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What Are The Specific Requirements For Automotive Interiors For PP Materials?

Jun. 21. 2019

As a PP Granules Supplier, let's talk about the requirements for PP materials for interior parts. In order to create a more comfortable and beautiful car interior environment, this paper puts forward some other requirements for PP as interior material.

1. Requirements for scratch resistance

The raw material PP of automotive interior parts is relatively low in hardness, so some parts are easily scratched, scratched or kicked during the user's use. For a long time, the surface of the parts is obviously white, which is very ugly. Therefore PP materials must have scratch resistance.

2. Resistance to white marks

When the decorative parts of PP Modified Material are subjected to external forces such as bending or impact during assembly, whitening often occurs, and white marks will further expand over time, affecting the aesthetics of the interior. This is what everyone usually calls stress whitening. In order to avoid whitening of the stress, the PP material must also have the property of resisting whitening.

3. Heat aging resistance

Polypropylene materials are easily oxidized by oxygen in the air due to their structure, especially when exposed to light and heat, which accelerates aging and destroys their physical and mechanical properties. Affects the life of the part. Therefore, the PP material must have the property of heat-resistant oxygen aging. As an interior part, it must be at least 150 °C for 400 hours without chalking. The experiment can use the entire part, or the part can be cut into splines and then in the dry box.

PP Modified Material

4. Dissipation performance

People are increasingly demanding air quality for automotive interiors, and the country is about to introduce relevant standards for automotive interior air quality requirements. Therefore, in order to ensure a good car interior environment, as an interior part, the four requirements of the emission performance must be met without exception. The emission characteristics of the interior parts include odor test, formaldehyde content determination, condensation composition, and total carbon emission.

5. Requirements for light aging resistance

Open the door and it can be directly or indirectly exposed to sunlight for parts that the user can see directly. In order to avoid defects such as discoloration and deformation due to sunlight, the raw material itself must have photoaging resistance.

6. Anti-stick properties

With the wide application of PP Modified Material in automotive interiors, new problems have also been exposed. In the atmospheric exposure, precipitates are formed on the surface of polypropylene parts, and at the same time, stickiness occurs, and the gloss of the surface of the parts also occurs. Change. For this reason, PP materials must have anti-stick properties. Simple thermal aging, sunlight simulation, and normal interior photoaging conditions are not able to reproduce tackiness and must be verified under more appropriate photoaging conditions.

7. Good antistatic performance

 You can observe that after using the car for a period of time, the surface of some parts tends to absorb dust. After a long time, the dust is not removed, and it is getting dirty and it is difficult to wipe it clean. This is caused by static electricity. Since PP Granules is a non-polar polymer, it has good electrical insulation and is not affected by humidity, so it is easy to generate static electricity. The problem above will appear after a long time. Severe static electricity can also cause shocks and even sparks. Therefore, PP materials should also have antistatic properties. The antistatic property can be measured by an index such as surface resistance.