plastic stabilizer

DATE：2022/7/7 9:06:24 / READ： / SOURCE：This station

plastic stabilizer 

During the molding, processing, use and storage of plastics, due to the effects of ripening, light, oxygen and mechanical force, the structure changes and the performance becomes solid. The substances added to avoid or slow down this process are called stabilizers. The effects of stabilizers on ripening, light, oxygen and enclosure can be divided into ripening stabilizers, light stabilizers, antioxidants and antivirus agents. PVDF film production line wwww handern. com
The main kinetic energy of the heat stabilizer is to prevent the degradation or cross-linking of the two materials due to heat during spring processing (at high temperature) or in the process of positional use, so as to prolong their service life. PVC is the most commonly used heat stabilizer, and the heat stabilizer has the following functions. 0 combined with the HC from the system to prevent the autocatalytic effect of PVC. Replace the indeterminate complex atoms on the PC molecular cake, inhibit the dehc reaction, ③ carry out double bond addition reaction with the double bond formed after dehc, and bad co mechanism, so as to reduce the oxidative degradation of colored national defense industry poly decoration structure. According to its chemical structure, heat stabilizers can be divided into basic lead salts, metal soaps, organotin compounds, etc.
Basic lead salt heat stabilizer refers to the lead salt of inorganic or organic acid containing base (PBO). They generally have excellent heat resistance and weather resistance, good electrical insulation, low cost, but poor transparency and toxicity. It is widely used in PVC hard or soft products that are opaque and have no sanitary requirements. Such as tribasic lead sulfate, dibasic lead phosphite, etc. PVDF film production line wwww handern. com
Metal soap heat stabilizers are mainly barium, calcium, magnesium, cadmium, zinc and lead salts of c~cs fatty acids. This kind of heat stabilizer has good stabilizing effect and also acts as a lubricant. Barium soap and cadmium soap are widely used in soft products, while calcium soap and zinc soap are mainly used in soft and non-toxic products. Such as barium stearate, lead stearate, calcium stearate, cadmium stearate, magnesium stearate, etc. Organotin stabilizers have high thermal and light stability, good transparency and processability. Although the price is expensive, the dosage is small, which plays an important role in heat stabilizers. They are commonly used in PVC transparent hard products and products with non-toxic requirements. Such as dibutyltin dilaurate (DBTL), dibutyltin maleate (DBTM), etc. PVDF film production line wwww handern. com
The selection of heat stabilizer should meet the following conditions. ① It has good compatibility with polymers, low volatility, no sublimation, no migration, no frost, and is not easy to extract. High thermal stability and good light stability. ② It does not react with other additives in plastics. It is non-toxic, odorless and pollution-free, and transparent products can be made. ③ Do not reduce the electrical properties and other physical and mechanical properties of the products, and do not reduce the secondary processing properties, such as printability, adhesion, weldability, etc. ④ Easy to use, low price,
Light stabilizer is a substance to improve the light stability of polymer materials. It can shield ultraviolet waves, reduce the transmission of ultraviolet rays, or absorb high-energy ultraviolet rays (wavelength 290~400nm) for energy conversion, release energy in the form of heat energy or harmless longer wavelength, or quickly return the polymer excited by ultraviolet rays to a stable ground state, so as to protect the polymer materials from ultraviolet damage. PVDF film production line wwww handern. com\
Light stabilizers can be roughly divided into four categories. Ultraviolet absorbers absorb ultraviolet rays and transfer light energy into heat energy, such as o-hydroxybenzophenones, UV-9, uv-24, UV-531, etc. PVDF film production line wwww handern. com
② Line structure row, the role of purple line absorbent. Such as benzoic acid esters.
③ UV quenching agent transfers the energy of molecules in the excited state and returns to the stable ground state.
④ Light shielding agent turns harmful light waves into heat energy to emit or emit light waves. Such as carbon black, titanium dioxide, etc.
The selection of light stabilizer should meet the following conditions.
① It can effectively eliminate or weaken the destructive effect of ultraviolet rays on polymers without affecting other properties of polymers.
② Light stabilizer itself has excellent light stability and is not destroyed by light energy.
③ While absorbing ultraviolet light, the absorbent also absorbs visible light, but the absorption of visible light is low, and it does not stain or change color.
④ Good thermal stability and chemical stability, stable during processing, and does not affect the processing performance of the polymer.
⑤ Low toxicity and low price.
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