98results about How to "Destruction of structural regularity" patented technology

The invention relates to a multi-hole polyester fiber DTY (draw textured yarn) and a preparation method thereof. According to the preparation method, modified polyester is spun to prepare the multi-hole polyester fiber DTY by the aid of a multi-hole spinneret plate; spinneret holes in the multi-hole spinneret plate are elliptically arrayed, namely, the hole centers of the spinneret holes are positioned on concentric ellipses, the concentric ellipses are series ellipses, long axes of the all ellipses are collinear, short axes of the all ellipses are collinear, the modified polyester is used for preparing a POY (polyester pre-oriented yarn) and then further processed to obtain the multi-hole polyester fiber DTY. A preparation method of the modified polyester includes the steps: performing reaction for terephthalic acid and ethylene glycol to prepare terephthalic acid ethylene glycol ester; adding the terephthalic acid and dihydric alcohol with branching chains, and performing reaction for mixture to prepare terephthalic acid dihydric alcohol ester; continuing to react to obtain the modified polyester. According to the method, prepared fibers are excellent in performance, the deviation ratio of linear density of the DTY is smaller than or equal to 2.0%, a breaking strength CV (variation coefficient) value is smaller than or equal to 4.0%, a breaking elongation CV value is smaller than or equal to 8.0%, and a CV value of crimping shrinkage rate is smaller than or equal to 8.0%.

The invention relates to a high-uniformity polyester industrial yarn used for a safety belt and a production method thereof. The raw material of the high-uniformity polyester industrial yarn is modified polyester composed of a terephthalic acid chain segment, a glycol chain segment and a branched chain-containing dihydric alcohol chain segment. The production method is characterized in that terephthalic acid and branched chain-containing dihydric alcohol are subjected to an esterification reaction under catalysis of concentrated sulfuric acid to obtain dihydricalcohol terephthalate; then terephthalic acid and glycol are prepared for the esterification reaction to obtain ethylene terephthalate; finally ethylene terephthalate and dihydricalcohol terephthalate are stirred and mixed, under a catalyst and a stabilizing agent, the condensation polymerization reactions under a low vacuum phase and a high vacuum phase are carried out to prepare the modified polyester, and the modified polyester is subjected to metering, extrusion by a porous spinneret, cooling, oiling, stretching, thermoforming and reeling to prepare the high-uniformity polyester industrial yarn.

The invention relates to a high-uniformity colored polyester industrial yarn and a preparation method thereof. The raw material of the high-uniformity colored polyester industrial yarn is modified polyester composed of terephthalic acid chain segments, ethylene glycol chain segments and dihydric alcohol chain segments containing branched chains. The method for preparing the high-uniformity colored polyester industrial yarn comprises the following steps: carrying out an esterification reaction between terephthalic acid and dihydric alcohol containing branched chains under catalysis of concentrated sulfuric acid, thereby obtaining polyethylene terephthalate; matching terephthalic acid and ethylene glycol to carry out an esterification reaction, thereby obtaining ethylene glycol terephthalate; finally, stirring and mixing the two products, carrying out condensation polymerization at low vacuum stage and high vacuum stage in the absence of catalysts and stabilizers, thereby obtaining modified polyester; metering the modified polyester, adding black master batch, performing porous spinneret extrusion, cooling, oiling, stretching, heat setting, winding, thereby obtaining the high-uniformity colored polyester industrial yarn.

The invention relates to a porous super-bright trilobal profiled polyester fiber and a production method thereof. Modified polyester is spun by adopting a porous spinneret with the cross section shape of spinneret micro-pores being trilobal in order to produce the porous super-bright trilobal profiled polyester fiber; the spinneret micro-pores are arranged in the porous spinneret in an elliptical manner, the pore center of every spinneret micro-pore is positioned in a concentric ellipse, concentric ellipses are serial ellipses, the long axes of all the ellipses are collinear, and the short axes of all the ellipses are collinear. A preparation method of the modified polyester comprises the following steps: reacting terephthalic acid with ethylene glycol to prepare ethylene terephthalate, adding diol terephthalate prepared from terephthalic acid and branched chain-containing diol, and continuously reacting to obtain the modified polyester. The porous super-bright trilobal profiled polyester fiber produced in the invention has excellent performances, the liner density deviation ratio is not greater than 0.5%, the breaking strength CV value is not greater than 4.0%, the fracture elongation CV value is not greater than 8.0%, and the yarn unevenness CV value is not greater than 2.0%.

The invention relates to a differential shrinkage composite filament and a preparing method thereof. According to the invention, modified polyester employs a porous spinneret for spinning to prepare the differential shrinkage composite filament; an arrangement mode of the spinneret holes on the porous spinneret is in an elliptical shape, the aperture center of the spinneret holes is positioned on concentric ellipses, the concentric ellipses are a series of ellipses, the long shafts of all ellipses are collinear, and the short shafts are collinear. The differential shrinkage composite filament is subjected to plying and doubling by modified polyester POY filament and FDY filament, then is composited through network, and finally reeled. A preparation method of the modified polyester comprises the following steps: terephthalic acid and glycol are subjected to a reaction to prepare ethylene glycol terephthalate, terephthalic acid and branched chain-containing dihydric alcohol are subjected to a reaction to obtain terephthalic acid glycol ester, and continuous reacting is carried out on the material to obtain the product. The filament has excellent fiber performance, the linear density deviation ratio is less than or equal to 2.0%, a breaking tenacity CV value is less than or equal to 4.0%, a breaking elongation CV value is less than or equal to 8.0%, and a crimp contraction variation coefficient CV value is less than or equal to 8.0%.

The invention relates to porous PTT (polytrimethylene terephthalate)-fiber HOY (high oriented yarn) and a preparation method thereof. According to the preparation method, the porous PTT-fiber HOY is prepared from modified PTT by spinning with a porous spinneret; spinneret orifices in the porous spinneret are arranged in an oval shape, that is, the centers of the spinneret orifices are located on concentric ellipses adopting series ellipses, major axes of all the ellipses are collinear, and minor axes of all the ellipses are collinear. The porous PTT-fiber HOY is prepared from modified PTT through measurement, extrusion, cooling, oiling and winding. A preparation method of modified PTT comprises the steps as follows: terephthalic acid and 1,3-propanediol react, trimethylene terephthalate is prepared, diol terephthalate prepared from terephthalic acid and branched-chain-containing diol through a reaction is added, reaction is continued, and modified PTT is obtained. The prepared HOY has excellent fiber performance, the deviation rate of linear density is lower than or equal to 0.2%, the breaking strength CV value is lower than or equal to 2.5%, and the breaking elongation CV value is lower than or equal to 5.0%.

The invention relates to a high-homogeneity car model polyester industrial yarn and a preparation method thereof. The high-homogeneity car model polyester industrial yarn uses modified polyester formed by a terephthalic acid chain segment, an ethylene glycol chain segment and branched chain-containing diol as a raw material. The preparation method of the high-homogeneity car model polyester industrial yarn comprises the following steps: subjecting the terephthalic acid and the branched-chain diol to an esterification reaction under the catalysis of concentrated sulfuric acid to obtain dihydroxy alcohol terephthalic acid; subjecting the terephthalic acid and the ethylene glycol to an esterification reaction to obtain dimethyl terephthalate; finally stirring and mixing the two, subjecting a polycondensation reaction at low vacuum phase and high vacuum stage under the action of a catalyst and a stabilizer to obtain modified polyester, subjecting the modified polyester to metering, porous spinneret extruding, cooling, oiling, stretching, heat setting and winding to obtain the high-homogeneity car model polyester industrial yarn.

The invention relates to a porous soft polyester fiber FDY yarn and a preparing method thereof. According to the invention, modified polyester employs a porous spinneret for spinning to prepare the porous soft polyester fiber FDY yarn; an arrangement mode of the spinneret holes on the porous spinneret is in an elliptical shape, the aperture center of the spinneret holes is positioned on concentric ellipses, the concentric ellipses are a series of ellipses, the long shafts of all ellipses are collinear, and the short shafts are collinear. the porous soft polyester fiber FDY yarn is prepared by metering modified polyester slices, extruding, cooling, oiling, stretching, thermoforming and reeling the material. A preparation method of the modified polyester comprises the following steps: terephthalic acid and glycol are subjected to a reaction to prepare ethylene glycol terephthalate, terephthalic acid and branched chain-containing hexanediol are subjected to a reaction to obtain the terephthalic acid glycol ester, and continuous reacting is carried out on the material to obtain the product. The yarn has excellent fiber performance, the linear density deviation ratio is less than or equal to 0.5%, the breaking tenacity CV value is less than or equal to 4.0%, breaking elongation CV value is less than or equal to 8.0%, and a yarn unevenness CV value is less than or equal to 2.0.

The invention relates to a porous super-soft cotton-like polyester fiber, and a preparation method thereof. According to the preparation method, the porous super-soft cotton-like polyester fiber is prepared from modified polyester via porous spinneret plate spinning; spinneret orifices on a porous spinneret plate are arranged in an elliptical manner, wherein the orifice centers of the spinneret orifices are arranged in a series of concentration ellipses, the long axes of the concentration ellipses are collinear, and the short axes are collinear. The porous super-soft cotton-like polyester fiber is prepared from modified polyester POY yarn and modified polyester FDY yarn. A preparation method of the modified polyester comprises following steps: terephthalic acid is reacted with ethanediol so as to obtain ethanediol terephthalate, terephthalic acid and hexanediol containing branch chains are added are reacted so as to obtain dihydric alcohol terephthalate, and continuous reaction is carried out so as to obtain the modified polyester. The performance of the obtained porous super-soft cotton-like polyester fiber is excellent; linear density deviation ratio is equal to or less than 2.0%; breaking strength CV value is equal to or less than 4.0%; breaking elongation CV value is equal to or less than 8.0%; and crimp contraction variable coefficient CV value is equal to or less than 8.0%.

The invention relates to high-uniformity, high-strength and ultralow-shrinkage type polyester industrial yarn and a preparation method thereof. The high-uniformity, high-strength and ultralow-shrinkage type polyester industrial yarn is prepared from modified polyester formed by terephthalic acid chain segments, glycol chain segments and branch-containing dihydric alcohol chain segments. The preparation method of the high-uniformity, high-strength and ultralow-shrinkage type polyester industrial yarn includes the steps that terephthalic acid and branch-containing dihydric alcohol are subjected to an esterification reaction under catalysis of concentrated sulfuric acid to obtain terephthalic acid dihydric alcohol ester; then terephthalic acid and glycol are matched for an esterification reaction, and terephthalic acid gylcol ester is obtained; finally, terephthalic acid dihydric alcohol ester and terephthalic acid gylcol ester are stirred and mixed, polycondensation at a low-vacuum stage and a high-vacuum stage is carried out under the effects of a catalyst and a stabilizer, modified polyester is prepared and subjected to metering, porous spinneret plate extrusion, cooling, oiling, stretching, heat setting and winding, and the high-uniformity, high-strength and ultralow-shrinkage type polyester industrial yarn is prepared.

The invention relates to porous polyester fibre POY filaments and a preparation method thereof. Porous polyester fibre POY filaments are prepared by spinning modified polyester fibre with a porous spinneret; an arranging mode of spinneret holes on the porous spinneret is in an elliptical arrangement, a center of spinneret holes is positioned on a concentric ellipse, the concentric ellipse comprises a series of ellipses, long axes of all ellipses are collinear, and short axes of all ellipses are collinear. Modified polyester slices are obtained by cutting granules of modified polyester, and the porous polyester fibre POY filaments are prepared by metering, extrusion, cooling, oiling, and reeling of modified polyester slices, and the preparation method of the modified polyester comprises the following steps: a reaction is carried out for terephthalic acid and glycol, in order to obtain ethylene terephthalate; ester of dihydric alcohol and terephthalic acid obtained by reaction between added terephthalic acid and dihydric alcohol containing branched chains is prepared, and a reaction is carried out continuously in order to obtain modified polyester. The filaments have excellent fiber performance, linear density deviation ratio is less than or equal to 0.2%, breaking strength CV value is less than or equal to 2.5%, and fracture elongation CV value is less than or equal to 5.0%.

The invention relates to porous PBT fiber DTY (drawn textured yarn) and a preparation method thereof. The porous PBT fiber DTY is prepared from modified PBT through spinning by a porous spinneret plate; spinneret holes in the porous spinneret plate are arranged in an ellipse, that is, the centers of the spinneret holes are located on concentric ellipses which are a series of ellipses, major axes of the ellipses are collinear, and minor axes of the ellipses are collinear. The porous PBT fiber DTY is prepared from the modified PBT through metering, extruding, cooling, oiling and winding; a preparation method of the modified PBT comprises the following steps: terephthalic acid and 1,4-butanediol react to prepare butanediol 1,4-terephthalate, terephthalic acid and diol containing branched chains are added for a reaction, diol terephthalate is prepared and continuously subjected to a reaction, and modified PBT is obtained. The prepared DTY has excellent performance, the linear density deviation is lower than or equal to 0.2%, the breaking strength CV value is smaller than or equal to 2.5%, and the breaking elongation CV value is smaller than or equal to 5.0%.

The invention relates to a porous flax-like polyester fiber and a preparation method thereof. The porous flax-like polyester fiber is prepared by spinning modified polyester by using a porous spinneret plate, wherein spinneret holes in the porous spinneret plate are elliptically arrayed; i.e., the centers of the spinneret holes are located on concentric ellipses which are series ellipses, the long axes of all the ellipses are collinear, and the short axes of all the ellipses are also collinear. The porous flax-like polyester fiber is prepared from modified polyester POY yarns and modified polyester FDY yarns through process. A preparation method for the modified polyester comprises the following steps: reacting terephthalic acid with glycol to prepare ethylene terephthalate; adding dihydric alcohol terephthalate prepared through reaction of terephthalic acid with propylene glycol containing a branched chain; and continuing reaction so as to obtain the modified polyester. The fiber prepared in the invention has following excellent properties: a linear density deviation ratio of no more than 2.0%, a breaking tenacity CV value of no more than 4.0%, a breaking elongation CV value of no more than 8.0%, and a crimp contraction variation coefficient CV value of no more than 8.0%.

The invention relates to a porous super-soft polyester fiber FDY and a preparation method thereof. The porous super-soft polyester fiber FDY is obtained by spinning modified polyester with a porous spinneret plate; spinneret pores in the porous spinneret plate are arranged in an oval shape, in other words, the centers of the spinneret pores are located on concentric ovals, and the concentric ovals are a series of ovals with the long axes collinear and the short axes collinear. The porous super-soft polyester fiber FDY is obtained by carrying out metering, extruding, cooling, oiling, stretching, heat setting and winding on modified polyester chips. The preparation method of modified polyester includes the steps that terephthalic acid and ethanediol react to obtain ethylene glycol terephthalate, dihydric alcohol terephthalate obtained after terephthalic acid and hexanediol containing branched chains react is added, the substances continue to react, and modified polyester is obtained. The fiber obtained with the method is good in performance, wherein the linear density deviation rate is smaller than or equal to 0.5%, the breaking strength CV value is smaller than or equal to 4.0%, the breaking elongation CV value is smaller than or equal to 8.0%, and the yarn unevenness CV is smaller than or equal to 2.0%.

The invention relates to a high-uniformity, high-strength and low-shrinkage polyester industrial filament and a production method thereof. The above polyester fiber comprises modified polyester, and the modified polyester comprises a terephthalic acid chain segment, an ethylene glycol chain segment and a branched chain-containing diol chain segment. The production method of the polyester fibers comprises the following steps: carrying out an esterification reaction on terephthalic acid and branched chain-containing diol under the catalysis of concentrated sulfuric acid in order to obtain diol terephthalate; carrying out an esterification reaction on terephthalic acid and ethylene glycol to obtain ethylene terephthalate; and mixing the diol terephthalate with the ethylene terephthalate, carrying out low-vacuum stage and high-vacuum stage condensation polymerization reaction under the action of a catalyst and a stabilizer in order to prepare the modified polyester, metering the modified polyester, extruding the modified polyester through a porous spinneret, and carrying out cooling, oiling, stretching, heat setting and reeling in order to produce the high-uniformity, high-strength and low-shrinkage polyester industrial filament.

The invention relates to super-soft wool-like porous polyester and a preparation method thereof. The super-soft wool-like porous polyester is prepared from modified polyester through spinning by a porous spinneret plate; spinneret holes in the porous spinneret plate are arranged elliptically, that is, the centers of the spinneret holes are located on concentric ellipses which are a series of ellipses, major axes of the ellipses are collinear, and minor axes of the ellipses are collinear. The super-soft wool-like porous polyester is prepared from modified polyester POY and modified polyester FDY through processing; a preparation method of the modified polyester comprises the following steps: terephthalic acid and ethylene glycol react to prepare ethylene glycol terephthalate, terephthalic acid and propylene glycol containing branched chains are added for a reaction, glycol terephthalate is prepared and continuously subjected to a reaction, and modified polyester is obtained. The prepared fiber has excellent performance, the linear density deviation is lower than or equal to 2.0%, the breaking strength CV value is lower than or equal to 4.0%, the breaking elongation CV value is lower than or equal to 8.0%, and the crimp contraction variation coefficient CV value is lower than or equal to 8.0%.

The invention relates to high-uniformity military soft polyester industrial yarns and a preparation method thereof. The high-uniformity military soft polyester industrial yarns comprise a raw material of modified polyester composed of a terephthalic acid chain segment, an ethylene glycol chain segment and a branched chain-containing diol chain segment. The preparation method of the high-uniformity military soft polyester industrial yarns comprises the steps: carrying out an esterification reaction of terephthalic acid and branched chain-containing diol under catalysis of concentrated sulfuric acid, to obtain diol terephthalate; then carrying out an esterification reaction of terephthalic acid and ethylene glycol to obtain ethylene glycol terephthalate; and finally, stirring and mixing the diol terephthalate and the ethylene glycol terephthalate, under the action of a catalyst and a stabilizer, carrying out polycondensation reaction at low vacuum stage and in high vacuum stage, to prepare modified polyester, and then carrying out metering, porous spinneret plate extruding, cooling, oiling, stretching, heat setting and winding of the modified polyester, to obtain the high-uniformity military soft polyester industrial yarns.

The invention relates to a modified polyester and a preparation method thereof. The modified polyester is composed of a terephthalic acid segment, a glycol segment, and a branch chain containing dihydric alcohol segment. The branch chain of the branch chain containing dihydric alcohol segment is positioned on one non-terminal carbon of the branch chain containing dihydric alcohol segment, is a straight carbon chain, and contains 5 to 10 carbon atoms. The preparation method comprises the following steps: carrying out esterification reactions between terephthalic acid and branch chain containing dihydric alcohol in the presence of concentrated sulfuric acid to obtain dihydric alcohol terephthalate; then carrying out esterification reactions between terephthalic acid and glycol to obtain ethylene terephthalate; stirring and mixing dihydric alcohol terephthalate and ethylene terephthalate, in the presence of a catalyst and a stabilizing agent, and carrying out condensation reactions in a low vacuum stage and a high vacuum stage to obtain modified polyester. The increased space between the gaps among molecular chains in polyester is far greater than that of branch chain free polyester at a same temperature, so small particles such as dye can more easily enter the interior of modified polyester, and the dyeing speed is increased.

The invention relates to porous polyester fiber FDY and a preparation method thereof. The porous polyester fiber FDY is prepared by spinning modified polyester through a porous spinneret plate; spinneret holes formed in the spinneret plate are arranged in an oval shape, that is to say, hole centers of the spinneret holes are located on concentric ellipses which are series ellipses, the long axes of all the ellipses are collinear, and the short axes of all the ellipses are collinear. The porous polyester fiber FDY is prepared from modified polyester slices through metering, extruding, cooling, oiling, stretching, heat setting and winding; a preparation method of modified polyester comprises the steps that terephthalic acid reacts with ethylene glycol to obtain ethylene terephthalate, terephthalic acid dihydroxy alcohol ester which is prepared through a reaction of terephthalic acid and terephthalic acid containing is added, reacting is conducted continuously, and porous polyester is obtained. The fiber prepared through the method is excellent in performance, the linear density deviation rate is smaller than or equal to 0.5%, the breaking strength CV value is smaller than or equal to 4.0%, the breaking elongation CV value is smaller than or equal to 8.0%, and the yarn unevenness CV is smaller than or equal to 2.0.

The invention relates to a high-uniformity polyester industrial yarn used for an air bag and a production method thereof. The raw material of the high-uniformity polyester industrial yarn is modified polyester composed of a terephthalic acid chain segment, a glycol chain segment and a branched chain-containing dihydric alcohol chain segment. The production method is characterized in that terephthalic acid and branched chain-containing dihydric alcohol are subjected to an esterification reaction under catalysis of concentrated sulfuric acid to obtain dihydricalcohol terephthalate; then terephthalic acid and glycol are prepared for the esterification reaction to obtain ethylene terephthalate; finally ethylene terephthalate and dihydricalcohol terephthalate are stirred and mixed, under a catalyst and a stabilizing agent, the condensation polymerization reactions under a low vacuum phase and a high vacuum phase are carried out to prepare the modified polyester, and the modified polyester is subjected to metering, extrusion by a porous spinneret, cooling, oiling, stretching, thermoforming and reeling to prepare the high-uniformity polyester industrial yarn.

The invention relates to high-uniformity activation type industrial polyester yarn and a preparation method thereof. A raw material of the high-uniformity activation type industrial polyester yarn is modified polyester consisting of a terephthalic acid chain segment, an ethylene glycol chain segment and a glycol chain segment containing branch chains. The preparation method of the high-uniformity activation type industrial polyester yarn comprises steps as follows: terephthalic acid and glycol containing the branch chains are subjected to an esterification reaction under the catalytic action of concentrated sulfuric acid, and glycol phthalate is obtained; then, phthalic acid and ethylene glycol are subjected to an esterification reaction, and ethylene glycol terephthalate is obtained; finally, glycol phthalate and ethylene glycol terephthalate are stirred, mixed and subjected to a condensation reaction at a low-vacuum stage and a high-vacuum stage under the action of a catalyst and a stabilizer, modified polyester is prepared, the modified polyester is treated through steps including metering, porous spinneret plate extrusion, cooling, oiling, stretching, heat setting, application of an activating oiling agent, winding and preactivation, and the high-uniformity activation type industrial polyester yarn is prepared.

The invention relates to a high-uniformity polyurethane coating fabric and a preparation method thereof. The raw material of high-uniformity polyurethane coating fabric industrial yarn is modified polyester composed of terephthalic acid chain segments, ethylene glycol chain segments and dihydric alcohol chain segments containing a branched chain. The preparation method of the high-uniformity polyurethane coating fabric industrial yarn comprises the steps that terephthalic acid and dihydric alcohol containing the branched chain are subjected to an esterification reaction under the catalytic action of concentrated sulfuric acid, and phthalic acid dibasic alcohol ester is obtained; terephthalic acid and ethylene glycol are prepared into slurry to be subjected to an esterification reaction, and terephthalic acid glycol ester is obtained; phthalic acid dibasic alcohol ester and terephthalic acid glycol ester are stirred and mixed, under the action of a catalyst and a stabilizer, a polycondensation reaction in a low vacuum stage and a polycondensation reaction in a high vacuum stage are conducted, and modified polyester is obtained; modified polyester is subjected to solid phase polycondensation tackifying, metering, porous spinneret plate extruding, cooling, oiling, stretching, heat setting and winding, and the high-uniformity polyurethane coating fabric industrial yarn is obtained; a fabric layer is obtained through weaving, the fabric layer is subjected to two dipping and two rolling and coating to be synthesized into polyurethane resin, and the high-uniformity polyurethane coating fabric is obtained.

The present invention relates to a high uniformity high modulus low shrinkage type polyester industrial yarn and a preparation method thereof, wherein the raw material of the high uniformity high modulus low shrinkage type polyester industrial yarn is a modified polyester comprising a terephthalic acid chain segment, an ethylene glycol chain segment and a branch chain-containing diol chain segment. The preparation method comprises: carrying out an esterification reaction on terephthalic acid and a branch chain-containing diol under the catalysis of concentrated sulfuric acid to obtain terephthalic acid diol ester, carrying out an esterification reaction on terephthalic acid and ethylene glycol to obtain ethylene glycol terephthalate, carrying out stirring mixing on the terephthalic acid diol ester and the ethylene glycol terephthalate, carrying out a low vacuum stage condensation polymerization reaction and a high vacuum stage condensation polymerization reaction under the effects of a catalyst and a stabilizer to prepare a modified polyester, metering the modified polyester, extruding with a porous spinning plate, cooling, oiling, drawing, carrying out thermal shaping, and winding to prepare the high uniformity high modulus low shrinkage type polyester industrial yarn.

The invention relates to porous PTT (polytrimethylene terephthalate) fiber FDY (fully drawn yarn) and a preparation method thereof. The porous PTT fiber FDY is prepared from modified PTT through spinning by a porous spinneret plate; spinneret holes in the porous spinneret plate are arranged elliptically, that is, the centers of the spinneret holes are located on concentric ellipses which are a series of ellipses, major axes of the ellipses are collinear, and minor axes of the ellipses are collinear. The porous PTT fiber FDY is prepared from the modified PTT through processing; a preparation method of the modified PTT comprises the following steps: terephthalic acid and 1,3-propanediol react to prepare 1,3-propanediol terephthalate, terephthalic acid and diol containing branched chains are added for a reaction, diol terephthalate is prepared and continuously subjected to a reaction, and modified PTT is obtained. The prepared fiber has excellent performance, the linear density deviation is lower than or equal to 0.5%, the breaking strength CV value is lower than or equal to 4.0%, the breaking elongation CV value is lower than or equal to 8.0%, and the yarn unevenness CV is lower than or equal to 2.0.

The invention relates to soft wool-like porous polyester and a preparation method thereof. The soft wool-like porous polyester is prepared from modified polyester through spinning by a porous spinneret plate; spinneret holes in the porous spinneret plate are arranged elliptically, that is, the centers of the spinneret holes are located on concentric ellipses which are a series of ellipses, major axes of the ellipses are collinear, and minor axes of the ellipses are collinear. The soft wool-like porous polyester is prepared from modified polyester POY and modified polyester FDY through processing; a preparation method of the modified polyester comprises the following steps: terephthalic acid and ethylene glycol react to prepare ethylene terephthalate, terephthalic acid and propylene glycol containing branched chains are added for a reaction, glycol terephthalate is prepared and continuously subjected to a reaction, and modified polyester is obtained. The prepared fiber has excellent performance, the linear density deviation is lower than or equal to 2.0%, the breaking strength CV value is lower than or equal to 4.0%, the breaking elongation CV value is lower than or equal to 8.0%, and the crimp contraction variation coefficient CV value is lower than or equal to 8.0%.

The invention discloses a method for accelerating polyvinyl alcohol soluble microneedle forming and instant administration and a prepared microneedle. The invention firstly discloses the method for accelerating polyvinyl alcohol soluble microneedle forming and instant administration. The method comprises the step of combining at least one water-soluble divalent inorganic salt or hydrate thereof orsodium alginate with polyvinyl alcohol for use. The invention further provides the microneedle prepared by the method. When the polyvinyl alcohol soluble microneedle is prepared, at least one water-soluble divalent inorganic salt or hydrate thereof or sodium alginate is added into polyvinyl alcohol. The crystallinity of polyvinyl alcohol is reduced, and the structural regularity is destroyed. Theactivity of a polyvinyl alcohol chain segment is enhanced, so that the formation of the polyvinyl alcohol soluble microneedle is accelerated. Instant administration is realized, and the moisture-proof stability of the needle body is improved. Good microneedle substrate flexibility and needle tip mechanical strength are kept. In addition, the method is simple, rapid and convenient for large-scaleproduction, and widens the application of polyvinyl alcohol in the field of soluble microneedles.

The invention relates to high-uniformity, high-tenacity and low-elongation polyester industrial yarns and a preparation method thereof. Polyester fibers are prepared from modified polyester consisting of a terephthalic acid chain section, an ethylene glycol chain section and a branch-containing dihydric alcohol chain section. The preparation method of the high-uniformity, high-tenacity and low-elongation polyester industrial yarns comprises the following steps: performing esterification reaction on terephthalic acid and branch-containing dihydric alcohol under the catalysis of concentrated sulfuric acid to obtain phthalic acid dihydric alcohol ester; then matching the terephthalic acid and dihydric alcohol for esterification reaction to obtain terephthalate; finally, stirring and mixing the phthalic acid dihydric alcohol ester and the terephthalate, performing condensation polymerization in a low-vacuum stage and a high-vacuum stage under the action of a catalyst and a stabilizer to prepare modified polyester, and performing metering, extrusion by a multihole spinneret plate, cooling, oiling, drawing, thermal sizing and winding on the modified polyester to prepare the high-uniformity, high-tenacity and low-elongation polyester industrial yarns.

The invention relates to a porous super-soft linen-like polyester fiber and a preparation method thereof. Modified polyester is spun by a porous spinneret plate to prepare the porous super-soft linen-like polyester fiber. The spinneret orifices in the spinneret plate are arranged in an oval shape. The center of the spinneret orifices is positioned on the center of concentric ellipses; the concentric ellipses are a series of ellipses, long axes of all ellipses are collinear, and moreover, short axes of all ellipses are collinear. The porous super-soft linen-like polyester fiber is prepared from modified polyester POY yarns and modified polyester FDY yarns. The modified polyester preparation method comprises the following steps: reacting terephthalic acid with glycol to obtain ethylene glycol terephthalate, reacting ethylene glycol terephthalate with added branch chain containing hexylene glycol to generate dihydric alcohol terephthalate, and keeping on reactions to obtain modified polyester. The prepared fiber has excellent performances: the linear density deviation ratio is not more than 2.0%, the breaking strength CV value is not more than 4.0%, the breaking elongation CV value is not more than 8.0%, and the crimp contraction variable coefficient CV value is not more than 8.0%.

The invention relates to porous polyester fiber HOY filaments and a preparation method thereof; the porous polyester fiber HOY filaments are prepared by spinning modified polyester through a porous spinneret plate; an arrangement way of spinneret holes in the porous spinneret plate is in oval arrangement, that is to say, a hole center of the spinneret holes is located in concentric ellipses, the concentric ellipses are a series of ellipses, the long axes of all the ellipses are collinear, and the short axes are collinear. The porous polyester fiber HOY filaments are prepared by metering, extruding, cooling, oiling and high-speed coiling of the modified polyester, wherein a preparation method for the modified polyester comprises the steps: carrying out a reaction of terephthalic acid and ethylene glycol to prepare ethylene glycol terephthalate, adding terephthalic acid and branched chain-containing dihydric alcohol, carrying out a reaction to prepare dihydric alcohol terephthalate, and continuing to carry out a reaction to obtain the modified polyester. The prepared fiber is excellent in properties, the linear density deviation rate of the porous polyester fiber HOY filaments is less than or equal to 0.2%, the CV value of breaking strength is less than or equal to 2.5%, and the CV value of breaking elongation is less than or equal to 5.0%.

The invention relates to a porous superfine denier flat yarn and a preparation method thereof. Modified polyester is spun by a porous spinneret plate to prepare the porous superfine denier flat yarn; the arrangement form of spinneret holes in the porous spinneret plate is in an ellipse, namely that the hole center of each spinneret hole is positioned on concentric ellipses, the concentric ellipses are a series of ellipses, the long axes of all the ellipses are collinear, and the short axes of all the ellipses are collinear. The modified polyester is subjected to slicing, solid-phase polycondensation and viscosity increasing, so as to prepare the porous superfine denier flat yarn. A preparation method of the modified polyester comprises the following steps of reacting terephthalic acid and ethylene glycol to prepare ethylene terephthalate; adding ethylene terephthalate prepared by reaction of terephthalic acid and branch chain-containing ethylene glycol, and continuously reacting, so as to prepare the ethylene terephthalate; continuing to react, so as to obtain the modified polyester. The porous superfine denier flat yarn has the advantages that the prepared fiber property is excellent; the linear density deviation is smaller than or equal to 0.5%, a break strength CV (coefficient of variation) value is smaller than or equal to 4.0%, a break elongation CV value is smaller than or equal to 8.0%, and a yarn unevenness CV value is smaller than or equal to 2.0%.