KR19990015024A - Manufacturing Method of Biodegradable Packaging Film for Phone Card - Google Patents

Abstract

The present invention provides a number average obtained by polycondensing at least one acid component monomer selected from dicarboxylic acid represented by Formula 1, its ester derivative or anhydride thereof, and at least one diol component monomer selected from diol represented by Formula 2 below. 55 to 85 parts by weight of synthetic biodegradable polymers mainly composed of biodegradable aliphatic polyester having a molecular weight of 20,000 to 70,000 and a melt flow index (190 ° C., 2,160 g) of 50 or less and 45 to 15 parts by weight of one or more of organic or inorganic fillers. It relates to a method for producing a biodegradable packaging film containing, the biodegradable packaging film for a phone card made of such a composition can be completely decomposed can lead to stabilization of the soil when the soil landfilled after use.

(In Formula 1, R, R ¹ is hydrogen or a methyl group, n is 2 to 8)

(M in the general formula (2) is 2 to 6)

Description

Manufacturing Method of Biodegradable Packaging Film for Phone Card

The present invention relates to a method for manufacturing a biodegradable packaging film for a phone card, and more particularly, biodegradable aliphatic polyester and organic or inorganic prepared by the Korean Patent Application No. 92-23688 filed by the applicant of the main component It relates to a method for producing a biodegradable packaging film obtained by mixing the filler.

The packaging material of the currently used phone card is polypropylene (OPP), which has many problems in disposal after use.

Phone cards with these packaging materials are not decomposed when they are landfilled.Incinerators are burned by incinerators due to the high heat of combustion and the hydrogen chloride gas emitted by the combustion of halogen compounds such as polychlorinated biphenyl (PCB). Is corrosive and causes difficulties such as causing air pollution (dioxin). In addition, the packaging film is difficult to collect when discarded, it is also impossible to recycle.

Therefore, an object of the present invention is to produce a biodegradable packaging film that can be completely decomposed so that when the phone card discarded together with the household waste is embedded in the soil, it can be decomposed like household waste and cause stabilization of the soil.

The present invention relates to a method for manufacturing a disposable phone card packaging film mainly composed of fully biodegradable polyester, which has been developed by the present applicant and filed by Korean Patent Application No. 92-23688. A number average molecular weight of 20,000 to 70,000, a melt flow index formed by polycondensing at least one acid component monomer selected from dicarboxylic acid, ester derivative or anhydride thereof, and at least one diol component monomer selected from diol of formula (2) (190 ℃, 2160g) A biodegradable packaging for phone cards containing 55 to 85 parts by weight of synthetic biodegradable polymers containing 50 or less biodegradable aliphatic polyester and 45 to 15 parts by weight of organic or inorganic fillers. A method for producing a film.

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

In the present invention, the biodegradable aliphatic polyester has a number average molecular weight of 20,000 to 70,000, more preferably 25,000 to 45,000, and a melt flow index (190 ° C., 2,160 g) of 50 or less is suitable. One having linear or branched structure or one or more acid component monomers of methyl or ethyl ester of acid, aliphatic diol of formula (2) or one having linear or branched structure such as neopentyl glycol or 1,2-butanediol The above diol monomers are used.

In addition, the synthetic biodegradable polymer is the above-mentioned biodegradable aliphatic polyester itself, or a polyhydric oxycarboxylic acid such as glycerin, glycidol, pentaerythres and the like or polyhydric oxycarboxylic acid or malic acid (Malic acid) or anhydride thereof. It is crosslinked using 0.01-5 mol% to 100 mol% of the aliphatic dicarboxylic acid or its anhydride component of Formula 1, or the coupling agent, such as diisocyanate and diepoxide, is combined, and It satisfies a property (Hereinafter, both an inner layer and an outer layer refer to the film layer of a state before rewind).

1) The tensile strength of the aliphatic polyester film used for the inner layer should be more than 300㎏ / ㎠ for both MD and TD.

2) The saddle strength of the aliphatic polyester film used for the outer layer should be more than 250㎏ / ㎠ for both MD and TD.

3) The elongation of the aliphatic polyester single film used in the inner layer includes a film of 150% or more in both MD and TD.

4) The elongation of the aliphatic polyester alone film used for the outer layer includes a film of 450% or more in both MD and TD.

5) The tear strength of the aliphatic polyester single film used for the inner layer includes 50 kg / cm (ASTM D 1004 measuring method) or more.

6) The tear strength of the aliphatic polyester single film used for the outer layer includes one of 150 kg / cm or more.

7) Film whose inner layer and outer layer occupy for the whole film thickness to 80-90: 20-10.

8) The film thickness of the finished product is 25 micrometers-100 micrometers.

In addition to the above components, a catalyst, stabilizer, and the like which are ordinary additives can be added to the composition.

Tetrabutyl titanate is suitably used as the catalyst for esterification and aliphatic aliphatic acid and aliphatic diol, and stabilizer is used for polycondensation, and trimethyl phosphate, cobalt acetate, dibutyldine oxide, and the like are preferable. .

In the present invention, in the production of a fully biodegradable packaging film for a telephone card using a fully biodegradable aliphatic polyester resin prepared mainly from biodegradable aliphatic polyester, workability such as adhesion and cutting properties are required. A film having a multi-layer structure including a layer or more structure has been developed.

In the present invention, a blown film is manufactured by using an extruder having a double or triple structure, and is divided into outer layers and inner layers, and the outer layer and the inner layer are simultaneously extruded during the extrusion process. The ratio is extruded to 10 to 20 parts by weight: 90 to 80 parts by weight.

In consideration of workability during film production, the inner layer uses 80 to 90 parts by weight of a resin having a melting point of 90 to 130 ° C., more preferably of 100 to 120 ° C., which has a high crystallization rate. Do. In addition, in order to improve the adhesiveness of a film, an outer layer uses 10-20 weight part of resin of melting | fusing point 60-90 degreeC, More preferably, 75-85 degreeC.

In addition, organic fillers or inorganic fillers are used to improve the cutting property of the film, wherein the ratio of the synthetic biodegradable polymer: filler is 55 to 85 parts by weight: 45 to 15 parts by weight, and more preferably 65 to 75 parts by weight. It is 35-25 weight part, and when it exceeds this range, cutting property will be bad.

As such a filler, general starch and modified starch, chitosan, lignin, palm tree bark, rhodium bark, clam bark, ginkgo leaf and the like, calcium carbonate, talc, etc. disclosed in Korean Patent Application 93-29542 may be used, more preferably. Starch with an amylose content of 20% or more, waxy corn starch with 100% amylopectin, and calcium carbonate are suitable.

With the above composition, the outer layer partial extrusion temperature during the manufacture of the multilayer blown film is maintained at 80 to 140 ° C, preferably 90 to 120 ° C. If the extrusion temperature exceeds 140 ℃, the resin is lowered due to the thermal decomposition of the viscosity is lowered the physical properties and workability of the film, if less than 80 ℃ the resin is not melted and film molding is impossible. The inner layer extrusion temperature is preferably 110 to 160 ° C, preferably 120 to 140 ° C.

In addition, when bonding the inner layer and the outer layer, the blown film is cut on the basis of the actual phone card size, and then the outer layer is rewound to the inner layer to the outside, and the bonding temperature is 50 to 90 ° C, preferably 65 to Joining is carried out using the bonding machine holding 75 degreeC.

Hereinafter, the present invention will be described in more detail with reference to Examples. However, the present invention is not limited to the examples.

The blown film used in the following Examples and Comparative Examples was prepared in the same manner as in Example 1, and was observed after 2 months of embedding in a soil having a thickness of 40 ㎛ for biodegradability test.

<Example 1>

◆ Preparation of aliphatic polyester for outer layer:

In a hot melt condensation reaction tube, 1.090 g of succinic acid, 700 g of adipic acid, 1,260 g of 1,4-butanediol, and 0.7 g of tetrabutyl titanate were mixed and the temperature was maintained at 200 ° C. in a nitrogen stream. The reaction mixture is heated until the theoretical amount of water flows out. After the completion of the ester reaction, 0.7 g of tetrabutyl titanate as a catalyst, 2 g of trimethyl phosphate as a stabilizer, 0.2 g of cobalt acetate, and 4 g of dibutyl tin oxide were added in a slurry to 1,4-butanediol, and then the mixture was mixed at 10O &lt; 0 &gt; C. After mixing well for a minute, the temperature was gradually elevated to 250 ° C., and the pressure was 0.3 mmHg, followed by condensation polymerization for 4 hours, and then discharged to obtain a completely biodegradable aliphatic polyester resin. Melting | fusing point (Tm) of this resin was 80 degreeC, and 10 weight part of this resin was used for the outer layer film.

◆ Preparation of aliphatic polyester for inner layer:

The aliphatic polyester resin for inner layer was prepared through the same reaction process as the aliphatic polyester for the outer layer except that 1.180 g of succinic acid and 1,260 g of 1,4-butanediol were used in the hot melt condensation reaction tube. 115 ° C.

◆ Packaging Film Forming Method:

70 parts by weight of this resin and 30 parts by weight of calcium carbonate were mixed and extruded into the inner layer, and the outer layer was adjusted to an aliphatic polyester (Tm: 80 ° C.) extrusion rate so that the outer layer and the inner layer were blown to obtain a film thickness of 10:90. Molded. At this time, the thickness of the film was 40 μm. The film was rewound again by changing the outer layer and the inner layer, and then bonded at about 70 ° C. to produce a final packaging film.

<Example 2>

It was the same as Example 1 except 30 parts by weight of corn starch (containing 25% amylose) was used instead of calcium carbonate.

<Comparative Example 1>

Same as Example 1 except that 5 parts by weight of calcium carbonate was used for the inner layer.

<Comparative Example 2>

Same as Example 1 except that 60 parts by weight of calcium carbonate was used for the inner layer.

<Comparative Example 3>

The same process as in Example 1 was carried out except that the film was prepared with a resin having a melting temperature of 80 ° C. as a blown film.

<Comparative Example 4>

The same process as in Example 1 except that the resin having a melting temperature of 80 ° C. was not used in the manufacture of the blown film and only the melting temperature of 115 ° C. was used for the inner and outer layers.

<Comparative Example 5>

It is the same as Example 1 except the junction temperature was 120 degreeC.

<Reference example>

Packaging film for phone card packaging made by working with the existing polypropylene (OPP) film production method.

Tm (℃) Tensile Strength (㎏ / ㎠) % Elongation Tear strength (㎏ / ㎠) Inner layer resin 115 410 220 80 Insect repellent 80 320 700 240

Outer layer (Tm) Inner layer (Tm) Machinability Adhesive Biodegradable Film workability Example 1 80 ℃ 115 ℃ Good Good Complete decomposition Good Example 2 80 ℃ 115 ℃ Good Good Complete decomposition Good Comparative Example 1 80 ℃ 115 ℃ Bad Good Complete decomposition Good Comparative Example 2 80 ℃ 115 ℃ Bad Good Complete decomposition Good Comparative Example 3 115 ℃ 80 ℃ Good Bad Complete decomposition Good Comparative Example 4 115 ℃ 115 ℃ Good Bad Complete decomposition Good Comparative Example 5 80 ℃ 115 ℃ Good Bad Complete decomposition Good Note Yes 165 ℃ 165 ℃ Good Good Not disassembled Good

※ Workability refers to the film in the state before rewinding.

The packaging film produced by the present invention, as shown in the above table, not only has good cutting properties, adhesiveness, workability, but also may cause stabilization of the soil since it is completely decomposed when the soil is used after use.

Claims (5)

A number average molecular weight of 20,000 to 70,000, melted by polycondensing at least one acid component monomer selected from dicarboxylic acid of formula (1), its ester derivative or anhydride thereof and at least one diol component monomer selected from diol of formula (2) Biodegradation for phone cards characterized by containing 55 to 85 parts by weight of synthetic biodegradable polymers mainly composed of biodegradable aliphatic polyester having a flow index (190 ° C., 2,160 g) of 50 or less and 45 to 15 parts by weight of organic or inorganic fillers. Method for producing a packaging film. A number average molecular weight of 20,000 to 70,000, melted by polycondensing at least one acid component monomer selected from dicarboxylic acid of formula (1), its ester derivative or anhydride thereof and at least one diol component monomer selected from diol of formula (2) Biodegradable packaging film for a phone card, characterized in that a biodegradable multilayer blown film is produced by using a biodegradable aliphatic polyester composed mainly of biodegradable aliphatic polyester having a flow index (190 ° C, 2,160g) of 50 or less. Manufacturing method. The method of manufacturing a biodegradable packaging film for a phone card according to claim 2, wherein the inner layer uses 80 to 90 parts by weight of the resin having a melting point of 90 to 130 DEG C and the outer layer uses 10 to 20 parts by weight of the resin having a melting point of 60 to 90 DEG C. Way The method of manufacturing a biodegradable packaging film for a telephone card according to claim 2, wherein the outer layer partial extrusion temperature is 80 to 140 ° C and the inner layer partial extrusion temperature is 110 to 160 ° C. The method of manufacturing a biodegradable packaging film for a telephone card according to claim 2, wherein the bonding temperature between the outer layer and the inner layer is 50 to 90 ° C.