KR101039125B1 - Nonionic hydrophilic polypropylene short fibers and method for manufacturing the same, nonwoven fabric made therefrom - Google Patents

Abstract

Nonionic hydrophilic polypropylene short fibers and a method for manufacturing the same, and a nonwoven fabric made therefrom. More specifically, a nonionic hydrophilic agent is attached to the surface of melt-spun polypropylene. It relates to a nonionic hydrophilic polypropylene short fiber consisting of 0.40 to 2.0 parts by weight, a method for producing the same, and a thermal bond nonwoven fabric made therefrom. This has the effect of reducing the generation of static electricity even without including the antistatic agent used in the production of short fibers while maintaining hydrophilicity.

Nonionic, Polypropylene, Thermal Bond Process, Non-Woven

Description

Nonionic hydrophilic polypropylene staple fibers and methods of the same, nonwoven made of them

The present invention relates to a nonionic hydrophilic polypropylene short fiber and a method for manufacturing the same, and a nonwoven fabric made therefrom, and more particularly, to a hydrophilic polypropylene short fiber, a polypropylene short fiber which improves workability, productivity, nonwoven quality, and the like. It relates to a manufacturing method and a nonwoven fabric made therefrom.

In general, polypropylene fibers are hydrophobic, and because of their low melting point, they are limited for clothing, but they have been used for light sportswear, etc. by using wicking properties, which have advantages in water transfer.

Conventional polypropylene short fibers have the advantages of low melting point, excellent chemical resistance and relatively low price compared to other materials, and have been mainly processed into various nonwoven fabrics through calender bonding method, needle punching method, diaper, sanitary napkin, etc. It is mainly used for the surface material of sanitary products and filters such as air filter and water treatment filter, but its application is very limited due to strong hydrophobicity.

Therefore, many attempts to impart hydrophilicity to hydrophobic polypropylene fibers have been considered, but the effects and the physical properties of the spinning or stretching process are often lowered due to their insignificant effects or compatibility with polypropylene.

Non-woven fabrics are fabrics made by bonding or tangling textile aggregates by mechanical or chemical treatment such as mechanical manipulation or heat bonding, without weaving, weaving, or knitting, needles, resin-bonded nonwovens, needle punches, spunbonds, and spunlaces. , Emboss films, wet nonwovens, and the like. By narrowing, it means that the contact of the web (web) overlapped with the random (random) and the fiber is bonded by resin and used as a wick. Such a nonwoven fabric can be produced by various methods, such as needle punching method, chemical bonding method, thermal bonding method, melt blown method, spunlace method, stitch bond method, spunbond method is known.

Looking at the technique for imparting hydrophilicity to the surface of the hydrophobic polypropylene short fibers as follows.

Japanese Patent Laid-Open No. 2-169774 has proposed a method of attaching a hydrophilic surfactant such as polyester-modified silicone or sorbic acid fatty acid ester to the surface of a hydrophobic fiber. However, in this case, the initial hydrophilicity is excellent, but the duration is short, and the hydrophobic nature of the polypropylene itself is revived as the hydrophilic surfactant is washed out with water.

Korean Patent Laid-Open Publication No. 2007-0091065 discloses an emulsion composition capable of efficiently hydrophilizing hydrophobic polyolefin fibers and a polyolefin nonwoven fabric treated therewith, in the case of producing hydrophobic polypropylene short fibers and nonwoven fabrics with a spinning emulsion, the ratio of the antistatic agent in the emulsion component The lower the hydrophilic performance of the nonwoven fabric, the lower the hydrophilic performance of the nonwoven fabric, while the fairness, nonwoven fabric, and productivity are worsened due to the generation of static electricity during the carding process. This results in performance degradation. The antistatic agent has an intramolecular hydrophilic group and a lipophilic group at the same time and the lipophilic portion is attached or impregnated to the substrate and the hydrophilic portion is oriented outward. In the case of the use of antistatic agents, it is necessary to fine tune and control the composition ratio as the cost increases.

Accordingly, there is a desire for development of a hydrophilic polypropylene short fiber having good nonwoven fabric processability and low static electricity even if the use of an antistatic agent is reduced or not used while maintaining hydrophilic performance.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a hydrophilic polypropylene short fiber and a method for producing the same, which have significantly reduced static electricity compared to hydrophilic polypropylene by using a nonionic emulsion having hydrophilic performance.

Another object of the present invention is to provide a manufacturing technique of the nonwoven fabric produced by using the non-woven polypropylene non-woven fabric is significantly reduced electrostatic generation, while reducing the use of antistatic agents while maintaining the hydrophilicity, compared to the general hydrophilic polypropylene nonwoven fabric There is.

In order to achieve the above object, the present invention is a polypropylene short fiber, the nonionic hydrophilic agent is attached to the surface of the melt-spun polypropylene 0.40 to 2.0 parts by weight of the nonionic hydrophilic agent with respect to 100 parts by weight of polypropylene Nonionic hydrophilic polypropylene short fibers are provided.

In the present invention, the polypropylene is a homopolypropylene, wherein the nonionic hydrophilic poly is characterized in that the melt index is 4 to 30 g / 10 min, the isotactic index is 90% or more, and the melting point is 160 to 165 ° C. measured by DSC. Provides propylene short fibers.

The present invention also provides a nonionic hydrophilic polypropylene short fiber, characterized in that the nonionic hydrophilic agent is made of polyethylene glycol (PEG).

In addition, the nonionic hydrophilic agent of the present invention provides a nonionic hydrophilic polypropylene short fiber formed by mixing a nonionic hydrophilic agent and an anionic hydrophilic agent.

In another aspect, the present invention is a method for producing a short polypropylene fiber, melting the polypropylene to form a composition; Spinning the composition at an extrusion temperature of 240 to 300 ° C. to produce undrawn yarn; Drawing the undrawn yarn at a draw ratio of 1.5 to 4.0; Crimping to impart crimp to the stretched fibers; Attaching a nonionic hydrophilic spinning oil to the surface of the crimped stretched yarn after applying the crimp; And heat-setting the stretched yarn to which the nonionic hydrophilic spinning oil is attached, and then cutting into short fibers of a predetermined length, thereby providing a method for producing nonionic hydrophilic polypropylene short fibers.

In the present invention, the polypropylene is a homopolypropylene, wherein the nonionic hydrophilic poly is characterized in that the melt index is 4 to 30 g / 10 min, the isotactic index is 90% or more, and the melting point is 160 to 165 ° C. measured by DSC. Provided is a method for producing propylene short fibers.

The present invention also provides a method for producing a nonionic hydrophilic polypropylene short fiber containing 0.40 to 2.0 parts by weight of the nonionic hydrophilic oil based on 100 parts by weight of the polypropylene.

The present invention also provides a method for producing a nonionic hydrophilic polypropylene short fiber, characterized in that the nonionic hydrophilic agent is made of polyethylene glycol (PEG).

In addition, the nonionic hydrophilic agent of the present invention provides a method for producing a nonionic hydrophilic polypropylene short fiber, characterized in that the nonionic hydrophilic agent and anionic hydrophilic agent is mixed.

The present invention also provides a nonionic hydrophilic polypropylene thermal bond nonwoven fabric prepared from the nonionic hydrophilic polypropylene short fibers.

The polypropylene short fiber manufactured by the present invention is used for the production of short fiber while maintaining the hydrophilicity compared to general hydrophilic polypropylene short fiber by treating the homopropylene resin with hydrophilic nonionic emulsion in the post-treatment process after melt spinning. There is an effect that the generation of static electricity is reduced even if it does not contain essentially the inhibitor or the antistatic agent is treated less than 0.05%.

In addition, the nonwoven fabric made of the nonionic hydrophilic polypropylene short fiber manufactured by the present invention has the effect of reducing the use of the antistatic agent while maintaining the hydrophilicity as compared to the general hydrophilic polypropylene nonwoven fabric by treating the nonionic emulsion having hydrophilicity. .

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, it should be noted that in the drawings, the same components or parts denote the same reference numerals as much as possible. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

The terms " about ", " substantially ", etc. used to the extent that they are used herein are intended to be taken to mean an approximation to or in the numerical value of the manufacturing and material tolerances inherent in the meanings mentioned, Accurate or absolute numbers are used to help prevent unauthorized exploitation by unauthorized intruders of the referenced disclosure.

In the present invention, in the polypropylene short fiber, a nonionic oil having a hydrophilic performance is attached to the surface of the polypropylene in which the polypropylene short fiber is melt-spun, and the nonionic hydrophilic oil is 0.40 to 100 parts by weight of the short polypropylene short fiber. It is preferable to contain 2.0 weight part. If the above range is exceeded, the bonding strength between fibers decreases when the nonwoven fabric is produced according to the thermal bonding method. If the range is less than the above range, the carding process before the thermal bonding is not smooth.

The present invention uses a nonionic hydrophilic agent, but may be used by mixing a portion of the anionic hydrophilic agent. As the nonionic hydrophilic oil, a spinning oil made of polyethylene glycol (PEG) as a base material is used. The anionic hydrophilic agent is a mixture of polyglycol esters based on polyethylene glycol (PEG) as the base material, and the anion component occupies a certain portion. As the anionic hydrophilic agent, a polyglycol ester was mixed with polyethylene glycol (PEG), of which an anion component accounts for 16%.

When mixed with 50% by weight of the nonionic hydrophilic agent and 50% by weight of the anionic hydrophilic agent can be obtained the result of close to the effect of using an antistatic agent when the post-treatment on the fiber.

The polypropylene is a homopolypropylene, it is preferred that the melt index (MI) of 4 to 30g / 10min, the isotactic index is 90% by weight or more and the melting point (Tm) measured by DSC is 160 to 165 ℃. The lower the melt index of the homopolypropylene can impart fiber stiffness, chemical resistance, and lower elongation, but the viscosity decreases, resulting in poor workability. If the melt index is too high, the stiffness of the fiber is lowered, and spinning Since it is difficult, it is suitable to have a melt index of 4 to 30.

One or more additives selected from the group consisting of antioxidants, UV stabilizers, process stabilizers, and colorants including white pigments may be optionally further included in the short polypropylene fibers, and the content of such additives may be 100% hydrophobic polypropylene short fibers. It is preferably included in 3 parts by weight or less with respect to parts by weight, and more preferably contained in 0.1 to 1.5 parts by weight. If the content is exceeded, the physical properties are inhibited.

In another embodiment of the present invention provides a method for producing the polypropylene short fibers. A non-drawn yarn is produced by spinning a polypropylene resin at a spinning temperature of about 250 ° C. and a spinning speed of 20 to 80 m / min. The unstretched yarn can be stretched to a preheating temperature of 50 to 100 ° C. by appropriately adjusting the draw ratio between 1.5 and 4.0 to impart crimping in the crimper.

After imparting the crimp, the spinning resin is dipped or sprayed into the liquid resin containing the hydrophilic nonionic spinning emulsion, so that the spinning emulsion is contained in an amount of 0.40 to 2.0 parts by weight based on 100 parts by weight of the polypropylene short fiber. Attach. After the drawn yarn was heat-set for about 8 to 12 minutes at a temperature of 100 ° C., the fiber was cut to have a length of 40 to 100 mm, and thus the final fiber fineness was 2.0 to 4.0 denier and an average elongation of polypropylene was set at 300 to 380%. Short fibers can be produced.

As another embodiment of the present invention provides a non-woven fabric produced by the thermal bond method of the short fibers prepared as described above. The thermal bond processing for manufacturing the nonwoven fabric may be performed using a calender bonding method and an air through bonding method.

The polypropylene short fiber obtained as an embodiment of the present invention is carded at a speed of 80 to 150mpm with a carding machine, a nonwoven web is produced, and passed through two hot rolls to obtain a calender-bonded nonwoven fabric having a basis weight of 25 gsm. Manufacture. In the calender bonding method, after the short fibers are carded, a web laminated on the conveyor is manufactured by passing heat between the fibers while passing between two hot rolls set at 140 to 165 ° C.

In the present invention, the thermal bond non-woven fabric was manufactured through a pilot calender bonding facility, and the hot roll temperature of hot roll was the most favorable for the non-woven fabric production speed, the shape of the embossed pattern of the roll, the difference between the roll setting temperature and the surface temperature, and the like. This is a relative result, not an absolute result, as it may vary depending on the production and equipment conditions of calender bonding method and the fineness of short fibers used as raw materials.

In the polypropylene fiber production equipment of the present invention, the antistatic agent is not treated separately after the homopolypropylene melt spinning to produce short fibers which can give the effect of reducing the generation of static electricity without the use of antistatic agents in the production of short fibers and nonwoven fabrics. Attempts have been made to adsorb nonionic hydrophilic emulsions onto the fibers.

In addition, in the present invention, when spraying a nonionic emulsion by using a spray to homopolypropylene to adsorb to the fiber surface, the production of static or non-woven fabric produced during the production even if the use of the antistatic agent used in the production of conventional hydrophilic polypropylene short fibers significantly reduced It has the effect of significantly reducing the generation of static electricity at the time, and shows the radioactivity without the generation of trimming or drop in the spinning process.

Hereinafter, embodiments of the present invention will be described in detail.

Example  One

(Production of Polypropylene Short Fiber)

Undrawn yarn was prepared by spinning a homopolypropylene resin at a spinning temperature of about 250 ° C. and a spinning speed of 40 m / min. The unstretched yarn was drawn at a draw ratio of 2.0 and a preheating temperature of 80 ° C. to impart crimping in the crimper, and sprayed a liquid resin containing a hydrophilic nonionic spinning emulsion in 100 wt parts of total fiber. The spinning oil is attached to the fiber surface so that 0.45 parts by weight of the resin is included. As the spinning oil, polyethylene glycol (PEG) spinning oil was used.

After heat-fixing the homopolypropylene having the spinning oil attached to the fiber surface at a temperature of 100 ° C. for 10 minutes, the fiber was cut to have a length of 40 mm and the final fiber fineness was 2.0 to 4.0 denier, and the average elongation was 300 to 380%. Polypropylene short fibers were produced as a target.

(Manufacture of nonwoven fabric)

The polypropylene short fibers obtained by the above method were carded with a carding machine at a speed of 80 to 150 mpm, a nonwoven web was produced, and passed between two hot rolls to prepare a calender bonded nonwoven fabric having a basis weight of 25 gsm.

At this time, while the temperature of the hot roll to 140 to 165 ℃ to find the optimum temperature of the non-woven fabric is excellent in the tensile strength of the most excellent heat fusion temperature (hereinafter referred to as the optimum hot roll temperature) to measure the physical properties.

Example  2

Work was carried out in the same manner as in Example 1, except that the hydrophilic nonionic anti-emulsion emulsion in the homopolypropylene resin was changed to include anionic hydrophilic agent in an equal ratio of 0.45% of the total short fiber weight. Polyglycol esters were mixed with polyethylene glycol (PEG) as the anionic hydrophilic agent, and an anionic component of which was used was 16%.

Example  3

Work was carried out in the same manner as in Example 1, except that the hydrophilic nonionic anti-emulsion emulsion and the antistatic agent in the homopolypropylene resin were changed to 0.41% and 0.04%, respectively, based on the total short fiber weight. Polyglycol esters were mixed with polyethylene glycol (PEG) as the anionic hydrophilic agent, and an anionic component of which was used was 16%.

Example  4

The operation was carried out in the same manner as in Example 2, but the discharge amount was adjusted so that the fineness of the final polypropylene short fibers was 2.2 denier.

Comparative example  One

The operation was carried out in the same manner as in Example 1, but was performed so that the anionic hydrophilic agent contained 0.45% by weight of the total short fiber weight without containing an antistatic agent in the existing hydrophilic spinning emulsion.

※ Analysis method

1. Melt Index (MI): According to ASTM D 1238

   * Homopolypropylene and random copolymer series: 230 ℃, 2.16kg load

   * PE series such as HDPE, LDPE: 190 ℃, 2.16kg load

2. Isotactic Index (II): ISO 9113: 1986 Plastics-Polypropylene (PP) and propylene-copolymer thermoplastics-Determination of isotactic index: Isotactic remaining after boiling the normal heptane to dissolve the atactic component The components are weighed and expressed in weight percent and this weight percent is called isotactic index.

3. Radioactivity: Evaluated by measuring the number of fiber breaks and the number of spin drops generated immediately under the detention of 32,410 holes.

         However, trimming or dropping is less than once / hour: ◎

         However, trimming or dropping is 1 ~ 3 times / time: ○

         Only three times / time of drop or drop: △

         No radiation: ×

4. Single fiber fineness: Measure fineness based on ASTM D1577

5. Non-woven carding property: When the short fiber passes through the carding machine, curling or flying occurs between the card rolls, or it is judged to be poor when the web formation is not good.

6. Basis weight: weight of nonwoven

7. Voltage measurement: Measured with a voltmeter on the nonwoven fabric guide bar immediately after calendar roll

8. Non-woven fabric static electricity measurement: Measure the non-woven fabric immediately after production by using the electrostatic measuring device 'SIMCO's FMX-003'

9. Uniformity: 1 (bad) ~ 5 (very good)

10. Settling time of short fibers: measured according to ERT (EDANA RECOMMENDED TEST METHODS) 10.3-99

11.Liquid absorbency time of nonwovens: measured according to ERT 10.4-02

The result table for the experiment is shown in Table 1 below.

division Spray amount of spinning oil (% by weight) Short fiber workability and physical properties Nonwoven Workability Nonwovens Properties Radioactive Island
(De) Shindo
(%) sedimentation
time Carding Leveling system Voltage measurement (V) static
(KV) sedimentation
time Example 1 0.45 ◎ 2.2 364.0 More than 3 hours Good 3 One 0.3 More than 3 hours Example 2 0.45 ◎ 2.2 362.0 More than 3 hours Extremely
Good 5 2 0.2 More than 3 hours Example 3 0.45 ◎ 2.2 356.0 More than 3 hours Good 5 2 0.4 More than 3 hours Example 4 0.45 ◎ 2.2 362.0 More than 3 hours Good 3 5 0.8 More than 3 hours Comparative Example 1 0.45 △ 2.0 370.0 More than 3 hours Bad 2 9 2.0 More than 3 hours

Experimental results show that when the nonionic hydrophilic agent and the anionic hydrophilic agent are mixed at 50:50 and then treated to the fiber, the result of using the antistatic agent can be obtained. Therefore, the cost can be reduced by not using the antistatic agent.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

Claims (10)

In polypropylene short fibers, A hydrophilic agent in which an anionic hydrophilic agent is mixed with a nonionic hydrophilic agent is attached to the surface of the melt-spun polypropylene. Nonionic hydrophilic polypropylene short fibers containing 2.0 parts by weight. The method of claim 1, The polypropylene is a homopolypropylene nonionic hydrophilic polypropylene short fiber, characterized in that the melt index is 4 to 30g / 10min, the isotactic index is 90% or more and the melting point is 160 to 165 ℃ measured by DSC. The method of claim 1, The nonionic hydrophilic oil is a nonionic hydrophilic polypropylene short fiber, characterized in that consisting of polyethylene glycol (PEG). delete In the method for producing polypropylene short fibers, Melting polypropylene to form a composition; Spinning the composition at an extrusion temperature of 240 to 300 ° C. to produce undrawn yarn; Drawing the undrawn yarn at a draw ratio of 1.5 to 4.0; Crimping to impart crimp to the stretched fibers; Attaching a hydrophilic agent in which anionic hydrophilic agent is mixed with a nonionic hydrophilic agent to the surface of the crimped stretched yarn after applying the crimp; And And heat-setting the stretched yarn to which the nonionic hydrophilic spinning oil is attached, and cutting the stretched yarn into short fibers of a predetermined length, wherein the short polypropylene fibers are anionic hydrophilic to the nonionic hydrophilic oil based on 100 parts by weight of polypropylene. A method for producing a nonionic hydrophilic polypropylene short fiber, comprising 0.40 to 2.0 parts by weight of a hydrophilic oil mixed with an oil agent. The method of claim 5, The polypropylene is a homopolypropylene, a melt index of 4 to 30 g / 10 min, an isotactic index of 90% or more and a melting point measured by DSC of 160 to 165 ℃ nonionic hydrophilic polypropylene short fiber manufacturing method. delete The method of claim 5, The nonionic hydrophilic oil is a non-ionic hydrophilic polypropylene short fiber manufacturing method, characterized in that consisting of polyethylene glycol (PEG). delete 10. A nonionic hydrophilic polypropylene thermalbonded nonwoven fabric made from the nonionic hydrophilic polypropylene short fibers according to any one of claims 1 to 9.