KR100667106B1 - A ventilative film having a good diffusion of negative ion and the manufacturing method - Google Patents

Abstract

Provided is an air-permeable film based on a polyolefin resin, which has high anion-emitting activity and a good touch feel, shows excellent tensile strength and elongation, and is useful for diapers and sanitary napkins. The air-permeable film is obtained by the method comprising the steps of: mixing a polyolefin resin with an anion-emitting mineral substance in a ratio of 3:7 to 7:3, adding additives including at least one selected from an antioxidant, processing aid, calcium stearate and titanium dioxide to the resultant mixture in an amount of 0.1-10 wt%, and extruding the resultant product to form a pellet-like master batch; mixing a polyolefin resin, calcium carbonate and additives including at least one selected from an antioxidant, processing aid, calcium stearate and titanium dioxide, melting the mixture, and extruding the molten mixture to form a pellet-like compound; and mixing and melting the master batch with the compound in a weight ratio of 1:1-1:9, extruding the mixture into a film and orienting the film.

Description

Breathable film with high anion dissipation rate and manufacturing method {A VENTILATIVE FILM HAVING A GOOD DIFFUSION OF NEGATIVE ION AND THE MANUFACTURING METHOD}

1 is a flow chart showing a conventional breathable film manufacturing process.

Figure 2 is a flow chart showing a breathable film manufacturing process having a high anion dissipation rate of the present invention.

The present invention relates to a method for producing a breathable film having a high anion dissipation rate.

In general, the factors that determine the performance of the breathable film used in the manufacture of diapers, women's sanitary napkins, such as infants are tactile, tensile strength, elongation.

As a technique for improving the performance of such a breathable film, 'polyethylene resin composition containing calcium carbonate and its manufacturing method' with calcium carbonate as a main component to improve the film surface state and tensile strength (Korea Patent Publication No. 0168622) This was devised.

In addition, the film raw material composition for air permeability excellent in processability and the method for manufacturing the air permeable film using the same, which improves the feel of the film by improving the melt rate of the feedstock in the extruder (Korean Patent Publication No. 10-0358711) He was also drafted.

However, the above technique focuses only on improving the performance of a general breathable film and has no additional effects such as health promotion.

In addition, a technique of making a film by adding a small amount of sterilizing material, anion emitting material, and far infrared emitting material to the raw material to have a health promoting effect has been proposed, but in order to have a nice touch and not to tear, There was a problem that can not be put in large quantities.

The air permeable film having a high anion dissipation rate of the present invention and a manufacturing method thereof are intended to solve such a problem, and an object of the present invention is to provide a breathable film having a large anion dissipation rate and a manufacturing method thereof.

In addition, there is also an object to provide a breathable film having a high anion divergence rate, good touch, tensile strength and elongation and a method of manufacturing the same.

The present invention relates to a breathable film having a high anion dissipation rate and a manufacturing method thereof.

The breathable film of the present invention and a method of manufacturing the same helps to promote health by increasing the anion dissipation rate.

In addition, the anion divergence rate is high, but the feel, tensile strength and elongation rate are good.

In the method for producing a breathable film having a good anion dissipation effect of the present invention, after mixing the polyolefin-based resin and the anion-emitting mineral in the ratio of 3 to 7: 3 to 7 by weight to prepare a mixture, the additive, antioxidant, processing Preparing a masterbatch in pellet form by mixing at least one selected from a preparation, calcium stearate, and titanium dioxide in an amount of 0.1 to 10% by weight based on the weight of the mixture, followed by extrusion; Mixing a polyolefin resin and calcium carbonate with at least one selected from an antioxidant, a processing aid, calcium stearate, and titanium dioxide as an additive to melt the polyolefin resin, and then extruding to prepare a compound in pellet form; The prepared masterbatch and the prepared compound by mixing in a ratio of 1: 1 to 1: 9 by weight to melt and then extruding after stretching to produce a breathable film; consists of.

Hereinafter, a method for producing a breathable film having a good anion divergence effect of the present invention will be described in detail.

Step 1: manufacture the masterbatch

The master batch was melted by mixing 0.1 to 10% by weight of one or more additives selected from antioxidants, processing aids, calcium stearate, and titanium dioxide, 30 to 70% by weight of polyolefin resins, and 30 to 70% by weight of anion emitting minerals. It is then extruded into pellets.

Known anion-emitting minerals include germanium, complex earth, loess, illite, kaolin, titanium, tourmaline, and the like.

The powder of the anion-emitting mineral used in the present invention may use any one of various anion-emitting minerals or a mixed powder of several minerals.

의 분자식을 가지는 인동석이 있다.One example of a preferred anion emitting mineral

There is a phosphorite which has a molecular formula of.

Phosphate was used as a phosphate mineral among anion emitters.

Additives and polyolefin resins are typically used as raw materials for the production of breathable films, and low density polyethylene is typically used among polyolefin resins.

Examples of the additives include titanium dioxide, antioxidants, processing aids, calcium stearate, zinc stearate, and the like, and these additives are known and detailed description thereof will be omitted.

Low Density Polyethylene (LDPE) is commonly used in the manufacture of breathable films and general films and has a density of 0.918 to 0.930 and a crystallinity of 35 to 40%.

An additive, a polyolefin resin, and an anion emitting mineral may be mixed, melted, and then extruded to produce pellets using a known extrusion apparatus.

Second Step: Compound Preparation

The compound is prepared in pellet form by mixing and melting one or more additives selected from antioxidants, processing aids, calcium stearate, titanium dioxide, polyolefin resins, and calcium carbonate, and extruding them.

As the polyolefin resin, a mixture of low density polyethylene and linear low density polyethylene is preferable.

When the compound is prepared, the mixing ratio of calcium carbonate, polyolefin resin, and additives is preferably mixed at 30 to 60:37 to 69.99: 0.01 to 3 with respect to the total weight of the mixture to be 100% by weight.

In other words, calcium carbonate is a mixture of 30 to 60% by weight of the total input material.

Calcium carbonate, which is added during the compound production, is also used during the manufacture of a general film, and calcium carbonate is formed during the stretching process to form pores, thereby providing air permeability to the film.

The additive, polyolefin resin and calcium carbonate may be mixed, melted, and then extruded to produce pellets using a known extrusion device.

Third step: manufacturing breathable film

The masterbatch prepared in the first step and the compound prepared in the second step are mixed, melted, extruded and stretched to prepare a breathable film.

When the compound and the master batch are added to the extrusion apparatus, the loading ratio is preferably 1: 1 to 1: 9 by weight.

The compound and masterbatch were each subjected to one compounding process before being fed into the extruder.

Mixing, melting, extruding and stretching of the masterbatch and the compound may also be carried out using a known extrusion device as described above.

As such, the reason for separating an anion emitting mineral, a calcium carbonate, a polyolefin resin, and an additive from a master batch process based on the anion emitting mineral and a compound manufacturing process without melting, kneading, extruding, or stretching a single process is anion. The inventors of the present invention have found out through various experiments to maximize the anion divergence effect of the divergent mineral.

Hereinafter, the method for producing a breathable film having a good anion divergence effect of the present invention will be described in detail with reference to Examples, but these are not intended to limit the scope of the present invention.

Example 1 Preparation of Breathable Film (Contains 5% by Weight of Master Batch)

2.5 kg of a low density polyethylene powder, a polyolefin resin, 2.4 kg of anion emitting mineral powder, and 0.1 kg of an antioxidant were prepared as an additive.

The prepared material was introduced into a twin screw extrusion apparatus of IKEGAI, Japan, and melted, kneaded, and extruded to prepare 5 kg of a pellet batch.

47 kg of a low density polyethylene and a linear low density polyethylene mixed powder, 47 kg of calcium carbonate, and 1 kg of an antioxidant were prepared as a polyolefin resin.

The prepared material was put into a twin screw extrusion apparatus of IKEGAI company to prepare 95 kg of pellet-type compound through melting, kneading, and extrusion.

The masterbatch 5kg and 95 kg of the compound were mixed, melted and kneaded using a casting extrusion apparatus of the 'Daeyoung Gravure' company to prepare a 100 kg breathable film through a drawing process.

Example 2 Preparation of Breathable Film (Contains 10% by Weight of Master Batch)

As in Example 1, a breathable film was prepared, but a 100 kg breathable film was prepared by preparing 10 kg of master batch and 90 kg of compound so that the mixing ratio of the master batch and the compound was 1: 9.

Example 3 Preparation of Breathable Film (Contains 25% by Weight of Master Batch)

A breathable film was prepared as in Example 1, but a 100 kg breathable film was prepared by preparing 25 kg of master batch and 75 kg of compound so that the mixing ratio of the master batch and the compound was 1: 4.

Example 4 Preparation of Breathable Film (Contains 50% by Weight of Master Batch)

A breathable film was prepared as in Example 1, but 50 kg of the master batch and 50 kg of the compound were prepared such that the mixing ratio of the master batch and the compound was 1: 1. Thus, 100 kg of the breathable film was prepared.

Comparative Example 1 Preparation of Breathable Film without Masterbatch

The compound prepared by adding the material at the mixing ratio of Example 1 was introduced into a casting extrusion apparatus of 'Daeyoung Gravure' company, melted, kneaded, and stretched to prepare a breathable film 100k.

Experimental Example 1 Measurement of Anion Dissipation Rate

The breathable film prepared by the method of Examples 1 to 4 and Comparative Example 1 was measured using an ION TESTER machine (model COM-3010, COM SYSTEM INC, JAPAN) and shown in Table 1.

<Table 1> Comparison of Anion Dissipation Rate

division Anion divergence rate according to the number of measurements (Unit: ION / cc) 1 time Episode 2 3rd time Average divergence rate Example 1 838 915 937 904 Example 2 1209 1454 1328 1330 Example 3 2058 2094 2106 2086 Example 4 2991 3099 3057 3049 Comparative Example 1 12 18 72 34

As shown in the above table, it can be seen that the anion divergence effect is high when a breathable film is prepared including the master batch containing the anion divergence mineral.

Experimental Example 2 Tensile Strength Measurement

The breathable film prepared by the method of Examples 1 to 4 and Comparative Example 1 was measured in the tensile strength using the UTM device of the 'MTS (MTS)' company is shown in Table 2.

<Table 2> Tensile strength comparison table

division MD (g / in, tensile strength in machine direction) CD (g / in, tensile strength in machine direction) Example 1 1330 240 Example 2 1289 235 Example 3 1275 231 Example 4 1266 227 Comparative Example 1 1315 237

As shown in Table 2, when the mixing ratio of the master batch and the compound is 1: 9, the mechanical direction tensile strength of the breathable film is 1,266-1,330 g / in, which is similar to the mechanical direction tensile strength of Comparative Example 1. It can be seen that.

In addition, even in the direction perpendicular to the machine, when the mixing ratio of the master batch and the compound is 1: 9, the tensile strength is 227 to 240 g / in, which is similar to that of the comparative machine 1 in the direction perpendicular to the machine. It can be seen.

Experimental Example 3 Elongation Rate Measurement

The breathable films prepared by the methods of Examples 1 to 4 and Comparative Example 1 were measured in the elongation rate by using the UTM device of the 'MTS' company and are shown in Table 3.

Table 3 Elongation Comparison Table

division MD (%, machine direction elongation) CD (%, Machine Orthogonal Elongation) Example 1 205 346 Example 2 198 340 Example 3 192 335 Example 4 187 324 Comparative Example 1 200 325

As shown in Table 3, when the mixing ratio of the masterbatch and the compound is 1: 9 by weight, the mechanical direction elongation of the breathable film is 187 to 205%, indicating that the mechanical direction elongation of Comparative Example 1 is maintained. Can be.

In addition, in the case of the machine perpendicular direction, when the mixing ratio of the master batch and the compound is 1: 9, the elongation rate is 324 ~ 346%, indicating that the state of the machine perpendicular direction of the comparative example 1 is maintained. .

Experimental Example 4 Film Appearance Measurement

The appearance of the breathable film prepared by the method of Examples 1 to 4 and Comparative Example 1 visually confirmed the surface state of the film is shown in Table 4.

<Table 4> Film Appearance Comparison Table

division Surface condition Example 1 ◎ Example 2 ○ Example 3 ○ Example 4 ○ Comparative Example 1 ○

(◎: Very good, ○: Good, △: Normal, ×: Bad)

As shown in Table 4, it was confirmed that the surface condition of the breathable film was excellent when the mixing ratio of the master batch and the compound was 1: 9 by weight.

According to the present invention, a method for producing a breathable film having a good anion dissipation effect is provided.

Moreover, the manufacturing method of the air permeable film which has good anion dissipation effect, good touch, and excellent tensile strength and elongation is provided.

Claims (4)

In the method for producing a breathable film, After mixing the polyolefin-based resin and the anion-emitting mineral in the ratio of 3 to 7: 3 to 7 by weight, to prepare a mixture, at least one selected from the antioxidant, processing aid, calcium stearate, titanium dioxide as an additive to the mixture Mixing 0.1 to 10 wt% of the mixture by weight to melt and then extruding to prepare a masterbatch in pellet form; Mixing a polyolefin resin and calcium carbonate with at least one selected from an antioxidant, a processing aid, calcium stearate, and titanium dioxide as an additive to melt the polyolefin resin, and then extruding to prepare a compound in pellet form; Composed of a prepared master batch and the prepared compound in a ratio of 1: 1 to 1: 9 by weight to melt and then extruding and stretching to produce a breathable film; consisting of, A method for producing a breathable film having a high anion dissipation rate. The method of claim 1, When preparing the compound, characterized in that the input ratio of calcium carbonate is 30 to 60% of the weight of the total input material, A method for producing a breathable film having a high anion dissipation rate. The method of claim 1, The anion-emitting mineral powder is characterized in that the germanium, complex earth, ocher, illite, kaolin, one powder selected from the group consisting of tourmaline or two or more mixed powder, A method for producing a breathable film having a high anion dissipation rate. delete

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