Olefin copolymer anti-corrosion

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Olefin copolymer anti-corrosion

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Introduction to corrosion prevention of olefin copolymers

1. Polyethylene PE anti-corrosion with steel lined plastic

Polyethylene English name: polyethylene， PE, abbreviated as PE, is a thermoplastic resin made by polymerizing ethylene. In industry, it also includes copolymers of ethylene with small amounts of alpha olefins. Polyethylene is odorless, non-toxic, and feels like wax. It has excellent low-temperature resistance (with a minimum operating temperature of -70~-100 ℃), good chemical stability, and can withstand most acid and alkali corrosion (not resistant to acids with oxidizing properties). It is insoluble in general solvents at room temperature, has low water absorption, and excellent electrical insulation performance.

Polyethylene is a typical thermoplastic, which is a odorless, tasteless, non-toxic flammable white powder. The PE resin processed by molding is a wax like granular material that has been extruded and granulated, with a milky white appearance. Its molecular weight is within the range of 10000 to 10000. Molecular weight exceeding 10. Wan is ultra-high molecular weight polyethylene f UHMWPE3. The higher the molecular weight, the better its physical and mechanical properties, and the closer it is to the required level of engineering materials. But the higher the molecular weight, the greater the difficulty of processing it. Polyethylene has a melting point of 10-130C and excellent low-temperature resistance. Good mechanical properties can still be maintained at 60 ℃, but the operating temperature is between 80-110 ℃.

Polyethylene has good chemical stability and can withstand dilute nitric acid, dilute sulfuric acid, and any concentration of hydrochloric acid, hydrofluoric acid, phosphoric acid, formic acid, acetic acid, ammonia water, amines, hydrogen peroxide, sodium hydroxide, potassium hydroxide and other solutions at room temperature. But it is not resistant to strong oxidation corrosion, such as a mixture of fuming sulfuric acid, concentrated nitric acid, chromic acid, and sulfuric acid. At room temperature, the above solvents will slowly corrode polyethylene, while at 90-100 ℃, concentrated sulfuric acid and concentrated nitric acid will quickly corrode polyethylene, causing it to break down or decompose.

Polyethylene will undergo aging, discoloration, cracking, brittleness or pulverization under the action of atmosphere, sunlight and oxygen, losing its mechanical properties. At the molding processing temperature, the melt adhesion may also decrease due to oxidation, resulting in discoloration and stripe formation. Therefore, attention should be paid during molding processing, use, or material selection. Because polyethylene has the above characteristics and is easy to process and shape, the recycling of polyethylene has profound value.

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2. Steel lined plasticPolyolefin PO anti-corrosion

Usually refers to polymers of ethylene, propylene, or higher olefins. The English abbreviation is PO. Among them, polyethylene and polypropylene are the most important.Its anti-corrosion performance is similar to polyethylene, but the applicable temperature is slightly different.

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3. Steel lined plasticPolypropylene PP anti-corrosion

Polypropylene, English name: Polypropylene（PP)， Japanese name: Polipro ピレン, molecular formula: (C3H6)n。 CAS login number: 9003-07-0, is a thermoplastic resin made by polymerizing propylene. According to the arrangement of methyl groups, it can be divided into three types: isotropic polypropylene, atatic polypropylene, and syndiotactic polypropylene.

physical property：Polypropylene is a non-toxic, odorless, and tasteless milky white highly crystalline polymer with a density of only 0.90-0.91g/rm, making it one of the lightest varieties of plastics currently available. It is particularly stable to water, with a water absorption rate of only 0.01% and a molecular weight of approximately 80000 to 150000. Good formability, but due to high shrinkage rate (1%~2.5%) Thick walled products are prone to dents, and for some parts with high dimensional accuracy, it is difficult to meet the requirements. The surface of the product has good gloss and is easy to color.

Thermal performance：Polypropylene has good heat resistance, and products can be disinfected and sterilized at temperatures above 100 ℃ without deformation at 150 ℃ without external force. The brittleness temperature is -35 ℃, and brittleness occurs below -35 ℃. Its cold resistance is not as good as polyethylene. There is a reported value of 18qC for the glass transition temperature of polypropylene, OqC, At 5 ℃, this is also due to the different proportions of crystalline and amorphous phases in the samples used, resulting in different chain lengths of the amorphous parts in the molecular chain. The melting temperature of polypropylene is about 40-50% higher than that of polyethylene, about 164-170 ℃, and 100% isotactic polypropylene.

chemical stability：Polypropylene has good chemical stability, except for being corroded by concentrated sulfuric acid and concentrated nitric acid, it is relatively stable to various other chemical reagents; However, low-molecular-weight fatty hydrocarbons, aromatic hydrocarbons, and chlorinated hydrocarbons can soften and swell polypropylene, and its chemical stability also increases with the increase of crystallinity. Therefore, polypropylene is suitable for making various chemical pipelines and fittings, and has good anti-corrosion effect.

Electrical performance：It has a high dielectric constant and can be used to make heated electrical insulation products as the temperature increases. Its breakdown voltage is also very high, making it suitable for use as electrical components, etc. Good resistance to voltage and arc, but high static electricity and easy aging when in contact with copper.

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Example of olefin copolymer anti-corrosion selection