41results about How to "Increase natural degradation rate" patented technology

The invention relates to moisture absorbing and sweat releasing polyester fibers and a preparation method thereof. The preparation method comprises the following step: preparing polyester FDY yarns from a polyester melt according to a FDY process by using a cross-shaped spinneret plate to obtain the moisture absorbing and sweat releasing polyester fibers, wherein doped and modified ZrO powder is dispersed in the polyester melt. The doping and modifying process comprises the following steps: first, mixing a solution containing metal ions Mx<+> and a solution containing Zr4<+> uniformly; then dropwise adding a precipitator till the pH value of the solution is 9-10; and finally, calcining the precipitated product, wherein the metal ions Mx<+> are more than one of Mg2<+>, Li<+> and Zn2<+>. Thecross sections of the prepared moisture absorbing and sweat releasing polyester fibers are cross-shaped. The intrinsic viscosity of the moisture absorbing and sweat releasing polyester fibers is reduced by 10-16% if being placed for 60 months under the condition that the temperature of the moisture absorbing and sweat releasing polyester fibers is 25 DEG C and the relative humidity is 65%. The preparation method is simple in process and low in price. The prepared product is high in natural degrading speed, excellent in mechanical property and moisture absorbing and sweat releasing property, and has a good application prospect.

The invention relates to a feather-like polyester fiber and a preparation method thereof. The preparation method is as follows: firstly mix terephthalic acid, ethylene glycol, dihydric alcohol containing silicon in the main chain and fluorine-containing dibasic acid, and then carry out esterification successively. Chemical reaction and polycondensation reaction to prepare modified polyester, and then use flat four-connected annular spinneret to prepare modified polyester POY yarn from modified polyester melt according to POY process, and then process modified polyester POY yarn according to DTY process Modified polyester DTY filaments are made to obtain feather-like polyester fibers; the spinneret holes of the flat four-connected ring spinneret are flat four-connected rings. The dye uptake rate of the prepared product is 89.6-93.7% at a temperature of 130°C, and its intrinsic viscosity decreases by 13-20% after being placed for 60 months at a temperature of 25°C and a relative humidity of 65%. The preparation method of the invention has simple process and low cost; the prepared product has excellent dyeing performance, fast natural degradation rate and good application prospect.

The invention relates to a flame-retardant polyester fiber and a preparation method thereof. The preparation method includes the step that modified polyester FDY yarn, namely the flame-retardant polyester fiber, is prepared from a modified polyester melt according to the FDY process. A preparation method of modified polyester comprises the step that terephthalic acid, ethylene glycol, 2-CEPPA, 2,5,6,6-tetramethyl-2,5-heptandiol and doped modified Bi2O3 powder are evenly mixed and subjected to an esterification reaction and a polycondensation reaction in sequence, wherein the structural formulaof 2,5,6,6-tetramethyl-2,5-heptandiol is shown in the description. The dye-uptake of the prepared product is 85.3-89.2% under the temperature condition of 120 DEG C, and the K / S value is 22.35-25.43;after the product is placed for 60 months under the condition that the temperature is 25 DEG C and the relative humidity is 65%, the characteristic viscosity of the product is reduced by 13-18%. Thepreparation method is low in cost and simple in process; the prepared product has excellent dyeing property and natural degradability.

The invention relates to a degradable polyester fiber and a preparation method thereof. The preparation method is as follows: a modified polyester FDY filament is prepared from a modified polyester melt according to an FDY process, and a degradable polyester fiber is obtained; the modified polyester The molecular chain of the ester includes a terephthalic acid segment, an ethylene glycol segment, a 2,5,6,6-tetramethyl-2,5-heptanediol segment and a fluorine-containing dibasic acid segment; The dibasic acid is 2,2-difluoro-1,3-malonic acid, 2,2-difluoro-1,4-succinic acid, 2,2-difluoro-1,5-glutaric acid or 2 ,2,3,3‑tetrafluoro‑1,4‑succinic acid; doped modified ZrO dispersed in modified polyester 2 Powder. After the prepared product is placed for 60 months under the condition of 25°C and 65% relative humidity, its intrinsic viscosity decreases by 23-28%. The preparation method of the invention has low cost and simple process; the obtained product has a fast natural degradation rate and has great application prospects.

The invention relates to ultrafine-denier polyester fiber low-stretch yarn and a preparation method thereof. The preparation method comprises the steps: preparing modified polyester POY (Pre-OrientedYarn) from modified polyester melt by a POY process, and preparing modified polyester DTY (Draw Textured Yarn) from the modified polyester POY by a DTY process, thereby obtaining the ultrafine-denierpolyester fiber low-stretch yarn, wherein a molecular chain of modified polyester comprises a terephthalic acid chain segment, an ethylene glycol chain segment, a tert-butyl side group containing diacid chain segment and a 2,5,6,6-tetramethyl-2,5-heptandiol chain segment; solid base catalyst powder subjected to high-temperature roasting is dispersed in the modified polyester. Characteristic viscosity of the prepared product is lowered by 13% to 20% after the prepared product is placed for 60 months under the condition that the temperature is 25 DEG C and the relative humidity is 65%; the dye uptake is 86.3% to 91.5% at the temperature of 123 DEG C. The preparation method disclosed by the invention is simple in process and low in cost; the prepared product is excellent in dyeing behavior, high in natural degradation rate and good in application prospect.