PP Plastic Maintenance: Key Practices

Polypropylene (PP) plastic has become one of the most widely used thermoplastic materials in modern life due to its molecular structure stability and strong hydrophobicity.

Its surface hydrophobicity can reduce 80% of liquid residue, but long-term exposure to complex environments still requires system maintenance. Scientific cleaning must follow three principles: gentle physical contact, neutral chemical reagents, and timely drying.

1. Standardized daily cleaning process specifications
Tool selection: It is recommended to use mild tools such as microfiber cloth, nano sponge, soft-bristled children's toothbrush, etc., and it is strictly forbidden to use steel wool, metal scrapers, hard brushes or metal tweezers. The cleaning medium must use warm water below 40°C, and avoid boiling water or steam.

Operation steps:
① Pretreatment: Use a dry microfiber cloth to remove surface dust;
② Liquid preparation: Mix 5 ml of neutral detergent (PH6.5-7.5) with 1 liter of warm water;
③ Circular wiping: Clean in a counterclockwise spiral direction (reduce the visibility of scratches);
④ Deep treatment: Use a toothbrush to lightly brush the texture at a 45° angle (no more than 20 times in a single area);
⑤ Rinse: Rinse with running water 3 times to ensure no residue;
⑥ Drying: Press with an absorbent cloth to absorb the moisture and place in a cool and ventilated place.

2. Classification and treatment plan for special stains
Oil stain treatment:
Catering oil stains: Apply biological enzyme preparation and let it stand for 15 minutes before wiping;
Industrial oil stains: Dissolve point by point with isopropyl alcohol with a concentration of ≤70%, and degrease with 75% alcohol after treatment.

Pigment pollution response:
Fresh ink: emulsify with makeup remover first, then absorb with cotton swab;
Solidified marker marks: soak with wind oil for 5 minutes and then wipe;
Pigment staining: can be frozen first and then gently peeled off, complex cases require professional ultrasonic cleaning.

Glue stain removal:
Hot melt glue: ice for 15 minutes and then remove with a plastic scraper;
Double-sided tape: soften with WD-40 lubricant and then rotate to remove;
Epoxy resin glue: needs to be sent to a professional organization for low-temperature embrittlement treatment.

3. Advanced maintenance technology and storage management
Maintenance cycle:
Daily: dry cloth dust removal (avoid static adsorption caused by dry wiping);
Weekly: use alcohol-free formula antibacterial spray;
Monthly: apply food-grade silicone oil (amount ≤2ml/㎡);
Quarterly: perform ultraviolet disinfection.

Storage environment control:
Temperature: 15-25℃ (avoid >60℃ environment);
Humidity: 40-60% RH;
Light: avoid direct ultraviolet rays;
Stacking: use buffer materials between layers to prevent stress deformation.

4. High-frequency operation misunderstandings and risk warnings
Warnings for incorrect operation:
Chlorine bleach is prohibited (can cause molecular chain breakage);
Avoid using oven to heat to remove odor (accelerate the loss of antioxidants);
Rubbing with coarse salt to remove dirt is prohibited (produce micron-level scratches).
Chemical corrosion risk:
Contact with concentrated sulfuric acid (>30%), halogenated hydrocarbon solvents, peracetic acid disinfectants, nitric acid/chromic acid and other strong oxidizing acids is strictly prohibited.

5. Professional deep maintenance recommendations
It is recommended to perform professional deep maintenance every 12-18 months, including:
Surface nano-coating treatment (to improve hydrophobicity);
Antistatic treatment (to reduce dust adsorption);
Structural stress detection (to prevent cracking).
When encountering complex pollution that is difficult to handle, it is necessary to contact the material engineer in time to obtain a customized solution.

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