Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
  • G01N30/02—Column chromatography
  • G01N30/88—Integrated analysis systems specially adapted therefor, not covered by a single one of the groups G01N30/04 - G01N30/86
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
  • G01N33/44—Resins; Plastics; Rubber; Leather
  • G01N33/442—Resins; Plastics
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
  • D01D5/00—Formation of filaments, threads, or the like
  • D01D5/08—Melt spinning methods
  • D01D5/098—Melt spinning methods with simultaneous stretching
  • D01D5/0985—Melt spinning methods with simultaneous stretching by means of a flowing gas (e.g. melt-blowing)
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
  • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
  • D01F6/02—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • D01F6/04—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polyolefins
  • D01F6/06—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polyolefins from polypropylene
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
  • G01N30/02—Column chromatography
  • G01N2030/022—Column chromatography characterised by the kind of separation mechanism
  • G01N2030/027—Liquid chromatography

Definitions

• the present invention relates to a method for evaluating physical properties of a melt-blown plastic resin. More specifically, the present invention relates to a method for evaluating physical properties in which, when a particular plastic resin is processed by a melt-blown process, a stretching diameter value after the melt-blown process can be accurately derived from a physical property value measured using a specimen of the resin.
• Nonwoven fabric or nonwoven web is a three-dimensional fiber aggregate in which fine fibers having a diameter of about 10 ⁇ m are randomly entangled to have a structure like a spider web.
• the nonwoven fabric or the nonwoven web is formed by bonding fine fibers to each other, the nonwoven fabric or the nonwoven web is very excellent in texture, touch, or the like, and has good processability and excellent strength, ductility, and abrasion resistance.
• Such nonwoven fabric is used for various purposes in various technical fields, such as bandage materials, oil absorbing materials, building materials for sound absorption, disposable diapers, feminine hygiene products or the like. In recent years, it is widely used also in the latest technology fields, such as dustproof clothing, a dustproof mask, a wiping cloth, a microfiltration filter, and a battery separator.
• the melt-blown process is a process in which the thermoplastic resin capable of forming a fiber yarn is discharged in a molten form through an orifice die to which a plurality of orifices having hundreds to thousands of cavities are connected, a high-temperature gas is injected from high-speed gas nozzles disposed on both sides of the die, fiber yarns are stretched into ultrafine yarns, and the ultrafine fiber yarns are laminated on the collection drum.
• melt blown nonwoven fabrics can be used in various applications as described above due to the structural features in which the ultrafine fiber aggregates are formed into a bulky structure.
• the diameter of the fiber yarn is determined, which is greatly affected by the properties of the plastic resin itself as well as the discharge pressure, gas temperature, and gas injection speed.
• One aspect of the present invention provides a method for evaluating physical properties of a melt-blown plastic resin including the steps of:
• the diameter of the fiber yarn produced in the melt-blown process can be accurately derived only by the physical properties measured by a specimen, which is thus economical in terms of time and money.
• the method for evaluating physical properties according to the present invention includes the steps of:
• the plastic resin is a concept including a thermoplastic polymer plastic, and means a polymer plastic resin that can be processed into a fiber yarn form by a melt-blown process.
• the method for evaluating physical properties of a melt-blown plastic resin according to one aspect of the present invention includes the steps of:
• the present inventors have made a hypothesis that in the melt-blown molding process of a plastic resin, the stretching diameter of the fiber yarn discharged and processed by the cavity of the orifice is related to the molecular weight characteristics of the plastic resin, and then have found that the stretching diameter of the actual fiber yarn can be accurately derived through specific factors that can be measured from plastic resin specimens, thereby completing the present invention.
• the molecular weight distribution value is measured using a measuring instrument such as GPC, and a peak molecular weight value and a molecular weight distribution value are derived from the molecular weight distribution, and then from these two values as relevant factors, the stretching diameter value of the fiber yarn can be accurately derived in the melt-blown process.
• the peak molecular weight value means a molecular weight value corresponding to the largest peak when the molecular weight distribution of the plastic resin specimen was measured by GPC/SEC, that is, a molecular weight value of the molecule occupying the highest fraction in the plastic resin including molecules having various molecular weight values.
• the stretching diameter value of the fiber yarn formed by the melt-blown process is a value that can vary depending on the conditions of the process
• the melt-blown process may be performed under the temperature condition of about 150° C. to about 250° C., preferably at a temperature of about 170° C. or about 230° C.
• the present invention is not necessarily limited to the above-mentioned process conditions, and this may vary depending on the melting characteristics of the plastic resin to be processed.
• the stretching diameter value of the fiber yarn formed by the melt-blown process is a value that may vary depending on the stretch ratio in the process.
• the longitudinal stretch ratio may be about 100 to about 10,000 times, preferably about 100 to about 1,500 times, or about 200 to about 1.200 times.
• the stretching speed may be about 1,000 to about 100,000 times/s, preferably about 1000 to about 15,000 times/s, or about 200 to about 1,200 times/s.
• the present invention is not necessarily limited to the above-mentioned process conditions, and the stretching conditions as above may also vary depending on the melting characteristics of the plastic resin to be processed.
• the step of predicting the stretching diameter using the peak molecular weight value and the molecular weight distribution value may include a step of deriving a polymer characteristic factor using Mathematical Formula 1 below, and it may include a step of predicting a stretching diameter from this polymer characteristic factor using Mathematical Formula 2 below.
• MWD is a molecular weight distribution value (Mw/Mn)
• Mp is a peak molecular weight value
• a 0.01 to 0.02.
• c 0.20 to 0.22.
• d is 1.01 to 1.02
• e is 0.005 to 0.007.
• each coefficient of Mathematical Formulae 1 and 2 may be determined by the steps of measuring the stretching diameter values of a fiber yarn in the actual melt-flown process for some plastic specimens, measuring the above-mentioned MWD value and Mp value, and then substituting the measured values into the functions represented by Mathematical Formulae 1 and 2 to derive the value of each coefficient, and this can be used as a reference.
• a may have a value of about 0.01 to about 0.02, preferably about 0.012 to about 0.015, b may have a value of about 0.8 to about 1.0, preferably about 0.85 to about 0.90, and c may have a value of about 0.2 to about 0.22, preferably about 0.205 to about 0.210.
• d may have a value of about 1.01 to about 1.02, preferably about 1.015 to about 1.017, e may have a value of about 0.005 to about 0.007, preferably about 0.006 to 0.0061.
• the present invention is not necessarily limited to the range of the respective coefficients a to e described above, and respective coefficients may be determined differently according to the molecular weight and melting characteristics of the plastic resin to be measured.
• the predicted stretching diameter is about 0.35 mm or less, more preferably, when it is about 0.2 to about 0.35 mm, it can be determined to be suitable.
• the melt-blown process under the above-described conditions may be regarded as a process of forming a fiber yarn for nonwoven fabric production. If the stretching diameter of the fiber yarn in the actual process is too large, the texture of the nonwoven fabric produced is degraded, sound absorption or sound insulation properties may be degraded. If the stretching diameter is too small, it may cause a problem that the mechanical strength of the nonwoven fabric is lowered.
• the method for evaluating physical properties according to the present invention as described above is applicable to various plastic polymer resins which are produced in the form of fiber yarn by a melt-blown process.
• the method may be applied to a plastic resin in which the above-mentioned peak molecular weight value is about 10.000 to about 150.000 g/mol, preferably about 30,000 to about 120.000 g/mol.
• the method may be applied to a plastic resin in which the above-described molecular weight distribution value, that is, the ratio (Mw/Mn) of the weight average molecular weight value to the number average molecular weight value is about 4 or less, preferably about 1 to 4, more preferably about 2 to about 3.5.
• the method may be applied to a plastic resin in which the number average molecular weight value is about 10,000 to about 50,000 g/mol, preferably about 20,000 to about 45.000 g/mol.
• the weight average molecular weight value of such plastic resin may be preferably about 10,000 to about 200,000 g/mol, preferably about 50,000 to about 140,000 g/mol.
• ABS-based resin, urethane epoxy-based resin, urethane acrylic-based resin, amino resin, phenol resin, and polyester-based resin are subjected to a melt-blown molding process to form a fiber yarn, and such fiber yarn can be applied for various plastic resins that are processed into products, but when it is applied for a thermoplastic resin, more accurate evaluation results can be presented.
• it may be preferably applied to a polyolefin-based resin such as polyethylene and polypropylene resin, among which polypropylene-based resin is most preferred.
• the polypropylene resin having physical property values shown in Table 1 below was dried in a vacuum oven at 40° C. overnight to prepare in the form of pellets using a twin screw extruder (BA-19, manufacturer BAUTECH).
• the resin in the form of pellets obtained by compression was again dried in a vacuum oven at 40° C. overnight, and then a specimen was prepared in a form suitable for the measurement conditions of each physical property using a specimen manufacturing machine (Xplore 5.cc micro injection molding machine).
• Molecular weight characteristics of the prepared specimens were measured via GPC/SEC. The number average molecular weight, the weight average molecular weight, the molecular weight distribution value, and the peak molecular weight value were simultaneously measured.
• the peak molecular weight value and the molecular weight distribution value were substituted into the following Mathematical Formulas to predict the stretching diameter value of the fiber yarn after the melt-blown process.
• DHR Discovery Hybrid Rheometer
• the prepared polypropylene pellet was melted and loaded between the upper and lower plates of the DHR. (conditions of temperature: 170° C., initial diameter of PP loaded between upper and lower plates: 8 mm, initial thickness: 1.5 mm).
• the molten PP which was loaded between the upper and lower plates, was stretched while the upper plate of the DHR was raised to a stretching speed of 10 mm/s, which was taken with an ultrafast camera (IDT's CrashCam 1520), and the diameter of the stretched PP was measured through image analysis (analysis tool: imageJ).
• Example 1 22055 52625 2.39 40,371
• Example 2 40385 93264 2.31 72,898
• Example 3 35326 90003 2.55 83,935
• Example 4 26605 57806 2.17 55,674
• Example 5 22156 49442 2.23 45,953
• Example 6 23764 54845 2.20 56,638
• Example 7 25328 57571 2.27 58,453
• Example 8 39255 137899 3.51 104,164
• Example 9 42560 128591 3.02 96,022
• Example 10 42326 134202 3.17 105,590
• Example 11 44496 131242 2.95 102,759
• Example 1 1093 0.283 0.282 0.242
• Example 2 756 0.310 0.309 0.291
• Example 3 425 0.349 0.349 0.388
• Example 4 954 0.278 0.276 0.259
• Example 5 1093 0.273 0.272 0.242
• Example 6 761 0.282 0.281 0.290
• Example 7 653 0.292 0.291 0.313
• Example 8 284 0.484 0.486 0.475
• Example 9 359 0.417 0.417 0.422
• Example 10 337 0.443 0.445 0.436
• Example 11 443 0.414 0.415 0.380
• the tensile diameter of the fiber yarn predicted according to one example of the present invention has a value very similar to that of the fiber yarn measured in the actual process.
• the Pearson correlation coefficient value appears to reach about 0.92, confirming that it has a very high correlation.
• respective stretch ratios are different when stretched at the same speed, it can be confirmed that the correlation between the actual value and the predicted value is very high. This can be seen as clearly explaining that the actual tensile diameter value of the plastic resin fiber yarn is directly related to the above-described molecular weight distribution value and peak molecular weight value.
• the actual tensile diameter value of the plastic resin fiber yarn is clearly verified as having a first order correlation with the value predicted by Mathematical Formulae 1 and 2. This can be said to be the result clearly supporting that as shown in the present invention, in the melt-blown process of the plastic resin, the tensile diameter value of the fiber yarn has a direct correlation with the molecular weight characteristic of each plastic resin, regardless of each coefficient value used in Mathematical Formulae 1 and 2.

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Health & Medical Sciences (AREA)
• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Pathology (AREA)
• Analytical Chemistry (AREA)
• Biochemistry (AREA)
• General Health & Medical Sciences (AREA)
• Immunology (AREA)
• Medicinal Chemistry (AREA)
• Food Science & Technology (AREA)
• Mechanical Engineering (AREA)
• Textile Engineering (AREA)
• Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
• Artificial Filaments (AREA)
• Nonwoven Fabrics (AREA)
• Theoretical Computer Science (AREA)
• Computer Hardware Design (AREA)
• Evolutionary Computation (AREA)
• Geometry (AREA)
• General Engineering & Computer Science (AREA)
• Architecture (AREA)
• Software Systems (AREA)
• Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
• Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)

Applications Claiming Priority (3)

Related Parent Applications (1)

Related Child Applications (1)

Publications (1)

Family

ID=65723734

Family Applications (2)

Family Applications After (1)

Country Status (6)

Citations (2)

Family Cites Families (19)

• 2017
  • 2017-09-15 KR KR1020170118860A patent/KR102128597B1/ko active IP Right Grant
• 2018
  • 2018-09-11 JP JP2020513303A patent/JP2020532663A/ja active Pending
  • 2018-09-11 US US16/645,298 patent/US20210080437A1/en not_active Abandoned
  • 2018-09-11 EP EP18855706.0A patent/EP3667524B1/fr active Active
  • 2018-09-11 CN CN201880059701.9A patent/CN111133520B/zh active Active
  • 2018-09-11 WO PCT/KR2018/010633 patent/WO2019054726A1/fr unknown
• 2023
  • 2023-03-28 US US18/127,457 patent/US11913923B2/en active Active

Patent Citations (2)

Also Published As

Similar Documents

Legal Events