KR100662775B1 - Hydrophilic polypropylene staple fiber, method for preparing the same, and hydrophilic polypropylene spunlace nonwoven prepared therefrom - Google Patents

Abstract

A hydrophilic polypropylene staple fiber, a method for manufacturing the same, and a hydrophilic polypropylene spunlace nonwoven fabric manufactured by the same are provided to reduce generation of foam in processing the hydrophilic polypropylene staple fiber into a spunlace nonwoven fabric, and maintain hydrophilic property after water washing. A hydrophilic polypropylene staple fiber includes 0.2-5.0 weight% of a hydrophilic additive inside the fiber. 0.2-1.0 weight% of spinning oil is attached to a surface of the hydrophilic polypropylene staple fiber. The spinning oil includes a nonionic surfactant, anionic anti-static agent, and a non-silicon antiforming agent.

Description

HYDROPHILIC POLYPROPYLENE STAPLE FIBER, METHOD FOR PREPARING THE SAME, AND HYDROPHILIC POLYPROPYLENE SPUNLACE NONWOVEN PREPARED THEREFROM

[Industrial use]

The present invention relates to a hydrophilic polypropylene short fiber, a method for producing the same, and a hydrophilic polypropylene spunlace nonwoven fabric prepared therefrom, and more particularly, to a hydrophilic polypropylene short fiber excellent in hydrophilic durability and easy to manufacture nonwoven fabric, It relates to a process for producing the same, and to a hydrophilic polypropylene spunlace nonwoven fabric prepared therefrom.

[Private Technology]

Polypropylene has the advantage of having a unique low melting point, low specific gravity, excellent chemical resistance and relatively low price compared to other materials, while its application is very limited due to its strong hydrophobicity.

Conventional polypropylene short fibers have been mainly used as surface materials for hygiene products such as diapers, sanitary napkins, etc., mainly due to thermal bond nonwoven processing due to their low melting point and excellent chemical resistance.

On the other hand, wipe products, which are made mainly through the spunlace nonwoven process, use hydrophilic short fibers such as cotton and viscose rayon as raw materials, and short polypropylene short fibers are suitable as raw material fibers for such wipe products due to their high hydrophobicity. It was myth that I could not.

Many methods of imparting hydrophilicity to hydrophobic polypropylene fibers have been studied, but the effect of the hydrophobic polypropylene fibers is insignificant or the compatibility with polypropylene causes problems and deterioration of physical properties in the spinning or stretching process.

In particular, in order to impart hydrophilicity to the surface of the polypropylene short fibers, there is a method of attaching an emulsion or the like, but such an emulsion generates bubbles by water used as a medium of the nonwoven fabric entanglement, thereby reducing the entanglement efficiency or circulating water. There is a problem that makes the water purification process difficult. In addition, the hydrophilicity of the short polypropylene fiber is difficult to sustain as the emulsion component attached to the surface is washed off with water.

The technique of imparting hydrophilicity to hydrophobic polyolefin or polypropylene fiber is as follows.

Japanese Patent Laid-Open No. 2-169774 has proposed a method of attaching a hydrophilic surfactant such as polyester-modified silicone or sorbitan fatty acid ester to the surface of a hydrophobic fiber. In this case, however, 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 during the spunlace treatment. In addition, foaming occurs during the spunlace treatment, which causes deterioration of entanglement and makes water purification difficult.

International Patent Publication WO 00 / 0071789A1 describes a method for producing hydrophilic polypropylene fibers by mixing-melting one or more fatty acid monoglycerides having 8 to 16 carbon atoms having a glyceride content of 80% by weight or more into hydrophobic fibers. The surface migration of fatty acid monoglycerides is not only shortening the duration of hydrophilicity, but also has a disadvantage in that it is difficult to melt blend with the masterbatch processing and polypropylene resin because the surfactant has a liquid phase.

Japanese Patent Application Laid-Open No. 2-221448 proposes a hydrophilic nonwoven fabric consisting of 3 to 10% by weight of fatty acid monoglyceride having 12 or more carbon atoms and 3 to 15% by weight of polyvinyl alcohol or polyamide. have. However, the composite fiber is too high in the content of fatty acid monoglycerides, and must contain a large amount of polyvinyl alcohol or polyamide, so the manufacturing cost is high, and the composite fiber is limited to the manufacturing equipment because it can be applied only to the composite spinning equipment.

In particular, the prior art described above is not considered at all for the foam reduction techniques required in the spunlace nonwoven process. Therefore, there has been no research on hydrophilic polypropylene fibers which are relatively inexpensive and have durable hydrophilic properties, particularly hydrophilic polypropylene fibers which are suitable for the spunlace nonwoven fabric due to their low foaming properties.

The present invention is to solve the above problems, an object of the present invention is to provide a hydrophilic polypropylene short fibers suitable for the spunlace process having a durable hydrophilicity and less foaming.

Another object of the present invention is to provide a method for producing the hydrophilic polypropylene short fibers.

Another object of the present invention is to provide a hydrophilic polypropylene spunlace nonwoven fabric which is prepared using the hydrophilic polypropylene short fibers and is suitable for wipe products.

In order to achieve the above object, the present invention comprises 0.2 to 5.0% by weight of the hydrophilizing additive in the fiber, and includes 0.2 to 1.0% by weight of the spinning emulsion attached to the surface, the spinning emulsion is a nonionic surfactant, anion Provided is a hydrophilic polypropylene short fiber comprising an antistatic agent and a non-silicone antifoaming agent.

The present invention also includes melt blending a polypropylene resin and a hydrophilization additive; Spinning the melt mixture to produce undrawn yarn; Drawing the unstretched yarn and attaching a spinning oil to the surface of the unstretched yarn; And after heat-setting the stretched yarn, it provides a method for producing a hydrophilic polypropylene short fiber comprising the step of cutting into short fibers.

The present invention also provides a hydrophilic polypropylene spunlace nonwoven fabric prepared from the above hydrophilic polypropylene short fibers.

Hereinafter, the present invention will be described in more detail.

Hydrophilic polypropylene short fibers for producing nonwoven fabric of the present invention comprises 0.2 to 5.0% by weight of the hydrophilization additive, more preferably 0.8 to 5.0% by weight, 0.2 to 1.0% by weight of the spinning oil attached to the surface Include.

The hydrophilization additive is to impart durable hydrophilicity without impairing the physical properties of the polypropylene short fibers, spinning workability, and stretching workability, and in order to obtain a sufficient hydrophilic sustaining effect, the content of the hydrophilization additive is a hydrophilic poly 0.2 wt% or more should be included in the propylene short fiber weight, and it is preferable to include 5.0 wt% or less in order to prevent spinning workability, stretching workability, and physical property deterioration of short fibers.

However, the optimum amount of the hydrophilic additive is changed depending on the thickness of the final fiber, because the thin fiber has a large specific surface area compared to the thick fiber, the thinner the more the amount of the hydrophilic additive can be obtained the optimum effect.

The hydrophilization additive included in the hydrophilic polypropylene short fiber of the present invention is included in the melt blended state in the polypropylene short fiber, the hydrophilic additive is a) monoglycerin fatty acid ester, and b) polyglycerol fatty acid ester at the same time It is preferable to include, and more preferably comprises a) monoglycerin fatty acid ester, and b) polyglycerin fatty acid ester in a weight ratio of 10:90 to 90:10.

The monoglycerol fatty acid esters have a relatively high surface migration compared to polyglycerol fatty acid esters when melt-blended in short polypropylene fibers, thus affecting the initial hydrophilicity of the fibers. Therefore, when the content of the monoglycerin fatty acid ester is 10 or more, it is possible to impart proper initial hydrophilicity to the short polypropylene fiber, and when the content of the polyglycerol fatty acid ester is 10 or more, impart an appropriate hydrophilic sustaining effect to the polypropylene short fiber. can do.

In the glycerin fatty acid ester included in the hydrophilic additive of the present invention, only one fatty acid is combined with glycerol, collectively referred to as 'monoglyceride'.

The purity of the monoglycerin fatty acid ester used in the present invention may be represented by the content (% by weight) of the monoglyceride represented by the following formula (1), the purity of the polyglycerol fatty acid ester of the monoglyceride represented by the formula (2) It can be expressed by content (% by weight).

[Formula 1]

[Formula 2]

In the above formula, each R is independently a saturated or unsaturated hydrocarbon having 8 to 22 carbon atoms,

n is an integer from 1 to 9.

The higher the monoglyceride content represented by Formula 1 in the monoglycerin fatty acid ester of the present invention, the better the hydrophilicity of polypropylene short fibers, and the higher the monoglyceride content represented by Formula 2 in the polyglycerol fatty acid ester, the more hydrophilic. The sustaining effect of can be increased.

Therefore, in order to give effective hydrophilicity and sustain the hydrophilic effect, the monoglyceride content of the monoglycerin fatty acid ester is preferably 80 to 100% by weight, more preferably 90 to 100% by weight, and the monoglyceride of the polyglycerin fatty acid ester It is preferred that the ride content is 40 to 100% by weight, more preferably 90 to 100% by weight.

The monoglycerin fatty acid ester of Formula 1 may be obtained by esterifying a vegetable fatty acid with glycerin, and the polyglycerol fatty acid ester of Formula 2 may be obtained by esterifying a fatty acid on a polyglycerol polymerized with glycerin.

Preferred examples of the monoglycerin fatty acid esters include one or more selected from the group consisting of glycerin mono laurate, glycerin mono palmitate, glycerin mono stearate, and glycerin mono oleate, and preferred examples of the polyglycerol fatty acid ester There is at least one selected from the group consisting of diglycerin mono laurate, diglycerin mono palmitate, diglycerin mono stearate, and diglycerin mono oleate.

The hydrophilicity of the hydrophilic polypropylene resin increases as the degree of polymerization n of the polyglycerol fatty acid ester increases, and as the carbon number of R in the fatty acid moiety decreases. However, when the carbon number of the R is small, the durability (durability) of hydrophilicity may be lowered.

The polypropylene resin may optionally further include one or more additives selected from the group consisting of antioxidants, UV stabilizers, process stabilizers, and colorants, including white pigments, the content of such additives being total hydrophilic polypropylene short fibers. It is preferably contained in less than 2% by weight, more preferably from 0.1 to 1.5% by weight.

In the hydrophilic polypropylene short fiber for manufacturing nonwoven fabric of the present invention, when the content of the spinning oil satisfies the range of 0.2 to 1.0% by weight based on the total weight of the hydrophilic polypropylene short fiber, suitable electrical properties and frictional force in the fiber drawing process and the carding process It can effectively impart hydrophilicity, and can prevent foaming in the nonwoven fabric manufacturing process by spunlace.

The spinning emulsion comprises a nonionic surfactant, an anionic antistatic agent, and a non-silicone antifoaming agent, preferably a) 70 to 85 wt% of the nonionic surfactant, b) 5 to 15 wt% of the anionic antistatic agent, and c) 5 to 15% by weight of the non-silicone antifoaming agent. The content range is to limit the specific composition range for the generation of bubbles in the production of spunlace nonwovens while maintaining the properties of the spinning oil.

The nonionic surfactant included in the spinning oil is preferably at least one selected from the group consisting of polyethylene polypropylene glycol mono butyl ether, polyoxyethylene sorbitan trioleate, and polyoxyethylene oleic acid ester.

The anion antistatic agent is preferably a polyoxyethylene alkyl phosphate salt containing an alkyl group having 8 to 18 carbon atoms, and the phosphate salt is selected from the group consisting of sodium salt, potassium salt, triethylamine salt, and monoethylamine salt. It is more preferable that it is 1 or more types.

The non-silicone antifoaming agent is at least one selected from the group consisting of polyoxyalkylene glycol, poly (oxyethylene, oxypropylene) alkyl ether, poly (oxyethylene, oxypropylene) glycol copolymer, and polyoxyalkylene triol It is preferable.

The hydrophilic polypropylene short fibers for nonwoven fabric manufacturing preferably have a sinking time of 3 to 10 seconds, measured according to ERT (EDANA RECOMMENDED TEST METHODS) 10.3-99.

In addition, 25 g of short fibers were placed in a beaker containing 250 ml of demineralized water at 75 ° C., followed by water bathing for 20 minutes, followed by dehydration of the short fibers in a centrifuge, followed by complete drying for 30 minutes in a 120 ° C. oven. After leaving for time, it is preferred that the sinking time measured according to ERT 10.3-99 is 3 to 15 seconds. The shorter the settling time, the better the hydrophilicity.

In addition, the hydrophilic polypropylene short fiber for manufacturing nonwoven fabric of the present invention was measured by stretching a sample having a length of 40 mm using a 2.5 N load cell at a speed of 50 mm / min using an Instron 4601 model. Is preferably from 60 to 250%.

In addition, in the hydrophilic polypropylene short fiber for nonwoven fabric of the present invention, 25 g of short fiber is placed in a beaker containing 250 ml of demineralized water at 75 ° C., followed by water bathing for 7 minutes, dehydration of the short fiber, and 10 ml of the obtained water is collected and a test tube After shaking vigorously up and down for 5 seconds, it is preferable that the bubble height maintained at the time of 10 second passes is 0-10 mm, and it is more preferable that it is 0-5 mm. The height of the foam is most preferably 0 mm but at most 10 mm or less is suitable for the spunlace process.

However, the manufacturing process of the hydrophilic polypropylene short fibers of the present invention comprises the steps of melt mixing a polypropylene resin, and a hydrophilization additive; Spinning the melt mixture to produce undrawn yarn; Drawing the unstretched yarn and attaching a spinning oil to the surface of the unstretched yarn; And after heat-setting the drawn yarn, it is preferable to include a step of cutting into short fibers.

The polypropylene resin used in the production method of the present invention has a melt index (MFR) of 4 to 30 measured according to ASTM-D-1238 (230 ° C., 21.2 N) and an isotactic index of 93 according to ISO 9113. It is preferably from 99% by weight. However, the content of the present invention is not limited only to the above range. The lower the melt index of the polypropylene resin, the more rigidity, chemical resistance and low elongation of the fiber can be imparted, but the lower the viscosity, the poorer the workability. If the melt index is too high, it is difficult to spin and thus has a melt index of 4 to 30. It is best suited for fiber spinning.

In addition, the isotactic index should be 93 wt% or more to obtain short fibers having excellent polypropylene crystallinity and rigidity, and polypropylene having more than 99 wt% is practically difficult to commercialize.

In the present invention, the spinning oil deposition process is not particularly limited since it is a conventional method, but is preferably attached to the surface of the fiber by an oil roller, an oil jet, dipping, or a spray method during the stretching process of the polypropylene fiber.

In addition, the step of melt-mixing the hydrophilic additive with a polypropylene resin is pre-processed in the form of a masterbatch easy to melt blending, and then added to the polypropylene resin to improve the dispersibility of the additive and uniform quality Can be achieved.

The spinning emulsion of a preferred embodiment of the present invention described above exhibits the desirable properties intended by the present invention as a total effect when the components contained therein are combined in the above-mentioned amounts. Therefore, it is difficult to accurately and individually grasp the technical effect of each component in the spinning oil.

The durable hydrophilic polypropylene short fibers obtained from the present invention not only generate less foam during spunlace nonwoven fabrics, but also have hydrophilicity after spunlace (water washing) to produce spunlace nonwoven fabrics using hydrophilic polypripropylene short fibers as a raw material. can do. The manufacturing process of the nonwoven fabric is the same as the manufacturing process of the conventional spunlace nonwoven fabric, and in the present invention, the manufacturing process is not particularly limited.

The spunlace nonwoven fabric prepared from the short fibers preferably has a settling time of 15 seconds or less, as measured according to ERT 10.4-02.

The spunlace nonwoven fabric of the present invention can be used for a variety of wiper products such as infants, adults, wet towels, automobiles, kitchens, industrial wipers, and the like, surface materials such as disposable diapers and sanitary napkins, and the density per unit area of the spunlace nonwoven fabric. Since it can adjust suitably according to a use, it does not specifically limit, It is suitable for the said use that it is 20-250 g / m <^2> .

However, if the various emulsion compositions prepared in the following Examples and Comparative Examples are reviewed, it is possible to estimate the effect of each component. The following examples are only preferred embodiments of the present invention, and the present invention is not limited by the following examples.

EXAMPLE

Preparation Example 1

Preparation of Hydrophilic Polypropylene Masterbatch A1

40 g of glycerin mono stearate (GMS) having a monoglyceride content of 90% by weight was added to 60 g of a polypropylene resin having a melt index (MFR) 12 and an isotactic index of 96% by weight, followed by melt mixing. This 2 mm, length was cut to 3 mm to prepare a hydrophilic polypropylene masterbatch (A1).

Preparation Example 2

Preparation of Hydrophilic Polypropylene Masterbatch (A2)

Melt Index (MFR) 12, 60 g of polypropylene resin having an isotactic index of 96% by weight, 20 g of glycerin mono stearate (GMS) having a monoglyceride content of 90% by weight, and 90% by weight of monoglyceride content 20 g of phosphorus diglycerin mono stearate (DMS) was added and melt mixed, and then cut into 2 mm in diameter and 3 mm in length to prepare a hydrophilic polypropylene masterbatch (A2).

Preparation Example 3

Preparation of Hydrophilic Polypropylene Masterbatch (A3)

60 g of a polypropylene resin having a melt index (MFR) of 12 and an isotactic index of 96 wt%, 40 g of a diglycerin mono stearate (DMS) having a monoglyceride content of 90 wt%, followed by melt mixing mm, length was cut to 3 mm to prepare a hydrophilic polypropylene masterbatch (A3).

Preparation Example 4

(Production of a spinning oil (F1))

50 g of polyethylene polypropylene glycol mono butyl ether as a nonionic surfactant, 20 g of polyoxyethylene sorbitan trioleate, and 13 g of polyoxyethylene oleic acid ester, 7 g of polyoxyethylene stearyl phosphate triethanol amine salt as an anion antistatic agent , 10 g of polyoxyalkylene glycol polyalkylene glycol which is a nonionic antifoaming agent was mixed to prepare a spinning oil (F1).

Preparation Example 5

(Production of Hydrophilic Spinning Oil (F2))

General hydrophilic mixture of 40 g of polyoxyethylene lauryl ether, 20 g of polyethylene glycol monocoate, 15 g of polyoxyethylene alkyl phosphate salt, 10 g of dialkyl sulfosuccinate salt, and 15 g of betaine type zwitterionic surfactant A spinning oil (F2) was prepared.

Example 1

(Production of Hydrophilic Polypropylene Short Fiber)

The melt index (MFR), 95 g of polypropylene resin having an isotactic index of 96% by weight and 5 g of the hydrophilic polypropylene masterbatch (A2) prepared in Preparation Example 2 were melt-blended and extruded at a spinning speed of 80 m / min. 2.3 Undrawn yarn of denier was prepared.

The unstretched yarn was stretched at a draw ratio of 2.2 and a preheating temperature of 60 ° C. to impart crimping in a crimper. The spinning emulsion was attached to the fiber surface so that the content was 0.35% by weight based on the total weight of the short fibers, and after heat setting at 120 ° C., the fibers were cut to 51 mm in length so that the final fiber fineness was 1.5 denier and the elongation was Hydrophilic polypropylene short fibers of 150% were prepared.

(Production of Hydrophilic Polypropylene Spunlace Nonwoven Fabric)

A hydrophilic polypropylene short fiber obtained by the above method was carded to form a fibrous web, and a spunlace nonwoven fabric of 60 g / m ² was manufactured through a spunlace process through six waterjet injectors.

Example 2

Same as Example 1, except that the melt index (MFR), 90 g of polypropylene resin having an isotactic index of 96% by weight, and 10 g of the hydrophilic polypropylene masterbatch (A2) prepared in Preparation Example 2 were melt-blended. The method produced hydrophilic polypropylene short fibers and a hydrophilic polypropylene spunlace nonwoven fabric.

Comparative Example 1

Short polypropylene and polypropylene spunlace nonwoven fabrics were produced in the same manner as in Example 1 except that 100 g of polypropylene resin was used without adding a hydrophilic polypropylene masterbatch (A2).

Comparative Example 2

Polypropylene short fibers, and polypropylene in the same manner as in Comparative Example 1, except that the hydrophilic spinning oil (F2) prepared according to Preparation Example 5 instead of the spinning oil (F1) was sprayed into a 10.0% by weight aqueous emulsion. A spunlace nonwoven fabric was produced.

Comparative Example 3

Example 1 except that a melt index (MFR), 90 g of polypropylene resin having an isotactic index of 96% by weight and 10 g of a hydrophilic polypropylene masterbatch (A1) prepared according to Preparation Example 1 were melt-blended. In the same manner, hydrophilic polypropylene short fibers and a hydrophilic polypropylene spunlace nonwoven fabric were prepared.

Comparative Example 4

Comparative Example 2 and except that melt index (MFR) 24, 90 g of polypropylene resin having an isotactic index of 96% by weight and 10 g of hydrophilic polypropylene masterbatch (A1) prepared according to Preparation Example 1 In the same manner, hydrophilic polypropylene short fibers and a hydrophilic polypropylene spunlace nonwoven fabric were prepared.

Comparative Example 5

Same as Comparative Example 2 except that the melt index (MFR), 95 g of polypropylene resin having an isotactic index of 96% by weight, and 5 g of the hydrophilic polypropylene masterbatch (A2) prepared in Preparation Example 2 were melt-blended. The method produced hydrophilic polypropylene short fibers and a hydrophilic polypropylene spunlace nonwoven fabric.

Comparative Example 6

Same as Comparative Example 2, except that melt index (MFR) 24, 90 g of polypropylene resin having an isotactic index of 96% by weight, and 10 g of the hydrophilic polypropylene masterbatch (A2) prepared in Preparation Example 2 were melt-blended. The method produced hydrophilic polypropylene short fibers and a hydrophilic polypropylene spunlace nonwoven fabric.

Comparative Example 7

Same as Example 1, except that the melt index (MFR), 90 g of polypropylene resin having an isotactic index of 96% by weight, and 10 g of the hydrophilic polypropylene masterbatch (A3) prepared in Preparation Example 3 were melt-blended. The method produced hydrophilic polypropylene short fibers and a hydrophilic polypropylene spunlace nonwoven fabric.

Comparative Example 8

Same as Comparative Example 1, except that melt index (MFR) 24, 90 g of polypropylene resin having an isotactic index of 96% by weight, and 10 g of the hydrophilic polypropylene masterbatch (A3) prepared in Preparation Example 3 were melt-blended. The method produced hydrophilic polypropylene short fibers and a hydrophilic polypropylene spunlace nonwoven fabric.

For the polypropylene short fibers and polypropylene spunlace nonwoven fabrics prepared according to Examples 1 and 2 and Comparative Examples 1 to 8, the sinking time of the melt index, the short fibers and the nonwoven fabric, according to the following criteria, And foaming was measured.

* Melt Index (MFR) (ASTM-D-1238, 230 ℃, 21.2N)

* Settling time of short fibers: Measured according to ERT (EDANA RECOMMENDED TEST METHODS) 10.3-99 and can be considered hydrophilic if the fibers are placed in a metal net on the water surface and settle below the surface within about 15 seconds.

* Re-sinking Time of Staple Fibers:

25 g of short fibers were placed in a beaker containing 250 ml of demineralized water at 75 ° C., followed by water bathing for 20 minutes. The short fibers were dehydrated with a centrifuge, placed in an oven at 120 ° C., completely dried for 30 minutes, and left at standard conditions for 2 hours. After that, measure according to ERT 10.3-99.

* Liquid absorbency time of Nonwovens: Measured according to ERT 10.4-02.

* Foam of short fibers: 25g of short fibers in a beaker containing 250 ml of demineralized water at 75 ° C., followed by water bathing for 7 minutes, dehydrating the short fibers, taking 10 ml of the obtained water, and putting it in a test tube up and down for 5 seconds. After shaking vigorously, the bubble height maintained after 10 seconds has been measured in mm. Generally, when the height of the bubble is 2 mm or less, it can be regarded as good foaming.

* Foaming of the spunlace process: After 1 hour operation of the spunlace nonwoven fabric manufacturing process, take 10 ml of circulating water before entering the water purification equipment, put it in a test tube and shake it up and down vigorously for 5 seconds to increase the bubble height after 10 seconds. Measure in mm. Also in this case, when foam height is 2 mm or less, it can be considered that foamability is good.

The structure and physical properties of the polypropylene short fibers and the polypropylene spunlace nonwoven fabric prepared according to Examples 1 and 2 and Comparative Examples 1 to 8 are summarized in Table 1 below.

TABLE 1

Hydrophilic additive Spinning oil Short Fiber Properties Properties of Nonwovens Kinds Added amount (% by weight) F1 (% by weight) F2 (% by weight) Settling time (seconds) Settling time after cleaning (seconds) Foaminess (mm) Settling time (seconds) Foamability of Spunlace Process (mm) Example 1 (GMS + DMS) 2 0.35 - 9 10 0 11 0 Example 2 (GMS + DMS) 4 0.35 - 6 8 0 10 0 Comparative Example 1 - - 0.35 - 13 > 3 days 0 > 3 days 0 Comparative Example 2 - - - 0.35 3.8 > 3 days 85 > 3 days 32 Comparative Example 3 GMS 4 0.35 - 6 20 0 28 0 Comparative Example 4 GMS 4 - 0.35 3.8 19 99 22 37 Comparative Example 5 (GMS + DMS) 2 - 0.35 3.6 14 95 15 35 Comparative Example 6 (GMS + DMS) 4 - 0.35 3.2 9 108 13 39 Comparative Example 7 DMS 4 0.35 - 15 18 0 22 0 Comparative Example 8 DMS 4 - 0.35 3.7 20 101 23 40

In Table 1, GMS means glycerin mono stearate, and DMS means diglycerine mono stearate.

As shown in Table 1, in Examples 1 and 2 using the hydrophilic masterbatch (A2) and the spinning oil (F1), the hydrophilic durability is high, and the foam of the short fibers and the foam of the spunlace process are very low. Able to know.

On the other hand, the short fibers of Comparative Examples 1 and 2, in which the hydrophilic masterbatch was not added, showed a strong hydrophobicity with a sinking time of 3 days or more, and the hydrophilicity was easily lost as the radioactive oil dropped by the washing. .

In addition, in the case of Comparative Examples 3 to 8 using hydrophilic masterbatches (A1 to A3), some hydrophilic durability was maintained, but Comparative Examples 2, 4 to 6, and 8, in which general hydrophilic spinning oil F2 was attached to the fiber surface In the case of high foaming it can be seen that it is not suitable for the spunlace nonwoven fabric manufacturing process.

In addition, in the case of Comparative Examples 3 and 7 using only one type of the monoglycerin fatty acid ester and the polyglycerol fatty acid ester, respectively, and using the spinning oil (F1), it showed some hydrophilic durability and low foaming, It can be seen that the hydrophilic polypropylene short fibers and nonwoven fabrics prepared according to 1 and 2 do not fall short.

 The hydrophilic polypropylene short fibers obtained from the present invention not only generate less foam when processing the spunlace nonwoven fabric, but also have hydrophilicity after spunlace (water washing), thereby making a spunlace nonwoven fabric made from hydrophilic polypripropylene short fibers as a raw material. have.

Claims (15)

0.2 to 5.0 wt% of a hydrophilization additive inside the fiber, 0.2 to 1.0 wt% of an anti-emulsion agent attached to the surface, The radioemulsion agent is a hydrophilic polypropylene short fiber that comprises a nonionic surfactant, an anionic antistatic agent, and a non-silicone antifoaming agent. The method of claim 1, wherein the hydrophilization additive a) monoglycerine fatty acid ester having a monoglyceride content of 80 to 100% by weight, and b) polyglycerin fatty acid ester having a monoglyceride content of 40 to 100% by weight Hydrophilic polypropylene short fibers for the production of nonwoven fabrics comprising a by weight ratio of 10:90 to 90:10: [Formula 1]

[Formula 2]

In the above formula, each R is independently a saturated or unsaturated hydrocarbon having 8 to 22 carbon atoms, n is an integer from 1 to 9. The method of claim 1, wherein the hydrophilic polypropylene short fibers further comprises at least one additive selected from the group consisting of antioxidants, ultraviolet stabilizers, and colorants, including white pigments, hydrophilic polypropylene for manufacturing nonwoven fabrics. fiber. The method of claim 1, wherein the spinning emulsion a) 70 to 85 weight percent of nonionic surfactant, b) 5 to 15% by weight of anionic antistatic agent, and c) 5 to 15% by weight of non-silicone antifoaming agent Hydrophilic polypropylene short fibers for manufacturing nonwoven fabrics comprising a. The method of claim 1, wherein the nonionic surfactant is at least one member selected from the group consisting of polyethylene polypropylene glycol monobutyl ether, polyoxyethylene sorbitan trioleate, and polyoxyethylene oleic acid ester, The anion antistatic agent is a polyoxyethylene alkyl phosphate salt containing an alkyl group having 8 to 18 carbon atoms, and the phosphate salt is one selected from the group consisting of sodium salt, potassium salt, triethylamine salt, and monoethylamine salt. That's it, The non-silicone antifoaming agent is at least one selected from the group consisting of polyoxyalkylene glycol, poly (oxyethylene, oxypropylene) alkyl ether, poly (oxyethylene, oxypropylene) glycol copolymer, and polyoxyalkylene triol Hydrophilic polypropylene short fibers for the production of phosphorous nonwovens. The method of claim 1, wherein the hydrophilic polypropylene short fibers are hydrophilic polypropylene short fibers for manufacturing nonwoven fabrics having a sinking time of 3 to 10 seconds measured according to ERT (EDANA RECOMMENDED TEST METHODS) 10.3-99. The method of claim 1, wherein the hydrophilic polypropylene short fiber is a non-woven fabric having an elongation of 60 to 250% measured by stretching a sample having a length of 40 mm at a rate of 50 mm / min using a 2.5 N load cell (Load cell) Hydrophilic Polypropylene Short Fiber. According to claim 1, The short hydrophilic polypropylene fibers 25g 25g in a beaker containing 250 ml of demineralized water at 75 ℃ in water for 20 minutes, and then dehydrated in a centrifuge, the single fibers in a 120 ℃ oven After 30 minutes of complete drying, and standing for 2 hours at standard conditions, the hydrophilic polypropylene short fiber for manufacturing nonwoven fabric having a sinking time of 3 to 15 seconds measured according to ERT 10.3-99. According to claim 1, The short hydrophilic polypropylene fibers 25g 25g in a beaker containing 250ml of demineralized water at 75 ℃ in water for 7 minutes, dehydrated the short fibers, 10ml of the obtained water is collected and the test tube A hydrophilic polypropylene short fiber for producing nonwoven fabric having a foam height of 0 to 10 mm held after 10 seconds elapses after vigorously shaking up and down for 5 seconds. Melt mixing the polypropylene resin and the hydrophilization additive; Spinning the melt mixture to produce undrawn yarn; Drawing the unstretched yarn and attaching a spinning oil to the surface of the unstretched yarn; And Heat-setting the stretched yarn and cutting the short fibers into short fibers Method for producing a hydrophilic polypropylene short fiber comprising a. The polypropylene resin according to claim 10, wherein the polypropylene resin has a melt index (MFR) of 4 to 30 measured according to ASTM-D-1238 (230 ° C, 21.2 N), and an isotactic index of 93 to 100 measured according to ISO 9113. A process for producing hydrophilic polypropylene short fibers for producing nonwoven fabrics of 99% by weight. The method of claim 10, wherein the hydrophilization additive a) monoglycerine fatty acid ester having a monoglyceride content of 80 to 100% by weight, and b) polyglycerin fatty acid ester having a monoglyceride content of 40 to 100% by weight Method of producing a hydrophilic polypropylene short fibers for the production of nonwoven fabric comprising a in a weight ratio of 10:90 to 90:10: [Formula 1]

[Formula 2]

In the above formula, each R is independently a saturated or unsaturated hydrocarbon having 8 to 22 carbon atoms, n is an integer from 1 to 9. The method of claim 10, wherein the spinning emulsion a) 70 to 85 weight percent of nonionic surfactant, b) 5 to 15% by weight of anionic antistatic agent, and c) 5 to 15% by weight of non-silicone antifoaming agent Method for producing a hydrophilic polypropylene short fibers for manufacturing nonwoven fabrics comprising a. A hydrophilic polypropylene spunlace nonwoven fabric made from the hydrophilic polypropylene short fibers according to any one of claims 1 to 9. 15. The hydrophilic polypropylene spunlace nonwoven fabric of claim 14, wherein the spunlace nonwoven fabric has a settling time of 15 seconds or less, as measured according to ERT 10.4-02.