CN113186654B

CN113186654B - Polyester melt-blown non-woven fabric and preparation method thereof

Info

Publication number: CN113186654B
Application number: CN202110450915.2A
Authority: CN
Inventors: 郑海明; 徐建明; 贾建东
Original assignee: Hangzhou Kebaite Technology Co ltd
Current assignee: Hangzhou Kebaite Technology Co ltd
Priority date: 2021-04-26
Filing date: 2021-04-26
Publication date: 2023-05-02
Anticipated expiration: 2041-04-26
Also published as: CN113186654A

Abstract

The invention relates to a polyester melt-blown non-woven fabric, which comprises fiber filaments stacked and bonded with each other, wherein the diameter of the fiber filaments is between 200nm and 10 mu m, the polyester melt-blown non-woven fabric contains 0.1% -2.0% of inhibitor, the interception efficiency of the polyester melt-blown non-woven fabric to particle impurities of 5 mu m and above is more than or equal to 90%, and the intrinsic viscosity of a fiber material of the polyester melt-blown non-woven fabric is between 0.5dL/g and 1.2 dL/g. The preparation method of the polyester melt-blown non-woven fabric further comprises the following steps: s1: mixing raw materials; s2: melt spinning; s3: and (5) receiving and forming. The invention aims to provide a polyester melt-blown non-woven fabric with smaller fiber diameter and higher strength.

Description

Polyester melt-blown non-woven fabric and preparation method thereof

Technical Field

The invention relates to a melt-blown non-woven fabric and a preparation method thereof, in particular to a polyester melt-blown non-woven fabric and a preparation method thereof.

Background

The melt-blown non-woven fabric is a non-woven material prepared by a melt-blown method process, and structurally, the melt-blown non-woven fabric has a plurality of gaps, is fluffy in structure, has superfine fibers with unique capillary structures, and increases the number and specific surface area of fibers per unit area, so that the melt-blown non-woven fabric has good filterability, shielding property, heat insulation property and oil absorption property. Can be used in the fields of air, liquid filtering materials, isolating materials, absorbing materials, mask materials, thermal insulation materials, oil absorption materials, wiping cloth and the like.

In the prior art, chinese patent CN104126034B discloses a "melt-blowing method, low shrinkage melt-blown polymer fibers and fiber structures, and melt-blown polymer compositions", in which it is mentioned that a fiber structure material is melt-blown from a combination of polyester polymer and auxiliary agent (metal hypophosphite), and the polyester nonwoven fabric prepared by the present invention has advantages of low shrinkage and good strength, but the diameter of the filter fiber reaches 6-10 μm, which can not meet the requirement of high filtration accuracy in nano-scale. The method is used for analyzing the reason that the diameter of the polyester melt-blown non-woven fabric cannot be thinned in the prior art: in the process of making a meltblown nonwoven, a polymer melt is ejected through an orifice to form filaments. Under the same external conditions, the viscosity and the fluidity of the melt play an important role in forming the fiber yarn, and the melt with low fluidity is more unfavorable for forming the fiber with smaller diameter, so that the conventional solution is to improve the fluidity of the polymer melt to enable the fiber with smaller diameter to be formed, and the main means for improving the fluidity of the melt is to improve the temperature, so that the movement of a molecular chain is accelerated, and the fluidity of the melt can be obviously improved. However, since the polyester material is sensitive to temperature, the degradation temperature (280-290 ℃) is only slightly higher than the processing temperature (240-280 ℃), if the melt temperature of the polyester material is increased, the degradation phenomenon is easy to occur, so that the melt is easy to yellow and discolor, the melt viscosity is unstable, the degraded melt is thinner, the undegraded melt is thicker, the melt is unevenly distributed, and the non-woven fabric formed by melt blowing is uneven in performance. And the degraded part of the melt has low strength of the formed fiber, and is easier to break, so that fly is generated. Therefore, the polyester melt-blown nonwoven fabric with a smaller diameter cannot be obtained by the conventional method.

Disclosure of Invention

The invention aims to provide a polyester melt-blown non-woven fabric with finer fiber diameter and higher strength.

In order to achieve the above purpose, the invention adopts the following technical scheme: a polyester meltblown nonwoven fabric comprising filaments stacked and bonded to one another, characterized in that: the diameter of the fiber filaments is between 200nm and 10 mu m, the polyester melt-blown non-woven fabric contains 0.1% -3.0% of inhibitor, the interception efficiency of the polyester melt-blown non-woven fabric to 5 mu m and above particle impurities is more than or equal to 90%, and the intrinsic viscosity of the fiber material of the polyester melt-blown non-woven fabric is between 0.5dL/g and 1.2 dL/g.

Through adopting above-mentioned technical scheme, guaranteed that polyester melt-blown non-woven fabrics's cellosilk can reach the diameter of nanometer level, can let whole polyester non-woven fabrics's filtration precision reach higher precision, can make polyester melt-blown non-woven fabrics be applied to the more harsh operational aspect of filtration requirement. By adding the inhibitor, the generation of free radicals is inhibited, so that the thermal oxidative degradation of the polyester raw material is inhibited, and the high-precision polyester melt-blown non-woven fabric is ensured to be shaped smoothly.

Further, the inhibitor is one or more of hindered phenol antioxidants and/or phosphite antioxidants and/or organic sulfur antioxidants.

By adopting the technical scheme, the types of the inhibitors are limited, and the selection of the inhibitors is realized by combining the consideration of various factors such as the performance, the price and the like of specific materials.

Further, the breaking force of the polyester melt-blown non-woven fabric in the longitudinal direction is set between 3N and 90N, and the breaking elongation in the longitudinal direction is set between 1% and 30%.

Further, the transverse breaking strength of the polyester melt-blown non-woven fabric is set between 3N and 60N, and the transverse breaking elongation is set between 3% and 50%.

Further, the ratio of the transverse breaking strength to the longitudinal breaking strength of the polyester melt-blown nonwoven fabric is set between 0.2 and 1; the ratio of the elongation at break in the transverse direction to the elongation at break in the longitudinal direction is set between 1 and 15.

By adopting the technical scheme, the relative relation between the breaking strength and the breaking elongation of the polyester melt-blown non-woven fabric in the transverse direction and the longitudinal direction is limited, the values of the breaking strength and the breaking elongation of the polyester melt-blown non-woven fabric are limited, and the advantages of the polyester melt-blown non-woven fabric in the strength aspect are reflected from the values. The transverse direction is the width direction, and the longitudinal direction is the rolling or film-feeding direction. The polyester melt-blown non-woven fabric has better longitudinal strength, so that the polyester melt-blown non-woven fabric is not easy to break in the production process of winding or coiling the polyester melt-blown non-woven fabric into a filter element.

Further, the fiber yarn comprises fine fiber yarn with the diameter of 200nm-1000nm and coarse fiber yarn with the diameter of 1 μm-10 μm, wherein the mass proportion of the fine fiber yarn is between 30% and 70%, and the mass proportion of the coarse fiber yarn is between 30% and 70%.

Through adopting above-mentioned technical scheme, to polyester melt-blown non-woven fabrics, relatively thicker cellosilk can provide higher supporting strength, has played the effect of skeleton, and relatively finer cellosilk can guarantee the high accuracy of polyester melt-blown non-woven fabrics, through the mass proportion limit of thick fibre and fine fibre, has guaranteed that polyester melt-blown non-woven fabrics has certain intensity simultaneously, guarantees certain ventilation volume, filtration precision and receives dirty volume again.

Further, the standard deviation of the fiber diameter is set between 0.1 μm and 1.2 μm.

By adopting the technical scheme, the standard deviation of the fiber diameter is limited, and the fact that the thickness of the fiber is relatively uniform is indicated, and the situation that the thickness of the single fiber is greatly different is avoided. The fiber yarn with uniform thickness ensures that the integral polyester melt-blown non-woven fabric has relatively uniform performance distribution.

Further, the gram weight of the polyester melt-blown non-woven fabric is set between 20 g/square meter and 200 g/square meter, and the air permeability is set between 20mm/s and 500 mm/s.

By adopting the technical scheme, the gram weight and air permeability range of the polyester melt-blown non-woven fabric are limited, so that the polyester melt-blown non-woven fabric can correspondingly meet different application scenes.

Further, the hindered phenolic antioxidants include, but are not limited to, pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], stearyl 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, 1,3, 5-trimethyl-2, 4, 6-tris (3, 5-di-tert-butyl-4-hydroxybenzyl) benzene; the phosphite antioxidants include, but are not limited to, tris (2, 4-di-tert-butylphenyl) phosphite, bis (2, 4-di-tert-butylphenyl) pentaerythritol diphosphite, (2, 4, 6-tri-tert-butylphenyl-2-butyl-2-ethyl) -1, 3-propanediol phosphite; the organic sulfur antioxidant includes but is not limited to pentaerythritol dodecyl thio propyl ester and dioctadecyl thiodipropionate.

By adopting the technical scheme, the specific components of the hindered phenol antioxidant, the phosphite antioxidant and the organic sulfur antioxidant are more specifically disclosed, and the inhibitor is ensured to have a better effect of inhibiting the thermal degradation of polyester.

The invention also discloses a preparation method of the polyester melt-blown non-woven fabric, which comprises the following steps: s1: mixing raw materials, and uniformly mixing a polyester raw material with the mass content of 97% -99.9% and an inhibitor with the mass content of 0.1% -3.0%; s2: melt spinning, namely, carrying out melt extrusion on the blend obtained in the step S1 in an extruder, then carrying out metering by a metering pump and traction by an air knife, and carrying out melt blowing by a spinneret plate to form fiber filaments with the diameter of 200nm-10 mu m, wherein the intrinsic viscosity of the polyester raw material is set to be 0.5dL/g-1.2 dL/g; s3: and (3) receiving and forming, interweaving and bonding the fiber filaments sprayed out in the step (S2) on a winding net curtain to form melt-blown non-woven fabrics, and cooling and forming through a cooling device.

The conventional process for preparing polyester meltblown nonwoven without added inhibitors involves two processes when thermal degradation occurs. 1. Chain initiation (the stage of free radical generation after heating of the polymer). Namely RH (polymeric material) →R+H. 2. Chain transfer and chain growth (free radicals undergo oxidation reaction under the action of heat and oxygen, so that macromolecular chains undergo breakage, degradation and discoloration, generally yellowing). That is, the free radical R.generated in the chain initiation step reacts with oxygen to produce ROO.i.e., R.cndot. +O2.cndot.ROO; ROO.the hydrogen on the polymer can be abstracted to generate hydroperoxide ROOH, namely ROO+RH→ROOH+R; then ROOH is decomposed into RO and OH, namely ROOH→RO·+ & OH; simultaneously, ROOH can be combined with RH to react to generate RO, R and H2O, namely ROOH+RH- & RO+R+H2O; and two ROOH can also be decomposed into RO, ROO and H2O, namely 2ROOH→RO+ROO+H2O. Finally, a thermal degradation circulation process is formed, after the inhibitor is added into the raw materials, the inhibitor can react with free radicals (mainly R.and ROO.and RO.) generated by thermal degradation of the materials to generate stable products, and the growth of active chains is interrupted, so that the thermal oxidative aging chain is stopped, and the thermal degradation condition is slowed down. On the other hand, the inhibitor can also reduce ROOH generated by thermal degradation into stable alcohols, and prevent further degradation to generate active free radicals. Therefore, the polyester melt-blown non-woven fabric prepared by the scheme in the application can not cause the product performance deterioration due to the thermal degradation of the polyester raw material, and can not generate the conditions that fiber filaments are easily broken to generate fly and even the filaments cannot be made.

Further, the raw materials are subjected to primary melt mixing in an extruder and then subjected to secondary melt mixing in a static disperser.

Through adopting above-mentioned technical scheme, having carried out twice melt mixing to the raw materials, can fully with polyester melt and inhibitor misce bene, and guaranteed that the melt is evenly stable in the runner distributes, can let the spun cellosilk texture in the S2 melt spinning step even to the performance is even stable in horizontal and longitudinal direction of the melt-blown non-woven fabrics that makes formation.

Further, the temperature of the primary melt mixing is set between 230 ℃ and 300 ℃, and the temperature of the secondary melt mixing is set between 250 ℃ and 300 ℃.

By adopting the technical scheme, the two melting mixing temperatures are respectively controlled, and the excessively low melting mixing temperature can lead the fluidity of the raw materials to be lower, which is not beneficial to the melting mixing of the raw materials; and the excessive temperature can cause more serious thermal degradation of the polyester raw material, thereby affecting the product quality.

Further, the inhibitor in the step S1 is one or more of hindered phenol and/or phosphite and/or organic sulfur.

By adopting the technical scheme, specific types and specific components of the inhibitor are limited, for the hindered phenol inhibitor, active hydrogen atoms are provided for alkoxy free radicals RO, carbon free radicals R and peroxy free radicals ROO, the phenol free radicals ArO (or aryloxy free radicals) generated in the reaction are in a stable resonance state, and the reaction activity is extremely low. ArO.can react with the peroxy radical ROO.to form a stabilizer, i.e., arO.times.+ ROO.times..fwdarw.RO 2ArO. At the same time, the benzyl carbon atom of the phenol compound has a second hydrogen atom which can be taken off to generate a free radical, is relatively stable and has the capability of further capturing the free radical. In the case of phosphite inhibitors, the peroxide produced by thermal oxidation of the polymer is decomposed to deactivate the reactivity thereof, thereby reducing the number of radicals produced by decomposition of the peroxide. Peroxide can initiate new free radicals in the degradation process that induce the decomposition process, thus preventing this reaction of peroxide can lead to a dramatic decrease in polymer degradation. The mechanism is as follows: the phosphite ester and the hydroperoxide undergo oxidation-reduction reaction to generate organic phosphates and alcohols of another valence state of phosphorus. In the case of the thioester inhibitors, the action of decomposing the hydroperoxide in the polymer is similar to that of the phosphite. The active sulfur atoms on the thioether molecules can be rapidly oxidized by the peroxide, so that the reactivity of the thioether molecules is deactivated, and the number of free radicals generated by the decomposition of the peroxide is reduced. Thus preventing this reaction of peroxide can lead to a drastic decrease in polymer degradation. The reaction mechanism is as follows: the active sulfur atoms undergo redox reactions with the hydroperoxide to form an organic species of another valence of sulfur (the reaction product of the oxidation of the thioester/ether inhibitor), and alcohols (the reaction product of the reduction of the hydroperoxide).

Further, the polyester raw material comprises a polyester raw material with an intrinsic viscosity; or the polyester raw material comprises two or more than two kinds of intrinsic viscosity polyester raw materials.

Further, the polyester raw materials include, but are not limited to, polybutylene terephthalate, polyethylene terephthalate, and polypropylene terephthalate.

By adopting the technical scheme, the intrinsic viscosity of the polyester raw material and the specific types of the polyester raw material are limited, the intrinsic viscosity of the polyester raw material is different, the fiber filaments with different fiber diameters can be produced, the relatively thick and thin fiber filaments in the finished product of the polyester melt-blown non-woven fabric are ensured, the polyester melt-blown non-woven fabric can have certain strength, and good air permeability and filtering precision can be ensured.

Further, the length of the spinneret plate in the step S2 is 1000mm-1400mm, the number of the spinneret holes is 2500-3200, the aperture of the spinneret holes is 0.1mm-0.5mm, the hole spacing is 0.3mm-1.0mm, and the length-diameter ratio of the spinneret holes is 15-30.

Further, the temperature of the spinneret plate in the step S2 is 240-320 ℃, and the flow rate of the melted blend in the spinneret plate is 0.03-0.5 ghm.

Through adopting above-mentioned technical scheme, specifically limited the relevant setting of spinneret and spinneret orifice, can guarantee that polyester raw materials can melt-blown into the silk smoothly, can guarantee higher wire-forming efficiency again, production efficiency promptly.

Further, the temperature of the melt-blown non-woven fabric in the step S3 is set between 80 ℃ and 200 ℃.

By adopting the technical scheme, the forming temperature of the melt-blown non-woven fabric is limited, wherein the forming temperature specifically refers to the temperature when the polyester raw material is sprayed out through the spinneret orifices to form fiber filaments and then interweaved and bonded on the winding net curtain to form the melt-blown non-woven fabric. If the molding temperature is too low, the fiber filaments cool too quickly in the molding process, so that bonding points between the fiber filaments are very few or the bonding force of the bonding points is too low, and the polyester melt-blown non-woven fabric is easy to scatter and has low strength; if the molding temperature is too high, the fiber yarn is not cooled in the molding process, the fiber yarn doubling phenomenon is serious, even the fiber yarn on the surface of the product can be coalesced into a block-shaped and sheet-shaped structure, the air permeability and the void ratio of the polyester melt-blown non-woven fabric are affected, and the product performance is reduced.

Further, the hot air volume of the air knife in the step S2 is set at 20m ³ /min-60m ³ And the temperature of the hot air is set between 240 ℃ and 330 ℃, the interval between the air knife and the forming position of the melt-blown non-woven fabric is set between 50mm and 200mm, the air knives are arranged on two sides of the spinneret hole, and the interval between the inclined plane of the air knife and the inclined plane of the spinneret plate is set between 0.5mm and 1.6 mm.

By adopting the technical scheme, the air knives are subjected to relevant parameter settings, and the settings can ensure that the temperature of the fiber filaments is between 80 and 200 ℃ when the fiber filaments are formed on the winding net curtain, so that the polyester melt-blown non-woven fabric has enough bonding points between the fiber filaments when the fiber filaments are formed, and the fiber filaments cannot get too late to cool to cause the fiber filaments to agglomerate. The temperature of the hot air here refers in particular to the temperature of the hot air stream before the outlet of the air knife.

Further, the included angle of the V-shaped inclined plane formed by the air knives at the two sides of the spinneret hole is set between 60 degrees and 90 degrees.

By adopting the technical scheme, the included angle range of the air knife is limited, and the included angle range of the blowing direction of the air knife and the direction of the fiber filaments sprayed out of the spinneret orifice is also limited. If the included angle is smaller, the blowing direction tends to be parallel to the fiber spraying direction, so that a better gathering effect cannot be achieved on the fiber sprayed through the spinneret orifices, and the fiber is very dispersed when sprayed to a winding net curtain, so that the fiber is difficult to form; if the included angle is larger, the blowing direction tends to be perpendicular to the fiber yarn spraying direction, which is unfavorable for the traction and stretching of hot air on the fiber yarn in the spraying direction.

Further, the weight average molecular weight of the polyester raw material in the step S1 is selected to be 20000-60000.

By adopting the technical scheme, the weight average molecular weight of the polyester raw material is limited, if the molecular weight of the raw material is too large, the viscosity of the raw material is very high when the raw material is molten, the fluidity is poor, and the raw material is not easy to be sprayed out from a spinneret orifice to form thinner fiber yarns; if the molecular weight of the raw material is too small, thermal degradation is relatively more likely to occur during melt mixing of the raw material, and the filaments formed by melt blowing are lower in strength and more likely to break, resulting in fly.

Further, the step S1 further includes a step S0: the polyester raw material is dried.

Through adopting above-mentioned technical scheme, drying the polyester raw materials can guarantee the dryness of polyester raw materials, if contain moisture content in the polyester raw materials, then take place thermal degradation more easily in the melt mixing's in-process, lead to the easy broken silk when forming the cellosilk, form fly, colour yellowing etc. influences the quality of melt-blown non-woven fabrics.

Compared with the prior art, the polyester melt-blown non-woven fabric has the advantages that 1, the polyester melt-blown non-woven fabric with finer fiber diameter and higher filtering precision can be prepared. 2. The strength of the fiber yarn is higher, and the yarn is not easy to break.

Compared with the prior art, the preparation method of the polyester melt-blown non-woven fabric has the advantages that 1, more fly is not generated in the preparation process of the polyester melt-blown non-woven fabric, and the health of operators is affected. 2. Can efficiently produce the polyester melt-blown non-woven fabric with finer fiber diameter.

Detailed Description

The present invention will be described in further detail below in order to more clearly understand the above objects, features and advantages of the present invention. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.

Embodiment one:

a process for preparing the melt-blown non-woven polyester fabric features that the polybutylene terephthalate with intrinsic viscosity of 0.53dL/g and weight-average molecular weight of 25000 is used as raw polyester material. The method includes a step S0 of drying the polybutylene terephthalate, and sufficiently discharging water in the polybutylene terephthalate by using a dehumidifying and drying mode. Step S1, mixing raw materials, namely, polybutylene terephthalate with the mass content of 99 percent and [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid with the mass content of 1 percent ]Pentaerythritol esters were mixed homogeneously. In step S1, polybutylene terephthalate and [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid are first reacted]The pentaerythritol ester was initially melt-mixed in an extruder at a heating temperature of 240 ℃, 250 ℃, 260 ℃, 270 ℃ and 280 ℃ in that order along the traveling direction. After the mixed materials are extruded from the extruder, the mixed materials enter a static mixer at 280 ℃ for secondary melting and mixing, so that the materials are uniformly mixed. And S2, melt spinning, namely, melt extruding the blend obtained in the step S1 in an extruder, and drawing by a metering pump and an air knife to form fiber filaments with the diameter of 200nm-10 mu m. In this step, the length of the spinneret plate was 1200mm, the number of the spinneret holes was 2500, and each spinneret plate was usedThe diameter of the holes was 0.15mm, the pitch of each hole was 0.3mm, the aspect ratio of the hole was 15, and the temperature of the spinneret was set to 285℃and the flow rate of the molten blend in the spinneret was 0.1ghm. The two sides of the spinneret plate are provided with air knives, and the hot air volume of the air knives is 21m ³ And/min, the temperature of hot air is set to 300 ℃, the interval between the air knife and the forming position of the melt-blown non-woven fabric is set to 50mm (namely, the interval between the air knife and a winding net curtain), the interval between the inclined plane of the air knife and the inclined plane of a spinneret plate is 0.7mm, and meanwhile, the included angle of the V-shaped inclined plane formed by the air knives on the two sides of the spinneret plate is 60 degrees. And S3, stacking and bonding the fiber filaments sprayed out of the spinneret holes at the winding net curtain to form the melt-blown non-woven fabric, wherein the temperature between the spinneret plate and the winding net curtain is 180 ℃, namely the forming temperature of the polyester melt-blown non-woven fabric. After the fiber filaments form melt-blown non-woven fabrics at the winding net curtain, the melt-blown non-woven fabrics are cooled by a constant-temperature spraying system, the temperature of the constant-temperature spraying system is set to be 19 ℃, the spraying flow is 200ml/min, and the spraying pressure is 0.2MPa.

The polybutylene terephthalate melt-blown nonwoven fabric prepared by the method has the surface fiber diameter of 200nm-10 mu m, and contains 1% of inhibitor in the nonwoven fabric, and the intrinsic viscosity of the fiber material of the polyester melt-blown nonwoven fabric is 0.53L/g. The product is measured for transverse breaking strength and longitudinal breaking elongation, so that the non-woven fabric is 9N in transverse breaking strength, 15N in longitudinal breaking strength, 3% in transverse breaking elongation and 2.5% in longitudinal breaking elongation. And simultaneously, the diameter distribution of the fiber filaments is measured, the mass ratio of the fine fiber filaments with the diameters of 200nm-1000nm is 70%, the mass ratio of the coarse fiber filaments with the diameters of 1-10 mu m is 30%, the standard deviation of the fiber filament diameters is 0.3 mu m, the gram weight of the whole polybutylene terephthalate melt-blown non-woven fabric is 60 g/square meter, and the air permeability is 22mm/s. Further, the nonwoven fabric of example one was selected to be a single-layer disc with a diameter of 47mm, and the particulate impurities of 5 μm or more were filtered in water at 5kPa and 20℃with an interception efficiency of 98%.

Embodiment two:

polyester melt-blown non-woven fabricPolybutylene terephthalate with an intrinsic viscosity of 0.7dL/g and a weight average molecular weight of 30000 was selected as the polyester raw material. The method includes a step S0 of drying the polybutylene terephthalate, and sufficiently discharging water in the polybutylene terephthalate by using a dehumidifying and drying mode. Step S1, mixing raw materials, namely, 98.5 percent of polybutylene terephthalate and 1.5 percent of [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid by mass ]Pentaerythritol esters were mixed homogeneously. In step S1, polybutylene terephthalate and [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid are first reacted]The pentaerythritol ester was initially melt-mixed in an extruder at a heating temperature of 240 ℃, 250 ℃, 260 ℃, 270 ℃ and 280 ℃ in that order along the traveling direction. After the mixed materials are extruded from the extruder, the mixed materials enter a static mixer at 280 ℃ for secondary melting and mixing, so that the materials are uniformly mixed. And S2, melt spinning, namely, melt extruding the blend obtained in the step S1 in an extruder, and drawing by a metering pump and an air knife to form fiber filaments with the diameter of 200nm-10 mu m. In this step, the length of the spinneret plate was 1200mm, the number of the spinneret holes was 2600, the diameter of each spinneret hole was 0.25mm, the pitch of each spinneret hole was 0.4mm, the aspect ratio of the spinneret hole was 17, and the temperature of the spinneret plate was set to 280℃and the flow rate of the molten blend in the spinneret plate was 0.08ghm. The two sides of the spinneret plate are provided with air knives, and the hot air volume of the air knives is 30m ³ And/min, the temperature of hot air is set to 300 ℃, the interval between the air knife and the forming position of the melt-blown non-woven fabric is set to 70mm (namely, the interval between the air knife and a winding net curtain), the interval between the inclined plane of the air knife and the inclined plane of a spinneret plate is 0.6mm, and meanwhile, the included angle of the V-shaped inclined plane formed by the air knives on the two sides of the spinneret plate is 70 degrees. And S3, stacking and bonding the fiber filaments sprayed out of the spinneret holes at the winding net curtain to form the melt-blown non-woven fabric, wherein the temperature between the spinneret plate and the winding net curtain is 150 ℃, namely the forming temperature of the polyester melt-blown non-woven fabric. After the fiber filaments form melt-blown non-woven fabrics at the winding net curtain, the melt-blown non-woven fabrics are cooled by a constant-temperature spraying system, the temperature of the constant-temperature spraying system is set to be 19 ℃, the spraying flow is 300ml/min, and the spraying pressure is 0.3MPa.

The polybutylene terephthalate melt-blown nonwoven fabric prepared by the method has the surface fiber diameter of 200nm-10 mu m, and contains 1.5% of inhibitor in the nonwoven fabric, and the intrinsic viscosity of the fiber material of the polyester melt-blown nonwoven fabric is 0.7dL/g. The product is measured for the transverse breaking strength and the longitudinal breaking elongation, so that the non-woven fabric is 19.5N in transverse breaking strength, 18N in longitudinal breaking strength, 25.8% in transverse breaking elongation and 4.6% in longitudinal breaking elongation. And meanwhile, the diameter distribution of the fiber filaments is measured, the mass ratio of the fine fiber filaments with the diameters of 200nm-1000nm is 64%, the mass ratio of the coarse fiber filaments with the diameters of 1-10 mu m is 36%, the standard deviation of the fiber filament diameters is 0.4 mu m, the gram weight of the whole polybutylene terephthalate melt-blown non-woven fabric is 60 g/square meter, and the air permeability is 130mm/s. Further, the nonwoven fabric of example two was selected to be a single-layer disc with a diameter of 47mm, and the particulate impurities of 5 μm or more were filtered in water at 5kPa and 20℃with an interception efficiency of 95%.

Embodiment III:

a process for preparing the melt-blown non-woven polyester cloth features that the polyethylene terephthalate with intrinsic viscosity (0.96 dL/g) and weight-average molecular weight (34000) is used as raw polyester material. The method comprises a step S0 of drying the polybutylene terephthalate, and fully discharging the water in the polyethylene terephthalate by using a dehumidifying and drying mode. Step S1, mixing raw materials, and uniformly mixing 98.5% of polyethylene terephthalate and 1.5% of octadecyl 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate. In the step S1, firstly, polyethylene terephthalate and 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate are subjected to preliminary melt mixing in an extruder, and the heating temperature of the extruder is 240 ℃, 250 ℃, 260 ℃, 270 ℃ and 280 ℃ in sequence along the advancing direction. After the mixed materials are extruded from the extruder, the mixed materials enter a static mixer at 280 ℃ for secondary melting and mixing, so that the materials are uniformly mixed. Step S2, melt spinning, wherein the blend obtained in the step S1 is melt extruded in an extruder and then subjected to the following steps of Metering by a metering pump and drawing by an air knife to form fiber filaments with the diameter of 200nm-10 mu m. In this step, the length of the spinneret plate was 1200mm, the number of the spinneret holes was 2700, the diameter of each spinneret hole was 0.35mm, the pitch of each spinneret hole was 0.5mm, the aspect ratio of the spinneret hole was 19, and the temperature of the spinneret plate was set to 280℃and the flow rate of the molten blend in the spinneret plate was 0.07ghm. The two sides of the spinneret plate are provided with air knives, and the hot air volume of the air knives is 36m ³ The temperature of hot air is set to 280 ℃, the interval between the air knife and the forming position of the melt-blown non-woven fabric is set to 90mm (namely, the interval between the air knife and a winding net curtain), the interval between the inclined plane of the air knife and the inclined plane of a spinneret plate is 0.7mm, and meanwhile, the included angle of the V-shaped inclined plane formed by the air knives on the two sides of the spinneret plate is 80 degrees. And S3, stacking and bonding the fiber filaments sprayed out of the spinneret holes at the winding net curtain to form the melt-blown non-woven fabric, wherein the temperature between the spinneret plate and the winding net curtain is 130 ℃, namely the forming temperature of the polyester melt-blown non-woven fabric. After the fiber filaments form melt-blown non-woven fabrics at the winding net curtain, the melt-blown non-woven fabrics are cooled by a constant-temperature spraying system, the temperature of the constant-temperature spraying system is set to be 19 ℃, the spraying flow is 300ml/min, and the spraying pressure is 0.3MPa.

The polyethylene terephthalate melt-blown nonwoven fabric prepared by the method has the surface fiber diameter of 200nm-10 mu m, and contains 1.5% of inhibitor in the nonwoven fabric, and the intrinsic viscosity of the fiber material of the polyester melt-blown nonwoven fabric is 0.96dL/g. The product is measured for the transverse breaking strength and the longitudinal breaking elongation, so that the non-woven fabric is obtained, the transverse breaking strength is 22N, the longitudinal breaking strength is 36N, the transverse breaking elongation is 27.4%, and the longitudinal breaking elongation is 12.3%. And simultaneously, the diameter distribution of the fiber filaments is measured, the mass ratio of the fine fiber filaments with the diameter of 200nm-1000nm is 61%, the mass ratio of the coarse fiber filaments with the diameter of 1 mu m-10 mu m is 39%, the standard deviation of the fiber filament diameters is 0.5 mu m, the gram weight of the integral polyethylene terephthalate melt-blown non-woven fabric is 63 g/square meter, and the air permeability is 165mm/s. Further, the nonwoven fabric of example three was selected to be a single-layer, 47mm diameter disc, and the particulate impurities of 5 μm or more were filtered in water at 5kPa and 20℃with an interception efficiency of 94%.

Embodiment four:

a process for preparing the melt-blown non-woven polyester fabric features that the polytrimethylene terephthalate with intrinsic viscosity (1.1 dL/g) and weight-average molecular weight (41000) is chosen as raw polyester material. Comprises a step S0 of drying the polytrimethylene terephthalate, and fully discharging the water in the polytrimethylene terephthalate by using a low-temperature drying and blowing mode. Step S1, mixing raw materials, and uniformly mixing the polytrimethylene terephthalate with the mass content of 99% and the tri (2, 4-di-tert-butylphenyl) phosphite with the mass content of 1%. In the step S1, firstly, the polytrimethylene terephthalate and the tri (2, 4-di-tert-butylphenyl) phosphite ester are subjected to primary melt mixing in an extruder at 260 ℃, and when the mixed material is extruded from the extruder, the mixed material enters a static mixer at 260 ℃ for secondary melt mixing, so that the materials are uniformly mixed. And S2, melt spinning, namely, melt extruding the blend obtained in the step S1 in an extruder, and drawing by a metering pump and an air knife to form fiber filaments with the diameter of 200nm-10 mu m. In this step, the length of the spinneret plate was 1200mm, the number of the spinneret holes was 2800, the diameter of each spinneret hole was 0.4mm, the pitch of each spinneret hole was 0.6mm, the aspect ratio of the spinneret hole was 21, and the temperature of the spinneret plate was set to 270 ℃, and the flow rate of the molten blend in the spinneret plate was 0.2ghm. The two sides of the spinneret plate are provided with air knives, and the hot air volume of the air knives is 42m ³ The temperature of hot air is set to 270 ℃, the interval between the air knife and the forming position of melt-blown non-woven fabric is set to 110mm (namely, the interval between the air knife and a winding net curtain), the interval between the inclined plane of the air knife and the inclined plane of a spinneret plate is 0.8mm, and meanwhile, the included angle of the V-shaped inclined plane formed by the air knives on the two sides of the spinneret plate is 90 degrees. And S3, stacking and bonding the fiber filaments sprayed out of the spinneret orifices at the position of the winding net curtain to form the melt-blown non-woven fabric, wherein the temperature at the position of the winding net curtain is 120 ℃, namely the forming temperature of the polyester melt-blown non-woven fabric. After the fiber filaments form melt-blown non-woven fabrics at the winding net curtain, the melt-blown non-woven fabrics are cooled by a constant-temperature spraying system, the temperature of the constant-temperature spraying system is set to be 19 ℃, and the spraying flow is 300ml ∈min, the spraying pressure is 0.3MPa.

The polypropylene terephthalate melt-blown nonwoven fabric prepared by the method has the surface fiber diameter of 200nm-10 μm, the filtering precision of 7 μm, and the nonwoven fabric contains 1% of inhibitor, and the intrinsic viscosity of the fiber material of the polyester melt-blown nonwoven fabric is 1.1L/g. The product is measured for the transverse breaking strength and the longitudinal breaking elongation, so that the non-woven fabric is obtained, the transverse breaking strength is 23N, the longitudinal breaking strength is 20.3N, the transverse breaking elongation is 23%, and the longitudinal breaking elongation is 10.9%. And meanwhile, the diameter distribution of the fiber filaments is measured, the mass ratio of the fine fiber filaments with the diameters of 200nm-1000nm is 54%, the mass ratio of the coarse fiber filaments with the diameters of 1-10 mu m is 46%, the standard deviation of the fiber filament diameters is 0.6 mu m, the gram weight of the integral polytrimethylene terephthalate melt-blown non-woven fabric is 78 g/square meter, and the air permeability is 187mm/s. Further, the nonwoven fabric of example four was selected to be a single-layer, 47mm diameter disc, and the particulate impurities of 5 μm or more were filtered in water at 5kPa and 20℃with an interception efficiency of 94%.

Fifth embodiment:

a process for preparing the melt-blown non-woven polyester fabric features that the polytrimethylene terephthalate with intrinsic viscosity (1.2 dL/g) and weight-average molecular weight (53000) is chosen as raw polyester material. Comprises a step S0 of drying the polytrimethylene terephthalate, and fully discharging the water in the polytrimethylene terephthalate by using a low-temperature drying and blowing mode. Step S1, mixing raw materials, and uniformly mixing 99.5% of polytrimethylene terephthalate and 0.5% of pentaerythritol dodecyl thiopropyl ester. In the step S1, firstly, the polytrimethylene terephthalate and pentaerythritol dodecyl thiopropyl ester are subjected to primary melt mixing in an extruder at 270 ℃, and when the mixed material is extruded from the extruder, the mixed material enters a static mixer at 270 ℃ for secondary melt mixing, so that the materials are uniformly mixed. Step S2, melt spinning, namely melt extruding the blend obtained in the step S1 in an extruder, and drawing by a metering pump and an air knife to form a fiber between 200nm and 10 mu mAnd (5) a silk thread. In this step, the length of the spinneret plate was 1300mm, the number of the spinneret holes was 2900, the diameter of each spinneret hole was 0.5mm, the pitch of each spinneret hole was 0.7mm, the aspect ratio of the spinneret hole was 23, and the temperature of the spinneret plate was set to 280℃and the flow rate of the molten blend in the spinneret plate was 0.3ghm. The two sides of the spinneret plate are provided with air knives, and the hot air volume of the air knives is 47m ³ The temperature of hot air is set to 280 ℃, the interval between the air knife and the forming position of melt-blown non-woven fabric is set to 130mm (namely, the interval between the air knife and a winding net curtain), the interval between the inclined plane of the air knife and the inclined plane of a spinneret plate is 0.9mm, and meanwhile, the included angle of the V-shaped inclined plane formed by the air knives on the two sides of the spinneret plate is 90 degrees. And S3, stacking and bonding the fiber filaments sprayed out of the spinneret orifices at the winding curtain to form the melt-blown non-woven fabric, wherein the temperature at the winding curtain is 100 ℃, namely the forming temperature of the polyester melt-blown non-woven fabric. After the fiber filaments form melt-blown non-woven fabrics at the winding net curtain, the melt-blown non-woven fabrics are cooled by a constant-temperature spraying system, the temperature of the constant-temperature spraying system is set to be 19 ℃, the spraying flow is 300ml/min, and the spraying pressure is 0.3MPa.

The polypropylene terephthalate melt-blown nonwoven fabric prepared by the method has the surface fiber diameter of 200nm-10 mu m, the filtering precision of 9 mu m, 0.5% of inhibitor is contained in the nonwoven fabric, and the intrinsic viscosity of the fiber material of the polyester melt-blown nonwoven fabric is 1.2L/g. The product is measured for the transverse breaking strength and the longitudinal breaking elongation, so that the non-woven fabric is 42N in the transverse breaking strength, 22N in the longitudinal breaking strength, 33% in the transverse breaking elongation and 16% in the longitudinal breaking elongation. And meanwhile, the diameter distribution of the fiber filaments is measured, the mass ratio of the fine fiber filaments with the diameters of 200nm-1000nm is 49%, the mass ratio of the coarse fiber filaments with the diameters of 1-10 mu m is 51%, the standard deviation of the fiber filament diameters is 0.7 mu m, the gram weight of the integral polytrimethylene terephthalate melt-blown non-woven fabric is 102 g/square meter, and the air permeability is 228mm/s. Further, the nonwoven fabric of example five was selected to be a single-layer disc with a diameter of 47mm, and the particulate impurities of 5 μm or more were filtered in water at 5kPa and 20℃with an interception efficiency of 97%.

Example six:

a process for preparing the melt-blown non-woven polyester fabric features that the polybutylene terephthalate with intrinsic viscosity of 0.6dL/g and weight-average molecular weight of 23000 is chosen as raw polyester material. The method comprises the step S0 of drying the polybutylene terephthalate, and fully discharging the water in the polybutylene terephthalate by using a low-temperature drying and blowing mode. Step S1, mixing raw materials, and uniformly mixing polybutylene terephthalate with the mass content of 99.9% and bis (2, 4-di-tert-butylphenyl) pentaerythritol diphosphite with the mass content of 0.1%. In the step S1, firstly, the polybutylene terephthalate and the bis (2, 4-di-tert-butylphenyl) pentaerythritol diphosphite are subjected to primary melt mixing in an extruder at 280 ℃, and when the mixed material is extruded from the extruder, the mixed material enters a static mixer at 280 ℃ for secondary melt mixing, so that the materials are uniformly mixed. And S2, melt spinning, namely, melt extruding the blend obtained in the step S1 in an extruder, and drawing by a metering pump and an air knife to form fiber filaments with the diameter of 200nm-10 mu m. In this step, the length of the spinneret plate was 1400mm, the number of the spinneret holes was 3000, the diameter of each spinneret hole was 0.5mm, the pitch of each spinneret hole was 0.8mm, the aspect ratio of the spinneret hole was 27, and the temperature of the spinneret plate was set to 290 ℃, and the flow rate of the molten blend in the spinneret plate was 0.4ghm. The two sides of the spinneret plate are provided with air knives, and the hot air volume of the air knives is 53m ³ The temperature of hot air is set to 290 ℃, the interval between the air knife and the forming position of the melt-blown non-woven fabric is set to 150mm (namely, the interval between the air knife and a winding net curtain), the interval between the inclined plane of the air knife and the inclined plane of a spinneret plate is 1.1mm, and meanwhile, the included angle of the V-shaped inclined plane formed by the air knives on the two sides of the spinneret plate is 65 degrees. And S3, stacking and bonding the fiber filaments sprayed out of the spinneret orifices at the position of the winding net curtain to form the melt-blown non-woven fabric, wherein the temperature at the position of the winding net curtain is 80 ℃, namely the forming temperature of the polyester melt-blown non-woven fabric. After the fiber filaments form melt-blown non-woven fabrics at the winding net curtain, the melt-blown non-woven fabrics are cooled by a constant-temperature spraying system, the temperature of the constant-temperature spraying system is set to be 19 ℃, the spraying flow is 300ml/min, and the spraying pressure is 0.3MPa.

The polybutylene terephthalate melt-blown nonwoven fabric prepared by the method has the surface fiber diameter of 200nm-10 mu m, the filtering precision of 13 mu m, 0.1 percent of inhibitor is contained in the nonwoven fabric, and the intrinsic viscosity of the fiber material of the polyester melt-blown nonwoven fabric is 0.6L/g. The product is measured for the transverse breaking strength and the longitudinal breaking elongation, so that the non-woven fabric is 53N in transverse breaking strength, 88N in longitudinal breaking strength, 41% in transverse breaking elongation and 29% in longitudinal breaking elongation. And meanwhile, the diameter distribution of the fiber filaments is measured, the mass ratio of the fine fiber filaments with the diameters of 200nm-1000nm is 43%, the mass ratio of the coarse fiber filaments with the diameters of 1-10 mu m is 57%, the standard deviation of the fiber filament diameters is 0.9 mu m, the gram weight of the whole polybutylene terephthalate melt-blown non-woven fabric is 127 g/square meter, and the ventilation rate is 273mm/s. Further, the nonwoven fabric of example six was selected to be a single-layer disc with a diameter of 47mm, and the particulate impurities of 5 μm or more were filtered in water at 5kPa and 20℃with an interception efficiency of 95%.

Embodiment seven:

a process for preparing the melt-blown non-woven polyester fabric features that the polybutylene terephthalate with intrinsic viscosity of 0.5dL/g and weight-average molecular weight of 21000 is used as raw polyester material. The method comprises the step S0 of drying the polybutylene terephthalate, and fully discharging the water in the polybutylene terephthalate by using a low-temperature drying and blowing mode. Step S1, raw materials are mixed, and polybutylene terephthalate with the mass content of 98% and (2, 4, 6-tri-tert-butylphenyl-2-butyl-2-ethyl) -1, 3-propanediol phosphite ester with the mass content of 2% are uniformly mixed. In the step S1, firstly, the polybutylene terephthalate and the (2, 4, 6-tri-tert-butylphenyl-2-butyl-2-ethyl) -1, 3-propanediol phosphite ester are subjected to primary melt mixing in an extruder at 290 ℃, and when the mixed material is extruded from the extruder, the mixed material enters a static mixer at 290 ℃ for secondary melt mixing, so that the materials are uniformly mixed. Step S2, melt spinning, namely melt extruding the blend obtained in the step S1 in an extruder, and metering and air-blowing by a metering pumpThe knife pulls to form fiber filaments between 200nm and 10 mu m. In this step, the length of the spinneret plate was 1350mm, the number of the spinneret holes was 3100, the diameter of each spinneret hole was 0.4mm, the pitch of each spinneret hole was 0.9mm, the aspect ratio of the spinneret hole was 29, and the temperature of the spinneret plate was set to 300 ℃, and the flow rate of the molten blend in the spinneret plate was 0.5ghm. The two sides of the spinneret plate are provided with air knives, and the hot air volume of the air knives is 56m ³ And/min, the temperature of hot air is set to 300 ℃, the interval between the air knife and the forming position of the melt-blown non-woven fabric is set to 170mm (namely, the interval between the air knife and a winding net curtain), the interval between the inclined plane of the air knife and the inclined plane of a spinneret plate is 1.3mm, and meanwhile, the included angle of the V-shaped inclined plane formed by the air knives on the two sides of the spinneret plate is 75 degrees. And S3, stacking and bonding the fiber filaments sprayed out of the spinneret orifices at the position of the winding net curtain to form the melt-blown non-woven fabric, wherein the temperature at the position of the winding net curtain is 200 ℃, namely the forming temperature of the polyester melt-blown non-woven fabric. After the fiber filaments form melt-blown non-woven fabrics at the winding net curtain, the melt-blown non-woven fabrics are cooled by a constant-temperature spraying system, the temperature of the constant-temperature spraying system is set to be 19 ℃, the spraying flow is 300ml/min, and the spraying pressure is 0.3MPa.

The polybutylene terephthalate melt-blown nonwoven fabric prepared by the method has the surface fiber diameter of 200nm-10 mu m, the filtering precision of 15 mu m, and the nonwoven fabric contains 2 percent of inhibitor, and the intrinsic viscosity of the fiber material of the polyester melt-blown nonwoven fabric is 0.5L/g. The product is measured for the transverse breaking strength and the longitudinal breaking elongation, so that the non-woven fabric is obtained, the transverse breaking strength is 60N, the longitudinal breaking strength is 58N, the transverse breaking elongation is 49%, and the longitudinal breaking elongation is 20%. And meanwhile, the diameter distribution of the fiber filaments is measured, the mass ratio of the fine fiber filaments with the diameters of 200nm-1000nm is 37%, the mass ratio of the coarse fiber filaments with the diameters of 1-10 mu m is 63%, the standard deviation of the fiber filament diameters is 1.1 mu m, the gram weight of the whole polybutylene terephthalate melt-blown non-woven fabric is 144 g/square meter, and the air permeability is 332mm/s. Further, a single-layer disc with a diameter of 47mm was produced from the nonwoven fabric of example seven, and the particulate impurities of 5 μm or more were filtered in water at 5kPa and 20℃with a blocking efficiency of 93%.

Example eight:

a process for preparing the melt-blown non-woven polyester fabric features that the polybutylene terephthalate with intrinsic viscosity of 0.7dL/g and weight-average molecular weight of 29000 is chosen as raw polyester material. The method comprises the step S0 of drying the polybutylene terephthalate, and fully discharging the water in the polybutylene terephthalate by using a low-temperature drying and blowing mode. Step S1, mixing raw materials, and uniformly mixing 97% of polybutylene terephthalate and 3% of dioctadecyl thiodipropionate. In the step S1, firstly, the polybutylene terephthalate and the dioctadecyl thiodipropionate are subjected to primary melt mixing in an extruder at 300 ℃, and when the mixed material is extruded from the extruder, the mixed material enters a static mixer at 300 ℃ for secondary melt mixing, so that the materials are uniformly mixed. And S2, melt spinning, namely, melt extruding the blend obtained in the step S1 in an extruder, and drawing by a metering pump and an air knife to form fiber filaments with the diameter of 200nm-10 mu m. In this step, the length of the spinneret plate was 1250mm, the number of the spinneret holes was 3200, the diameter of each spinneret hole was 0.3mm, the pitch of each spinneret hole was 1mm, the aspect ratio of the spinneret hole was 26, and the temperature of the spinneret plate was set to 310 ℃, and the flow rate of the molten blend in the spinneret plate was 0.45ghm. The two sides of the spinneret plate are provided with air knives, and the hot air volume of the air knives is 59m ³ The temperature of hot air is set to 310 ℃, the interval between the air knife and the forming position of the melt-blown non-woven fabric is set to 190mm (namely, the interval between the air knife and a winding net curtain), the interval between the inclined plane of the air knife and the inclined plane of a spinneret plate is 1.5mm, and meanwhile, the included angle of the V-shaped inclined plane formed by the air knives on the two sides of the spinneret plate is 85 degrees. And S3, stacking and bonding the fiber filaments sprayed out of the spinneret orifices at the position of the winding net curtain to form the melt-blown non-woven fabric, wherein the temperature at the position of the winding net curtain is 190 ℃, namely the forming temperature of the polyester melt-blown non-woven fabric. After the fiber filaments form melt-blown non-woven fabrics at the winding net curtain, the melt-blown non-woven fabrics are cooled by a constant-temperature spraying system, the temperature of the constant-temperature spraying system is set to be 19 ℃, the spraying flow is 300ml/min, and the spraying pressure is 0.3MPa.

The polybutylene terephthalate melt-blown nonwoven fabric prepared by the method has the surface fiber diameter of 200nm-10 mu m, the filtering precision of 17 mu m, and the nonwoven fabric contains 1.3 percent of inhibitor, and the intrinsic viscosity of the fiber material of the polyester melt-blown nonwoven fabric is 0.7L/g. The product is measured for transverse breaking strength and longitudinal breaking elongation, so that the non-woven fabric is obtained, wherein the transverse breaking strength is 55N, the longitudinal breaking strength is 77N, the transverse breaking elongation is 35%, and the longitudinal breaking elongation is 7%. And simultaneously, the diameter distribution of the fiber filaments is measured, the mass ratio of the fine fiber filaments with the diameters of 200nm-1000nm is 33%, the mass ratio of the coarse fiber filaments with the diameters of 1-10 mu m is 67%, the standard deviation of the fiber filament diameters is 1.2 mu m, the gram weight of the whole polybutylene terephthalate melt-blown non-woven fabric is 168 g/square meter, and the ventilation rate is 377mm/s. Further, the nonwoven fabric of example eight was selected to be a single-layer, 47mm diameter disc, and the particulate impurities of 5 μm or more were filtered in water at 5kPa and 20℃with a blocking efficiency of 91%.

Example nine:

a process for preparing the melt-blown non-woven polyester fabric features that the polybutylene terephthalate with intrinsic viscosity of 0.9dL/g and weight-average molecular weight of 33000 is chosen as raw polyester material. The method comprises the step S0 of drying the polybutylene terephthalate, and fully discharging the water in the polybutylene terephthalate by using a low-temperature drying and blowing mode. Step S1, mixing raw materials, and uniformly mixing polybutylene terephthalate with the mass content of 99.3% and 1,3, 5-trimethyl-2, 4, 6-tris (3, 5-di-tert-butyl-4-hydroxybenzyl) benzene with the mass content of 0.7%. In the step S1, firstly, the polybutylene terephthalate and the 1,3, 5-trimethyl-2, 4, 6-tri (3, 5-di-tert-butyl-4-hydroxybenzyl) benzene are subjected to primary melt mixing in an extruder at 260 ℃, and when the mixed material is extruded from the extruder, the mixed material enters a static mixer at 255 ℃ for secondary melt mixing, so that the materials are uniformly mixed. Step S2, melt spinning, namely, after the blend obtained in the step S1 is melt extruded in an extruder, measuring by a metering pump and drawing by an air knife to form 200nm-10Fiber filaments between μm. In this step, the length of the spinneret plate was 1150mm, the number of the spinneret holes was 3050, the diameter of each spinneret hole was 0.3mm, the pitch of each spinneret hole was 0.5mm, the aspect ratio of the spinneret holes was 23, and the temperature of the spinneret plate was set to 320 ℃, and the flow rate of the molten blend in the spinneret plate was 0.35ghm. The two sides of the spinneret plate are provided with air knives, and the hot air volume of the air knives is 35m ³ And/min, the temperature of hot air is set to 330 ℃, the interval between the air knife and the forming position of the melt-blown non-woven fabric is set to 200mm (namely, the interval between the air knife and a winding net curtain), the interval between the inclined plane of the air knife and the inclined plane of a spinneret plate is 1.6mm, and meanwhile, the included angle of the V-shaped inclined plane formed by the air knives on the two sides of the spinneret plate is 66 degrees. And S3, stacking and bonding the fiber filaments sprayed out of the spinneret orifices at the winding curtain to form the melt-blown non-woven fabric, wherein the temperature at the winding curtain is 110 ℃, namely the forming temperature of the polyester melt-blown non-woven fabric. After the fiber filaments form melt-blown non-woven fabrics at the winding net curtain, the melt-blown non-woven fabrics are cooled by a constant-temperature spraying system, the temperature of the constant-temperature spraying system is set to be 19 ℃, the spraying flow is 300ml/min, and the spraying pressure is 0.3MPa.

The polybutylene terephthalate melt-blown nonwoven fabric prepared by the method has the surface fiber diameter of 200nm-10 mu m, the filtering precision of 19 mu m, 0.7 percent of inhibitor is contained in the nonwoven fabric, and the intrinsic viscosity of the fiber material of the polyester melt-blown nonwoven fabric is 0.9L/g. The product is measured for transverse breaking strength and longitudinal breaking elongation, so that the non-woven fabric is 46N in transverse breaking strength, 84N in longitudinal breaking strength, 48% in transverse breaking elongation and 4% in longitudinal breaking elongation. And meanwhile, the diameter distribution of the fiber filaments is measured, the mass ratio of the fine fiber filaments with the diameters of 200nm-1000nm is 31%, the mass ratio of the coarse fiber filaments with the diameters of 1-10 mu m is 69%, the standard deviation of the fiber filament diameters is 0.4 mu m, the gram weight of the whole polybutylene terephthalate melt-blown non-woven fabric is 183 g/square meter, and the air permeability is 421mm/s. Further, a single-layer disc with a diameter of 47mm was produced from the nonwoven fabric of example nine, and the particulate impurities of 5 μm or more were filtered in water at 5kPa and 20℃with an interception efficiency of 94%.

Example ten:

a process for preparing the melt-blown non-woven polyester fabric features that the polybutylene terephthalate with intrinsic viscosity of 0.5dL/g and weight-average molecular weight of 21000 is used as raw polyester material. The method comprises the step S0 of drying the polybutylene terephthalate, and fully discharging the water in the polybutylene terephthalate by using a low-temperature drying and blowing mode. Step S1, mixing raw materials, namely, polybutylene terephthalate with the mass content of 99.6 percent and [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid with the mass content of 0.4 percent]Pentaerythritol esters were mixed homogeneously. In step S1, polybutylene terephthalate and [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid are first reacted]The pentaerythritol ester is subjected to primary melt mixing in an extruder at 270 ℃, and the mixture enters a static mixer for secondary melt mixing at 245 ℃ after being extruded from the extruder, so that the materials are uniformly mixed. And S2, melt spinning, namely, melt extruding the blend obtained in the step S1 in an extruder, and drawing by a metering pump and an air knife to form fiber filaments with the diameter of 200nm-10 mu m. In this step, the length of the spinneret plate was 1050mm, the number of the spinneret holes was 2950, the diameter of each spinneret hole was 0.2mm, the pitch of each spinneret hole was 0.3mm, the aspect ratio of the spinneret holes was 18, and the temperature of the spinneret plate was set to 305 ℃, and the flow rate of the molten blend in the spinneret plate was 025ghm. The two sides of the spinneret plate are provided with air knives, and the hot air volume of the air knives is 32m ³ The temperature of hot air is set to 295 ℃, the interval between the air knife and the forming position of melt-blown non-woven fabric is set to 185mm (namely, the interval between the air knife and a winding net curtain), the interval between the inclined plane of the air knife and the inclined plane of a spinneret plate is 0.9mm, and meanwhile, the included angle of the V-shaped inclined plane formed by the air knives on the two sides of the spinneret plate is 72 degrees. And S3, stacking and bonding the fiber filaments sprayed out of the spinneret orifices at the winding curtain to form the melt-blown non-woven fabric, wherein the temperature at the winding curtain is 85 ℃, namely the forming temperature of the polyester melt-blown non-woven fabric. After the fiber filaments form melt-blown non-woven fabrics at the winding net curtain, the melt-blown non-woven fabrics are cooled by a constant-temperature spraying system, the temperature of the constant-temperature spraying system is set to be 19 ℃, and the spraying flow is 300ml/minThe spray pressure was 0.3MPa.

The polybutylene terephthalate melt-blown nonwoven fabric prepared by the method has the surface fiber diameter of 200nm-10 mu m, the filtering precision of 11 mu m, 0.4% of inhibitor in the nonwoven fabric and the intrinsic viscosity of the fiber material of the polyester melt-blown nonwoven fabric of 0.5L/g. The product is measured for the transverse breaking strength and the longitudinal breaking elongation, so that the non-woven fabric is 33N in the transverse breaking strength, 72N in the longitudinal breaking strength, 27% in the transverse breaking elongation and 9% in the longitudinal breaking elongation. And meanwhile, the diameter distribution of the fiber filaments is measured, the mass ratio of the fine fiber filaments with the diameters of 200nm-1000nm is 44%, the mass ratio of the coarse fiber filaments with the diameters of 1-10 mu m is 56%, the standard deviation of the fiber filament diameters is 0.6 mu m, the gram weight of the whole polybutylene terephthalate melt-blown non-woven fabric is 198 g/square meter, and the air permeability is 489mm/s. Further, a single-layer wafer with a diameter of 47mm was produced from the nonwoven fabric of example ten, and the particulate impurities of 5 μm or more were filtered in water at 5kPa and 20℃with an interception efficiency of 90%.

Comparative example one:

the procedure of comparative example one was different from that of example one in that the raw materials of comparative example one were not added with inhibitors, and the rest were the same.

The polybutylene terephthalate melt-blown nonwoven fabric prepared by the method of comparative example one had a fiber diameter of 1 μm to 15 μm on the surface, a filtration accuracy of 5 μm, and an intrinsic viscosity of 0.5L/g of the fiber material of the polyester melt-blown nonwoven fabric. The product is measured for the transverse breaking strength and the longitudinal breaking elongation, so that the non-woven fabric is obtained, wherein the transverse breaking strength is 2N, the longitudinal breaking strength is 15N, the transverse breaking elongation is 2%, and the longitudinal breaking elongation is 3.5%. And the standard deviation of the fiber diameter is 1.8 mu m, the gram weight of the whole polybutylene terephthalate melt-blown non-woven fabric is 32 g/square meter, and the ventilation is 46mm/s. Further, a single-layer wafer with a diameter of 47mm was produced from the nonwoven fabric of comparative example one, and the particulate impurities of 5 μm or more were filtered in water at 5kPa and 20℃with an interception efficiency of 43%.

Comparative example two:

the method of comparative example II is different from that of example II in that the raw materials of comparative example II are not added with inhibitors, and the rest are the same.

The polybutylene terephthalate melt-blown nonwoven fabric prepared by the method of comparative example II had a fiber diameter of 3 μm to 16 μm on the surface, a filtration accuracy of 8 μm, and an intrinsic viscosity of 0.7L/g of the fiber material of the polyester melt-blown nonwoven fabric. And measuring the breaking strength and the breaking elongation of the product in the transverse direction and the longitudinal direction to obtain the non-woven fabric with the breaking strength of 8N in the transverse direction, the breaking strength of 12N in the longitudinal direction, the breaking elongation of 8% in the transverse direction and the breaking elongation of 4.8% in the longitudinal direction. And the standard deviation of the fiber diameter is 2.3 mu m, the gram weight of the whole polybutylene terephthalate melt-blown non-woven fabric is 54 g/square meter, and the ventilation is 102mm/s. Further, a single-layer wafer with the diameter of 47mm is prepared from the non-woven fabric of the second comparative example, and the particle impurities with the particle diameter of more than 5 mu m are filtered in water under the conditions of 5kPa and 20 ℃ with the interception efficiency of 40 percent.

Comparative example three:

the method of comparative example three is different from that of example three in that the raw materials of comparative example three are not added with inhibitors, and the rest are the same.

The polyethylene terephthalate melt-blown nonwoven fabric prepared by the method of comparative example three had a fiber diameter of 5 μm to 18 μm on the surface, a filtration accuracy of 11 μm, and an intrinsic viscosity of 0.9L/g of the fiber material of the polyester melt-blown nonwoven fabric. The product is measured for the transverse breaking strength and the longitudinal breaking elongation, so that the non-woven fabric is obtained, the transverse breaking strength is 12N, the longitudinal breaking strength is 10N, the transverse breaking elongation is 14.2%, and the longitudinal breaking elongation is 6.1%. And the standard deviation of the fiber diameter is 2.4 mu m, the gram weight of the whole polybutylene terephthalate melt-blown non-woven fabric is 68 g/square meter, and the ventilation is 159mm/s. Further, a single-layer wafer with a diameter of 47mm is produced from the nonwoven fabric of the third comparative example, and the particulate impurities with a particle size of 5 μm or more are filtered in water at 5kPa and 20 ℃ with an interception efficiency of 39%.

By comparing the comparative examples one to three with the examples, it can be found that the method of adding the inhibitor to the raw materials in the preparation method has smaller fiber diameter, higher filtering precision and relatively larger breaking strength and breaking elongation compared with the method of not adding the inhibitor, and the scheme of adding the inhibitor is illustrated that the final product has high strength and relatively more uniform diameter thickness of the fiber yarn.

In examples one to ten and comparative examples one to three, the method for detecting inhibitors in nonwoven fabrics was as follows: 1. a certain amount of polyester non-woven fabric is taken, and the polyester matrix material is dissolved by a solvent. 2. Extracting insoluble substances, purifying, and drying to obtain the inhibitor. 3. And (3) the molecular formula of the obtained substance can be judged through infrared spectrum and mass spectrum analysis and test. 4. The weight percentage of the obtained substances in the polyester non-woven fabric is the content thereof. The method for measuring the average diameter of the nanofiber is to use a scanning electron microscope to characterize the morphology of the melt-blown non-woven fabric, and then use computer software (such as Matlab, NIS-Elements and the like) or manually measure the morphology. The standard deviation of the fiber diameter is calculated by firstly using a scanning electron microscope to characterize the morphology of the melt-blown non-woven fabric, then using computer software (such as Matlab, NIS-Elements and the like) or manually taking a plurality of single fiber filaments, measuring the diameters of the single fiber filaments at different positions, and then calculating the standard deviation. The specific detection method for breaking strength and breaking elongation is according to the national standard: GB/T24218.3-2010, textile, nonwoven test methods, section 3, determination of breaking strength and elongation at break (bar method). The transverse direction and the longitudinal direction of the polyester melt-blown nonwoven fabric are defined as the longitudinal direction of the film running direction, and the width direction of the polyester melt-blown nonwoven fabric is the transverse direction. The method for measuring the intrinsic viscosity mentioned in examples and comparative examples is as follows: 1. taking a certain weight of dried polyester raw material or non-woven fabric (needing to be sheared) and dissolving the polyester raw material or non-woven fabric in a solvent to prepare a solution with a certain concentration. 2. The viscosity is measured by a viscometer at a specific temperature (typically 25 ℃), and the intrinsic viscosity is deduced from the formula.

While the preferred embodiments of the present invention have been described in detail, it will be appreciated that those skilled in the art, upon reading the above teachings, may make various changes and modifications to the invention. Such equivalents are also intended to fall within the scope of the claims appended hereto.

Claims

1. A polyester meltblown nonwoven fabric comprising filaments stacked and bonded to one another, characterized in that: the diameter of the fiber filaments is between 200nm and 10 mu m, the polyester melt-blown non-woven fabric contains 0.1% -3.0% of inhibitor, the interception efficiency of the polyester melt-blown non-woven fabric to 5 mu m and above particle impurities is more than or equal to 90%, and the intrinsic viscosity of the fiber material of the polyester melt-blown non-woven fabric is between 0.5dL/g and 1.2 dL/g;

the breaking strength of the polyester melt-blown non-woven fabric in the longitudinal direction is set between 3N and 90N, and the breaking elongation in the longitudinal direction is set between 1% and 30%; the transverse breaking strength of the polyester melt-blown non-woven fabric is between 3N and 60N, and the transverse breaking elongation is between 3 and 50 percent;

the inhibitor is one or more of hindered phenol antioxidants, phosphite antioxidants and/or organic sulfur antioxidants;

The hindered phenol antioxidant includes, but is not limited to, pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] and stearyl 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate; the phosphite antioxidants include, but are not limited to, tris (2, 4-di-tert-butylphenyl) phosphite, bis (2, 4-di-tert-butylphenyl) pentaerythritol diphosphite, (2, 4, 6-tri-tert-butylphenyl-2-butyl-2-ethyl) -1, 3-propanediol phosphite; the organic sulfur antioxidant comprises, but is not limited to pentaerythritol dodecyl thio propyl ester and dioctadecyl thiodipropionate;

the ratio of the transverse breaking strength to the longitudinal breaking strength of the polyester melt-blown non-woven fabric is set between 0.2 and 1; the ratio of the elongation at break in the transverse direction to the elongation at break in the longitudinal direction is set between 1 and 15;

the fiber yarn comprises fine fiber yarn with the diameter of 200nm-1000nm and coarse fiber yarn with the diameter of 1 mu m-10 mu m, wherein the mass proportion of the fine fiber yarn is 30% -70%, and the mass proportion of the coarse fiber yarn is 30% -70%;

the standard deviation of the fiber diameter is set between 0.1 μm and 1.2 μm.

2. The polyester meltblown nonwoven fabric according to claim 1, wherein the gram weight of the polyester meltblown nonwoven fabric is set between 20 g/square meter and 200 g/square meter and the air permeability is set between 20mm/s and 500 mm/s.

3. The method for producing a polyester meltblown nonwoven fabric according to any one of claims 1 to 2, characterized by comprising the steps of:

s1: mixing raw materials, and uniformly mixing a polyester raw material with the mass content of 97% -99.9% and an inhibitor with the mass content of 0.1% -3.0%;

s2: melt spinning, namely, carrying out melt extrusion on the blend obtained in the step S1 in an extruder, then carrying out metering by a metering pump and traction by an air knife, and carrying out melt blowing by a spinneret plate to form fiber filaments with the diameter of 200nm-10 mu m, wherein the intrinsic viscosity of the polyester raw material is set to be 0.5dL/g-1.2 dL/g;

s3: and (3) receiving and forming, interweaving and bonding the fiber filaments sprayed out in the step (S2) on a winding net curtain to form melt-blown non-woven fabrics, and cooling and forming through a cooling device.

4. The method for producing a polyester meltblown nonwoven fabric according to claim 3, wherein the raw materials are first melt-mixed in an extruder and then melt-mixed in a static disperser for the second time.

5. The method of producing a polyester meltblown nonwoven fabric according to claim 4, wherein the temperature of the primary melt mixing is set between 230 ℃ and 300 ℃ and the temperature of the secondary melt mixing is set between 250 ℃ and 300 ℃.

6. The method for producing a polyester meltblown nonwoven fabric according to claim 3, wherein the inhibitor in step S1 is one or more of hindered phenols and/or phosphites and/or organosulfur compounds.

7. The method of making a polyester meltblown nonwoven fabric according to claim 6, wherein said hindered phenolic antioxidants include, but are not limited to, pentaerythritol tetrakis [ β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], stearyl 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, 1,3, 5-trimethyl-2, 4, 6-tris (3, 5-di-tert-butyl-4-hydroxybenzyl) benzene; the phosphite antioxidants include, but are not limited to, tris (2, 4-di-tert-butylphenyl) phosphite, bis (2, 4-di-tert-butylphenyl) pentaerythritol diphosphite, (2, 4, 6-tri-tert-butylphenyl-2-butyl-2-ethyl) -1, 3-propanediol phosphite; the organic sulfur antioxidant includes but is not limited to pentaerythritol dodecyl thio propyl ester and dioctadecyl thiodipropionate.

8. The method of producing a polyester meltblown nonwoven fabric according to claim 3, wherein the polyester raw material comprises a polyester raw material having an intrinsic viscosity; or the polyester raw material comprises two or more than two kinds of intrinsic viscosity polyester raw materials.

9. The method of making a polyester meltblown nonwoven fabric according to claim 8, wherein the polyester raw materials include, but are not limited to, polybutylene terephthalate, polyethylene terephthalate, and polypropylene terephthalate.

10. The method for producing a polyester melt-blown nonwoven fabric according to claim 3, wherein the length of the spinneret plate in the step S2 is 1000mm to 1400mm, the number of the spinneret holes is 2500 to 3200, the pore diameter of the spinneret holes is 0.1mm to 0.5mm, the pore spacing is 0.3mm to 1.0mm, and the aspect ratio of the spinneret holes is 15 to 30.

11. The method of producing a polyester meltblown nonwoven fabric according to claim 3 or 10, characterized in that the temperature of the spinneret in step S2 is between 240 ℃ and 320 ℃ and the flow rate of the molten blend in the spinneret is between 0.03ghm and 0.5 ghm.

12. The method for producing a polyester meltblown nonwoven fabric according to claim 3, wherein the temperature at which the meltblown nonwoven fabric is formed in step S3 is set between 80 ℃ and 200 ℃.

13. The method for producing a polyester meltblown nonwoven fabric according to claim 12, wherein the air volume of the air knife in step S2 is set at 20m ³ /min-60m ³ And the temperature of the hot air is set between 240 ℃ and 330 ℃, the interval between the air knife and the forming position of the melt-blown non-woven fabric is set between 50mm and 200mm, the air knives are arranged on two sides of the spinneret hole, and the interval between the inclined plane of the air knife and the inclined plane of the spinneret plate is set between 0.5mm and 1.6 mm.

14. The method for preparing a polyester melt-blown nonwoven fabric according to claim 13, wherein the included angle of the V-shaped inclined plane formed by the air knives at the two sides of the spinneret orifice is set between 60 ° and 90 °.

15. The method for producing a polyester meltblown nonwoven fabric according to claim 3, wherein the weight average molecular weight of the polyester raw material in step S1 is selected to be 20000 to 60000.

16. The method for producing a polyester meltblown nonwoven fabric according to claim 3, wherein the step S1 is preceded by the step S0 of: the polyester raw material is dried.