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What are the specific aspects of the chemical corrosion resistance of polyester fibers
source：www.kingcharmgroup.com | Release time：2025-12-151. Excellent acid resistance
Polyester fibers are almost unaffected by corrosion in dilute acid and medium concentration acid environments at room temperature, and their molecular chains do not undergo significant hydrolysis or breakage.
Specific manifestations: When immersed in dilute acid solutions such as hydrochloric acid, sulfuric acid, and nitric acid at room temperature, the strength and morphology of the fibers remain basically unchanged; Even high concentrations of organic acids such as acetic acid and citric acid will not cause damage to them.
Applicable scenarios: Can be used to make acid resistant filter cloth for the chemical industry, protective covers for acid conveying pipelines, and packaging materials that come into contact with acidic foods such as vinegar and fruit juice.
Attention: High temperature concentrated acid (such as concentrated sulfuric acid above 90 ℃) can damage the fiber molecular chains, leading to a decrease in strength or even dissolution.
2. Resistant to weak alkali, not resistant to strong alkali
Polyester fibers have good tolerance to weak alkaline solutions (pH ≤ 9), but hydrolysis reactions occur under strong alkaline and high temperature conditions.
Specific manifestations: Contact with weak alkaline substances such as soap water and baking soda solution at room temperature results in stable fiber properties; However, in strong alkaline solutions such as sodium hydroxide (caustic soda) and potassium hydroxide, especially when the temperature exceeds 50 ℃, the ester bonds in the molecular chains will gradually break, and the fibers will experience swelling, strength decrease, weight loss, and other phenomena.
Application and Avoidance: Suitable for making clothes for daily washing and industrial components that come into contact with weak alkaline environments; Long term use under strong alkali and high temperature conditions should be avoided, otherwise it will accelerate fiber aging.
3. Strong salt corrosion resistance
Polyester fibers are resistant to most salt solutions (such as sodium chloride, sodium sulfate, calcium chloride, etc.) and will not undergo chemical changes at room temperature, whether in saturated or dilute salt solutions.
Specific manifestations: Soaking in seawater or industrial salt solution, there is no significant change in fiber strength and morphology, and there will be no salt precipitation, swelling, or corrosion damage.
Applicable scenarios: Can be used to make marine aquaculture cages, fishing boat ropes, seawater filtration materials, as well as shading nets and insect proof nets for agriculture in saline alkali land.
4. Good resistance to organic solvents
Polyester fibers have strong stability in common organic solvents and are not easily dissolved or swollen, with only slight swelling occurring in a few strongly polar organic solvents.
Specific manifestations: When exposed to organic solvents such as ethanol, acetone, gasoline, kerosene, benzene, etc. at room temperature, the fiber strength and morphology remain basically unchanged; Swelling or even partial dissolution may occur only in high-temperature and highly polar solvents such as phenol, o-chlorophenol, and nitrobenzene.
Applicable scenarios: Can be used to make organic solvent filtration materials, protective clothing for chemical workshops, and packaging films that come into contact with inks and coatings.
5. Stable resistance to oxidants and reducing agents
Antioxidant: It has good resistance to common oxidants such as hydrogen peroxide (H2O2) and sodium hypochlorite at low concentrations and room temperature. Therefore, polyester fiber clothing can be cleaned with oxygen-containing bleach without yellowing or brittleness.
Reductive resistant: Stable to reducing agents such as sodium sulfite and sodium thiosulfate, even when in contact with reducing agents during printing and dyeing processes, it will not affect fiber properties.
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