse indenter, and adjust the pulse indenter to be directly above point A of the spline and infinitely close.

[0058] 5) Set th...

Embodiment 2

[0066] This embodiment discloses a test method for the chlorine resistance performance of automobile engine cover parts, wherein the raw material components of the parts include PA6 with a molecular weight of 18,000-20,000, modified glass fibers, salt-resistant acrylic copolymer resins, antioxidants, anti-oxidants, etc. Abrasives etc. Among them, PA6 accounts for about 60%, modified glass fiber accounts for 30%, salt-resistant acrylic copolymer resin accounts for 9%, and the rest are additives such as antioxidants and wear-resistant agents. The modified product of zirconium and silane coupling agent, the molecular weight of the salt-resistant acrylic copolymer resin is about 3000.

[0067] The specific test steps are the same as the above-mentioned Example 1; and the specific evaluation grades are shown in the following table.

[0068] Table 3 Evaluation list of chlorine resistance performance of automobile hood parts

[0069]

[0070]

Embodiment 3

[0072] This embodiment discloses a test method for the chlorine resistance performance of an automobile water tank cover part, wherein the raw material components of the part include PA66 with a molecular weight of 20,000-30,000, modified glass fiber, salt-resistant acrylic copolymer resin and antioxidant, anti-oxidant Abrasives etc. Among them, PA66 accounts for about 70%, modified glass fiber accounts for 15%, salt-resistant acrylic copolymer resin accounts for 10%, and the rest are additives such as antioxidants and wear-resistant agents. The modified product of zirconium and silane coupling agent, the molecular weight of the salt-resistant acrylic copolymer resin is about 3000.

[0073] The specific test steps are the same as the above-mentioned Example 1; and the specific evaluation grades are shown in Table 4 below;

[0074] Table 4 Evaluation list of chlorine resistance performance of automobile hood parts

[0075]

[0076]

[0077] From the above-mentioned Exam...

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Abstract

The invention discloses a method for testing chlorine resistance of an automobile part made of a polyamide material, and belongs to the technical field of performance testing of high polymer materials. The testing method comprises the steps that n cuboid splines are cut out from the surface of the automobile part made of the polyamide material, one end, in the length direction, of each spline is marked, the midpoint position of the tail end of each spline is marked as B, and the center, located on the same side of the midpoint of the tail end and having a certain distance from the midpoint of the tail end, of each spline is marked as A; one unmarked end of the sample strip in the step 1) is fixed on a clamping part of a clamp, the other marked end of the sample strip is positioned below a pulse pressure head, and the pulse pressure head is over against a point A of the sample strip; then, the influence of the chlorine salt on the mechanical property of the automobile part made of the polyamide material is judged by measuring the deformation quantity of the sample strip under different salt mist concentrations, different load acting forces and different times. The testing method designed by the invention not only is simple in sample preparation, but also is high in objective accuracy of an evaluation system.

Description

technical field [0001] The invention relates to a simulation test for the chlorine resistance performance of polyamide materials, belongs to the technical field of polymer material performance testing, and in particular relates to a chlorine resistance test method for polyamide material auto parts. Background technique [0002] Polyamide materials are widely used in the automotive industry, especially in the heat dissipation system and cooling system of the engine and the chassis guards and other components. The working conditions of these parts are relatively harsh, and generally need to be used for a long time in the environment of -40 ~ 135 ° C, so there are higher requirements for the performance of the material. In northern my country and Europe and the United States, in severe cold weather for a long time, snow-melting agents are often thrown on the roads to remove snow. Commonly used snow-melting agents are mainly chlorine salts such as sodium chloride and calcium chl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00
CPCG01N17/00
Inventor 李亦琛高祥达熊芬李明桓
Owner DONGFENG MOTOR GRP
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