KR20190030622A - Polypropylene resin composition, polypropylene resin compact and method for manufacturing polypropylene resin compact - Google Patents

Abstract

A purpose of the present invention is to provide a polypropylene resin composition, a polypropylene resin molded article and a method for manufacturing the polypropylene resin molded article which can be dyed by dyes. The polypropylene resin composition of the present invention comprises polypropylene which is unmodified and a maleic anhydride-modified polypropylene which is compatible with polypropylene which is unmodified, and the graft modification ratio of maleic anhydride in maleic anhydride-modified polypropylene is 1.50 to 2.50 mass%.

Description

TECHNICAL FIELD [0001] The present invention relates to a polypropylene resin composition, a polypropylene resin molded article, and a method for producing a polypropylene resin molded article,

TECHNICAL FIELD The present invention relates to a polypropylene resin composition, a polypropylene resin molded article and a method for producing a polypropylene resin molded article which can be dyed with a dye.

Polypropylene (PP) is lightweight with a specific gravity of 0.91 as compared to other chemical fibers and natural fibers, and lightweight in water. For example, specific gravity of chemical fiber is 1.38 for polyester, 1.14 for nylon, 1.14 for acrylic, 1.30 for acetate, and 1.50 for rayon. The specific gravity of the natural fibers is 1.54 for the cotton, 1.32 for the wool, 1.40 for the silk, and 1.50 for the silk. In addition, polypropylene is highly hydrophilic and thus has high quick-dryness and warmth, and is also excellent in chemical resistance and strength.

Polypropylene is used for industrial applications such as blue sheets for curing and mesh sheets for building construction, so as to effectively utilize these characteristics. For example, there has been proposed a polymer alloy fiber having a sea-island structure formed by blending polypropylene and a cationic fluorine-containing polymer as a flame-resistant polypropylene fiber (Patent Document 1).

Further, as a modified polypropylene yarn which can be dyed by a water-salt bath (aqueous dyeing bath), a reaction product of a CR-polypropylene having a predetermined molecular weight containing a hydroxyl group and a bifunctional carboxylic acid or a corresponding carboxylic acid derivative (Patent Document 2).

Patent Document 1: JP-A-2015-148027 Patent Document 2: Japanese Patent No. 4188557

However, the polypropylene is not dyed sufficiently. For example, when a dye is treated with a disperse dye, the polypropylene is only dyed to such a degree that it is contaminated. For this reason, since medical products (clothing products) using polypropylene fibers are inferior in color development as compared with the medical treatment of other fibers, polypropylene is not currently circulated in general medical applications.

Therefore, for medical use, fibers other than polypropylene, such as polyester having good dyeability, are used. In this case, since the specific gravity of the fibers is large, the weight of the product becomes a problem.

Therefore, if polypropylene can be applied as a fiber for medical use, it can be lightweight because it has a smaller specific gravity than other materials such as polyester. Further, as compared with other fibers, since the apparent density becomes larger as the yarn is not made finer, it is possible to reduce the amount of dye used and to expect dye fastness to be satisfied.

In view of the above problems, it is an object of the present invention to provide a polypropylene resin composition, a polypropylene resin molded article and a method for producing a polypropylene resin molded article which can be dyed with a dye.

In order to solve the above problems, a polypropylene resin composition which is an embodiment of the present invention comprises a polypropylene which is unmodified and a maleic anhydride-modified polypropylene which is compatible with the polypropylene which is unmodified, and wherein the maleic anhydride- And the graft modification ratio of maleic anhydride is 1.50 to 2.50 mass%.

The mass ratio of the unmodified polypropylene and the maleic anhydride-modified polypropylene may be 50:50 to 97: 3.

The Z-average molecular weight of the maleic anhydride-modified polypropylene may be 50,000 to 100,000.

The Z-average molecular weight of the unmodified polypropylene may be 50,000 to 100,000.

The polypropylene resin composition may have a melt flow rate of 10 to 40 g / 10 min under conditions of a temperature of 230 캜 and a load of 2.16 kg.

The polypropylene resin molded article according to one embodiment of the present invention comprises a compatibilizing agent of polypropylene and maleic anhydride modified polypropylene which are unmodified and the graft modification ratio of maleic anhydride in the maleic anhydride modified polypropylene is 1.50 to 2.50 mass %.

The mass ratio of the unmodified polypropylene and the maleic anhydride-modified polypropylene may be 50:50 to 97: 3.

The Z-average molecular weight of the maleic anhydride-modified polypropylene may be 50,000 to 100,000.

The Z-average molecular weight of the unmodified polypropylene may be 50,000 to 100,000.

The compatibilizing agent may be a dyed product stained with a disperse dye.

The method for producing a polypropylene resin molded article according to one aspect of the present invention includes a step of producing a molten body of the polypropylene resin composition, a step of molding the molten body into a preform, a step of cooling the preform, And a cooling and solidifying step of obtaining a molded body by solidification.

The method for producing a polypropylene resin molded article may include a dyeing step of dying the molded article after the cooling and solidifying step with a disperse dye.

INDUSTRIAL APPLICABILITY As described above, according to the present invention, it is possible to provide a polypropylene resin composition, a polypropylene resin molded article, and a method for producing a polypropylene resin molded article which can be dyed with a dye.

1 is a side view schematically showing a multifilament manufacturing apparatus used for spinning.

Hereinafter, one form of the polypropylene resin composition, the polypropylene resin molded article and the method for producing the polypropylene resin molded article of the present invention will be described in detail.

[Polypropylene resin composition]

The polypropylene resin composition includes an unmodified polypropylene and a maleic anhydride-modified polypropylene which is compatible with the unmodified polypropylene. Unmodified polypropylene (hereinafter sometimes referred to as " unmodified PP ") is a thermoplastic resin obtained by polymerizing propylene, and is a polymer which has not been modified and which has not been modified at the time of condensation polymerization. When such unmodified PP is used, it is possible to provide a lightweight product which can reduce the amount of dye to be used even if the surface area of the fiber or yarn is increased, for example, and has high dye fastness. In addition, quick drying property, warmth property, chemical resistance and strength, which are characteristics of polypropylene, can be imparted to products such as fibers.

As the maleic anhydride-modified polypropylene (hereinafter sometimes referred to as " modified PP "), those compatible with the above-mentioned unmodified polypropylene are used. Modified polypropylene by modification with maleic anhydride has superior dyeability compared to unmodified PP. Particularly, the dyeability by the disperse dye is equivalent to that of a polyester which is generally used for medical use. When such modified PP is used in combination with unmodified PP, it can exhibit uniform dyeability while satisfying quick drying property, warming property, chemical resistance and strength while having high dye fastness and light weight.

For example, when a modified PP that is not compatible with unmodified PP is used, the distribution of unmodified PP and modified PP is not uniformized when the product is made of a yarn or a fiber, Sea islands) structure. In such a case, since the unmodified PP and the denatured PP have different dyeing properties, uniform dyeing properties of the entire product may not be satisfied.

In the maleic anhydride-modified polypropylene, the graft modification ratio of maleic anhydride is 1.50 to 2.50 mass%. The graft modification ratio of maleic anhydride is the content of maleic anhydride in the maleic anhydride-modified polypropylene. When the graft modifying ratio is within this range, excellent dyability can be exhibited while satisfying the properties as polypropylene. If the modification ratio of maleic anhydride is small, the dyeability may not be satisfied. In addition, when the modification ratio is large, there is a fear that it is not compatible with the unmodified PP. When the graft modification ratio is from 1.75 to 2.15 mass%, it can be stably and dyed even when a dye of various colors is used while satisfying compatibility with unmodified PP.

Specific examples of the polypropylene resin composition having the above characteristics include a mixture of a solid non-modified PP and a modified PP, such as powder, granule, pellet, and flake. In the case where any of the PPs is a pellet-like mixture, or when one of the PPs is flaky and the other PP is a pellet-like mixture, the other PP is in the form of powder and pellets and the other PP is in the form of flakes . The unmodified PP and the modified PP are melted and commercialized to be integrated into a solid such as a powder, a granule, a pellet or a flake, a non-modified PP and a modified PP made of a polymer alloy, It is also possible that the modified PP and the modified PP are dissolved in a solvent to form a liquid, which corresponds to the polypropylene resin composition. However, the polypropylene resin composition in the present invention is not limited to these.

The mass ratio of the unmodified polypropylene to the maleic anhydride-modified polypropylene is preferably 50:50 to 97: 3. When the mass ratio is within this range, excellent dyability can be exhibited while satisfying the characteristics as polypropylene. If the ratio of unmodified PP is large, the dyeability may not be satisfied. Further, even if the ratio of modified PP is increased, the dyeability is not improved. When the mass ratio is 70:30 to 95: 5, it is more preferable because it satisfies the characteristics as a polypropylene and the dyeability, and is excellent in workability in products such as yarns, fibers and films.

The maleic anhydride-modified polypropylene preferably has a Z average molecular weight (Mz) of 50,000 to 100,000. The molecular weight of the polymer influences the compatibility with other polymers and affects the workability because the melt viscosity and the like change. When the Z average molecular weight of the modified PP is within this range, compatibility with the unmodified PP and processability can be satisfied. If the Z average molecular weight of the modified PP is small, the influence of the maleic anhydride on the modification of the PP may be increased, and the dyeability may increase, but the compatibility with the unmodified PP may decrease. In addition, when the Z average molecular weight of the modified PP is large, the influence of the maleic anhydride on the modification of the PP may be small, and the dyeability may decrease. When the Z average molecular weight is in the range of from 70000 to 90000, it is more preferable to satisfy the compatibility with the unmodified PP and the processability, and to impart quick drying property, warmth property, chemical resistance and strength to the product.

The Z average molecular weight can be measured by, for example, GPC (gel permeation chromatography), and can be obtained by the following formula (1).

Z average molecular weight =? (Mi? Mi? Hi) /? (Mi? Hi)

Here, Mi is the molecular weight at the i-th point from the peak start point, and Hi is the peak height from the baseline at the i-th point from the peak start point.

The Z-average molecular weight of the unmodified polypropylene is preferably 50,000 to 100,000. When the Z average molecular weight of the unmodified PP is within this range, the compatibility with the modified PP and the processability can be satisfied. If the Z-average molecular weight of the unmodified PP is large, the melt viscosity may increase and the workability may decrease. If the Z-average molecular weight of the unmodified PP is small, there is a fear that the strength may be impaired when it is made into a product such as a thread or a fiber. In view of processability and product strength, it is more preferable that the Z average molecular weight is 85,000 to 95,000.

The melt flow rate (MFR) of the polypropylene resin composition is preferably 10 to 40 g / 10 min at a temperature of 230 캜 and a load of 2.16 kg. When the melt flow rate is within this range, the polypropylene resin composition can be satisfactorily processed when it is heated and melted and processed into a yarn or fiber. When the value of the melt flow rate is large or small, the workability may be deteriorated. Considering the applicability to various production apparatuses used for melt spinning, it is more preferable that the melt flow rate is 20 to 30 g / 10 min. The melt flow rate can be measured in accordance with, for example, JIS K 7210 (1999).

As the polypropylene resin composition, other components may be contained in addition to the unmodified polypropylene and maleic anhydride-modified polypropylene. For example, it may contain a polymer or additive which is compatible with the unmodified PP and the modified PP in accordance with the purpose of modification of the polypropylene and the like, and may also include a solvent or the like from the viewpoint of facilitating processing.

[Polypropylene resin molded article]

Next, the polypropylene resin molded article will be described. The polypropylene resin molded article includes a compatibilizing agent of polypropylene and maleic anhydride modified polypropylene which are unmodified. Unmodified PP is a thermoplastic resin obtained by polymerizing propylene and is a polymer which has not been modified and which has not been modified in condensation polymerization. Such a non-modified PP has a low specific gravity, so that it is possible to reduce the amount of dye used even if the surface area of the fiber or yarn is increased, for example, and to provide a lightweight polypropylene resin molded article having high dye fastness. Further, quick drying property, warming property, chemical resistance and strength which are characteristic of polypropylene can be imparted to the polypropylene resin molded article.

Modified PP is a modified polypropylene modified by modification with maleic anhydride, and is superior in dyeability to unmodified PP. Particularly, the dyeability by the disperse dye is equivalent to that of a polyester which is generally used for medical use. By including such a modified PP and an unmodified PP-compatible material, the polypropylene resin molded article has high dye fastness and light weight, and can exhibit uniform dyeability while satisfying quick drying property, thermal insulation property, chemical resistance and strength have. The compatibilizer is a solution or a mixture in which a plurality of substances are formed with affinity with each other. In the polypropylene resin molded article, the compatibilizing agent is a mixture of unmodified PP and denatured PP uniformly melted and mixed with each other without any uneven distribution of sea-island structure or the like.

In the maleic anhydride-modified polypropylene, the graft modification ratio of maleic anhydride is 1.50 to 2.50 mass%. The graft modification ratio of maleic anhydride is the content of maleic anhydride in the maleic anhydride-modified polypropylene. When the graft modifying ratio is within this range, excellent dyability can be exhibited while satisfying the properties as polypropylene. If the modification ratio of maleic anhydride is small, the dyeability may not be satisfied. In addition, when the modification ratio is large, there is a fear that it is not compatible with the unmodified PP. When the graft modification ratio is from 1.75 to 2.15 mass%, it can be stably stained and dyed even when a dye of various colors is used while satisfying compatibility with unmodified PP.

The polypropylene resin molded article having the above characteristics is obtained by processing a polypropylene resin composition and is used for a medical instrument such as a thread, a fiber, a fabric, a knitted fabric, a nonwoven fabric, a medical, a film, a sheet, a container, . However, the polypropylene resin molded article in the present invention is not limited to these.

The mass ratio of the unmodified polypropylene to the maleic anhydride-modified polypropylene is preferably 50:50 to 97: 3. When the mass ratio is within this range, excellent dyability can be exhibited while satisfying the characteristics as polypropylene. If the ratio of unmodified PP is large, the dyeability may not be satisfied. Further, even if the ratio of modified PP is increased, the dyeability is not improved. When the mass ratio is 70:30 to 95: 5, it is more preferable because it satisfies the characteristics as a polypropylene and the dyeability, and is excellent in workability in products such as yarns, fibers and films.

The maleic anhydride-modified polypropylene preferably has a Z average molecular weight of 50,000 to 100,000. The molecular weight of the polymer influences the compatibility with other polymers and affects the workability because the melt viscosity and the like change. When the Z average molecular weight of the modified PP is within this range, compatibility with the unmodified PP and processability can be satisfied. If the Z average molecular weight of the modified PP is small, the influence of modification with maleic anhydride may become large, and there is a possibility that compatibility with the unmodified PP and dyeability are lowered. Further, when the Z average molecular weight of the modified PP is large, the workability may be deteriorated due to the increase of the melt viscosity and the like. When the Z average molecular weight is in the range of from 70000 to 90000, it is more preferable to satisfy the compatibility with the unmodified PP and the processability, and to impart quick drying property, warmth property, chemical resistance and strength to the product.

The Z-average molecular weight of the unmodified polypropylene is preferably 50,000 to 100,000. When the Z average molecular weight of the unmodified PP is within this range, the compatibility with the modified PP and the processability can be satisfied. If the Z-average molecular weight of the unmodified PP is large, the melt viscosity may increase and the workability may decrease. If the Z-average molecular weight of the unmodified PP is small, there is a fear that the strength may be impaired when it is made into a product such as a thread or a fiber. In view of processability and product strength, it is more preferable that the Z average molecular weight is 85,000 to 95,000.

The compatibilizing agent may be a dyed product stained with a disperse dye. Examples of the dyes include disperse dyes, cation dyes, acid dyes and water-soluble dyes. Depending on the purpose, various dyes can be dyed singly or in combination. By using a disperse dye in particular, it is possible to achieve uniformity in dyeability without any unevenness. The dyeing can be carried out by using a conventional dyeing method such as immersing an aqueous solution in a dye.

As the polypropylene resin molded article, other components may be contained in addition to the unmodified polypropylene and maleic anhydride-modified polypropylene. For example, it may contain polymers, additives, plasticizers and the like which are compatible with unmodified PP and modified PP in accordance with the purpose of modification of polypropylene and the like, and may include the above-mentioned dyes and the like.

[Production method of polypropylene resin molded article]

Next, the production method of the above-mentioned polypropylene resin molded article will be described. The production method includes a melt production step, a molding step, and a cooling solidification step shown below.

(Melt production process)

Is a step of obtaining a melt of the polypropylene resin composition of the present invention. For example, the polypropylene resin composition can be melted by heating, decompression, or the like. The molten material is a liquid mixture having non-modified PP and modified PP which are mixed and mixed homogeneously and mixed with each other and have fluidity. As a method of heating or decompressing the polypropylene resin composition, a usual method can be employed. For example, the pellets of the polypropylene resin composition are put into a tank provided with a heating means, and the pellets are heated and kneaded with a stirring blade or the like to obtain a melt.

(Molding step)

And molding the molten material to obtain a preform. For example, in the case of producing a yarn as a polypropylene resin composition, an extruding port capable of extruding a molten material such as a spinneret from a tank is provided in the tank, and the molten material is extruded from the extruding port , A preform as a fluid of yarn can be obtained.

Further, in the case of producing a film, for example, the molten material in the tank is sent to a T-die having a manifold, a lip, etc., and the molten material is spread in the width direction in the manifold, The thickness of the preform is adjusted so that a preform as a film-like fluid can be obtained.

(Cooling and solidifying step)

And cooling and solidifying the preform to obtain a molded article. The preform is a molten fluid and can be solidified by cooling it. For example, when a yarn is produced as a polypropylene resin composition, the fluid of the yarn may be solidified by leaving it at room temperature.

Further, in the case of producing a film, the film-like fluid is sent to a casting apparatus, for example, and brought into contact with a cooling roll of the casting apparatus, whereby the film can be cooled and solidified to be a film.

[Dyeing Process]

The production method of the polypropylene resin molded article may further include a dyeing step. Examples of the dyes used in the dyeing process include disperse dyes, cation dyes, acid dyes and water-soluble dyes. Depending on the purpose, various dyes can be dyed singly or in combination. By using a disperse dye in particular, it is possible to achieve uniformity in dyeability without any unevenness. Although the dyeing step is not particularly limited, for example, an ordinary dye is dipped in a dispersion in which a dispersion dye is dissolved, and the dye is heated to 130 DEG C for about 30 minutes. After that, a soaping agent is added to the dye Washing, dewatering, drying, and the like. The dyeing step can be carried out after the cooling and solidifying step, and the dyeing step can be carried out during each of the above steps, or can be performed together with the above steps. For example, after a molten body of the polypropylene resin composition is obtained, a dye may be added to the molten material, and the molten material may be molded after dyeing.

As the production method of the polypropylene resin molded article, other steps besides the aforementioned melt production step, molding step, cooling solidification step and dyeing step may be further included. For example, it may include a processing step of processing the formed body into a predetermined shape after the cooling and hardening step.

Specifically, in the case of producing a yarn as the polypropylene resin composition, it is preferable that the yarn after the cooling and solidifying step is subjected to a stretching step of heating and pulling the yarn again, a heat treatment step of deforming the yarn by heat treatment, And a winding step of winding the yarn with a bobbin or the like.

Further, in the case of producing a film, it is possible to use a stretching process for longitudinally or transversely stretching the film after the cooling and solidifying process, a corona treatment process for improving adhesion of ink or adhesive, a flame treatment process, a chemical treatment process, , And the like.

INDUSTRIAL APPLICABILITY As described above, according to the present invention, a polypropylene resin composition, a polypropylene resin molded article and a method for producing a polypropylene resin molded article, which are particularly suitable for general medical applications, can be provided by being dyed with a dye.

Example

Hereinafter, the present invention will be described more specifically based on examples and comparative examples. However, the present invention is not limited to the following examples.

[Selection of dye as medical grade]

The black dye shown in Table 1 was used to evaluate the dyability of the unmodified polypropylene, maleic anhydride modified polypropylene and polyester. Table 2 shows the physical properties of the polypropylene without modification and the maleic anhydride-modified polypropylene. Polyester terephthalate (MFR (280 占 폚, 2.16 kg): 30 g / 10 min, melting point: 250 占 폚, specific gravity: 1.38, Z average molecular weight: 160,000) Used.

(Dyeing method)

As each polymer, a pellet-shaped master batch was used and the respective pellet-like polymers were dyed under the following conditions.

Disperse dye: The polymer is immersed in the disperse dye heated at 130 ° C for 30 minutes.

Cationic dye: The polymer is immersed in a cationic dye heated to 120 ° C for 30 minutes.

· Acid dye: Immerse the polymer in the acid dye heated to 100 ° C for 30 minutes.

· Direct dye: Immerse the polymer in a direct dye heated to 90 ° C for 30 minutes.

After the above dyeing, each pellet-like polymer was naturally dried at room temperature to evaluate the dyeability. The results are shown in Table 3. In Table 3, when the lightness (L *) using a spectrophotometer was less than 20, the lightness was 0, the lightness was 20 to 60 and the lightness was greater than 60, and the dyeing was insufficient It was evaluated as Х,.

When the modified PP was stained with a disperse dye, it exhibited dyeability similar to that of a polyester used in a medical product. Also, the modified PP can be dyed by cationic dyes but not by acidic dyes or direct dyes.

The unmodified PP can be dyed with a disperse dye, but does not satisfy dyeability as a medical grade.

From the above results, it was found that the modified PP was excellent in dyeability by the disperse dye. However, since the MFR value is high, it is difficult to process it with yarn or fiber. On the other hand, the unmodified PP has a low MFR value and is easy to be processed into a yarn or fiber although the modified PP is poor in dyeability. Thus, as shown below, a compatibilizing agent of unmodified PP and modified PP was prepared so as to find a polypropylene capable of satisfying dyeability and workability, and dyeability and processability were evaluated.

[Evaluation of dyeability of polypropylene resin composition]

An admixture in which the unmodified PP and the denatured PP were mixed at a predetermined ratio was prepared and the MFR of the compatibilizing agent and the dyeability using the disperse dye were evaluated. The results are shown in Table 4. In Table 4, the evaluation method of dyeability is the same as in Table 3.

For processing into fibers or fibers, the MFR of the polymer is preferably 10 to 40 g / 10 min. From the results in Table 4, it was found that when the mass ratio of the unmodified PP to the denatured PP was 95: 5 to 67: 33, the workability and dyeability were satisfied.

In the above, the processability of assuming a yarn or a fiber was evaluated. In the case of producing a sheet or a film, however, regardless of the result of Table 4, the MFR can be adjusted to an appropriate MFR for a production apparatus.

[Evaluation of radioactivity and radiation]

Next, Examples 1 to 4 and Comparative Example 1 shown below were carried out on the basis of the evaluation results of [selection of dyestuff as a medical chart] described above, and a polypropylene resin composition was prepared by spinning Thereafter, evaluation was made on the spinnability, spinnability, and fastness to dyeing.

<radiation>

A multifilament manufacturing apparatus (manufactured by Musashino Kikai Co., Ltd.) was used as the radiator. 1 is a side view schematically showing a multifilament manufacturing apparatus 100 used for spinning.

 (Multifilament manufacturing apparatus)

The multifilament manufacturing apparatus 100 includes a hopper 10 into which a raw material is charged, a cylinder 20 which heats and melts the raw material sent by the hopper 10, a melted A heating cylinder 40 for heating the yarn Y extruded from the nozzles from the periphery, a heating cylinder 40, and a heating cylinder 40. The nozzle 30 is formed by extruding a raw material from a circular hole at a pressure P indicated by an arrow, A cooling cylinder 50 for cooling the yarn from the periphery thereof, an oiling roll 60 for performing an oiling treatment on the yarn sent from the cooling cylinder 50, A stretching roll 80 for stretching the yarn, and a bobbin 90 for winding the yarn after stretching.

(Radiation treatment)

The polypropylene resin composition is used as a raw material and the raw material is fed into the multifilament manufacturing apparatus 100 by the opening 11 of the hopper 10 and melted by the cylinder 20 and sent to the nozzle 30, The raw material was extruded from the round hole by a pressure applied to the head 31 from a gear pump of a city not shown, and was made into a plurality of yarns. The yarn Y is solidified through the heating cylinder 40 and the cooling cylinder 50 while bundling the plurality of yarns into a single yarn Y. [ In the cooling cylinder 50, an air A indicated by an arrow was sent to cool the yarn Y. Thereafter, an oiling treatment and a stretching treatment were carried out, and the yarn was wound around the bobbin 90 to complete the spinning treatment.

The spinning conditions were as follows: temperatures of 180 ° C, 190 ° C, 200 ° C, and 200 ° C at the portions indicated by reference numerals 21 to 24 in the cylinder 20, and a 24-filament nozzle was used for rounding the nozzle. The resin temperature in the nozzle 30 was 220 占 폚, and the amount of extrusion from the vortex was 7.5 g / min. The stretching conditions were as follows: the peripheral speed of the oil ring roll was 150 m / min, the peripheral speed of the pretension roll 70 was 200 m / min, the peripheral speed of the stretching roll 81 was 210 m / min, ) At a rate of 250 m / min (stretching magnification 1.2 times), a temperature of 40 占 폚, a peripheral speed of a stretching roll 83 of 240 m / min, and a temperature of 40 占 폚. It was rated as good radioactive when stable for more than 1 hour and capable of radiation.

<Translation>

The test was carried out using a testing machine (manufactured by koikemachine) so that the above-prepared spinning was communicated in a tubular form.

<Refinement>

In order to refine the dirt and oil adhering to the obtained trays, a tube was added to a washing solution to which a surfactant (Score roll E13 made by HOKKO CHEMICALS Co., Ltd.) was added at a ratio of 1 g / L, Minute. Thereafter, it was washed with water, and the dirt, oil and surfactant were removed from the tube.

<dyeing>

With respect to the post-refinement operation, the disperse dye shown in Table 1 was used to dyes a common piece in a disperse dye heated at 130 캜 for 30 minutes in the same manner as a general polyester dyeing method. After dyeing, the trays were naturally dried at room temperature, and the lightness and dye fastness were evaluated.

<Measurement of brightness>

(L *) was measured for three portions of the barrel with a spectrophotometer to determine that the barrel after dyeing was uniformly dyed, and that the average value was less than 20, And judged it as good. In addition, when the average value was 20 or more, it was evaluated that dyeing to black was insufficient and was defective.

<Dye fastness>

(Friction fastness)

The friction fastness was evaluated using a friction tester in accordance with JIS L0849. It was evaluated that the friction coefficient of the friction coefficient was 3 to 4 or more and the wet friction coefficient of the friction coefficient was 3 to 4 or more.

(Washing fastness)

The washing fastness was measured in accordance with JIS L0844 (method A-2). As the attached fabric, cotton and nylon were used, and it was evaluated that the fastness to washing was good when the fabric having a high degree of contamination had a grade of 3-4 or higher.

[Example 1]

The pellets of unmodified PP (NOVATEC SA3A made by Japan Polypropylene Corporation) shown in Table 2 and pellets of modified PP (KAYABRID 006 P manufactured by Kayaku Akzo Corporation) were mixed at 240 占 폚 in a mass ratio of 90:10, 230 占 폚, 2.16 kg) and an average molecular weight (Mz) of 90000 were obtained. This pellet was spun to obtain polymer fibers of 300 decitex 24 filaments. No yarn breakage occurred for more than one hour from the start of radiation, and the radioactivity was good.

The obtained polymer fibers were allowed to pass thoroughly and the dispersion dye was dyed under the conditions of 4% o.w.f. (using 4 g of dye per 100 g of polymer fiber). The lightness was good at 18.17, and the fastness to rubbing was good to 3-4 grade of dry friction and 3-4 grade of wet friction. Also, the washing fastness was good in the 3-4 grade.

[Example 2]

The pellets of unmodified PP (NOVATEC SA3A, manufactured by Japan Polypropylene Corporation) and denatured PP (Kayabu Akzo Corporation KAYABRID 006 P) shown in Table 2 were mixed at a mass ratio of 85:15 at 240 占 폚 and MFR 22.0 (230 占 폚, 2.16 kg) and an average molecular weight (Mz) of 89000 were obtained. This pellet was spun to obtain polymer fibers of 300 decitex 24 filaments. No yarn breakage occurred for more than one hour from the start of radiation, and the radioactivity was good.

The obtained polymer fibers were allowed to pass thoroughly, and the dispersion dyes were dyed under the condition of 4% o.w.f. after refining. The lightness was good at 16.87, and the fastness to rubbing was good to 3-4 grade of dry friction and 3-4 grade of wet friction. Also, the washing fastness was good in the 3-4 grade.

[Example 3]

The pellets of the unmodified PP (NOVATEC SA3A, manufactured by Japan Polypropylene Corporation) and the modified PP (Kayabu Akzo Corporation KAYABRID 006 P) shown in Table 2 were mixed at a mass ratio of 80:20 at 240 占 폚 and MFR 24.5 (230 占 폚, 2.16 kg) and an average molecular weight (Mz) of 89000 were obtained. This pellet was spun to obtain polymer fibers of 300 decitex 24 filaments. No yarn breakage occurred for more than one hour from the start of radiation, and the radioactivity was good.

The obtained polymer fibers were allowed to pass thoroughly, and the dispersion dyes were dyed under the condition of 4% o.w.f. after refining. The lightness was good at 15.76, and the fastness to rubbing was good with 3-4 grade of dry friction and 3-4 grade of wet friction. Also, the washing fastness was good in the 3-4 grade.

[Example 4]

The pellets of the unmodified PP (NOVATEC SA3A, manufactured by Japan Polypropylene Corporation) and the modified PP (KAYABRID 006 P made by Kayaku Akzo Corporation) shown in Table 2 were mixed at a mass ratio of 75:25 at 240 캜 to give a MFR of 27.3 , 2.16 kg) and an average molecular weight (Mz) of 89000 were obtained. This pellet was spun to obtain polymer fibers of 300 decitex 24 filaments. No yarn breakage occurred for more than one hour from the start of radiation, and the radioactivity was good.

The obtained polymer fibers were allowed to pass thoroughly, and the dispersion dyes were dyed under the condition of 4% o.w.f. after refining. The lightness was good at 15.68 and the fastness to rubbing was good as 3-4 grade of dry friction and 3-4 grade of wet friction. Also, the washing fastness was good in the 3-4 grade.

[Comparative Example 1]

Without using modified PP, pellets of unmodified PP (NOVATEC SA3A made by Japan Polypropylene Corporation) shown in Table 2 were spun to obtain polymer fibers of 300 decitex 24 filaments. No yarn breakage occurred for more than one hour from the start of radiation, and the radioactivity was good.

The obtained polymer fibers were allowed to pass thoroughly, and the dispersion dyes were dyed under the condition of 4% o.w.f. after refining. The lightness was 25.07, and the dyeing to black was insufficient. In addition, the fastness to rubbing was good as 3-4 grade of dry friction and 3-4 grade of wet friction. Also, the washing fastness was good in the 3-4 grade.

Table 5 shows the evaluation results of mixing ratio, MFR, average molecular weight, brightness and dyeability of the unmodified PP and denatured PP of the pellets in Examples 1 to 4 and Comparative Example 1.

In order to emit radiation, the MFR of the polymer is preferably 10 to 40 g / 10 min. According to Table 4, if the mass ratio of the unmodified PP to the modified PP is 95: 5 to 67: 33, Is obtained. Table 5 shows the results of actually radiating and evaluating radioactivity, dyeability, and the like, and this result was able to support Table 4.

[theorem]

As is apparent from the examples, the polypropylene resin composition of the present invention can provide and provide a polypropylene resin composition excellent in workability and durable with a disperse dye or the like. Therefore, it is a well-known yarn or fiber for medical products, and can also be applied to a sheet or a film.

Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to these examples. It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the scope of the invention as defined in the appended claims. And the scope of the present invention is to be understood as falling within the technical scope of the present invention.

10: Hopper
11: opening
20: Cylinder
21, 22, 23, 24: part in the cylinder 20
30: Nozzle
31: Head
40: heating tube
50: cooling cylinder
60: Oil ring roll
70: Pretensioning roll
80, 81, 82, 83 stretching rolls
90: Bobbin
100: Multifilament manufacturing apparatus
A: air
P: Pressure
Y: Thread

Claims (12)

Unmodified polypropylene, and
Maleic anhydride modified polypropylene which is compatible with said unmodified polypropylene,
Wherein the graft modification ratio of maleic anhydride in the maleic anhydride-modified polypropylene is 1.50 to 2.50 mass%. The method according to claim 1,
Wherein the mass ratio of the unmodified polypropylene to the maleic anhydride-modified polypropylene is 50:50 to 97: 3. 3. The method according to claim 1 or 2,
Wherein the maleic anhydride-modified polypropylene has a Z average molecular weight of 50,000 to 100,000. 4. The method according to any one of claims 1 to 3,
And the Z-average molecular weight of said unmodified polypropylene is 50,000 to 100,000. 5. The method according to any one of claims 1 to 4,
Wherein the melt flow rate is 10 to 40 g / 10 min under conditions of a temperature of 230 캜 and a load of 2.16 kg. Modified polypropylene and a maleic anhydride-modified polypropylene,
Wherein the graft modification ratio of maleic anhydride in the maleic anhydride-modified polypropylene is 1.50 to 2.50 mass%. The method according to claim 6,
Wherein the mass ratio of the unmodified polypropylene to the maleic anhydride-modified polypropylene is 50:50 to 97: 3. 8. The method according to claim 6 or 7,
Wherein the maleic anhydride-modified polypropylene has a Z average molecular weight of 50,000 to 100,000. 9. The method according to any one of claims 6 to 8,
And the Z-average molecular weight of said unmodified polypropylene is 50,000 to 100,000. 10. The method according to any one of claims 6 to 9,
Characterized in that said compatibilizer is a dyed product stained with a disperse dye. A process for producing a melt of a polypropylene resin composition according to any one of claims 1 to 5,
A molding step of molding the molten material into a preform, and
A cooling and solidifying step of cooling and solidifying the preform to obtain a molded article,
Wherein the polypropylene resin molded article is a polypropylene resin molded article. 12. The method of claim 11,
And a dyeing step of dyeing the molded body after the cooling and solidifying step with a disperse dye.

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