Plasticizer Increases Toughness Of Polymers
Plasticizer is the largest additive variety in modern plastic industry and plays a decisive role in promoting the development of plastics industry, especially in PVC industry.
Where the resin is mixed evenly, no chemical change occurs when mixing, but it can reduce the glass temperature of the material and the melt viscosity of the plastic forming process, Plasticizer and keep it unchanged, or can change the chemical properties of the resin in the plastic products for a long time, Plasticizer although it can be chemically changed, and the liquid organic compounds with these properties or the low melting point solids, are called plasticizers.
Plasticizer plays an indispensable role in high quality plastic products. Its variety structure is constantly adjusting and changing, the development speed of new technology is speeding up, the newer variety is more and more, the detection means are more advanced, the evaluation method is more reasonable, and the plasticizer is improving in the cycle of "development-application-toxicology test-risk assessment-redevelopment". Therefore, the correct use of plasticizers is the industry can be healthy development of the key. To do this, plasticizer enterprises should work the structural adjustment. Abroad is being vigorously promoted as non-toxic or environmentally friendly and biodegradable plasticizers.
Plasticizers are usually a "class of solvents" substances, added to plastics, Plasticizer resins or elastomers and other substances can improve their processing, increase plasticity, flexibility, tensile or expansive substances. Adding plasticizer can reduce the melt viscosity, glass temperature and elastic modulus of the elastomer without changing the basic chemical properties of the plasticized material.
Plasticizers can change the properties of polymers and are generally considered:
The ① plasticizer isolates the polymer's macromolecules from the distance, weakening the intermolecular Force (attraction) of the polymer, Plasticizer which weakens the van der Waals force between the resin molecules;
Non-polar plasticizers were added to nonpolar polymers, which cut off the polarity of the polymer molecules, so that they did not have a polar connection, which ② the dipole-dipole interaction between the polymer molecules.
③ plasticizers are combined with resins, rather than chemically bonded (covalent bonds).
Therefore, where the resin can be mixed evenly, Plasticizer mixing without chemical reaction, after mixing can change some of the properties of the resin, can be retained in plastic products for a long time, change the nature of plastic products, can be used as plasticizers. The substances with these functions are many liquid organic compounds or low melting point solids. They must have polarity, can be compatible with resin, in the resin for a long time, Plasticizer the resin has good performance, high efficiency and cheap.
Plasticizers can play a great role in changing the properties of polymers, the processing of polymers and the performance of products.
① Plasticizer reduces the glass temperature of the polymer.
② Plasticizer changes the structure of the polymer so that the plasticized substance is soft.
③ Plasticizer increases the elongation of polymers and reduces tensile strength.
④ Plasticizer increases toughness of polymers and improves impact resistance.
⑤ Plasticizer improves low-temperature performance.
⑥ reduces the viscosity of polymers and improves the processing of polymers and their mixtures of ingredients.
⑦ changes the fluidization properties of polymers, Plasticizer especially products with high polymer content.
⑧ reduce melt temperature, reduce gel temperature, shorten mixing time, reduce extrusion pressure (easy melt can be processed on various types of equipment, reduce the use of adhesive temperature, improve the smoothness of brushing).
⑨ uses the plasticizer in the product to improve the interaction with water: hydrophilic plasticizer to increase the absorption of water products, Plasticizer increase the ripening speed of water products, reduce or increase adhesion, initiation expansion, and so on; hydrophobic plasticizers reduce the sensitivity of products to water.
⑩ helps to disperse liquid and solid additives. The effect of fillers, dyes and other liquid additives easily soluble in plasticizers is more obvious.
Increase or decrease the conductivity or insulation of the product.
Improve the sensitivity of products to combustion, increase the flame-retardant, inhibit the amount of smoke.
Plasticized biodegradable. Degradable plasticizers can be added to biodegradable substances, and the degradation rate of the products can be increased rapidly.