High-viscosity polyester for the selection of masterbatch formulation components for improving the rheological properties of high-viscosity polyesters

Industrial polyester monofilaments, such as papermaking nets, monofilaments for industrial filters, etc., are usually spun from high-viscosity polyester chips (inherent viscosity 0.9 dIl/g), but high-viscosity polyester chips are relatively The molecular mass is high, the long-chain macromolecules are easily entangled, the interaction between molecules is significantly increased, and the melt flow performance is extremely poor. If the spinning temperature is increased to improve the fluidity, the relative molecular mass is lowered, and the intrinsic viscosity is greatly decreased, which affects the unique properties of the high-viscosity monofilament. By blending and modifying the method, adding additives to improve the fluidity of the high-viscosity polyester chips, preparing the modified masterbatch, and blending and spinning with the high-viscosity polyester chips, can smoothly spin the industrial performance with excellent performance. Polyester monofilament.

Selection of recipe components:

1, lubricant

Polyester is a highly polar polymer, and generally uses internal and external lubricants with relatively high molecular weight. Commonly used are stearic acid, stearyl alcohol, montanic acid and its derivatives (soap, ester), trihydroxystearic acid glyceride, ethylene bis-lipidamine and the like.

TaF is a polar group introduced on the basis of an ethylene bis fatty acid amide, and its structure is a low relative molecular mass BaB type copolymer. The polar group of TaF can be strongly attracted to the long chain end of the coupling agent by van der Waals force, and the solvated segment has a certain compatibility with the polyester matrix. Therefore, the experiment selected the lubricant TaF.

2, inorganic powder

The inorganic powder is surface-treated and uniformly dispersed in the PET resin to lower the melt viscosity. At the same time, as the particle size of the inorganic filler particles becomes finer, the specific surface area increases, and the contact interface between the filler and the polyester increases. Improve the uniformity of dispersion of the filler in the resin. In the experiment, the inorganic powder was selected as ultrafine calcium carbonate. The inorganic ultrafine calcium carbonate powder has small particle size, large specific surface area, high energy surface energy, and is hydrophilic and easy to agglomerate; while polyester fiber material has low energy surface energy and is hydrophobic, and the two are incompatible. . Treatment of the ultrafine calcium carbonate powder with a coupling agent improves the compatibility with the polyester.

3, coupling agent

The coupling agent increases the affinity between the inorganic substance and the organic polymer, and has an amphoteric structure. It can form a strong chemical bond between the inorganic powder and the polymer through physical entanglement or a certain chemical reaction, so that two materials with different properties are tightly combined. Considering that the titanate coupling agent is dyed brown-red in combination with TaF, the surface modification of the ultrafine calcium carbonate powder is carried out by using an aluminate coupling agent, and the alkoxy group and the powder at one end of the aluminum center of the coupling agent are passed through the coupling agent. The surface groups of the surface are covalently bonded to form a molecular film on the surface of the powder, and the long chain at the other end is entangled with the molecular chain of the polyester matrix, so that the inorganic powder is uniformly dispersed in the polyacetate matrix and is not easily agglomerated.

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