WO2015034109A1

WO2015034109A1 - Polyolefin based nonwoven fabrics comprising calcium carbonate, and preparation method therefor

Info

Publication number: WO2015034109A1
Application number: PCT/KR2013/007914
Authority: WO
Inventors: 박서진; 김동욱; 이승섭; 김경수
Original assignee: 도레이첨단소재 주식회사
Priority date: 2013-09-03
Filing date: 2013-09-03
Publication date: 2015-03-12
Also published as: CN105492671A; JP2016532019A

Abstract

The present invention relates to polyolefin based nonwoven fabrics comprising calcium carbonate, and a preparation method therefor. The preparation method, of the present invention, for the polyolefin based nonwoven fabrics comprising calcium carbonate corresponds to a method for preparing nonwoven fabrics by spinning and drawing a complex melt consisting of a polyolefin based resin and calcium carbonate, wherein the calcium carbonate, corresponding to a precipitated calcium carbonate, is produced by: eluting calcium ions by injecting an additive for calcium ion elution into a lime based by-product solution and, after elution, injecting a precipitating agent so as to sink the lime based by-product and thus separate an eluate from the by-product; thereafter, improving the reaction rate of the eluate and carbon dioxide by insufflating carbon dioxide in the course of transferring the eluate to a reaction tank; and maintaining, at all times, the concentration of calcium ions in the eluate at an appropriate level by adjusting the eluate, prepared in an elution tank, to have a pH of 12 or higher, and wherein the nonwoven fabrics is prepared by the steps of: forming a masterbatch consisting of the precipitated calcium carbonate and a polyolefin based synthetic resin; forming a fiber material composition by mixing a polypropylene fiber material with the masterbatch; forming a web by melt-spinning the fiber material composition; and thermally pressing the web. The polyolefin based nonwoven fabrics comprising calcium carbonate and the preparation method therefor, of the present invention, configured as above, use calcium carbonate for enhancing whiteness, and are highly environment-friendly by using and reacting, during the preparation process of the calcium carbonate being used, carbon dioxide generated in a steel mill, etc. In addition, since the prepared precipitated calcium carbonate has excellent spinning properties, a certain amount or more of polypropylene can be replaced with the calcium carbonate, and thus, production costs can be reduced.

Description

Polyolefin-based nonwoven fabric containing calcium carbonate and its manufacturing method

The present invention relates to a polyolefin nonwoven fabric containing calcium carbonate and a method for producing the same, and more particularly, to a polyolefin using pure hard calcium carbonate prepared by reacting lime-based by-products with carbon dioxide generated in a steelmaking process by a specific process. The present invention relates to a method for manufacturing a nonwoven fabric, in particular, pure calcium carbonate is used properly, so that a non-woven fabric having an excellent whiteness can be manufactured at a low cost, which can be effectively used for hygiene products such as diapers and sanitary napkins. It relates to a polyolefin nonwoven fabric comprising and a method for producing the same.

In general, nonwoven fabrics are widely used in a variety of industrial materials, such as sanitary, household goods, agriculture, filters, etc., the demand is increasing day by day. Among them, the spunbond nonwoven fabric is a nonwoven fabric made by spinning a chemical fiber.It is a kind of nonwoven fabric made by blowing a fiber from a nozzle on a conveyor that runs on a conveyor to form a long layer of fiber on the conveyor. There is also an advantageous advantage. Among these, polypropylene spanbonded nonwoven fabric has excellent characteristics such as economical efficiency, light weight, moldability, and chemical resistance, and thus, such as diapers, sanitary napkins, sanitary materials, home appliances, OA devices, packaging materials, automobile interior materials, disposable work clothes, etc. It is widely used to miscellaneous goods.

In particular, disposable sanitary products, such as diapers, sanitary napkins, etc., have been rapidly changed and improved in the structure of the sanitary material and the materials used therein, and the most important improvement of these improvements is the thinning of the sanitary material and the clean feeling of appearance. It can be said to improve the whiteness giving. Regarding the improvement of the whiteness, for example, in Korean Patent Publication No. 2011-0076154, "The polyolefin short fibers for hygiene products are composed of 70 to 97% by weight of polyolefin resin and 3 to 30% by weight of calcium carbonate. It is formed by spinning the melt and stretching the unstretched yarn, the polyolefin-based nonwoven fabric for the sanitary ware is formed of a blend of the polyolefin-based short fibers and pulp-derived fibers, so as to a polyolefin-based short fibers containing calcium carbonate The nonwoven fabric has a high whiteness, which gives a visually clean feeling and a high basis weight, which improves the volume, and by having a high tensile strength, improves durability, which is used as a surface material for hygiene products such as diapers, sanitary napkins, and wet wipes. Can provide consumers with good quality hygiene products. However, the conventional nonwoven fabric including calcium carbonate for improving the whiteness including the disclosed invention has a disadvantage in that it is practically difficult to use as a material for disposable hygiene products such as diapers or sanitary napkins due to an increase in the production cost according to productivity.

Moreover, in the situation where a large amount of thermoplastic polymer resins are consumed each year for the production of nonwoven products, the production cost of nonwoven fabrics is further increased due to the recent increase in the resin price, and thus the above problems are more severe. In other words, consumer demand for product quality is increasing, and the competitiveness of polypropylene spanbonded nonwoven fabrics is falling due to rising raw material prices.

On the other hand, in recent years, the implementation of the Climate Change Convention related to global warming has become a challenge, and the treatment of various harmful gases generated in steel mills has become a social and economic problem. In particular, emissions of carbon dioxide, one of the by-products of steel mills, are urgently needed to be resolved.

Therefore, the present inventors have recognized the above problems and researched ways to solve them. As a result, the use of by-products of steelworks, which are the above-mentioned problems in the production of nonwoven fabrics containing calcium carbonate, can solve both problems. The present invention has been devised, and thus, the present invention can be suggested to effectively implement the present invention.

[Preceding technical literature]

[Patent Documents]

Patent Document 1: Republic of Korea Patent Publication No. 2011-0076154

Accordingly, the present invention has been made in view of the above-described prior art level and the problems in these techniques, and the main purpose of the present invention is a spunbond nonwoven fabric used in the manufacture of sanitary articles such as diapers and sanitary napkins. It is to provide a polyolefin-based nonwoven fabric that can improve the whiteness and overcome the limitations of price competitiveness.

Another object of the present invention is to use the carbon dioxide generated in the filing station, etc. for the production of calcium carbonate added to the non-woven fabrics to reduce the carbon dioxide emissions and to provide an environmentally friendly product by using the calcium carbonate thus produced, having a high whiteness To provide a non-woven fabric that can implement a clear image of the hygiene products, and provide the price competitiveness of the spunbond nonwoven fabric.

Still another object of the present invention is to provide a manufacturing method which can more easily produce a nonwoven fabric having the above excellent characteristics.

The present invention may also be aimed at achieving, in addition to the above-mentioned specific objects, other objects which can be easily derived by those skilled in the art from this and the overall description of the present specification.

Method for producing a polyolefin-based nonwoven fabric comprising a calcium carbonate of the present invention for achieving the above object;

A method for producing a nonwoven fabric by spinning and stretching a composite melt composed of polyolefin resin and calcium carbonate, wherein the calcium carbonate is hard calcium carbonate, and the calcium ions are added to the lime-based by-product solution to elute calcium ions and elute them. After the sediment is added, the lime by-products are settled to separate the eluate and the by-products, and carbon dioxide is blown even while the eluate is transferred to the reaction tank, thereby improving the reaction rate between the eluate and the carbon dioxide, and always increasing the concentration of calcium ions in the eluate. Produced by maintaining at an appropriate level, the production of the nonwoven fabric;

Forming a masterbatch made of the hard calcium carbonate and a polyolefin-based synthetic resin; Mixing a polypropylene fiber with the masterbatch to form a fiber composition; Melt spinning the fiber composition to form a web; And heat pressing the web.

According to another configuration of the present invention, the formation of the masterbatch is 40 to 90% by weight of the hard calcium carbonate and 10 to 60% by weight of the polyolefin synthetic resin, more preferably 70 to 80% by weight of the hard calcium carbonate and the polyolefin synthetic resin 20 It is characterized by consisting of 30% by weight.

According to another configuration of the invention, the step of forming the fiber composition is characterized in that formed by mixing 5 to 40% by weight of the masterbatch, 60 to 95% by weight of polypropylene fiber.

According to another configuration of the present invention, the manufactured hard calcium carbonate has a whiteness of 80 or more, an average particle size of 5 μm or less, and a top cut of 15 μm or less, and more preferably hard calcium carbonate has a whiteness of: 90 or more, average particle size: 3㎛ or less, Top cut: characterized in that it has a good radioactivity characteristics compared to the conventional calcium carbonate, manufactured to less than.

According to another configuration of the present invention, it is characterized in that at least one or more of the same type of spunbond nonwoven fabric or meltblown nonwoven fabric is laminated on the spunbond nonwoven fabric.

Polyolefin-based nonwoven fabric comprising a calcium carbonate of the present invention for achieving the above another object;

A nonwoven fabric prepared by spinning and stretching a composite melt composed of polyolefin resin and calcium carbonate. The calcium carbonate is hard calcium carbonate, and calcium ions are added to a lime by-product solution to elute calcium ions to elute calcium ions. To separate the eluate and by-products by sedimenting the lime by-products, and then injecting the carbon dioxide even while transferring the eluate to the reaction tank to improve the reaction rate between the eluate and the carbon dioxide, and to make the eluate manufactured to pH 12 or more. By controlling the concentration of calcium ions in the eluate, the nonwoven fabric is produced by maintaining the proper level at all times. The nonwoven fabric forms a masterbatch made of the hard calcium carbonate and a polyolefin-based synthetic resin, and mixes the polypropylene fiber material with the masterbatch. To form a fiber composition, and Melt-spinning the fiber material composition to form a web, and then to the feature that the produced to have a high whiteness by hot-pressing the web.

According to another configuration of the present invention, the calcium ion eluting additive used is sodium trimethaphosphate, sodium hexametaphosphate, sodium polycarboxylic acid, ammonium polycarboxylic acid, sodium polycarboxylic acid, formic acid, succinic acid, sucrose fatty acid ester Sodium citrate, ammonium citrate, ammonium chloride, characterized in that it is used by mixing in one or two or more forms.

According to another configuration of the present invention, the settling agent is characterized in that the non-ionic and cationic or anionic properties of the polyacrylamide system are used or mixed.

Polyolefin-based non-woven fabric comprising a calcium carbonate of the present invention configured as described above and a method for producing the same are environmentally friendly by reacting with carbon dioxide generated in a steel mill in a calcium carbonate manufacturing process used to use calcium carbonate to enhance whiteness This high and excellent radioactive properties of the produced calcium carbonate can be replaced by more than a certain amount of polypropylene such calcium carbonate can reduce the production cost. In addition, the composition of the fiber composition containing the calcium carbonate, the melt spinning and heat pressing of the web is carried out by a consistent process, the excellent whiteness of the manufactured hard calcium carbonate is excellent in the clean feeling, such as hygiene products such as diapers, sanitary napkins Suitable for use

1 is a schematic diagram schematically showing a manufacturing process for producing a polyolefin-based nonwoven fabric comprising calcium carbonate according to a preferred embodiment of the present invention,

2 is a scanning electron microscope (SEM) photograph of a spunbond nonwoven fabric prepared according to Example 2, which is a preferred embodiment of the present invention.

3 is a Spunbond Nonwoven Scanning Electron Microscope (SEM) photograph of 100% by weight of polypropylene prepared in Comparative Example 1, which is a conventional method.

Hereinafter, the present invention will be described in more detail by preferred embodiments with reference to the accompanying drawings, but the scope of the present invention is not limited thereto.

According to a preferred embodiment of the present invention, in the preparation of the nonwoven fabric according to the present invention, a master batch made of calcium carbonate and a polyolefin synthetic resin, a fiber composition mixed with a polypropylene fiber material is melt-spun and a web is formed, and the web is heated. Provided is a polyolefin-based spanbonded nonwoven fabric which is formed by compression.

In addition, according to a preferred embodiment of the present invention, the calcium carbonate used according to the present invention uses calcium carbonate prepared by reacting with carbon dioxide produced in the steelmaking process, such calcium carbonate 40 to 90% by weight and polyolefin-based synthetic resin 10 Forming a masterbatch consisting of 70 wt% to 60 wt%, more preferably 70 wt% to 80 wt% of light calcium carbonate, and 20 wt% to 30 wt% of polyolefin-based synthetic resin; Mixing 5 to 40% by weight of the masterbatch and 60 to 95% by weight of polypropylene fiber to form a fiber composition; Melt spinning the fiber composition to form a web; And it provides a method for producing a spunbond nonwoven fabric comprising the step of hot pressing the web.

In addition, in the present invention, it is possible to provide a composite nonwoven fabric in which at least one of the same type of spanbonded nonwoven fabric or meltblown nonwoven fabric is laminated on the above-described spanbonded nonwoven fabric.

As described above, according to a preferred embodiment of the present invention, the spanbonded nonwoven fabric according to the present invention is produced using a fiber composition in which a masterbatch containing calcium carbonate and a polypropylene fiber are mixed as a raw material.

The calcium carbonate used in the present invention is produced from a commercialization process that can produce a high value-added hard calcium carbonate using lime-based by-products and at the same time use carbon dioxide generated in a steel company in a direct reaction to bring about a carbon dioxide reduction effect. Obtained. In addition, by adding an additive for elution of calcium ions, the calcium ion elution rate is not only improved, but after the elution, a sediment is added to allow sedimentation of the lime-based by-products to be precipitated, thereby rapidly separating the eluate and the by-products compared to the conventional method using the filter. Since carbon dioxide is blown even while the eluate is transferred to the reaction tank, the reaction rate between the eluate and the carbon dioxide is improved, and the eluate is adjusted to pH 12 or higher so that the concentration of calcium ions in the eluate can always be maintained at an appropriate level. In the reaction tank, only calcium carbonate produced by the reaction of the eluent and carbon dioxide is present, so that unreacted calcined oil does not exist after the completion of the reaction, so that the pH can be easily adjusted, and thus the particle size and specific surface area of the produced calcium carbonate can be controlled and excellent whiteness is achieved. Calcium carbonate can be produced.

The additives used for elution of calcium ions are sodium trimethaphosphate, sodium hexametaphosphate, sodium polycarboxylic acid, ammonium polycarboxylic acid, sodium polycarboxylic acid, formic acid, succinic acid, sucrose fatty acid ester, sodium citrate, ammonium citrate, chloride It can be used in mixture of 1 type, or 2 or more types in ammonium. Such additives serve to quickly dissolve calcium components in the lime-based by-products in water, and the additive mixing ratio is preferably 0.01 to 10.0% by weight based on 100% by weight of the lime-based by-products, preferably 0.03. To 2.0% by weight is suitable. In addition, the settling agent is suitable to use 0.01 to 3.0% by weight based on 100% by weight of the lime by-product, preferably 0.02 to 1.0% by weight, if the amount of the settling agent is less than 0.01% by weight does not occur smoothly If the amount of precipitation is more than 3.0% by weight, excessive flocculation occurs, which is disadvantageous for rapid elution of calcium ions. Such a precipitant may be used in combination or mixed with nonionic and cationic or anionic properties of polyacrylamide.

During the preparation process according to the invention the pH value before the eluent is added to the inside of the reaction tank is about 12 to 13, the calcium carbonate production reaction to terminate the reaction at the internal pH of 9.0, which is usually 9.0 If the pH is less than 9.0 at the completion of 10 or less, the redissolved calcium carbonate occurs, which is undesirable.

This uniform hard calcium carbonate will have better radioactivity than previous products. The prepared hard calcium carbonate has whiteness: 80 or more, average particle size: 5 μm or less, top cut: 15 μm or less, and has good radioactivity compared to conventional calcium carbonate, and more preferably, hard calcium carbonate Whiteness: 90 or more, average particle size: 3㎛ or less, Top cut: has a good radioactivity of hard calcium carbonate prepared to 10㎛ or less.

First, in order to include the calcium carbonate prepared as described above in the spunbond nonwoven fabric according to the present invention, for example, a master batch made of 75 to 90% by weight of calcium carbonate and 10 to 25% by weight of polyolefin-based synthetic resin is formed.

Specifically, 10 to 25% by weight of a polyolefin-based synthetic resin having a melt index of 20 to 80 g / 10 minutes selected from the group consisting of 75 to 90% by weight of hard calcium carbonate and polypropylene, polyethylene, etc., alone or in combination of two or more thereof A masterbatch is formed.

According to the present invention, it is preferable to use a polypropylene chip having a melt index (MI) of 20 to 80 g / 10 minutes in the production of a spunbond nonwoven fabric, when the melt index of the polypropylene chip is less than 20 g / 10 minutes. As a result, the melt viscosity is too high, and as a result, the sacrificial property is lowered, and when it exceeds 80 g / 10 minutes, the melt viscosity is too low and the radioactivity is lowered, which is not preferable because the stable operation is difficult.

In addition, the composite melt as a raw material of the spunbond nonwoven fabric according to the present invention is composed of 60 to 95% by weight of polypropylene resin and 5 to 40% by weight of the hard calcium carbonate masterbatch prepared above, preferably polypropylene resin 80 To 90% by weight, and 10 to 20% by weight of a hard calcium carbonate masterbatch. When the hard calcium carbonate master batch content is less than 5% by weight, the effect of increasing the whiteness of the nonwoven fabric and improving the price competitiveness is insufficient.If the hard calcium carbonate master batch content is more than 40% by weight, the radioactivity of the composite melt is poor. It is not preferable because there are problems such as deterioration of the physical properties of the nonwoven fabric.

Referring to the drawings, a method of manufacturing a spanbond nonwoven fabric according to the present invention will be described below.

1 is a schematic diagram schematically showing a manufacturing process for producing a polyolefin-based nonwoven fabric comprising calcium carbonate according to a preferred embodiment of the present invention.

In order to manufacture the nonwoven fabric, the polypropylene resin, which is first stored in a silo, is transferred to a raw material metering device for weighing raw materials and supplied to the extruder at a predetermined amount in an amount of 60 to 95% by weight. In addition, the masterbatch containing calcium carbonate is transferred to another raw material metering device and weighed by a predetermined amount at 5 to 40% by weight and supplied to the extruder. The feedstock and masterbatch supplied are melted and mixed in a hot extruder and spun through a mold consisting of a plurality of orifices, resulting in a fine thickness yarn of 10-30 μm. In the extruder, the melting temperature is maintained at 210 to 230 ° C. as the reference temperature, the temperature of the feed part supplied into the hot extruder is kept at 40 to 60 ° C. lower than the melting temperature of the melt part, and the temperature of the spinning part is 5 to 15 ° C. higher than the melting temperature. Hold to extrude and laminate the filaments to form a web.

If the melting temperature is less than 210 ° C, the fiber composition is not sufficiently melted. If the melting temperature is more than 230 ° C, the mechanical properties of the spanbonded nonwoven fabric formed from the fiber composition are lowered, which is undesirable. Therefore, the temperature is sequentially set by setting the temperature at which the fiber composition introduced into the spinning device is melted to 210 to 230 ° C. and maintaining the temperature of the supply part lower than the melting temperature while maintaining the temperature of the spinning part from which the fiber composition is spun higher than the melting temperature. To increase.

Based on the above temperature conditions, the filament is extruded by melt spinning, and the extruded filament is cooled and solidified by cooling air injected through a honeycomb-shaped c-ching chamber, and has a constant weight on the conveyor belt. Lamination is carried out. The formed web is combined with heat and pressure to impart mechanical properties and morphological stability. The calender rolls used for hot pressing of the web consist of an embossing roll having a bonding rate of 10 to 30% and a plate roll having a smooth surface. If the bonding rate is less than 10%, there is a disadvantage in that the formed web is insufficient in form stability, so that it cannot be applied as a nonwoven fabric. If the bonding rate is more than 30%, the film is excessively large and the touch is poor. The temperature which heat-presses a web with a calender roll is 130-170 degreeC.

The basis weight of the produced polypropylene spunbond nonwoven fabric was 10 to 120 gsm and a thickness of 0.05 to 0.7 mm. If the basis weight of the polypropylene spunbond nonwoven fabric is less than 10 gsm, and the thickness is less than 0.05 mm, the physical properties of the nonwoven fabric are deteriorated, and in particular, it is difficult to economically produce such as lower productivity in low weight production, and the basis weight is more than 120 gsm. When the thickness exceeds 0.7mm, there is a problem that it is difficult to apply to hygiene or household goods due to the excessively thick and low flexibility and poor touch.

Hereinafter, the present invention will be described in more detail based on the following examples. However, the following examples are only for illustrating the present invention in detail, and do not limit the present invention.

Various properties and physical properties in the following Examples and Comparative Examples were measured and evaluated in the following manner.

(1) Weight: EDANA 40.3-90

(2) Tensile strength and Elongation: EDANA 20.2-89

(3) Bending Length: EDANA 50.5-99

(4) Hydrostatic Head: DIN53886

(5) Radioactivity: Evaluated by observing the number of fiber trimming and spinning drop occurrence during spinning

-Trimmed or dropped 3 times / hour: good

-Trimming or dropping 3 to 10 times / hour: normal

-No trimming or drop 10 times / time or no radiation: Bad

Example 1

75% by weight of hard calcium carbonate and 25% by weight of polypropylene chips were mixed and stirred to form a masterbatch. 5% by weight of the master batch and 95% by weight of polypropylene chips are mixed to form a fiber composition. The fiber composition is injected into a spinning device and spun through a mold consisting of a plurality of orifices to extrude the filaments. The filament was extruded by maintaining the melting temperature of the spinning device at 220 ° C, maintaining the temperature of the supply part at 170 ° C, and the temperature of the spinning part at 225 ° C. The extruded filaments were solidified by the cooling air injected in the c-ching chamber, stretched by the pressure of the air injected from the top and the air sucked from the lower part of the conveyor belt to form a web by laminating on the conveyor belt.

The web was heat-compressed at a temperature of 158 ° C. and a pressure of 68 dyne / cm in a calender roll consisting of an emboss roll and a smooth surface plate roll to form a spanbond nonwoven fabric.

Example 2

A nonwoven fabric was prepared in the same manner as in Example 1, except that 20 wt% of the masterbatch and 90 wt% of the polypropylene chip were mixed to use a fiber composition.

Example 3

A nonwoven fabric was prepared in the same manner as in Example 1, except that 30 wt% of the masterbatch and 80 wt% of the polypropylene chip were used to mix the fiber composition.

Comparative Example 1

A nonwoven fabric was prepared in the same manner as in Example 1 except that the polypropylene chip 100 wt% fiber composition was used.

Comparative Example 2

50% by weight of the masterbatch and 50% by weight of polypropylene chip were mixed in the same manner as in Example 1 using the fiber composition, but the spinning was very poor (trimming occurred), and the pressure in the screen stayer filter was increased. It was not possible to produce a spunbond nonwoven fabric.

The composition of the spunbond nonwoven fabric prepared according to Examples 1, 2, and 3 and Comparative Examples 1 and 2 described above, and the radioactive, weight, and tensile strength properties during melt spinning were evaluated. Shown in

Table 1

division	Hard calcium carbonate master batch (wt%)	Polypropylene (% by weight)	weight	Tensile strength (kgf / 5cm)		Radioactive
division	Hard calcium carbonate master batch (wt%)	Polypropylene (% by weight)	weight	MD	CD	Radioactive
Example 1	5	95	15	3.4	1.45	Good
Example 2	20	80	15	3.0	1.3	Good
Example 3	30	70	15	2.7	1.1	Good
Comparative Example 1	-	100	15	3.5	1.5	Good
Comparative Example 2	50	50	-	-	-	Poor (non-woven fabric cannot be manufactured)

As shown in Table 1, when the hard calcium carbonate masterbatch content exceeded 40% by weight, the radioactivity was poor, and thus a spunbond nonwoven fabric could not be prepared. In addition, as the content of calcium carbonate increases, the tensile strength was found to decrease.

FIG. 2 is a scanning electron microscope (SEM) photograph of the spunbond nonwoven fabric prepared in Example 2 according to the present invention, and FIG. 3 is a polypropylene 100 wt% spunbond nonwoven scanning electron microscope (SEM) prepared in Comparative Example 1 It is a photograph. As can be seen in Figure 2 it can be seen that the hard calcium carbonate particles protrude on the surface of the non-spun bond fabric, and showed a different characteristic from the surface of the span bond non-woven fabric made of only the polypropylene resin of FIG.

Although the invention has been described in detail only with respect to the specific embodiments and examples described, it will be apparent to those skilled in the art that various modifications and variations are possible within the spirit of the invention, and such modifications and modifications fall within the scope of the appended claims. Is a matter of course.

Claims

A method for producing a nonwoven fabric by spinning and stretching a composite melt composed of polyolefin resin and calcium carbonate, wherein the calcium carbonate is hard calcium carbonate, and the calcium ions are added to the lime-based by-product solution to elute calcium ions and elute them. After the sediment is added, the lime by-products are settled to separate the eluate and the by-products, and carbon dioxide is blown even while the eluate is transferred to the reaction tank, thereby improving the reaction rate between the eluate and the carbon dioxide, and always increasing the concentration of calcium ions in the eluate. Produced by maintaining at an appropriate level, the production of the nonwoven fabric;

Forming a masterbatch made of the hard calcium carbonate and a polyolefin-based synthetic resin; Mixing a polypropylene fiber with the masterbatch to form a fiber composition; Melt spinning the fiber composition to form a web; And Method of producing a polyolefin-based nonwoven fabric comprising calcium carbonate, characterized in that it is produced by the step of hot pressing the web.
The method of claim 1, wherein the master batch is formed of 40 to 90% by weight of the hard calcium carbonate and 10 to 60% by weight of a polyolefin-based synthetic resin.
The method of claim 1, wherein the step of forming the fiber composition of the polyolefin-based non-woven fabric containing calcium carbonate, characterized in that formed by mixing 5 to 40% by weight of the masterbatch, 60 to 95% by weight of polypropylene fiber Manufacturing method.
The method of claim 1, wherein the prepared calcium carbonate has a whiteness: 80 or more, an average particle size: 5㎛ or less, Top cut: 15㎛ or less has a good radioactivity characteristics compared to conventional calcium carbonate A method for producing a polyolefin nonwoven fabric containing calcium carbonate.
The method of claim 4, wherein the hard calcium carbonate prepared has a whiteness: 90 or more, an average particle size: 3㎛ or less, Top cut: 10㎛ or less characterized in that it has better radioactivity than conventional calcium carbonate. A method for producing a polyolefin nonwoven fabric containing calcium carbonate.
The method of manufacturing a polyolefin-based nonwoven fabric comprising calcium carbonate according to claim 1, wherein at least one spunbond nonwoven fabric or a meltblown nonwoven fabric of the same type is laminated on the spunbond nonwoven fabric.
A nonwoven fabric prepared by spinning and stretching a composite melt composed of polyolefin resin and calcium carbonate. The calcium carbonate is hard calcium carbonate, and calcium ions are added to a lime by-product solution to elute calcium ions to elute calcium ions. To separate the eluate and by-products by sedimenting the lime by-products, and then injecting the carbon dioxide even while transferring the eluate to the reaction tank to improve the reaction rate between the eluate and the carbon dioxide, and to make the eluate manufactured to pH 12 or more. By controlling the concentration of calcium ions in the eluate, the nonwoven fabric is produced by maintaining the proper level at all times. The nonwoven fabric forms a masterbatch made of the hard calcium carbonate and a polyolefin-based synthetic resin, and mixes the polypropylene fiber material with the masterbatch. To form a fiber composition, and Melt-spinning the fiber material composition to form a web, and a polyolefin-based nonwoven fabric that comprises the following: calcium carbonate according to the characteristics that produced so as to have a high whiteness by hot-pressing the web.
The method of claim 7, wherein the additive used for elution of calcium ions is sodium trimethaphosphate, sodium hexametaphosphate, sodium polycarboxylic acid, ammonium polycarboxylic acid, sodium polycarboxylic acid, formic acid, succinic acid, sucrose fatty acid ester, citric acid A polyolefin-based nonwoven fabric comprising calcium carbonate, characterized by being used in one or two or more forms of sodium, ammonium citrate, and ammonium chloride.
8. The polyolefin-based nonwoven fabric according to claim 7, wherein the precipitation agent is a polyacrylamide-based nonionic, cationic or anionic one or a mixture thereof.