KR102571439B1 - Automated manufacturing method of polyester product and container by them - Google Patents

Abstract

The present invention relates to an automated production method for polyester products and a container manufactured therefrom, and more specifically, to film, fiber, and other various uses, the product can be developed without restrictions, and the process efficiency is excellent while crystallization and melting point control are easy. It relates to an automated production method of polyester products exhibiting one effect and a container manufactured through the same.

Description

Automated manufacturing method of polyester product and container by them}

The present invention relates to an automated production method for polyester products and a container manufactured therefrom, and more specifically, to film, fiber, and other various uses, the product can be developed without restrictions, and the process efficiency is excellent while crystallization and melting point control are easy. It relates to an automated production method of polyester products exhibiting one effect and a container manufactured through the same.

Polyester resins have low drapability, soft feel, hygroscopicity, color transferability and natural feel, but high strength, excellent processability and shape stability, and low price. It is used for various purposes such as film and bottle.

Among conventional polyesters, in particular, PET has excellent chemical resistance, heat resistance, weather resistance, high strength, and high modulus of elasticity, and is used in large quantities for industrial fibers, films, containers, and general molded products, but does not impair the excellent performance of polyester. Many attempts have been made to obtain a co-polyester having new properties such as high shrinkage by copolymerizing a third component within a range not specified.

A lot of techniques for manufacturing high-shrinkage PET fibers are known, but industrially useful and currently most used methods use carboxylic acids such as adipic acid and sebacic acid, which are acidic components, in the polymerization process of polymers, or alcohol components Instead of phosphorus ethylene glycol, a method of copolymerization using higher glycols or substituted glycols such as diethylene glycol, 2,2-dimethyl-1,3 propanediol, and 2,2-diethyl-1,3 propanediol is used. . This method is a method of forming many amorphous parts in the fiber structure. Among them, when adipic acid, sebacic acid or the above diol is used, the glass transition temperature is lowered and shrinkage occurs at low temperature.

The prior art discloses fibers formed from blends of modified aliphatic-aromatic copolyesters and thermoplastic starches. However, the method for improving the physical properties of the copolyester resin as described above has problems in that it is difficult to improve the properties of the resin itself and it is difficult to develop research functions. In addition, there are problems in that it is difficult to develop products without restrictions for various uses other than films and fibers, process efficiency is not good, and crystallization and melting point control are not easy.

KR 2011-0015424 B1 (registration date 2015.12.08)

The present invention has been devised to solve the above problems, and it is possible to develop products without restrictions for various uses other than the film and fiber to be solved by the present invention, and shows the effect of easy crystallization and melting point control at the same time as excellent process efficiency It is to provide an automated production method of polyester products and a container manufactured therethrough.

In order to solve the above problems, the present invention includes a PET component and a PEI component in a weight ratio of 95: 5 to 55: 45, the PET component and the PEI component are blended without copolymerization, and the PET component has an intrinsic viscosity of 0.5 ~ 0.7 dl/g, and the PEI component provides a PET container having an intrinsic viscosity of 0.73 ~ 1.0 dl/g.

According to a preferred embodiment of the present invention, the fusion index measured by the following measurement method 1 may be 0.4 to 3.5.

[Measurement method 1]

The mixture of the PET component and the PEI component was mixed in a ratio of 20:80 based on the total amount of the mixture of 30 g, mixed well, and then placed in an aluminum dish having a diameter of 10 cm. It was crystallized into pellets in a hot air oven at 160 ° C. for 30 minutes, and the degree of fusion was quantitatively evaluated through a free fall test method. First, after sealing the aluminum dish containing the crystallized composition for 30 minutes at 160 ° C, it was free-falled twice from a height of 80 seconds, and after the seal was released, the weight of a lump in which four or more PET pellets were fused together was expressed as a percentage of the total weight And it was expressed as a fusion index. The pellets had a cross-sectional diameter of 0.5 mm and a height of 0.3 mm.

According to another preferred embodiment of the present invention, the difference in intrinsic viscosity between the PET component and the PEI component may be 0.13 dl/g or more.

Meanwhile, in order to solve the above problems, the present invention provides (1) determining the mixing ratio of PET and PEI according to the purpose, (2) preparing a mixture by mixing the PET and PEI according to the determined mixing ratio, and (3) ) The mixture is processed for each purpose to produce a polyester product, but PET and PEI included in the polyester product are not copolymerized and blended, providing an automated production method for a polyester product.

According to a preferred embodiment of the present invention, if the use is a heat-shrinkable film, the mixture may include PET and PEI in a weight ratio of 95:5 to 65:35.

According to another preferred embodiment of the present invention, the heat-shrinkable film may have a shrinkage rate of 8.5 to 20% at 60° C. according to the following relational expression 1.

[Relationship 1]

According to another preferred embodiment of the present invention, the heat-shrinkable film may have a shrinkage rate of 38 to 57% at 80° C. according to the following relational expression 1.

[Relationship 1]

According to another preferred embodiment of the present invention, the heat-shrinkable film may have a glass transition temperature (Tg) of 64°C to 72°C.

According to another preferred embodiment of the present invention, the heat-shrinkable film may have a contraction initiation temperature of 61°C to 65°C.

According to another preferred embodiment of the present invention, the difference in intrinsic viscosity between the PEI and the PET may be 0.13 dl/g or more.

According to another preferred embodiment of the present invention, the mixture may have an intrinsic viscosity of 0.6 to 0.8 dl/g.

According to another preferred embodiment of the present invention, if the use is a PET container, the mixture may include PET and PEI in a weight ratio of 95:5 to 55:45.

According to another preferred embodiment of the present invention, the PET container may have a fusion index of 0.4 to 3.5 as measured by measurement method 1 below.

[Measurement method 1]

The mixture of the PET component and the PEI component was mixed in a ratio of 20:80 based on the total amount of the mixture of 30 g, mixed well, and then placed in an aluminum dish having a diameter of 10 cm. It was crystallized into pellets in a hot air oven at 160 ° C. for 30 minutes, and the degree of fusion was quantitatively evaluated through a free fall test method. First, after sealing the aluminum dish containing the crystallized composition for 30 minutes at 160 ° C, it was free-falled twice from a height of 80 seconds, and after the seal was released, the weight of a lump in which four or more PET pellets were fused together was expressed as a percentage of the total weight And it was expressed as a fusion index. The pellets had a cross-sectional diameter of 0.5 mm and a height of 0.3 mm.

According to another preferred embodiment of the present invention, step (2) may be performed at 250 ° C. to 290 ° C. for 5 to 15 minutes at 60 to 140 rpm.

On the other hand, in order to solve the above problems, the present invention is a first input unit for introducing PET components, a second input unit for introducing PEI components, and a mixing unit that communicates with the first input unit and the second input unit and mixes the input components. Provides an automated production device for polyester products, including a unit, and adjusting the weight ratio by adjusting the amount of components input from the first input unit and the second input unit according to the designated use, but the PET and PEI are not copolymerized but blended. do.

According to a preferred embodiment of the present invention, a processing unit for processing the mixture mixed in the mixing unit for each purpose; may further include.

The automated production method of the polyester product of the present invention and the container manufactured through it can be used without restrictions for various uses other than film and fiber, and have excellent process efficiency and easy crystallization and melting point control.

1 is a schematic diagram of an automated process according to a preferred embodiment of the present invention.

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

As described above, conventionally disclosed fibers formed from blends of modified aliphatic-aromatic copolyesters and thermoplastic starches. However, the method for improving the physical properties of the copolyester resin as described above has problems in that it is difficult to improve the properties of the resin itself and it is difficult to develop research functions. In addition, there are problems in that it is difficult to develop products without restrictions for various uses other than films and fibers, process efficiency is not good, and crystallization and melting point control are not easy.

Accordingly, the present invention solves the above problems by providing a PET container comprising a PET component and a PEI component, wherein the PET component and the PEI component are blended without copolymerization, and the PET component and the PEI component exhibit a specific intrinsic viscosity. sought. Through this, unlike the conventional invention, it is possible to develop products without restrictions for various uses other than films and fibers, and to achieve excellent process efficiency and easy crystallization and melting point control.

First, a method for automatically producing a polyester product according to the present invention will be described.

The automated production method of the polyester product of the present invention includes (1) determining the mixing ratio of PET and PEI according to the purpose, (2) preparing a mixture by mixing the PET and PEI according to the determined mixing ratio, and (3) ) processing the mixture for each purpose.

1 is a schematic diagram of an automated process according to a preferred embodiment of the present invention, wherein FIG. 1a shows a step of determining a mixing ratio, FIG. 1b shows a step of preparing a mixture, and FIG. 1c shows a step of processing by use.

First, step (1) of determining the mixing ratio of PET and PEI according to the application will be described.

The use is not limited as long as it can be manufactured according to the mixing ratio, and preferably may be one or more uses selected from heat-shrinkable films, heat-shrinkable labels, and PET containers.

If the use is a heat-shrinkable film or heat-shrinkable label, the mixing ratio of the PET and PEI may be 95:5 to 65:35, preferably 93:7 to 67:33. If the use is a heat-shrinkable film or heat-shrinkable label, if the PEI in the weight ratio of PET and PEI is less than 5, the problem of excessively high heat shrinkage initiation temperature may occur, and if the PEI in the weight ratio of PET and PEI exceeds 30, the temperature Shrinkage rate and shrinkage onset temperature are lowered, which may cause problems not suitable for heat-shrinkable films or heat-shrinkable labels.

And, if the use is a PET container, the mixing ratio of the PET and PEI may be 95:5 to 55:45, preferably 90:10 to 50:40. If the use is a PET container, if the PEI in the weight ratio of PET and PEI is less than 5, transparency and moldability may deteriorate, and if the PEI in the weight ratio of PET and PEI exceeds 45, the fusion index is excessively high , problems that are not suitable for manufacturing PET containers may occur.

Next, (2) a step of preparing a mixture by mixing the PET and PEI according to the determined mixing ratio will be described.

The step of preparing the mixture is performed at 250 ° C. to 290 ° C. for 5 to 15 minutes at 60 to 140 rpm, preferably at 255 ° C. to 285 ° C. for 5 to 10 minutes at 70 to 130 rpm. can If the temperature in the step of preparing the mixture is less than 250 ° C, PET and PEI may not mix well, and if it exceeds 290 ° C, a thermal decomposition effect occurs and the viscosity is lowered, and workability in the post-processing process is reduced. This non-smooth issue can occur. In addition, if the time for preparing the mixture is less than 5 minutes, PET and PEI may not be mixed well, and if it exceeds 15 minutes, the viscosity may be lowered due to the thermal decomposition effect and poor post-processability may occur. there is. In addition, if the stirring speed in the step of preparing the mixture is less than 60 rpm, PET and PEI may not be mixed well, and if it exceeds 140 rpm, there may be a problem of not mixing uniformly due to excessive stirring speed. there is.

Next, (3) the step of processing the mixture for each purpose will be described.

In the step of processing the mixture for each use, when the use is a heat-shrinkable film or heat-shrinkable label, a mixture obtained by mixing PET and PEI in a weight ratio of 95:5 to 65:35 may be processed into a film form. Specifically, after drying the mixture under high vacuum, melt-extrusion at 200 ° C. to 300 ° C. to prepare a molten sheet, which is then cooled and solidified to obtain a sheet. After passing through the stretching frame in the mechanical direction (MD) and the direction orthogonal to the main shrinkage direction, the sheet is preheated in the tender at 80 ° C to 100 ° C, the stretching temperature is 60 ° C to 90 ° C, and the stretching ratio is 3.0 to 4.0 times. Thereafter, it may be prepared by performing heat treatment at 20 ° C to 100 ° C, but is not limited thereto.

In addition, when the use is a PET container, a pellet prepared by solid-state polymerization of a mixture obtained by mixing PET and PEI at a weight ratio of 95: 5 to 55: 45 may be manufactured into a PET container. Specifically, an injection blow molding method may be applied as a method for manufacturing a PET bottle. This injection blow molding method is a molding method for making a hollow product like a bottle, and is also called blue o molding. A PET container may be manufactured by pre-forming a resin pipe by an extrusion method or an injection method, inserting it into a mold, and then blowing compressed air into the resin pipe to expand it, but is not limited thereto.

The present invention includes a first input unit for injecting the PET component, a second input unit for inputting the PEI component, and a mixing unit for mixing the input components communicating with the first and second input units, Provided is an automated production apparatus for polyester products that adjusts the weight ratio by adjusting the amount of components input from the first input unit and the second input unit.

It will be described in more detail with reference to FIG. 1 attached below. 1 is a schematic diagram 100 of an automated process according to a preferred embodiment of the present invention, wherein the automated production apparatus includes a first input unit 110 into which PET components are introduced and a second input unit 120 into which PEI components are input. ).

The first input unit 110 and the second input unit 120 may be used without limitation in shape and/or specifications as long as the input unit has a shape and/or dimensions that are easy to insert the PET component and the PEI component.

Meanwhile, according to the purpose, the first input unit 110 and the second input unit 120 input the PET component and the PEI component. For example, when preparing a heat-shrinkable film, the PET component and the PEI component are mixed at a ratio of 95:5 to 95:5. It is added at a weight ratio of 65: 35, and in the case of manufacturing a PET container, the PET component and the PEI component may be added at a weight ratio of 95: 5 to 55: 45.

Thereafter, PET and PEI are mixed in the mixing unit 130 communicating with the first input unit 110 and the second input unit 120. At this time, the PET and PEI may be blended without copolymerization. In addition, the mixing unit for mixing the input components is not limited as long as it is a mixing unit that can normally mix PET and PEI. In addition, the mixing unit may include a temperature control unit capable of adjusting the temperature of the input components and a stirring unit capable of stirring the input components, but is not limited thereto.

Next, the mixture mixed in the mixing unit 130 goes through a processing step 140 in a processing unit for processing for each purpose. The processing step 140 is the same as the above-described processing step for each use, so detailed descriptions thereof will be omitted.

On the other hand, the automated production apparatus for polyester products of the present invention may further include a storage unit for storing and distinguishing the polyester products processed by use in the processing unit.

Meanwhile, the heat-shrinkable film manufactured by the automated production method and apparatus for polyester products may have a shrinkage rate of 8.5 to 20%, preferably 8.8 to 18%, according to the following relational expression 1 at 60°C. If the shrinkage rate is less than 8.5%, problems such as wrinkles and bounce due to heat shrinkage may occur, which are not suitable for heat-shrinkable films because the shrinkage amount is small, and if the shrinkage rate exceeds 20%, problems such as film thickness deviation occur may occur.

[Relationship 1]

In addition, the heat-shrinkable film may have a shrinkage rate of 38 to 57%, preferably 39 to 56%, according to the relational expression 1 at 80°C. If the shrinkage rate is less than 38%, problems such as wrinkles and bounces due to heat shrinkage, which are not suitable for heat-shrinkable films, may occur, and if the shrinkage rate exceeds 57%, film thickness deviation may occur. Problems can arise.

On the other hand, when measuring the thermal shrinkage of the relational expression 1, the film was measured as a film having a horizontal and vertical length of 10 cm × 10 cm and a thickness of 155 μm.

In addition, the heat-shrinkable film may have a glass transition temperature (Tg) of 64°C to 72°C, preferably 65°C to 71°C. If the glass transition temperature is less than 64 ° C, shrinkage occurs at a low temperature, so when stored at high temperatures in summer, problems such as dimensional change and stability over time may be weak, and if the glass transition temperature exceeds 72 ° C, heat shrinkage Since a high temperature is required for this, a problem that is not suitable for a heat-shrinkable film may occur.

In addition, the heat-shrinkable film may have a shrinkage start temperature of 61°C to 65°C, preferably 62°C to 64°C. By lowering the start temperature of shrinkage, heat shrinkage is possible at a low temperature, and shrinkage speed can be easily controlled to reduce molding defects. However, if the temperature is too low, excessive heat shrinkage may occur. If the temperature exceeds 65° C., a high temperature is required for heat shrinkage, which may cause a problem that is not suitable for a heat shrinkable film.

According to a preferred embodiment of the present invention, the PET container of the present invention may have a fusion index of 0.4 to 3.5, preferably 0.5 to 3.4, as measured by measurement method 1 below.

[Measurement method 1]

The mixture of the PET component and the PEI component was mixed in a ratio of 20:80 based on the total amount of the mixture of 30 g, mixed well, and then placed in an aluminum dish having a diameter of 10 cm. It was crystallized into pellets in a hot air oven at 160 ° C. for 30 minutes, and the degree of fusion was quantitatively evaluated through a free fall test method. First, after sealing the aluminum dish containing the crystallized composition for 30 minutes at 160 ° C, it was free-falled twice from a height of 80 seconds, and after the seal was released, the weight of a lump in which four or more PET pellets were fused together was expressed as a percentage of the total weight And it was expressed as a fusion index. The pellets had a cross-sectional diameter of 0.5 mm and a height of 0.3 mm.

If the fusion index is 0.4, there is almost no fusion, and a problem in that it is not easy to manufacture a PET container may occur. If the fusion index exceeds 3.5, fusion between pellets occurs during drying and crystallization during solid phase polymerization, Not only is it impossible to polymerize properly, but the degree of polymerization of the product is very large, and in some cases, color deterioration may occur, resulting in a decrease in product value and a decrease in workability during post-processing.

Meanwhile, the PET component used in the present invention has an intrinsic viscosity of 0.5 to 0.7 dl/g, preferably 0.55 to 0.69 dl/g, and the PEI component has an intrinsic viscosity of 0.73 to 1.0 dl/g, preferably 0.73 to 1.0 dl/g. Preferably, the intrinsic viscosity may be 0.75 to 0.9 dl/g. If the intrinsic viscosity of the PET component and the PEI component is out of the above range, problems such as poor workability in the post-processing process and low strength of the product due to the low polymerization degree limit the use of industrial fibers. can happen

In order to use polyester as a beverage container molding material or industrial fiber material such as tire cord, it is necessary to increase the strength, and it is known that it is effective to increase the molecular weight and polymerization degree of polyester to increase the strength of polyester. The degree of polymerization of polyester can be expressed by intrinsic viscosity, and it is generally preferable to use high polymerization degree polyester for beverage molding.

Meanwhile, according to a preferred embodiment of the present invention, the intrinsic viscosity of the mixture of PET and PEI may be 0.6 to 0.8 dl/g. If the intrinsic viscosity of the mixture is less than 0.6 dl/g or greater than 0.8 dl/g, processability may significantly deteriorate.

On the other hand, the PEI can be used without limitation as long as it can produce PEI having an intrinsic viscosity of 0.73 to 1.0 dl/g, and preferably, isophthalic acid and ethylene glycol are used in a ratio of 1: 0.7 to 1.4, preferably 0.8 to 1.2. The mixture is mixed in a weight ratio of 200 ° C to 250 ° C, preferably at 220 ° C to 250 ° C to prepare an esterification reaction product. After the esterification reaction, the second step of the polycondensation reaction is carried out. Preferably, it can be prepared by carrying out the polycondensation reaction at 270 ° C. to 288 ° C., but is not limited thereto.

In addition, at least one selected from titanium, germanium, and antimony compounds may be used as the catalyst, preferably an antimony compound, and more preferably antimony trioxide. In addition, as the stabilizer, at least one selected from among phosphoric acid, trimethyl phosphate, triethyl phosphate, and preethyl phosphonoacetate may be used, and phosphoric acid may be preferably used.

Hereinafter, the present invention will be described through the following examples. At this time, the following examples are only presented to illustrate the invention, and the scope of the present invention is not limited by the following examples.

[ Example ]

preparation example 1: PET Preparation

A homopolyester chip was used as PET.

preparation example 2 : PEI manufacturing

Isophthalic acid and ethylene glycol were mixed in a weight ratio of 1:1, and an esterification reaction product was prepared at a temperature of 250°C. Thereafter, 300 ppm of antimony trioxide and 200 ppm of phosphoric acid as a stabilizer were added to the esterification reaction product, and a polycondensation reaction was performed at 285° C. to prepare PEI having an intrinsic viscosity of 0.81 dl/g.

Example One : heat shrinkable PET for film/ PEI preparation of mixtures

PET of Preparation Example 1 and PEI of Preparation Example 2 were introduced at a weight ratio of 90:10 to the mixing unit communicating with the input units through the first input unit and the second input unit, respectively. Then, a PET/PEI mixture for a heat-shrinkable film was prepared by stirring at 270° C. for 5 minutes at 100 rpm.

Example 2 to 5 and comparative example One

It was prepared in the same manner as in Example 1, but a PET/PEI mixture was prepared by changing the weight ratio of PET and PEI as shown in Table 1 below.

Experimental Example 1: Evaluation of PET/PEI mixture for heat-shrinkable film

(1) glass transition temperature ( Tg ) measurement

The PET/PEI mixture prepared according to Examples 1 to 5 and Comparative Example 1 was dried under high vacuum, melted and extruded at 250° C. to prepare a molten sheet, and then cooled and solidified to prepare a sheet. Thereafter, the sheet was stretched at an aspect ratio of 1:3.5 at 75°C, and a heat treatment was performed at 60°C to prepare a film.

The glass transition temperature of 5 mg of the film was measured using a differential scanning calorimeter (DSC 220, Seiko Electronics Co., Ltd.) and is shown in Table 1 below.

(2) Heat shrink onset temperature and heat shrinkage rate measurement

The PET/PEI mixture prepared according to Examples 1 to 5 and Comparative Example 1 was dried under high vacuum, melted and extruded at 250° C. to prepare a molten sheet, and then cooled and solidified to prepare a sheet. Thereafter, the sheet was stretched at an aspect ratio of 1: 3.5 at 75 ° C, heat-treated at 60 ° C to produce a film having a thickness of 130 to 180 μm, and then cut in the forward direction with an area of 10 cm × 10 cm and a temperature of 60 ° C. After primary immersion in each of ℃ and 80 ° C. hot water for 10 seconds, leaving at room temperature for 25 seconds, and performing secondary immersion for 10 seconds, the thermal shrinkage rate was measured by the following relational expression 1.

In addition, the heat shrinkage initiation temperature was measured by measuring the temperature at which shrinkage occurs when measuring the sample in the same manner as the thermal shrinkage rate measurement method. This is shown in Table 1 below.

[Relationship 1]

division PET and PEI
Mixing ratio (weight ratio) glass transition temperature
(℃) Heat shrink start temperature
(℃) 60℃ Shrinkage (%) Shrinkage at 80℃ (%) Example 1 90:10 70 64 17 55 Example 2 80:20 68 63 15 50 Example 3 70:30 65 62 9 40 Example 4 97:3 72 68 18 56 Example 5 60:40 63 60 4 29 Comparative Example 1 100:0 74 72 19 57

As can be seen from Table 1, Examples 1 to 3 satisfying the weight ratio of PET and PEI of the present invention showed excellent effects compared to Examples 4 to 5 and Comparative Example 1, which did not satisfy this.

Specifically, Example 1 in which the weight ratio of PET and PEI is 90:10, Example 2 in which the weight ratio is 80:20, and Example 3 in which the weight ratio is 70:30 are more heat shrinkable than Example 4 in which the weight ratio is 97:3. The onset temperature was low. Example 4 had a high shrinkage rate according to temperature, but had a problem in that the heat shrinkage onset temperature was high.

In addition, Example 1 in which the weight ratio of PET and PEI is 90:10, Example 2 in which the weight ratio is 80:20, and Example 3 in which the weight ratio is 70:30 are more resistant to temperature than Example 5 in which the weight ratio is 60:40. The shrinkage rate was high.

In addition, Example 1 in which the weight ratio of PET and PEI is 90: 10, Example 2 in which the weight ratio is 80: 20, and Example 3 in which the weight ratio is 70: 30 show a higher heat shrinkage than Comparative Example 1 containing PET alone. The temperature was low. Comparative Example 1 had a high shrinkage rate according to temperature, but had a problem in that it was not suitable for a heat-shrinkable film because the heat-shrink onset temperature was excessively high.

Example 6: PET for PET containers/ PEI preparation of mixtures

PET of Preparation Example 1 and PEI of Preparation Example 2 were introduced at a weight ratio of 80:20 to the mixing unit communicating with the input units through the first input unit and the second input unit, respectively. After that, a PET/PEI mixture for a PET container was prepared by stirring at 270° C. for 5 minutes at 100 rpm.

Example 7 to 10 and comparative example 2 to 4

It was prepared in the same manner as in Example 6, but a PET/PEI mixture was prepared by changing the weight ratio, intrinsic viscosity and mixing conditions of PET and PEI as shown in Table 2 below.

Experimental example 2: PET for PET containers/ PEI mixture evaluation

(One) adhesion index measurement

The fusion index was measured for the PET/PEI mixture prepared according to Examples 6 to 11 and Comparative Examples 2 to 4. Specifically, the PET/PEI mixture prepared according to Examples 6 to 10 and Comparative Examples 2 to 4 was crystallized into pellets in a hot air oven at 160 ° C. for 30 minutes, and then put into an aluminum dish and sealed. After that, it was free-falled twice from a height of 80 cm, and the ratio of the weight of the form in which four or more pellets were fused to each other relative to the total weight was measured and expressed as a fusion index. The pellet had a cross-sectional diameter of 0.5 mm and a height of 0.3 mm. This is shown in Table 2 below.

(2) Evaluation of machinability

PET containers were prepared for the PET/PEI mixtures prepared according to Examples 6 to 11 and Comparative Examples 2 to 4, and processability was evaluated and shown in Table 2 below. (○ - Good, △ - Normal, × - bad)

division PET/PEI blend adhesion index machinability weight ratio Intrinsic viscosity (dl/g) PET PEI Example 6 80:20 0.65 0.81 0.60 ○ Example 7 97:3 0.65 0.81 0.59 × Example 8 90:10 0.65 0.81 0.65 ○ Example 9 70:30 0.65 0.81 2.92 ○ Example 10 60:40 0.65 0.81 3.30 ○ Example 11 50:50 0.65 0.81 6.50 ○ Comparative Example 2 50:50 0.69 0.65 6.65 ○ Comparative Example 3 70:30 0.69 0.65 3.13 △

As can be seen from Table 2, Example 6 and Examples 8 to 10, which satisfy the weight ratio and intrinsic viscosity of PET and PEI of the present invention, are PET containers compared to Example 11 and Comparative Examples 2 to 3, which do not satisfy these requirements. showed a suitable fusion index and excellent processability.

Specifically, Example 6, in which the weight ratio of PET and PEI was 80:20, compared to Example 7, in which the weight ratio was 97:3, had no significant difference in fusion index, but had excellent processability.

In addition, Example 6, in which the weight ratio of PET and PEI was 80:20, was significantly superior to Example 11, in which the weight ratio was 50:50.

In addition, Example 11, in which the intrinsic viscosities of PET and PEI were 0.65 dl/g and 0.81 dl/g, respectively, compared to Comparative Example 2, in which the intrinsic viscosities of PET and PEI were 0.69 dl/g and 0.65 dl/g, respectively, the fusion index. was low, and the intrinsic viscosities of PET and PEI were 0.65 dl/g and 0.81 dl/g, respectively, and Example 9 had a lower fusion index and excellent processability compared to Comparative Example 2.

100: automated process 110: first input unit
120: second input unit 130: mixing unit
140: processing step 141: heat shrinkable film
142: heat shrinkable label 143: PET container

Claims (16)

Contains a PET component and a PEI component in a weight ratio of 95: 5 to 55: 45,
The PET component and the PEI component are blended without copolymerization,
The PET component has an intrinsic viscosity of 0.55 to 0.69 dl/g, and the PEI component has an intrinsic viscosity of 0.75 to 0.9 dl/g,
The PET container and the PEI component have a difference in intrinsic viscosity of 0.13 dl / g or more. The PET container according to claim 1, wherein the adhesion index measured by the following measurement method 1 is 0.4 to 3.5.
[Measurement method 1]
The mixture of the PET component and the PEI component was mixed in a ratio of 20:80 based on the total amount of the mixture of 30 g, mixed well, and then placed in an aluminum dish having a diameter of 10 cm. It was crystallized into pellets in a hot air oven at 160 ° C. for 30 minutes, and the degree of fusion was quantitatively evaluated through a free fall test method. First, after sealing the aluminum dish containing the crystallized composition for 30 minutes at 160 ° C, it was free-falled twice from a height of 80 seconds, and after the seal was released, the weight of a lump in which four or more PET pellets were fused together was expressed as a percentage of the total weight And it was expressed as a fusion index. The pellets had a cross-sectional diameter of 0.5 mm and a height of 0.3 mm. delete (1) determining a mixing ratio of PET having an intrinsic viscosity of 0.55 to 0.69 dl/g and PEI having an intrinsic viscosity of 0.75 to 0.9 dl/g according to the application;
(2) preparing a mixture by mixing the PET and PEI according to the determined mixing ratio; and
(3) manufacturing a polyester product by processing the mixture for each purpose;
PET and PEI included in the polyester product are blended without copolymerization, and the PET component and the PEI component have an intrinsic viscosity difference of 0.13 dl / g or more, an automated production method of a polyester product. The method of claim 4, if the use is a heat-shrinkable film,
The mixture is an automated production method for polyester products, characterized in that it comprises PET and PEI in a weight ratio of 95: 5 to 65: 35. The automated production method of a polyester product according to claim 5, wherein the heat-shrinkable film has a shrinkage rate of 8.5 to 20% according to the following relational expression 1 at 60°C.
[Relationship 1]
6. The automated production method of a polyester product according to claim 5, wherein the heat-shrinkable film has a shrinkage rate of 38 to 57% according to the following relational expression 1 at 80°C.
[Relationship 1]
[6] The automated production method of a polyester product according to claim 5, wherein the heat-shrinkable film has a glass transition temperature (Tg) of 64°C to 72°C. The automated production method of a polyester product according to claim 5, wherein the heat-shrinkable film has a shrinkage initiation temperature of 61°C to 65°C. delete The automated production method of a polyester product according to claim 4, wherein the mixture has an intrinsic viscosity of 0.6 to 0.8 dl/g. The method of claim 4, wherein the use is a PET container,
The mixture is an automated production method for polyester products, characterized in that it comprises PET and PEI in a weight ratio of 95: 5 to 55: 45. The automated production method of polyester products according to claim 12, wherein the PET container has a fusion index of 0.4 to 3.5 as measured by the following measuring method 1.
[Measurement method 1]
The mixture of the PET component and the PEI component was mixed in a ratio of 20:80 based on the total amount of the mixture of 30 g, mixed well, and then placed in an aluminum dish having a diameter of 10 cm. It was crystallized into pellets in a hot air oven at 160 ° C. for 30 minutes, and the degree of fusion was quantitatively evaluated through a free fall test method. First, after sealing the aluminum dish containing the crystallized composition for 30 minutes at 160 ° C, it was free-falled twice from a height of 80 seconds, and after the seal was released, the weight of a lump in which four or more PET pellets were fused together was expressed as a percentage of the total weight And it was expressed as a fusion index. The pellets had a cross-sectional diameter of 0.5 mm and a height of 0.3 mm. The automated production method of a polyester product according to claim 4, wherein step (2) is performed at 250 ° C. to 290 ° C. for 5 to 15 minutes at 60 to 140 rpm. A first input unit for injecting a PET component having an intrinsic viscosity of 0.55 to 0.69 dl/g;
A second input unit for injecting a PEI component having an intrinsic viscosity of 0.75 to 0.9 dl/g; and
A mixing unit communicating with the first input unit and the second input unit and mixing the input components;
Adjust the weight ratio by adjusting the amount of the ingredients introduced in the first input unit and the second input unit according to the designated use,
The PET and PEI are blended without copolymerization,
The PET component and the PEI component have an intrinsic viscosity difference of 0.13 dl / g or more, an automated production device for polyester products. The automated production apparatus for polyester products according to claim 15, further comprising a processing unit for processing the mixture mixed in the mixing unit for each purpose.