KR101646557B1 - Water easily soluble complex-fiber-derived polyester binder fiber for thin pape - Google Patents

Abstract

More particularly, the present invention relates to a polyester binder fiber derived from a water-soluble composite fiber, and more particularly, to a polyester binder fiber derived from a water-soluble composite fiber, which is capable of suppressing the crystallinity and orientation of the fibers forming the fiber, Soluble polyester binder fiber derived from a water-soluble complex fiber.

Description

[0001] The present invention relates to a polyester-based binder fiber,

More particularly, the present invention relates to a polyester binder fiber derived from a water-soluble composite fiber, and more particularly, to a polyester binder fiber derived from a water-soluble composite fiber, which is capable of suppressing the crystallinity and orientation of the fibers forming the fiber, Soluble polyester binder fiber derived from a water-soluble complex fiber.

Portable electronic communication devices such as mobile phones and notebook PCs are making remarkable progress. Accordingly, the demand for lithium secondary batteries as power sources capable of driving them has been increasing day by day.

Generally, the structure of a lithium secondary battery is composed of a positive electrode including a lithium-transition metal composite oxide, a negative electrode capable of intercalating and deintercalating lithium ions, a separator interposed between the positive and negative electrodes, and an electrolyte assisting the movement of lithium ions .

The conventional role of the separator is not only to isolate the positive electrode and the negative electrode but also to maintain the electrolyte solution to provide a high ion permeability. Korean Patent Application No. 2007-0119118 discloses a separator in which the surface of the separator is made of a hydroxyl group Thereby improving the performance of the secondary battery.

In addition, a separation membrane having a shutdown function that a part of the separation membrane is melted to block the pore to block the current when a large amount of current flows due to a partial short circuit or the like has recently been proposed. In addition, a technique of preventing contact between the electrode plates by increasing the area of the electrodes of the positive electrode and the negative electrode has been proposed. However, in this case, a function of preventing short- . Particularly, lithium secondary batteries, which require large-sized batteries and high energy density, are continuously maintained at a high charging / discharging state due to recent trends, so that the temperature in the battery rises. Therefore, heat resistance and thermal stability Is also required.

Conventionally, a porous membrane made of a sheet made of a polyolefin-based polymer such as polyethylene (PE) or polypropylene (PP) has been widely used. The separator made of polyethylene having a melting temperature of 130 ° C or polypropylene having a melting temperature of 170 ° C is heat-shrunk / melted due to a heat generated when an excessive current flows in the battery due to a short circuit or an external factor, In conjunction with this, the micropores are closed, thereby blocking current flow (shutdown).

However, in addition to the shutdown characteristic, the shape retention of the separator when the temperature rises continuously after shutdown becomes an important factor. However, when a separator having a melting temperature range such as polyethylene or polypropylene is used, if the temperature rises continuously due to internal or external factors after the shutdown, the separator itself melts and the separation of the separator is lost and the electrode is short- .

In recent years, attempts have been made to manufacture separators using polymers having a melting point higher than that of conventional polyolefin-based polymers as separation membranes. Due to their superior physical properties and cost advantages such as mechanical properties, electrical properties, heat resistance, dimensional stability and hydrophobicity Synthetic paper using polyester fibers as a part or all of the raw materials is being produced.

Conventionally, polyethylene fibers, polyvinyl alcohol fibers and the like have been used as the binder fibers in the polyester fiber as a synthetic paper-forming component. However, the binder fibers of these materials sometimes require a separate solvent, There is a problem of environmental pollution, and there is a problem that a binder melted in a solvent does not penetrate well to a synthetic paper forming component of a synthetic paper due to a compatibility problem between a polyester fiber and a binder fiber, resulting in insufficient adhesive strength.

Further, the binder fibers of the above-mentioned materials have problems in that the texture of the synthetic paper to be produced is roughened, and the working environment and facilities are often contaminated.

Accordingly, in recent years, a method of adhering fibers to each other by heating has been widely used in the production of synthetic paper. Especially, in consideration of compatibility, the same type of polyester is used as a binder fiber in many cases.

In the case of conventional polyester binder fibers, since the polyester polymer itself has a high melting point, studies have been continued in order to lower the softening point or melting point through polyester modification and utilize it as a binder fiber for synthetic paper.

However, since the polyester binder fibers for synthetic paper according to the present invention have a low melting point or a low softening point, the heat resistance of the polyester synthetic paper containing the modified polyester binder fibers is remarkably lowered. As a result, There is a problem in that it is difficult to be utilized as a large-capacity secondary battery separation membrane requiring stability.

On the contrary, polyester binder fibers for synthetic paper which are not modified have a high melting point of 200 ° C or higher, so that they do not cause any problems in terms of heat resistance. However, they can not serve as binders at a drying temperature of 150 ° C or lower, The strength of the paper can not be improved and the paper can not be completely dried. Thus, it is impossible to produce superfine synthetic paper having a very thin thickness.

SUMMARY OF THE INVENTION The present invention has been conceived in order to solve the problems as described above. The first problem to be solved by the present invention is to provide a fiber having a high melting point by suppressing the crystallinity and orientation of the fibers, Which is capable of exhibiting an adhesive strength and having a very high adhesive strength only by a low temperature drying process, and at the same time being capable of producing superfine paper with a low basis weight.

The second problem to be solved by the present invention is to provide a superficially formulated superabsorbent fiber having a significantly improved tear strength in spite of its low basis weight through a polyester binder fiber derived from a water-soluble composite fiber satisfying a specific condition according to the present invention A polyester fiber binder aggregate for superfine paper, a binder short fiber for superfine paper, and a fiber aggregate for superfine paper.

In order to solve the above-described first problem, the present invention provides a polyester binder fiber having a melting point of 200 ° C or higher, a strength of 1.9 g / d 'or less, an elongation of 112% And a crystallized area value (%) of 38% or less. The present invention also provides a superabsorbent polyester binder fiber derived from a water-soluble composite fiber.

[Relation 1]

Here, the area refers to the integral value of the crystallized region or the non-crystallized region measured by X-ray diffraction (XRD) analysis at 0 to 45 ° angle (2?) With respect to the polyester binder fiber.

According to a preferred embodiment of the present invention, the monodisperse fineness of the polyester binder fibers may be 0.001 to 0.5 denier.

According to another preferred embodiment of the present invention, the intrinsic viscosity of the polyester binder fiber may be 0.50 to 0.70 dl / g.

According to another preferred embodiment of the present invention, the polyester binder fiber may be an unstretched yarn.

According to another preferred embodiment of the present invention, the polyester binder fiber has a strength of 1.7 g / d 'or less, an elongation of 140% or more, a crystallized area value of the polyester binder fiber according to the relational expression (1) (%) May be 32% or less.

According to another preferred embodiment of the present invention, the polyester binder fiber may have a maximum load of 40 g · f / 15 mm or more at 130 ° C. according to the following measuring method 1, more preferably 55 g · f / It can be more than 15mm.

[Measurement method 1]

After forming a water base paper at a weight ratio of 6: 4, a polyester synthetic paper forming component (melting point: 255 占 폚, monosan diameter: 1.5 占 퐉) cut at 1.5 mm and a polyester binder (monosan diameter: 1.9 占 퐉) (MTM-001) to a grass (size 25cm × 25cm, weighing 1.76 g / ㎡) that was dried twice for 40 seconds at a temperature of 0 ° C.

According to another preferred embodiment of the present invention, the polyester binder fiber may have a strength of 1.20 g / d 'or more and an elongation of 205% or less.

According to another aspect of the present invention, And a polyester binder fiber for superfine paper according to the present invention soft-wound on the wood or paper tube.

In order to solve the above-mentioned second problem, the present invention provides a binder short fiber for superfold paper comprising a polyester binder fiber according to the present invention having a fiber length of 0.5 to 5 mm.

In order to solve the above-mentioned second problem, the present invention relates to a synthetic paper-forming fiber having a fiber length of 0.5 to 5 mm; And a binder short fiber for superfine paper according to the present invention.

According to a preferred embodiment of the present invention, the synthetic paper-forming fibers and the binder staple fibers for preparing super absorbent paper may be contained in a weight ratio of 8: 2 to 2: 8.

According to another preferred embodiment of the present invention, the synthetic paper-forming fibers may be polyester fibers.

Hereinafter, terms used in the present invention will be described.

The term " grassland " used in the present invention means a paper which has undergone drainage, dehydration, and / or drying without heat and / or pressure treatment as a pre-synthetic paper as a final paper.

The term " superfine paper " used in the present invention means grass paper having a low basis weight and means grass paper having a basis weight of 20 g / m 2 or less.

Since the polyester binder fiber derived from the water-soluble composite fiber of the present invention is capable of exhibiting a high adhesive force at a temperature significantly lower than the melting point even though the fibers having a high melting point are suppressed in crystallinity and orientation of the polymers forming the fibers It is possible to have a very high adhesive strength only at a low temperature drying process, at the same time to produce a superficially thin paper with a low basis weight, and to have a very high mechanical strength even if a synthetic paper produced through superfine paper is made to have a small thickness. The synthetic fiber including the polyester binder fiber for superfine paper of the present invention has excellent thermal properties such as heat resistance and minimizes deformation such as heat shrinkage even in a high temperature environment and is excellent in durability, And can be widely applied to medical and beauty tissues and the like.

1 is a cross-sectional view of a water-soluble composite fiber derived from a polyester binder fiber for superfine paper according to a preferred embodiment of the present invention.
2 is a schematic diagram of a weft holding device used in the manufacture of paper.
3 is a view illustrating a papermaking process according to a preferred embodiment of the present invention.

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

As described above, the binder fiber for a synthetic resin having a low melting point or a low melting point of polyester according to the conventional modification can exhibit an adhesive strength at a low temperature, but the thermal resistance of the polyester synthetic paper containing the polyester fiber is remarkably lowered There is a problem that it is difficult to be utilized as an application requiring high heat resistance and thermal stability. On the contrary, polyester binder fibers for synthetic paper which are not modified have a high melting point of 200 ° C or higher, so that they do not cause any problems in terms of heat resistance. However, they can not serve as binders at a drying temperature of 150 ° C or lower, The strength of the paper is weak and the paper is torn. As a result, there is a problem that it is impossible to produce a synthetic paper having a very thin thickness.

Accordingly, in the present invention, it is preferable that the melting point is 200 ° C or more, the strength is 1.9 g / de 'or less, the elongation is 112% or more, and the crystallized area value (%) of the polyester binder fiber according to the following relational expression (1) % Of the total weight of the polyester binder fibers for superfine paper. When the specific conditions of the present invention are satisfied with respect to the polyester fiber for superfine paper having a high melting point, it is possible to obtain a highly improved adhesive force only by drying at a low temperature and to exhibit improved mechanical strength even when producing grass with low basis weight .

[Relation 1]

In this case, the area refers to an integrated value for the crystallized region or the non-crystallized region measured by X-ray diffraction (XRD) analysis at 0 to 45 ° angle (2?) With respect to the polyester binder fiber.

Before explaining the polyester binder fiber for superfine paper according to the present invention, description will be made of the fiber-derived composite fiber.

1 is a cross-sectional view of a water-soluble composite fiber derived from a polyester binder fiber for superfine paper according to a preferred embodiment of the present invention, which comprises a sea component (40) containing a water-soluble polymer and a polyester binder fiber And a chart 41 including the islands.

Since the ultra-thin sheet having a basis weight of 5 g / m 2 or less has a thickness of 15 to 20 μm or less, it is required that the fibers included for manufacturing such super-sheet are also micro-fibers. However, since it is very difficult to radiate microfibers alone through ordinary chemical spinning, the current technology level is to reduce the amount of the usable polymer as a sea component by irradiating with the sea type conjugated fiber as shown in FIG. 1, Diameter fibers.

On the other hand, the inventors of the present invention have found that a polyester-binder fiber can be obtained through a sea-island complex fiber spun using an alkali-soluble polymer easily soluble in alkali instead of the water- As a result, it was confirmed that the polyester binder fibers derived from the composite fibers including the alkali-soluble polymer and the polyester binder fibers derived from the composite fibers including the water-soluble polymer exhibited unequal properties. This is because the condition for reducing the alkali-soluble polymer and the specific temperature and time conditions for reducing the water-soluble polymer differ depending on the specific kind of the polymer used, and the difference in these conditions is that the polymer forming the polyester- The difference in physical properties of the polyester binder fibers obtained after the reduction may occur due to the influence on the crystallinity and orientation of the polyester binder fibers.

Whether or not the polyester binder fibers are derived from the composite fibers containing any type of usable polymer is one of the factors determining the physical properties of the polyester binder fibers according to the present invention, Lt; RTI ID = 0.0 >

The polyester binder fiber for superfine paper according to the present invention, which will be described below, is assumed to be derived from a composite fiber comprising a water-soluble polymer and concrete conditions for enabling the present invention to exhibit desired properties will be described.

First, the melting point of the polyester binder fiber for superfine paper according to the present invention should be 200 ° C or higher.

If the polyester binder fiber has a melting point of 200 ° C or higher, there is no limitation on the specific type thereof, and the modified polyester fiber in which specific monomers in the polyester polymer are additionally substituted may be used without limitation from ordinary polyester fibers . According to a preferred embodiment of the present invention, the polyester binder fiber may have a melting point of 250 ° C or higher, and may be modified through the polyester binder fiber to lower the softening point and / or the melting point, It is possible to solve the problem of loss of heat resistance and has excellent thermal properties such as heat resistance and has a wide range of applications for applications requiring high heat resistance.

However, conventional polyester fibers have a problem that they have a difficulty in serving as a binder by adding a low temperature heat which is high in melting point and significantly lower than the melting point. Accordingly, the inventors of the present invention have achieved the following conditions, so that they have a melting point of 200 ° C or higher and have excellent heat resistance, and at the same time, they can exhibit their function as a superfine binder.

Specifically, in order to exhibit the performance as a binder at a temperature significantly lower than the melting point, it is preferable that the strength is 1.9 g / de 'or less, the elongation is 112% or more, and the crystallized polyester binder fiber according to the following relational expression (1) Area value (%) must satisfy 38% or less.

The crystallized area value (%) means the area of the total area measured at the time of X-ray diffraction (XRD) analysis for the polyester binder fiber, that is, the percentage of the crystallized area area relative to the total area of the crystallized area and the non- ), And can be expressed by the following relational expression (1).

[Relation 1]

The area of each region based on the calculation of the crystallized area value (%) according to the present invention is determined by measuring the area of the polyester binder fiber at 0 to 45 ° angle (2?) In the crystallization region measured in the X-ray diffraction (XRD) Is the integral value for the region.

The meaning of the crystallized area value (%) means a binder fiber having a higher degree of crystallinity as the crystallized area value is larger. As the crystallinity increases, physical properties such as mechanical strength, heat resistance, and chemical resistance can be improved. However, as the crystallinity increases, the adhesive strength may be lowered at a temperature lower than the melting point, or the adhesive force can not be exerted. Thus, there is a problem that it is difficult to function as the binder fiber, particularly, the binder fiber for superfiche paper.

The polyester binder fiber for superfine paper according to the present invention preferably has a crystallized area value (%) of not more than 38%, preferably a crystallized area value (%) of not more than 32% Despite the fact that it has excellent adhesion even when dried at a temperature of 150 ° C or lower, it does not cause tearing of the superficially peeled paper and satisfies the processability of the synthetic process, and has high heat resistance characteristic inherent in the final product after calendering Can also be present at the same time. If the crystallized area value exceeds 38%, the binder performance itself can not be exhibited at a low temperature, which is significantly lower than the melting point, so that it can not function as a binder fiber.

In addition, the polyester binder fiber for superfine paper according to the present invention simultaneously has a strength of 1.9 g / d 'or less and an elongation of 112% or more.

The strength and elongation of the fiber depend on the degree of crystallization of the polymer forming the fiber and the degree of orientation of the crystallized polymer. The present invention has the above-mentioned crystallized area value, while having a strength of 1.9 g / Should satisfy 112% or more to function as a binder fiber exhibiting desired physical properties. If the strength is greater than 1.9 g / d 'and / or the elongation is less than 112%, such fiber is a fiber having a large crystallized polymer value and a large crystallized area value and / or a crystallized polymer oriented in the fiber length direction, Is a fiber that has been subjected to a partial stretching or stretching process when the polymer crystallized in the longitudinal direction of the fiber is oriented in the longitudinal direction of the fiber, and the partial stretching or stretching process further exerts an external heat on the fiber, The desired physical properties may be more difficult to be expressed.

The polyester binder fibers satisfying the strength, elongation, and crystallized area values according to the present invention exhibit adhesion performance at a temperature significantly lower than the melting point. Accordingly, according to a preferred embodiment of the present invention, At a maximum load of 130 g · f / 15 mm or more at 130 ° C.

Specifically, the maximum load according to the above measurement method 1 will be described. First, a polyester synthetic paper forming component (melting point 255 캜, monocamera diameter 1.5 탆) cut at 1.5 mm and a polyester binder for monolith paper (Size: 25 cm x 25 cm, basis weight: 1.76 g / m < 2 >) that had been dried twice at a temperature of 130 DEG C for 40 seconds was mixed with a 6: -001), which is the maximum load measured.

According to a preferred embodiment of the present invention, the polyester binder fiber for superfine paper exhibits an adhesive performance such that the maximum load according to the above-described measuring method 1 is not less than 40 g · f / 15 mm, which is significantly higher than the melting point It means that the adhesive performance is exhibited at a low temperature condition of 130 DEG C and a short drying time. In addition, the grass produced by the measurement method 1 has a maximum load of 40 g · f / 15 mm or more, even though it has a basis weight of 1.76 g / m 2 and a basis weight of 25 cm × 25 cm. The polyester binder fiber according to the present invention is remarkably superior Mechanical strength is achieved.

However, according to a preferred embodiment of the present invention, polyester binder fibers have a density of 1.7 g / d 'or less and an elongation of 140% or more in order to further improve adhesion at low temperatures and to achieve improved adhesive strength. (%) Of the polyester binder fiber according to the relation (1) according to the present invention satisfies 32% or less, and the polyester binder fiber satisfying these conditions can be obtained by the above- A maximum load of 55 g · f / 15 mm or more can be satisfied at 130 ° C., more preferably 100 g · f / 15 mm or more, and even more preferably 130 g · f / 15 mm or more at 130 ° C., .

Still more preferably, the polyester binder fibers may have a strength of 1.2 to 1.9 g / de 'and an elongation of 112 to 205%. If the strength is less than 1.2 g / d 'and / or the elongation exceeds 205%, such polyester binder fibers can exhibit high adhesive strength, but the ease of spinning is very low and the productivity is significantly lowered.

On the other hand, in order to exhibit performance as a binder at a temperature significantly lower than the melting point, it has been described that it is important to maintain the low crystallinity of the polymers forming the binder fibers. Specifically, . That is, even after the spinning of the spinning binder fiber, the surface crystallization degree may be increased by external heat such as heat or heat accompanied by the drawing process, and the increase of the degree of crystallization may remarkably deteriorate the performance of the binder performance at the intended low temperature .

On the other hand, the orientation control of the polymer forming the fiber is carried out through a spinning-out process, which typically includes a step of applying heat, which can increase the surface crystallinity described above, Accordingly, the performance of binder performance at low temperatures can be remarkably lowered. Therefore, in order to exhibit desired physical properties, the crystallized area value of the polyester binder fibers must be low, and even if the binder fibers having a low crystallized area value are subjected to a separate drawing process to prevent further increase of the crystallized area value It is necessary to suppress the orientation of the polymer through the polymer. Accordingly, the polyester binder fiber for superfine paper according to the present invention may preferably be an unstretched fiber.

The polyester binder fibers for superfine paper according to the present invention having the crystallized area value (%) and the strength / elongation as described above may preferably have a Monosan fineness of 0.001 to 0.5 denier.

In the case of conventional polyester binder fibers for papers, there is a problem that it is very difficult to control the adhesive strength in the production of paper using microfine fibers of 0.6 denier or less. According to a preferred embodiment of the present invention, monodisperse fineness is 0.001-0.5 denier Even for superfine binder microfiber, it exhibits excellent adhesive strength and has the advantage that it has excellent durability.

In addition, the polyester binder fiber may have an intrinsic viscosity of preferably 0.50 to 0.70 dl / g, more preferably 0.55 to 0.67 dl / g. In the case of conventional polyester binder fibers for synthetic paper, a polyester resin having a viscosity of less than 0.5 dl / g is used for controlling the adhesive strength. However, in this case, it is difficult to maintain the adhesive strength and heat resistance constantly. Particularly, It has been difficult to control the adhesive strength even more when the paper is produced. However, even if the intrinsic viscosity is 0.5 dl / g or more, the present invention can satisfy both excellent adhesive strength and heat resistance, and may not cause problems such as adhesive strength even when producing synthetic paper using microfine fibers. However, it is desirable that the intrinsic viscosity does not exceed 0.70 dl / g. If it exceeds 0.70 dl / g, it may be difficult to secure the process rate of the mass production level and may require an additional process.

Further, in the case of the polyester binder fiber for superfine paper of the present invention, it may be a non-post-treated fiber such as cold rolling or heat fixing in the fiberizing process. In the case of conventional polyester binder fibers for synthetic paper, a separate process such as cold rolling or heat setting is further performed to improve the strength and shrinkage ratio after the spinning process. However, in the case of the binder fiber according to the present invention, It is preferable not to carry out a separate yarn processing step, and there is no need to go through a separate process, which simplifies the manufacturing process and has an advantage in reducing facilities and costs.

The polyester binder fiber according to the present invention as described above may be produced by: melting a polyester resin; And spinning the melted polyester resin.

The polyester resin may be used not only in a polyester resin used for a polyester binder fiber for synthetic paper but also a modified polyester resin, without limitation, and it may be added whether a specific monomer is added or not in the production of polyester. However, in order to have excellent heat resistance, the melting point (Tm) should be 200 ° C or more.

In addition, the polyester resin may have an intrinsic viscosity of preferably 0.50 to 0.70 dl / g, more preferably 0.55 to 0.67 dl / g. In the case of conventional polyester binder fibers, a polyester resin having a viscosity of less than 0.5 dl / g is used for controlling the adhesive strength. However, in this case, it is difficult to maintain the adhesive strength and heat resistance constantly. In particular, It is difficult to control the adhesive strength even more.

After the polyester resin is melted at a temperature equal to or higher than the melting point, the melted polyester resin is spun to produce a polyester binder fiber for superfine paper. The crystallized area value (%) of the polyester binder fiber according to the present invention The desired crystallized area value (%) can be obtained by simultaneously controlling factors such as temperature and spinning speed in the spinning process.

In the case of the nipping used for the above-mentioned spinning, a nipping which is usually used in the production of the polyester binder fiber can be used. However, in the case of the polyester binder fiber having a monosaccharide fineness of 0.001 to 0.5 denier according to a preferred embodiment of the present invention, since it is a microfine fiber, it is generally used in combination with a polyester fiber polymer in combination with a polyester fiber, And may be made of a conjugate fiber.

During the spinning process or after the spinning process, the binder fibers may not be subjected to separate treatment such as cold rolling or heat setting. In the case of the conventional polyester binder fiber for paper, a separate process such as cold rolling or heat setting is further performed to improve the strength and shrinkage after the spinning process. However, the present invention requires a separate process to improve the strength and shrinkage There is an advantage in that the manufacturing process is simplified, and facilities and costs are reduced.

The composite fiber produced through the above-described process can be obtained as a desired ultrafine polyester binder fiber through a weight reduction process.

The weight loss process may be performed by reducing the amount of the conjugated conjugated fibers to 50 to 300, and more preferably, by applying a twist of 20 to 100 to the conjugated conjugated fiber for the efficiency of the weight loss process. can do.

The weight loss process can be carried out by winding the twisted conjugated composite fiber into a branch tube or a wooden tube and immersing it in water. The branch pipe or the wood pipe may preferably be a quartz crucible and can be soft-rolled for easy elution during winding.

The weight loss during the weight reduction process may be performed at 40 to 80 ° C, and more preferably at 40 to 60 ° C. If the weight loss temperature exceeds 80 캜, the polyester binder fibers to be obtained by the high temperature may increase the surface crystallinity and the adhesive performance may be lost. Accordingly, the usable polymer which can be used in spinning with the conjugated fiber may not be able to smoothly carry out the weight loss process at low temperatures through the use of a water-soluble polymer in general. Therefore, It is preferable to use a water-soluble polymer capable of being used.

In addition, the weight loss time is preferably 60 to 120 minutes, and if the elution time exceeds 120 minutes, the polyester binder fibers to be obtained tend to be shrunk and the yield of the desired binder fibers may be significantly lowered as the weight loss efficiency is lowered. It may not be smooth and there may be a problem that dyeing becomes uneven when dyeing.

Meanwhile, the water-soluble composite fiber derived from the polyester binder fiber according to the present invention is wound around a wood or paper tube in the weight reduction process, and therefore, after the weight reduction process, only the polyester binder fiber for super- Lt; / RTI > Accordingly, the present invention relates to a wood or paper tube; And a polyester binder fiber for superfine paper according to the present invention soft-wound on the wood or paper tube.

The polyester binder fiber aggregate for superfine paper as described above may be further subjected to another process such as dispersion emulsion treatment. The dispersion emulsion treatment improves the dispersibility of the polyester binder fibers at a few pores in the production of papermaking paper, thereby further improving the adhesion of the polyester fibers as base fibers. The above-mentioned disperse emulsion can be preferably an aqueous dispersion emulsion, and it is not particularly limited in the present invention because it can use a conventional water-dispersible emulsion which is used in public in the art.

Thereafter, the polyester binder fibers may be subjected to a step of cutting into short fibers for ease of fabrication of the superficially fabric. At this time, 10 to 50 sums can be cut and then cut to improve the cutting efficiency, and the length of the cut short fibers may be 0.5 to 5 mm.

The binder short staple fibers may be blended with the synthetic paper forming fibers that are the base fibers of the synthetic paper to prepare superficial paper, which is the previous step for producing the synthetic paper. In this case, the synthetic paper-forming fibers may be polyester fibers for compatibility with the binder short fibers for superfine paper, the fiber length may be 0.5 to 5 mm, and the diameter may be 0.5 to 3 μm.

The synthetic paper-forming fibers form superfine fabric aggregates together with the binder short fibers for superfine paper, and the synthetic resin-forming fibers and the binder short fibers for preparing superfine paper are contained at a weight ratio of 8: 2 to 2: 8, It may be easy to produce superfine paper that can satisfy physical properties such as mechanical strength.

Hereinafter, the process for producing the synthetic paper according to one preferred embodiment using the polyester binder fiber for superfine paper according to the present invention will be described.

The synthetic paper according to a preferred embodiment comprises the steps of: (1) mixing a synthetic paper forming component and a polyester binder fiber for superfine paper according to the present invention to prepare a water base paper;

(2) drying the prepared water base paper to produce grass; And (3) calendering the grass produced by applying at least one of heat and pressure to the grass; . ≪ / RTI >

First, in step (1), a step (S100 in FIG. 2) of producing a water base paper by mixing the synthetic paper forming component and the polyester binder fiber for superfine paper according to the present invention is included.

The synthetic paper forming component (main fiber) may be polyester fibers which are preferably homogeneous for compatibility with the papermaking polyester binder fibers. However, the synthetic paper forming component is not limited to these, and may be a natural fiber such as a synthetic fiber or a cellulose . ≪ / RTI > The diameter (fineness) of the synthetic paper-like forming component may be varied depending on the intended use of the synthetic paper, and is not particularly limited.

The synthetic paper forming component and the binder fiber may be mixed in a fiber length of preferably 1 to 10 mm, and they may be dispersed in a solvent such as water at the time of mixing to form a water repellent paper. The mixing ratio of the synthetic paper forming component and the binder fiber may preferably be 1: 0.1 to 1 by weight based on the synthetic paper forming component in consideration of durability such as adhesion strength of the final synthetic paper.

A blending process may be further performed to uniformly mix the synthetic paper forming component and the binder fiber mixed in the solvent, and further various other substances such as a pH-adjusting substance, a forming aid, a surfactant, a defoaming agent and the like may be further added can do.

The water-base paper can be produced by using a paper machine, and the paper machine can be modified according to the purpose, not limited to paper machine such as paper machine, paper machine.

Specifically, the step before step (2) will be explained using the long-term storage device. FIG. 2 is a typical twin-screw type paper machine. Referring to FIG. 2, a synthetic paper manufacturing process will be described. A uniformly dispersed water base paper is filled in the head box 10. The weft needle extruded from the head box 10 is supported by the inner supporting wire net 20 and the outer feeding wire net 30 while passing through the two rollers 21 and 31 and the vacuum dewatering device through nozzles at the end, (1), and then transported outward along the external transferring wire net (30) to be formed into a felt, and then transferred to a drying device or the like for a drying step.

Next, in step (2), drying the prepared water-base paper to produce grass (S200 of FIG. 3).

The drainage process may be further performed before the drying process for the prepared water-based grass. Further, after the drainage process, the dehydration process may be further performed by vacuum or other pressure. The grass can be produced by evaporating the residual liquid using a similar apparatus known in the art for drying a drier, oven, or paper for drainage, dehydrated water-based papermaking.

Next, in step (3), a step (S300 in FIG. 3) of calendering the grass produced by applying at least one of heat and pressure is performed.

The pre-compression step prior to the calendering step may be further followed, where the heat and / or pressure may be achieved simultaneously by heating the rollers and applying pressure, or may be done by different processes. However, the heat treatment can be performed by any heating method such as a method of contacting paper on a metal roll or other high temperature surface, and can also be achieved by a conventional method such as heating the high temperature air in an infrared ray or oven. The heat applied can be determined in consideration of the synthetic paper forming component and the binder fiber, and is not particularly limited.

The present invention will now be described more specifically with reference to the following examples. However, the following examples should not be construed as limiting the scope of the present invention, and should be construed to facilitate understanding of the present invention.

≪ Example 1 >

First, a polyester chip containing polyethylene terephthalate having an intrinsic viscosity of 0.65 dl / g and polymerizing terephthalic acid (TPA) and ethylene glycol (EG) at a ratio of 1: 1.2 was charged into a first inlet of a melt- (WSP, TORAY CHEMICAL) chips were added to the second inlet, which was capable of 100% reduction in hot water at 50 ° C. The composite fiber was then spinning at a spinning speed of 2,100 mpm and a spinning temperature of 285 ° C. 100 of the above-mentioned composite fibers were folded together, and a 500TM twist was given through an industrial twisted yarn machine. The twisted conjugated conjugate fibers were soft-wound in a yarn core tube and subjected to a weight loss process at 50 占 폚 in hot water for 90 minutes to obtain superfine polyester fibers derived from conjugated conjugated fiber having a monosamtha fineness of 0.06 denier as shown in Table 1 below Binder fibers.

≪ Examples 2 to 8 &

The polyester binder resin for superfine paper as shown in Table 1 was prepared in the same manner as in Example 1 except that the melting point and intrinsic viscosity of the polyester resin were changed or the spinning speed was varied under the conditions shown in Table 1 below.

≪ Comparative Examples 1 and 2 &

The same procedure as in Example 1 was carried out except that the spinning speed of the polyester resin was varied under the conditions shown in Table 2 below to produce a polyester binder fiber for papermaking as shown in Table 2.

≪ Comparative Example 3 &

(ESP, TORAY CHEMICAL) was used in place of the copolyester used in the preparation of the water-soluble copolyester (ESP, TORAY CHEMICAL), 100 of the above-mentioned conjugated fibers were bundled, 500TM twist. The twisted conjugated composite fibers were soft-wound in a yarn core tube and subjected to a weight reduction process in an aqueous solution of 8 wt% NaOH at 50 캜 for 60 minutes to obtain a superabsorbent sheet derived from an alkali-utilizable composite fiber having a monosuspension degree of 0.06 denier To prepare a polyester binder fiber.

<Experimental Example 1>

The X-ray diffraction (XRD) analysis was performed on the polyester binder fibers prepared in the above Examples and Comparative Examples in order to measure the crystallized area value (%), and the crystallization region at 0 to 45 ° angle The integrated value for the non-crystallized region was calculated and the area value (%) crystallized according to the following relational expression 1 was calculated and shown in Tables 1 and 2 below.

 [Relation 1]

<Experimental Example 2>

In order to evaluate the strength and elongation of the polyester binder fibers, an automatic tensile tester (Textechno) was used at a speed of 50 cm / min and a gripping distance of 50 cm. Strength and elongation are the strength (g / de) divided by the denier (de) when the fiber is stretched until it is cut with a constant force, the strength, the percentage of the initial length as a percentage of the elongation, ) Were defined as elongation and are shown in Tables 1 and 2.

<Experimental Example 3>

In order to confirm the adhesive strength of the polyester binder fiber, a polyester synthetic paper-forming component (melting point: 255 占 폚, monocular diameter: 1.5 占 퐉) cut at 1.5 mm and a polyester binder for superfine paper cut at 1.5 mm ) Was dried at 130 DEG C for 40 seconds twice to prepare a grass having a size of 25 cm x 25 cm and a basis weight of 1.76 g / m &lt; 2 &gt;, and a hydraulic universal testing machine (MTM- 001) was used to measure the maximum load, and the results are shown in Tables 1 and 2 below.

<Experimental Example 4>

In order to evaluate the spinning workability of polyester binder fibers, a filtering test was performed on a melt spinning device whose size was reduced by 1/10 of the size of the yarn manufacturing process, and the measurement value of the meter reading paper of the pack pressure gauge and the frequency of threading were measured . When the workability was very good, it was marked as &quot; &quot;, and when the workability was deteriorated, the results were indicated in Table 1 and 2 as &amp; cir &amp;

Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Melting point (캜) 254 254 254 254 254 254 254 Intrinsic viscosity (dl / g) 0.65 0.65 0.65 0.65 0.65 0.65 0.65 The spinning speed (mpm) 2105 1300 1505 1805 2400 2680 3100 Crystallized area value (%) 22 5 13 16 27 30 36 Strength (g / de ') 1.40 1.03 1.15 1.29 1.64 1.69 1.82 Shinto (%) 183 257 221 194 162 144 112 Grassland toughness
(g · f / 15 mm) 134 230 195 160 105 65 30 Radiation workability ◎ △ △ ○ ◎ ◎ ◎

Comparative Example 1 Comparative Example 2 Comparative Example 3 Melting point (캜) 254 254 254 Intrinsic viscosity (dl / g) 0.65 0.65 0.65 The spinning speed (mpm) 3998 5000 2400 Crystallized area value (%) 41 43 29 Strength (g / de ') 2.04 3.65 1.22 Shinto (%) 94 32 104 Grassland toughness
(g · f / 15 mm) 7 0 20 Radiation workability ◎ ◎ ◎

Specifically, in Table 1, the heat resistance of Comparative Example 1 can be secured at a melting point of 200 ° C or higher, but the strength is more than 1.9 g / d ', the elongation is less than 112%, and the crystallized area value is 40% Accordingly, there is a problem that the adhesive strength is 7 g · f / 15 mm and thus it can not be used as a binder fiber.

In Comparative Example 2, although the heat resistance can be secured at a melting point of 200 ° C or higher, the strength is higher than 1.9 g / de ', the elongation is less than 112%, and the crystallized area value exceeds 40% 0 g · f / 15 mm, so that it can not be used as a binder fiber.

Comparative Example 3 is a binder fiber comprising an alkali-soluble polymer not derived from a conjugate fiber including a water-soluble polymer. As compared with Example 5, although spinning at the same spinning speed and similar crystallization area values It can be seen that the tear strength of the produced grass is remarkably low. It can be expected that the mechanical strength of the binder fiber is lowered due to the invasion of the binder component by the alkali.

Examples 1 to 6, which had strengths of 1.7 g / d 'or less, elongation of 140% or more and crystallized area values of 32% or less in Examples 1 to 7 satisfying the strength, elongation and crystallinity according to the present invention, It can be confirmed that the tearing strength is remarkably higher than that of Example 7 and the adhesion performance is remarkably excellent. However, it can be seen that Examples 2 and 3, in which the strength is less than 1.20 g / de 'and the elongation is more than 205%, can significantly lower the spinning workability as compared with Example 1. [

Claims (13)

(%) Of the polyester binder fibers according to the following relational expression (1) is less than or equal to 38%, a melting point of not less than 200 占 폚, a strength of not more than 1.9 g / A polyester binder fiber for superfine paper derived from a conjugated fiber.
[Relation 1]

Here, the area refers to the integral value of the crystallized region or the non-crystallized region measured by X-ray diffraction (XRD) analysis at 0 to 45 ° angle (2?) With respect to the polyester binder fiber.
The method according to claim 1,
Wherein the polyester binder fiber has a Monosan fineness of 0.001-0.5 denier. &Lt; RTI ID = 0.0 &gt; 11. &lt; / RTI &gt;
The method according to claim 1,
Wherein the polyester binder fiber has an intrinsic viscosity of 0.50 to 0.70 dl / g.
The method according to claim 1,
Wherein the polyester binder fiber is an unstretched fiber.
The method according to claim 1,
Wherein the polyester binder fiber has a strength of 1.7 g / d 'or less, an elongation of 140% or more, and a crystallized area value (%) of the polyester binder fiber according to the relational expression (1) Polyester binder fiber for superfine paper derived from a conjugated fiber.
The method according to claim 1,
Wherein the polyester binder fiber has a maximum load of not less than 40 g 占 15/15 mm at 130 占 폚 according to the following Measuring Method 1 as follows: Polyester binder fiber derived from a water-soluble complex fiber.
[Measurement method 1]
After forming a water base paper at a weight ratio of 6: 4, a polyester synthetic paper forming component (melting point: 255 占 폚, monosan diameter: 1.5 占 퐉) cut at 1.5 mm and a polyester binder (monosan diameter: 1.9 占 퐉) (MTM-001) to a grass (size 25cm × 25cm, weighing 1.76 g / ㎡) that was dried twice for 40 seconds at a temperature of 0 ° C.
6. The method of claim 5,
Wherein the polyester binder fiber has a maximum load of 55 g 占 f / 15 mm or more at 130 占 폚 according to the following Measuring Method 1 described below.
[Measurement method 1]
After forming a water base paper at a weight ratio of 6: 4, a polyester synthetic paper forming component (melting point: 255 占 폚, monofusia diameter: 1.5 占 퐉) cut into 1.5 mm and a polyester binder (monosan diameter: 1.9 占 퐉) (MTM-001) to a grass (size 25cm × 25cm, weighing 1.76 g / ㎡) which was dried twice for 40 seconds at a temperature of 0 ° C.
The method according to claim 1,
Wherein the polyester binder fiber has a strength of 1.20 g / de 'or more and an elongation of 205% or less.
Woodwinds or branches; And
The polyester binder fiber for superfine paper according to any one of claims 1 to 8, which is soft-wound on the wood or paper tube.
9. The binder short fiber for superfine paper according to any one of claims 1 to 8, which has a fiber length of 0.5 to 5 mm.
Synthetic paper forming fibers having a fiber length of 0.5 to 5 mm; And
11. A superfine fibrous aggregate comprising the superfine binder short fibers according to claim 10.
12. The method of claim 11,
Wherein the synthetic paper-forming fibers and the binder staple fibers for preparing superfine paper are contained in a weight ratio of 8: 2 to 2: 8.
12. The method of claim 11,
Wherein the synthetic paper-forming fibers are polyester fibers.

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