KR20170029230A - A method for producing kinds of tray and containers using non-crosslinked pp foamed sheet mixed with high melt strength pp resin - Google Patents

A method for producing kinds of tray and containers using non-crosslinked pp foamed sheet mixed with high melt strength pp resin Download PDF

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Publication number
KR20170029230A
KR20170029230A KR1020150126281A KR20150126281A KR20170029230A KR 20170029230 A KR20170029230 A KR 20170029230A KR 1020150126281 A KR1020150126281 A KR 1020150126281A KR 20150126281 A KR20150126281 A KR 20150126281A KR 20170029230 A KR20170029230 A KR 20170029230A
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South Korea
Prior art keywords
resin
high melt
melt tension
polypropylene
producing
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KR1020150126281A
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Korean (ko)
Inventor
백양수
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한우아이엘(주)
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Priority to KR1020150126281A priority Critical patent/KR20170029230A/en
Publication of KR20170029230A publication Critical patent/KR20170029230A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/3442—Mixing, kneading or conveying the foamable material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/3442—Mixing, kneading or conveying the foamable material
    • B29C44/3446—Feeding the blowing agent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/3442—Mixing, kneading or conveying the foamable material
    • B29C44/3446—Feeding the blowing agent
    • B29C44/3449—Feeding the blowing agent through the screw
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/60—Measuring, controlling or regulating
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/14—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
    • C08J9/141—Hydrocarbons
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/12—Polypropene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene

Abstract

The present invention relates to a method for producing a non-crosslinked polypropylene foamed sheet having high melt tension which, to eliminate foaming difficulties due to the low viscosity and low melt tension of polypropylene during melting, utilizes a resin having high melt tension, and through a sheet having uniform and fine cells, increases the foaming ratio by a factor of 1.1-5. According to the present invention, the method for producing a non-crosslinked polypropylene foamed sheet having high melt tension, and a sheet produced thereby show excellent impact properties, excellent moisture barrier properties, heat resistance, moldability, and secondary processability at low temperature, show a low degree of container deformation at high temperature, and provide excellent productivity and cost-effectiveness. Also, the present invention may replace EPS, is environmentally-friendly, and may be used to produce microwavable containers, regular food containers, cup noodle containers which are exposed to high temperature and the like.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of manufacturing a non-crosslinked PP foamed SHEET using a high-melt tension POLYPROPYLENE RESIN and a method of manufacturing a container using the same,

The present invention relates to a method for producing a polypropylene foam sheet having a high melt tension and, more particularly, to a polypropylene resin composition having a high melt tension to solve the problem of difficulty in foaming due to low viscosity of polypropylene and low melt tension To a method for producing a high melt strength uncrosslinked polypropylene foam sheet in which the expansion ratio is increased to 1.1 to 5 times through a sheet having uniform and fine cells.

As is well known, conventionally, the foamed molded article of a synthetic resin was produced by using a polyethylene resin, a polypropylene resin or a polystyrene resin as a main material. An expanded molded article produced by using a polyethylene resin or a polystyrene resin, And the like. Therefore, the foamed molded article produced using the renewable polypropylene type resin is widely used, while the demand thereof is decreasing.

On the other hand, the polypropylene-based expanded molded articles are classified into a crosslinked type and a non-crosslinked type.

The crosslinked polypropylene-based expanded molded article can be obtained, for example, from a polypropylene type resin such as a propylene homopolymer, an ethylene-propylene random copolymer, an ethylene-propylene block copolymer, an ethylene-propylene-butene random copolymer, a propylene- Or a mixture of two or more thereof) with a blowing agent (e.g., air, etc.) is mixed with, stirred and melted to prepare a primary molded article in the form of a plate or rod, Dicapryl phthalate (DCP), so that the DCP is impregnated on the surface of the molded body and exposed to water vapor for about 10 hours to allow the DCP to be impregnated into the inside of the molded body, Followed by secondary molding.

The polypropylene foam molded article produced by this method causes problems such as destruction of the ozone layer due to the use of a volatile substance such as chlorofluorocarbons (including CFCs and HCFCs) as a blowing agent. In the second molding, steam is used And it is necessary to ignite for 10 hours or more. Further, at the time of crosslinking foaming, the appearance of the foam may be poor due to under-crosslinking, premature oxidation of the resin, premature crosslinking and early foaming, extrusion torque and resin pressure rise and the like.

In recent years, unfolded polypropylene expanded molded articles have been spotlighted due to the following characteristics: excellent heat resistance and dimensional stability; High buffering and energy absorbing effects; Adequate strength, flexibility and elasticity; Reproducibility; Excellent oil resistance and chemical resistance; Non-toxic; Low permeability and thermal conductivity; Excellent processability and so on.

That is, since the unsheathed polypropylene foamed molded article has excellent workability and heat resistance, it is advantageous to manufacture it as a polypropylene food container very suitable for microwave oven.

This unfolded polypropylene expanded molded article can be used for microwave ovens due to the high melting temperature of polypropylene compared to other materials, but it is environmentally friendly compared to EPS, which is already used material, Therefore, it is possible to replace the conventional EPS container.

However, the polypropylene expanded molded article of the present invention is likely to open when the water content is mixed with the resin or when the extrusion load is excessively high, or when the resin density is high, the aging time may be delayed, Especially, it is difficult to control the expansion ratio. Furthermore, since it is necessary not only to smoothly maintain the flow (flow) of the resin but also to have a viscosity enough to hold a normal bubble structure, it is very difficult to set the optimum operating conditions and conditions.

In addition, polypropylene has a problem that the viscosity is low as compared with the excellent physical properties of the material, and foaming is not easy due to a low melt tension.

SUMMARY OF THE INVENTION The present invention has been made in view of the circumstances of the prior art described above, and has an object of providing a method of manufacturing a polypropylene resin sheet, which uses a resin having a high melt tension so as to solve problems of low foaming due to low viscosity and low melt tension at the time of melting, The present invention provides a method for producing a polypropylene foam sheet having a high melt tension, wherein the expansion ratio is increased to 1.1 to 5 times through a sheet having a high melt tension.

According to a preferred embodiment of the present invention, there is provided a method for producing a non-crosslinked polypropylene foam sheet, comprising the steps of: (a) mixing 30 parts by weight to 58.5 parts by weight of a high melt strength (HMS) And 30 to 66.50 parts by weight of a conventional polypropylene resin are mixed with a screw of a tandem extruder to melt the mixture at a temperature of 180 to 250 캜; (b) changing the temperature of the molten mixture from 170 ° C to 230 ° C to 180 ° C until the foaming agent is added; (c) holding the pressure inside the extruder cylinder at 20 to 30 kg / cm < 2 >, then adding 3 to 10 parts by weight of butane gas and CO 2 gas blowing agent; And (d) a high melt strength (HMS) polypropylene resin and a mixture of conventional polypropylene resin and butane gas blowing agent are mixed well and the temperature is changed from 180 ° C. to 150 ° C. And changing the pressure from 90 kg / cm < 2 > to 120 kg / cm < 2 >.

Preferably, the High Melt Strength (HMS) polypropylene resin has a MFR (melt index) of 1 to 8 g / min and a MT (melt tension) of 4 to 23 g. A method for producing a polypropylene foam sheet is provided.

Preferably, the conventional polypropylene resin has a MFR (melt index) of 2 to 5 g / min and a MT (melt tension) of 2 to 10 g. / RTI >

The process for producing the uncrosslinked polypropylene foam sheet according to the present invention and the sheet thus produced have excellent impact properties at low temperatures, excellent moisture barrier properties, heat resistance, moldability and secondary processability, It is very suitable as a container for microwave oven, general food container, and cup noodle container which is a high temperature environment because it is very low in deformation of container, high in productivity, high in economic efficiency, and can be substituted for EPS.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a process diagram showing a process for producing a high melt strength, uncrosslinked polypropylene foam sheet according to an embodiment of the present invention. FIG.

Hereinafter, the present invention will be described in detail with reference to the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a process diagram showing a process for producing a high melt strength, uncrosslinked polypropylene foam sheet according to an embodiment of the present invention. FIG.

The method for producing a polypropylene foam sheet having a high melt tension according to an embodiment of the present invention is characterized in that the polypropylene has a low melt viscosity and a low melt tension, The present invention provides a method for producing a high molecular weight, non-crosslinked polypropylene foam sheet in which the high resin is used to increase the expansion ratio from 1.1 to 5 times through a sheet having uniform and fine cells.

In the method for producing the uncrosslinked polypropylene foam sheet of the present invention, the polypropylene resin as the main material is preferably HMS polypropylene resin and conventional polypropylene resin.

The temperature of the molten mixture of the HMS polypropylene resin and the conventional polypropylene resin is changed from 170 ° C. to 230 ° C. to 180 ° C. until the foaming agent is added in order to impart the optimum condition for introducing the foaming agent The temperature change from 230 DEG C to 180 DEG C is achieved by causing the polypropylene molten mixture to pass through the cooling section of eight stages.

In the process for producing the uncrosslinked polypropylene foam sheet of the present invention, the polypropylene resin as the main material has a melt tension (MT) value of 4 to 25 g, a melt flow rate (MFR) of 5 to 10 g / Is preferable, and it is preferable that the resin is produced such that the foaming ratio reaches 1.1 to 5 times.

Non-volatile substances such as azodicarbonamide and stearyl monoglyceride, and inorganic gas-based substances such as nitrogen, carbon dioxide, argon, air and the like may be used as a foaming agent (normally air is used) It is preferable to use butane gas or CO2 gas as a foaming agent. If the amount of the foaming agent is too large, the foaming cell may open, and since it is also limited to dissolve in the resin, the amount of the blowing agent should be set within the range of 3 to 10 parts by weight, depending on the expansion ratio.

In order to maintain the flow of the resin smoothly and to have a viscosity sufficient to hold a normal bubble structure (i.e., to ensure that the mixture of polypropylene resin and butane gas blowing agent is well mixed and transferred smoothly to the die , The temperature is preferably changed from 180 DEG C to 150 DEG C and the pressure is changed from 90 kg / cm < 2 > to 120 kg / cm < 2 >. At this time, the temperature change from 180 DEG C to 150 DEG C is achieved by allowing the mixture of the polypropylene resin and the butane gas blowing agent to pass through the cooling section of 15 stages.

The high melt tension, uncrosslinked polypropylene foam sheet produced by the present invention has excellent heat resistance, is excellent in moldability and secondary processability, has a small sheet stiffness and excellent heat resistance during molding, and can be used as a food container such as a microwave oven It is suitable for use.

The following examples further illustrate the present invention. However, the following examples are intended to illustrate the present invention, and the scope of the present invention should not be construed as being limited to the following examples. Accordingly, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims, It will be understood that modifications and adaptations are possible.

Example

35 parts by weight of High Melt Strength (HMS) polypropylene resin and 65 parts by weight of conventional polypropylene resin were mixed and melted at a temperature of 180 to 250 DEG C while being transferred to a screw of a tandem extruder.

Subsequently, the temperature of the molten mixture was changed from 170 ° C to 230 ° C to 180 ° C until the foaming agent was added, thereby setting an optimum condition for the introduction of the foaming agent. On the other hand, the temperature change from 230 DEG C to 180 DEG C was achieved by allowing the molten mixture to pass through the cooling section of eight steps. Subsequently, the pressure inside the extruder cylinder was maintained at 20 to 30 kg / cm 2, and then 3 parts by weight of butane gas and CO 2 blowing agent were added.

Subsequently, the temperature was changed from 180 DEG C to 150 DEG C and the pressure was changed from 90 kg / cm < 2 > to 120 kg / cm < 2 > so that the polypropylene resin and butane gas blowing agent were mixed well and smoothly transferred to the die. On the other hand, the temperature change from 180 DEG C to 150 DEG C was achieved by allowing a mixture of polypropylene resin and butane gas blowing agent to pass through the cooling section of 15 steps. Thereafter, a polishing process, a cutting process, and a packaging process, which are well known in the art, were performed in sequence.

Hereinafter, test results of the conditioner of the molded container will be examined through Tables 1 to 4.

(Moldability) PP foaming (manufactured by the present invention) PP non-foaming Advantages Stroke / minute 30 25 5 Processing temperature 360 ° C 400 ° C Energy cost saving effect Punching force 70% 100% 30% Reduced maintenance cost weight 12.12 15.57 22% weight reduction, ease of handling Production / hour 14.400 12,000 20% or more

8 cavity mold, magnification × 1.3 times

Referring to Table 1, the high melt tension, uncrosslinked polypropylene foam sheet produced by the present invention is more effective in reducing the power ratio and maintenance cost than the other polypropylene non-foamed sheet, , And the production yield is 20% higher.

(Processability evaluation) Resin used Secondary processability combination
A / B MFR
(g / 10 min) Melt tension (g) Extrudability Foaming magnification (times) Seat appearance Sheet deflection Formability evaluation Example 35/65 6 4 ◎ × 3 times ◎ ○ ◎ ○

A: HMS PP

B: conventional PP

Sheet specification: 1.0 mm, magnification: x 3 times

Referring to Table 2, the high melt tension, uncrosslinked polypropylene foam sheet produced by the present invention exhibited excellent test results in terms of extrudability, expansion ratio, sheet deflection, formability, and the like.

(Evaluation table of heat resistance by container) By Container Type Container thickness Expansion ratio Container temperature Container temperature after hot water injection touch Mm 1 minute After 3 minutes PP foam container (single layer) 1.3 About three times 20 ℃ 69 ℃ 65 ℃ Has a little PP foam container (multi-layer) 0.95 About 2.1 times 19 ℃ 73 ℃ 70 ℃ Has a little PP bubble container 1.6 About 4 times 20 ℃ 67 ° C 55 ° C No heat PP Cup 2 - 21 ℃ 61 ℃ 63 ° C Has heat PE container 2 - 22 ℃ 67 ° C 69 ℃ Has heat Paper cup 0.25 - 19 ℃ 82 ° C 75 ℃ Has heat

Referring to Table 3, it can be seen that the polypropylene foam sheet of high melt tension produced by the present invention has excellent heat resistance and is very suitable for microwave oven containers.

(Container deformation test when driving microwave oven) Test purpose Change of container by hour Boiling water 95 ℃ 2 minutes 5 minutes 7 minutes 10 minutes No change No change No change No change

MAKER: DAEWOO ELECTRONICS

MODEL: KOC-8H9T

Sheet: 1.0 mmM, magnification: 3 times

Referring to Table 4, even when the polypropylene foam sheet having a high melt tension and produced by the present invention is put in a microwave oven and the internal water is heated until it is heated, deformation of the container is not generated. It can be seen that it is suitable.

Meanwhile, the method for producing a non-crosslinked polypropylene foam sheet having a high melt tension according to an embodiment of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the technical gist of the present invention.

Claims (3)

A method for producing a non-crosslinked polypropylene foam sheet,
(a) 30 parts by weight to 58.5 parts by weight of high melt strength (HMS) polypropylene resin and 30 parts by weight to 66.50 parts by weight of conventional polypropylene resin were mixed and transferred to a screw of a tandem extruder Melting the mixture at a temperature of 180 to 250 캜;
(b) changing the temperature of the molten mixture from 170 ° C to 230 ° C to 180 ° C until the foaming agent is added;
(c) holding the pressure inside the extruder cylinder at 20 to 30 kg / cm < 2 >, then adding 3 to 10 parts by weight of butane gas and CO 2 gas blowing agent; And
(d) High Melt Strength (HMS) The temperature is changed from 180 ° C. to 150 ° C. so that the mixture of the polypropylene resin and the conventional polypropylene resin and butane gas blowing agent is well mixed and transferred smoothly to the die , And a step of changing the pressure from 90 kg / cm 2 to 120 kg / cm 2. The method according to claim 1,
Wherein the high melt strength (HMS) polypropylene resin has a MFR (melt index) of 1 to 8 g / min and a MT (melt tension) of 4 to 23 g. A method for producing a propylene foam sheet. The method according to claim 1,
Wherein said conventional polypropylene resin has a MFR (melt index) of 2 to 5 g / min and an MT (melt tension) of 2 to 10 g.
KR1020150126281A 2015-09-07 2015-09-07 A method for producing kinds of tray and containers using non-crosslinked pp foamed sheet mixed with high melt strength pp resin KR20170029230A (en)

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KR1020150126281A KR20170029230A (en) 2015-09-07 2015-09-07 A method for producing kinds of tray and containers using non-crosslinked pp foamed sheet mixed with high melt strength pp resin

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180135200A (en) * 2017-06-12 2018-12-20 (주)엘지하우시스 Non crosslinked olefin resin composition and foam and method for manufacturing the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180135200A (en) * 2017-06-12 2018-12-20 (주)엘지하우시스 Non crosslinked olefin resin composition and foam and method for manufacturing the same

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