Wuhan Handern plasticizer requirements

日期:2020/6/3 8:46:12 / 阅读: / 来源:本站

Wuhan Handern plasticizer requirements

     An ideal plasticizer should meet the following requirements
     (1) Compatibility with resin Compatibility refers to the amount of resin that absorbs plasticizer, and no longer precipitates after being processed and plasticized. It is the nature of plasticization. It is generally measured by solubility parameter (S), interaction parameter (x), viscosity, cloud point, etc. The solubility parameter is the square root of the solvent evaporation energy per unit volume (that is, the cohesive energy density CFD), which is closely related to the dielectric constant (E) of the solvent, the even root moment of the solvent itself, and hydrogen health. Generally, the solubility is mostly in color, 4- The dielectric constant of 114 is about 3-8, so it has good compatibility with PVC. www.handern.com Cast film equipment
      (2) Workability The processability of the starting compound formulated with a good compatibility extender is also good. When extruding, the influence of lubricants and stabilizers with poor compatibility should also be considered. When they are used When it is larger, if you use fat-proofing esters and hydrogenated paraffin, and other extenders, you should pay attention to the exudation of plasticizers. www.handern.com Cast film equipment
     (3) Plasticization efficiency refers to the amount of plasticizer that makes the resin reach a certain degree of softness. www.handern.com Cast film equipment First, the plasticizing efficiency is expressed by the decrease of glass transition temperature and modulus. This is the most important method of measuring chain mobility.
     (4) The anti-plasticizing effect is within a certain range. Adding a small amount of plasticizer will cause the decrease of the clock rate, the reduction of the shock strength and the embrittlement phenomenon. This is the anti-plasticizing effect, and you should pay attention to selecting the appropriate Dosage.
     (5) Cold resistance Plasticizers with good compatibility are poor in cold resistance, especially the cold resistance of plasticizers containing cyclic structure is significantly reduced. In Sakasaka, the linear aliphatic methylene (-CB-)-based aliphatic house has good coldness. The longer the carbon chain, the better the coldness. Its compatibility and efficiency increase deteriorated and could not be used. At present, fatty acid dibasic acid esters are mainly used as cold-resistant plasticizers. www.handern.com Cast film equipment
     (6) Aging The aging of plastics mainly depends on the effects of heat stabilizers, antioxidants and light stabilizers, but it requires plasticizers to withstand the molding temperature and prevent their thermal decomposition. Straight alkyls are stable, but the stability of extenders with a large free radical offset is poor. Epoxy plasticizers can also be used as stabilizers, which have a synergistic effect when used together with metal stabilizers. www.handern.com Cast film equipment
     (7) Durability Including volatility, extraction resistance and migration. www.handern.com Cast film equipment
      ① The volatile plasticizer is converted into gas from the surface after heating. Plasticizers with a molecular weight (AMD) above 350 are required, because the molecular weight is small and the volatility is high. Plasticizers with good compatibility with PVC are more volatile (see Table 3-3), and polymeric plasticizers with larger groups and larger molecular weights in the molecule are less volatile. www.handern.com Cast film equipment
      ②Extractability mainly refers to chemical extractability, usually including oil, solvent, rain and soap water resistance. This depends on the structure, polarity and molecular weight of the plastic and plasticizer, as well as the physical and chemical properties of the medium in contact with the plastic. For example, a plasticizer with a large proportion of alkyl groups in the molecular salt structure is resistant to gasoline or oil Solvent extraction is poor, but the water and fertilizer water resistance is very good.
      ③Migration refers to the extension of the extender to the contact layer of the product, including internal diffusion and protection to the contact layer. The migration phenomenon often causes the product to soften, sticky, or even the surface drunk or cause product contamination. www.handern.com Cast film equipment
     (8) Electrically insulating plasticizers tend to reduce the electrical insulation of plastics. Cold polarizing agents with weak polarities greatly reduce the volume resistance. When the resistance is strong, acid plasticizers have better electrical properties. , Plasticizers with many intramolecular branches and poor type ratios also have good electrical properties. The electrical properties of sensitizers containing ionic impurities will be significantly affected. www.handern.com Cast film equipment
     (9) Flame retardancy Plastics for construction and electrical use require flame retardancy, noodles are highly flame retardant, and chlorinated stone dance is inexpensive. www.handern.com Cast film equipment
    (10) Toxicity General extenders have certain toxicity. Noodles are used as food packaging materials, children's toys and other materials, and their toxicity should be considered. Epoxy anti-reflection agents, DOP, DOA, DDA, chlorinated paraffin, etc. are low-toxic and can be used as food packaging materials.
    (11) Antimicrobial resistance Wires, electricity, agricultural films, building materials, etc. should be considered to be invaded by microorganisms. Long-chain fatty acids, aliphatic dibasic acid esters, etc. are susceptible to damage, while phosphonitrates and phosphoric acids have strong antibacterial properties. www.handern.com Cast film equipment

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