KR101886417B1 - Eco-friendly PVC film manufacturing method - Google Patents

Abstract

The present invention relates to a process for producing an environmentally friendly PVC (polyvinyl chloride) film, and more particularly, to a process for producing an environmentally friendly PVC decolor film (including transparent, translucent and colored) as well as a PVC soft film used for stationery such as a pencil case, The present invention relates to a method of manufacturing an environmentally friendly PVC film, which can solve problems such as pinholes, streaks, wrinkles, and the like caused when a PVC film is manufactured through a calendering process.

Description

[0001] The present invention relates to an Eco-friendly PVC film manufacturing method,

The present invention relates to a process for producing an environmentally friendly PVC (polyvinyl chloride) film, and more particularly, to a process for producing an environmentally friendly PVC decolor film (including transparent, translucent and colored) as well as a PVC soft film used for stationery such as a pencil case, The present invention relates to a method of manufacturing an environmentally friendly PVC film, which can solve problems such as pinholes, streaks, wrinkles, and the like caused when a PVC film is manufactured through a calendering process.

As is well known, polyvinyl chloride (PVC) is widely used in various fields because it has various features such as low price, excellent flexibility, processability, transparency, durability, chemical resistance and postprocessability.

Typical applications of such PVC include, but are not limited to, medical fields, stationery and toys, tents and mats, commercial color sheets, substrate cushions for electronic circuits, electrical insulating tapes, decorative sheets, interior films, bags, Can be cited as examples. In addition, it is widely used so that it can not be counted.

Among them, soft PVC films or decorative PVC films used in stationery such as pencil cases should not be harmful to human beings because they are used by growing children.

Nevertheless, in the case of the conventional PVC film, the harmful component of human body has been detected, and improvement thereof is required.

In addition, a small hole (including air bubbles) on the surface of the film due to various causes such as uneven kneading of raw materials, poor particle size, poor pigment dispersion, poor adhesion, dust incorporation, poor cooling, There is a drawback in that the quality of the product is deteriorated due to the occurrence of pinhole phenomenon, wrinkle defect in which wrinkles are formed, defective banding in which stripes are formed, etc. In addition, there are many difficulties in manufacturing thin PVC film used for stationary have.

Korean Patent Registration No. 10-0282167 (Nov. 25, 2000), 'Method for producing polyvinyl chloride film' Korean Patent Registration No. 10-1792231 (Oct. 25, 2017), 'PVC Film Manufacturing System'

DISCLOSURE Technical Problem The present invention has been made in view of the above-described problems in the prior art, and it is an object of the present invention to provide a PVC film which is produced not only in a PVC soft film but also in a PVC film, The present invention provides a method of manufacturing an eco-friendly PVC film that can solve the problems of pinholes, streaks, wrinkles and the like and improve the quality thereof.

In order to accomplish the above object, the present invention provides a method for mixing a raw material with a super mixer, A mixed raw material extruding step of extruding the mixed and dispersed raw materials through a raw material mixing step while discharging the mixed and dispersed raw materials through a hopper which is a reservoir of the intermediate mixture while discharging the mixed raw materials into a liquid phase so as to filter out entangled matters and segregation; An extruded raw material mixing step of kneading the extruded raw material again through three mixing stages through two mixing mills maintained at 100-110 占 폚 so as to prevent fine dispersion and heterogeneous dispersion from occurring; A calendering step of transferring molten raw materials melted through a mixing mill to a conveyor and molding the melted raw materials into a film form through four rolling rolls rotating in opposite directions while being maintained at 140-160 占 폚; An embossing and embossing step of removing the molten film from the last roll of the calendar and giving the film surface gloss or texture; And cooling and winding the film surface by cooling and solidifying the surface of the film, measuring the thickness of the cooled film, trimming the width of the film, and wrapping the film in the form of a roll for packaging in the form of a semi-finished product or an end product. ;
In the raw material mixing step, the raw materials to be fed into the super mixer were 2.5 wt% of hydrocolloid, 4.5 wt% of water-soluble SiO ₃ , 3.5 wt% of oregano oil, 2.5 wt% of uronic acid, 6.5 wt% of perfluoropolyether 1.5% by weight of heelite, 5.5% by weight of epoxidized oil (ESBO), 3.5% by weight of polycarboxylic acid sodium salt, 0.5% by weight of pigment and the balance PVC;
4.5 wt% of TXIB, 4.5 wt% of PEEK, 1.5 wt% of trimethylbenzylammonium bromide, and 2.5 wt% of a mixture of azelic acid and pyrometric acid in a weight ratio of 1: 1 were added to the surface of the rolling roll used in the calendering step % Of isobutanol, 1.5 wt.% Of ethylenebisstamide, 4.0 wt.% Of abietic acid, 3.5 wt.% Of dimethylpolysiloxane, 2.5 wt.% Of benzyldimethyldodecylammonium chloride, 2.5 wt.% Of isodecylisononanoate and 0.1 wt. 3.5 wt% of a zirconium oxide powder having a particle size of less than 1 mu m, 2.5 wt% of zinc phosphate, and a coating material composed of the remaining polycarbonate resin is coated.

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According to the present invention, it is possible to solve the problems of pinholes, stripes, wrinkles, and the like, which are generated when a PVC film is produced through a calendering process, An improved effect can be obtained.

Hereinafter, preferred embodiments according to the present invention will be described in detail.

Before describing the present invention, the following specific structural or functional descriptions are merely illustrative for the purpose of describing an embodiment according to the concept of the present invention, and embodiments according to the concept of the present invention may be embodied in various forms, And should not be construed as limited to the embodiments described herein.

In addition, it should be understood that the embodiments according to the concept of the present invention include various modifications, equivalents, and alternatives included in the spirit and technical scope of the present invention, .

The process for producing an eco-friendly PVC film according to the present invention comprises a raw material mixing step, a mixed raw material extruding step, an extrusion raw material mixing step, a calendering step, a drawing and an embossing step, a cooling and winding step.

Here, the raw material mixing step is a step of uniformly dispersing and mixing raw materials into a super mixer.

At this time, the weighing of the raw material is performed using a meter, and this is a kind of primary kneading step. In the present invention, the phthalate plasticizer is not used to further enhance the environmental friendliness.

The raw material was prepared by mixing 2.5 wt% of hydrocolloid, 4.5 wt% of water-soluble SiO ₃ , 3.5 wt% of oregano oil, 2.5 wt% of uronic acid, 6.5 wt% of perfluoropolyether, 1.5 wt% 5.5% by weight of epoxidized oil (ESBO), 3.5% by weight of polycarboxylic acid sodium salt, 0.5% by weight of pigment and the balance PVC.

Here, the hydrocolloid is added in order to fix the adhesive property for a long period of time by forming a gel and maintaining the wet state. The hydrocolloid is not only flexible but also has a waterproof function, thereby blocking the penetration of bacteria from the outside .

The water-soluble SiO ₃ is added to eliminate human toxicity and is added to remove human toxicity by adsorbing and removing the six harmful substances, which are inevitably contained in the water.

In addition, the oregano oil not only performs antimicrobial functions for sterilizing norovirus or rotavirus, which is a frequently contaminated contaminating microorganism that elutes and contributes to keeping it from sticking to the surface of calendaceous rolls Lt; / RTI >

In addition, the above-mentioned uricolic acid is added in order to enhance the viscosity and flexibility of the film to improve bufferability, bending property, durability and crack resistance.

The perfluoropolyether is added to prevent pinholes, streaks and wrinkles while preventing slippage on the roll surface by decreasing the calendering frictional resistance by increasing slipperiness.

The heelite is a super fine particle of 400 mesh or more and is a pure mineral which is not influenced by pH and is a complex of amorphous aluminum silicate and a low crystalline laminar clay mineral. These heights are known to have far infrared emissivity (5-20 ㎛) of 0.93 and radiant energy (w / ㎡, ㎛, 40 ℃) of 3.74 Ũ 10 ², enhancing human benefit.

In addition, the above-mentioned epoxidized oil (ESBO) contributes to the plasticizing, i.e., emulsifying action of PVC as a plasticizer, and is an environmentally friendly plasticizer which does not use a phthalate-based plasticizer.

Particularly, the polycarboxylic acid sodium salt is a liquid high-performance dispersant having excellent coloring property and viscosity stability. In the present invention, the polycarboxylic acid sodium salt inhibits pinhole formation, wrinkle formation and stripe formation due to non-uniform dispersion of calendering, do.

In addition, the pigment may be an oxide powder having a particle size of 0.1 mu m, preferably one of a red-based, a blue-based, and a yellow-based, in order to maintain environmental friendliness and non-toxicity.

In this case, red oxide powders of the oxide powders were prepared by mixing 2 to 4% by weight of sodium bicarbonate and 1.5 to 1.5% by weight of boron oxide (Fe ₂ O ₃ ) and chromium oxide (Cr ₂ O ₃ ) -2.5% by weight, and calcining the calcined product with a crusher to have a particle size of 1 μm or less. The calcined product is dried at 100 ° C. for 10 hours, ≪ / RTI > The blue oxide powder differs only from cobalt aluminate (CoAl ₂ O ₄ ) instead of hematite; The oxide powder of the yellow series is different only from zinc iron oxide (ZnFe ₂ O ₄ ).

Of course, it is natural that various inorganic pigments can be used in addition to these oxide powders.

Meanwhile, the mixing raw material extruding step is a step of extruding the mixed and dispersed raw materials through a raw material mixing step while discharging the mixture from a hopper which is a reservoir of the intermediate mixture, using a screw extruder.

Here, the reason for extruding using a screw extruder is to suppress the occurrence of poor granularity, micro-dispersion or bubble generation described later by preventing entanglement and foreign matter present in the raw material from being segregated in the case of inorganic substances .

Particularly, all of the powdery materials used in the present invention should have a particle size of 0.1 mu m so as to maintain particle size uniformity.

In addition, extrusion in the mixed raw material extrusion step is extruded so as to be discharged in a liquid phase, unlike extrusion for the production of generally known pellets and the like.

In this case, a foam inhibitor may be further added during extrusion. Boric acid is preferably used as the bubbler inhibitor, and it is preferable to add boric acid at a rate of 0.01 g per minute to the extrusion rate.

The extruded raw material mixing step is a step of kneading the extruded discharged material, that is, the extruded raw material, again through a mixing mill, which is a two rolling roll, through a third stage, And the third continuous kneading step.

By such a mixing step, a perfectly homogeneous dispersion of raw material is achieved, so that there is no problem caused by the subsequent dispersion of calendering or non-uniform dispersion.

The calendering step is a step of transferring the molten raw material to the conveyor through a mixing mill and shaping it into a film form through four rolling rolls maintained at 140-160 ° C.

Usually, calendering refers to a molding method in which a film is continuously produced by rolling a raw material between two or more rolls rotating in mutually opposite directions.

At this time, the stickiness of the raw material may be caused by the temperature difference between the surface of the rolling roll for producing a film at a high temperature and the raw material. Of course, in order to minimize such phenomenon in the above-mentioned raw material composition, the rollers for film production include the specific components, but in order to prevent the sticky property more easily, the surface of the rolled roll for film production is required to have heat resistance, slip property for securing sticking property, It can be coated with a coating material.

This special coating material was prepared by mixing 4.5 wt% of TXIB, 4.5 wt% of PEEK, 1.5 wt% of trimethylbenzylammonium bromide, 2.5 wt% of a mixture of azelic acid and pyrometric acid in a weight ratio of 1: 1, 1.5% by weight of amide, 4.0% by weight of abietic acid, 3.5% by weight of dimethylpolysiloxane, 2.5% by weight of benzyldimethyldodecylammonium chloride, 2.5% by weight of isodecylisononanoate, 3.5% by weight of zirconium oxide powder, 2.5% by weight of zinc phosphate and the remaining polycarbonate resin.

Here, TXIB (2,2,4-trimethyl-1,3-pentanediol diisobutyrate) is added to perform a non-toxic resin softening function and enhances coating stability by increasing the adhesion of the coating film to the coating.

The above-mentioned PEEK (Polyetheretherketone) is a thermoplastic high-performance plastic resin, which is added to maintain it because it is excellent in chemical resistance, water resistance and high-temperature stability, and is further added to improve sticking resistance.

In addition, the above-mentioned trimethylbenzylammonium bromide is added in order to promote curing stability by promoting the reaction and to maintain a strong bonding property of the coating film.

In addition, the mixture of azelaic acid and pyrometric acid in a weight ratio of 1: 1 is added to suppress heat shrinkage and to enhance slipperiness, thereby suppressing deformation of the coating layer as well as maintaining stickiness.

Also, the ethylene bis stearamide is added to prevent blocking and scratch by increasing surface smoothness while suppressing yellowing.

In addition, the abietic acid reacts with water to induce insoluble calcium saponification, thereby forming a strong film, thereby enhancing watertightness and enhancing stickiness.

Further, the dimethylpolysiloxane is composed of a siloxane bond (Si-O-Si) strongly resistant to heat and an organic methyl group, and is added to increase foaming resistance, heat resistance, thermal oxidation stability, and chemical resistance.

In addition, the benzyldimethyldodecylammonium chloride is added in order to induce surface homogenization and improve the slip property.

In addition, the isodecyl isononanoate is added to increase the flexibility and increase the degree of molding freedom and to increase the elongation.

The zirconium oxide powder is an amorphous white powder which is added as a kind of ceramics having a melting point of 2.677 캜, a density of 5.6 g / cm ³ and a Mohs hardness of 7 to increase the hardness and enhance the wear resistance.

The zinc phosphate is added to strengthen the stickiness by forming a film on the surface of the roll and immobilizing it to block the contact of erosion-inducing substances such as air, water and carbon dioxide, and to improve the slip property.

In addition, the polycarbonate resin is added to increase the hardness, strength and surface smoothness of the polycarbonate resin to suppress molding defects, and to enhance durability due to improved crack resistance and erosion resistance.

On the other hand, the take-up and embossing step is a step of peeling off the molten film from the last roll of the calendar and giving a luster or a pattern to the film surface.

Of course, if gloss or pattern is not required, only the drawing process is performed, and the embossing step can be omitted.

In addition, the cooling and winding step is a step of cooling the film surface to solidify the film surface, measuring the thickness of the cooled film, trimming the width of the film, and then winding the film in a roll form for packaging in a semi-finished or finished product state.

Through such a step, it is possible to produce an environmentally friendly and harmless PVC film.

In order to confirm whether the film produced through the above-described manufacturing method is harmful to human body, it was examined whether 6 heavy metals (Pbdes, hexavalent chromium, mercury, lead, arsenic, cadmium, etc.) (DBP, BBP, DEHP, DNOP, DINP, DIDP, etc.) were detected according to US EPA 8061A (GC / MS) regulations. In addition, 7 small volatile organic compounds Benzene, formaldehyde, toluene, xylene, ethylene, styrene, acetaldehyde, etc.) were detected.

As a result, it was found that most of these heavy metals, phthalates and volatile organic compounds were not detected. In the case of volatile organic compounds, trace amounts of two substances such as ethylene and acetaldehyde were detected, but they were extremely harmless to the human body .

As a result, it has been confirmed that it is environmentally friendly.

Further, when the coating layer was further formed on the four rolling rolls used in the calendar, the surface state of the formed film and the stickiness caused on the surface of the rolling roll were confirmed.

As a result, no defects such as pinholes, wrinkles and streaks were found on the surface of the molded PVC film, and a high-quality PVC film having a high level of smoothness was obtained.

In addition, the surface of the rolled roll was confirmed after rolling for 120 hours, but stickiness was not observed at all, and cracks, scratches, yellowing, erosion or the like of the coating layer were not found at all.

Claims (3)

A raw material mixing step of uniformly dispersing and mixing raw materials into a super mixer; A mixed raw material extruding step of extruding the mixed and dispersed raw materials through a raw material mixing step while discharging the mixed and dispersed raw materials through a hopper which is a reservoir of the intermediate mixture while discharging the mixed raw materials into a liquid phase so as to filter out entangled matters and segregation; An extruded raw material mixing step of kneading the extruded raw material again through three mixing stages through two mixing mills maintained at 100-110 占 폚 so as to prevent fine dispersion and heterogeneous dispersion from occurring; A calendering step of transferring molten raw materials melted through a mixing mill to a conveyor and molding the melted raw materials into a film form through four rolling rolls rotating in opposite directions while being maintained at 140-160 占 폚; An embossing and embossing step of removing the molten film from the last roll of the calendar and giving the film surface gloss or texture; And cooling and winding the film surface by cooling and solidifying the surface of the film, measuring the thickness of the cooled film, trimming the width of the film, and wrapping the film in the form of a roll for packaging in the form of a semi-finished product or an end product. ;
In the raw material mixing step, the raw materials to be fed into the super mixer were 2.5 wt% of hydrocolloid, 4.5 wt% of water-soluble SiO ₃ , 3.5 wt% of oregano oil, 2.5 wt% of uronic acid, 6.5 wt% of perfluoropolyether 1.5% by weight of heelite, 5.5% by weight of epoxidized oil (ESBO), 3.5% by weight of polycarboxylic acid sodium salt, 0.5% by weight of pigment and the balance PVC;
4.5% by weight of TXIB (2,2,4-trimethyl-1,3-pentanediol diisobutylate), 4.5% by weight of PEEK (polyetheretherketone), 0.1% by weight of trimethyl 2.5% by weight of a mixture of 1.5% by weight of benzylammonium bromide and a mixture of azelic acid and pyrometric acid in a weight ratio of 1: 1, 1.5% by weight of ethylenebistamide, 4.0% by weight of abietic acid, 3.5% by weight of dimethylpolysiloxane 2.5% by weight of benzyldimethyldodecylammonium chloride, 2.5% by weight of isodecylisononanoate, 3.5% by weight of zirconium oxide powder having a particle size of less than 0.1 占 퐉, 2.5% by weight of zinc phosphate and the balance of polycarbonate resin ≪ / RTI > wherein the coating material is coated on the substrate. delete delete