43results about How to "Natural degradation rate is fast" patented technology

The invention relates to double-component orange slice type compound fibers and a preparation method thereof. The preparation method comprises the following steps: first, uniformly mixing terephthalicacid, 1,4-butanediol, dihydric alcohol with a tertiary butyl side group, binary acid with a tertiary butyl side group and doped and modified Bi2O3 powder, and successively carrying out esterificationreaction and polycondensation to prepare modified polyester; and carrying out metering, extruding in a same yarn spray hole in an orange slice type yarn spray plate, cooling, oiling, stretching, thermal setting and coiling on a modified polyester melt and a chinlon melt by means of a compound spinning method to prepare the double-component orange slice type compound fibers, wherein the doped andmodified Bi2O3 powder is dispersed in chinlon. The intrinsic viscosity of the product placed for 60 months at a temperature of 25 DEG C and relatively humidity of 65% is reduced by 16-21%. The intrinsic viscosity of the modified polyester is reduced by 14-19%. The preparation method is simple in process and low in cost. The prepared product is high in natural degrading rate and good in applicationprospect.

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 comprises the steps that modified polyester FDY filament is prepared from modified polyester melt according to an FDY process, and the degradable polyester fiber is obtained; the molecular chain of the modified polyester comprises a terephthalic acid chain segment, an ethylene glycol chain segment, a 2,5,6,6-tetramethyl-2,5-heptanediol chain segment and a fluorine-containing dicarboxylic acid chain segment; fluorine-containing dicarboxylic acid is 2,2-difluoro-1,3-malonic acid or 2,2-difluoro-1,4-succinic acid or 2,2-difluoro-1,5-glutaric acid or 2,2,3,3-tetrafluoro-1,4-succinic acid; modified ZrO2 doped powder is dispersed in modified polyester. After the obtained product is placed for 60 months on the conditions that the temperature is 25 DEG C, and the relative humidity is 65%, the intrinsic viscosity is lowered by 23-28%. The preparation method is low in cost and simple inprocess; the prepared product is high in natural degradation rate, and has great application prospects.

The invention relates to a wool-like polyester filament and a preparation method thereof. The preparation method comprises the steps: firstly, terephthalic acid, 1,4-butanediol, fluorinated diacid, hexanediol with tertiary butyl side groups, and 2,5,6,6-tetramethyl-2,5-heptanediol are evenly mixed, and then an esterification reaction and a polycondensation reaction are carried out successively toprepare modified polyester; then a modified polyester POY filament is prepared from modified polyester flux according to a POY process; and finally a modified polyester DTY filament is prepared from the modified polyester POY filament according to a DTY process, and then the wool-like polyester filament is obtained. According to a prepared product, when the temperature is 100 DEG C, the dye-uptakeis 90.32-93.27%, and the K/S value is 22.15-23.42; after the product is placed at temperature of 25 DEG C and the relative humidity of 65% for 60 months, the intrinsic viscosity of the product is lowered by 17-20%; and the preparation method is low in cost and simple in process, and the prepared product is excellent in dyeing property and high in natural degradation speed, and has great application prospects.

The invention relates to a cationic-dyeable polyester fiber and a preparation method thereof. The preparation method comprises the following steps: preparing cationic modified polyester FDY filamentsfrom cationic modified polyester melt according to an FDY process, thereby obtaining the cationic-dyeable polyester fiber. The molecular chains of the cationic modified polyester comprise terephthalicacid segments, ethylene glycol segments, sodium m-phthalate sulfonate segments and dihydric alcohol segments with tert-butyl side groups; the structural formula of the dihydric alcohol with tert-butyl side groups is as shown in the specification; and solid heteropoly acid powder subjected to high-temperature roasting is dispersed in the cationic modified polyester. The prepared product has dye-uptake of 87.8-92.2% under the temperature condition of 120 DEG C and the K/S value of 23.27-25.67; and after the product is placed under the conditions that the temperature is 25 DEG C and the relativehumidity is 65% for 60 months, the intrinsic viscosity is reduced by 13-17%. According to the preparation method disclosed by the invention, the addition amount of the third monomer is small, the cost is low, and the process is simple; and the prepared product is excellent in dyeing property and national degradation property.

The invention discloses a novel medical composite material and a preparation method thereof. The novel medical composite material is prepared from the following raw materials in parts by weight: 20 to 30 parts of polypropylene, 20 to 30 parts of polylactic acid, 10 to 20 parts of starch, 65 to 90 parts of plant fibers, 1 to 2 parts of digitaria sanguinalis, 1 to 2 parts of lubricant, 1 to 2 parts of plasticizer, 1 to 2 parts of antifreezing agent, 1 to 3 parts of cross-linking agent and 1 to 2 parts of waterproof agent. The degradable novel medical composite material prepared by the method is high in tensile strength, bending strength and elongation at break, high in natural degradation speed, water-proof and suitable for producing medical bag products. The preparation method of the novel composite material is simple, and suitable for industrialized mass production.

The invention relates to a feather-like polyester fiber and a preparation method thereof. The preparation method comprises the steps: firstly, terephthalic acid, ethylene glycol, dihydric alcohol witha main chain containing silicon, and fluorinated diacid are evenly mixed, and then an esterification reaction and a polycondensation reaction are carried out successively to prepare modified polyester; and then a modified polyester POY filament is prepared from modified polyester flux through a flat four-linking-ring-shaped spinneret plate according to a POY process, then a modified polyester DTYfilament is prepared from the modified polyester POY filament according to a DTY process, and then the feather-like polyester fiber is obtained. Spinneret orifices of the flat four-linking-ring-shaped spinneret plate are in a flat four-linking-ring shape. According to a prepared product, when the temperature is 130 DEG C, the dye-uptake is 89.6-93.7%; when the temperature is 25 DEG C and the relative humidity is 65%, after the product is placed for 60 months, the intrinsic viscosity of the product is lowered by 13-20%; and the preparation method is simple in process and low in cost, and the prepared product is excellent in dyeing property and high in natural degradation speed, and has good application prospects.

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 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.

The invention relates to a moisture-absorbing and sweat-releasing polyester fibre and a preparation method thereof. The preparation method comprises the following steps: adopting an H-shaped spinneretplate to prepare modified polyester FDY filaments from modified polyester melt according to an FDY process, thereby obtaining the moisture-absorbing and sweat-releasing polyester fibre. The preparation method for modified polyester comprises the following steps: sequentially performing esterification reaction and polycondensation reaction after terephthalic acid, glycol, hexylene glycol with a tertiary butyl side group and doped modified ZrO2 powder are uniformly mixed. A structural formula of the hexylene glycol with the tertiary butyl side group is as follows: the formula is shown in the description. The prepared product has a dyeing rate of 86.7-90.2% under a temperature condition of 120 DEG C, and has a K/S value of 22.58-25.72; after being placed for 60 months under conditions with atemperature of 25 DEG C and relative humidity of 65%, intrinsic viscosity of the moisture-absorbing and sweat-releasing polyester fibre is reduced by 14-21%. The preparation method disclosed by the invention is low in cost and is simple in process; and the prepared product is excellent in dyeing performance, is quick in natural degradation rate, and has a promising application prospect.

The invention relates to modified polyester fibers containing a solid base catalyst and a preparation method thereof. The preparation method includes the steps that according to a POY technology, after modified polyester melts are prepared into modified polyester POY filaments, and then according to a DTY technology, the modified polyester POY filaments are processed and prepared into the modifiedpolyester fibers containing the solid base catalyst; a modified polyester molecular chain comprises a terephthalic acid chain segment, an ethylene glycol chain segment and 2,5,6,6-tetramethyl-2,5-heptanediol chain segment, the structural formula of 2,5,6,6-tetramethyl-2,5-heptanediol is shown in the specification, and solid base catalyst powder which is roasted at high temperature and doped and modified Sb2O3 powder are dispersed in modified polyesters. After the prepared product is put for 60 months under the conditions that the temperature is 25 DEG C and relative humidity is 65%, the intrinsic viscosity is decreased by 18-24%. The preparation method is low in cost and simple in technology; the prepared product is high in natural degrading rate and has broad application prospects.

The invention relates to full-dull network stretch yarn and a preparation method thereof. The preparation method comprises the steps that terephthalic acid, ethanediol, 2,5,6,6-tetramethyl-2,5-heptandiol, a dulling agent and solid alkali catalyst powder subjected to high-temperature roasting are evenly mixed, then an esterification reaction and a polycondensation reaction are conducted successively to prepare modified polyester, then modified polyester pre-oriented yarn (POY) is prepared from a modified polyester melt through a POY process, finally, modified polyester draw texturing yarn (DTY)is prepared from the modified POY through a DTY process, and thus the full-dull network stretch yarn is obtained; and the dulling agent and the solid alkali catalyst powder subjected to high-temperature roasting are dispersed into the modified polyester. After a prepared product is placed for 60 months under the conditions that the temperature is 25 DEG C and the relative humidity is 65%, the intrinsic viscosity is decreased by 13%-18%. The preparation method of the full-dull network stretch yarn is simple in process and low in cost; and the prepared product is high in natural degradation rate and good in application prospect.

The invention relates to a semi-dull polyester pre-oriented yarn and a preparing method thereof. The preparing method includes the step of preparing polyester POY yarn from polyester melt through a POY process to obtain the semi-dull polyester pre-oriented yarn. A preparing method of polyester includes the steps of evenly mixing terephthalic acid, ethylene glycol, a delustering agent, doped and modified Bi2O3 powder, doped and modified Sb2O3 powder and multi-phase solid acid-base powder calcinated at a high temperature, and sequentially conducting esterification reaction and condensation polymerization reaction, wherein the content of the delustering agent is 0.20-0.27 wt%. The specific viscosity of the prepared product is reduced by 14-17% after the product is placed under the temperatureof 25 DEG C and the relative humidity of 65% for 60 months. The preparing method is simple in process and low in cost, reduces the addition amount of an antimony catalyst and reduces the antimony emission; the prepared product is high in natural degrading speed, good in hue and good in application prospects.

The invention relates to a polyester and nylon sheath core composite filament and a preparation method thereof. The method comprises the following steps: uniformly mixing terephthalic acid, ethylene glycol, fluorine-containing binary acid and multi-phase solid acid-base powder which is roasted at a high temperature, and sequentially performing esterification and condensation polymerization to prepare modified polyester; preparing the polyester and nylon sheath core composite filament by using nylon and modified polyester as a sheath material and a core material by adopting a sheath-core compound spinning method according to the FDY process, wherein the high-temperature roasted multi-phase solid acid-base powder is dispersed in the nylon, and the multi-phase solid acid-base is SiO2-Al2O3 and/or SiO2-MgO; after the product is placed for 60 months at the temperature of 25 DEG C and the relative humidity of 65 percent, the sheath intrinsic viscosity is reduced by 13-18 percent, and the core intrinsic viscosity is reduced by 12-16 percent. The method has a simple process, and the polyester-nylon sheath-core composite filament has high natural degradation efficiency.

The invention relates to a one-step spun elastic composite yarn and a preparation method thereof. The preparation method comprises the following steps: firstly uniformly mixing terephthalic acid, 1,4-butanediol, dihydric alcohol with a trimethylsilyl side group and doped and modified Bi2O3 powder, then successively performing an esterification reaction and a polycondensation reaction to obtain a polyester with relatively low viscosity, performing solid-phase adhesion-promotion on the modified polyester with the relatively low viscosity to obtain a modified polyester with relatively high viscosity, and performing metering, extruding from a same spinneret hole, cooling, oil applying, drawing, heat setting and winding on two modified polyesters with different viscosity by adopting a parallelcomposite spinning method to obtain the one-step spun elastic composite yarn. The finally prepared product has a dye-uptake rate of 87.3-92.2% at a temperature of 100 DEG C, and the intrinsic viscosity of the product decreases by 15-22% after the product is left for 60 months at a temperature of 25 DEG C and a relative humidity of 65%. The preparation method provided by the invention has the advantages of simple process and low cost; and the obtained product has excellent dyeing performance, high natural degradation rate and good application prospects.