KR101767987B1 - Method for producing foam using chip of which viscosity is controlled - Google Patents
Method for producing foam using chip of which viscosity is controlled Download PDFInfo
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- KR101767987B1 KR101767987B1 KR1020150185420A KR20150185420A KR101767987B1 KR 101767987 B1 KR101767987 B1 KR 101767987B1 KR 1020150185420 A KR1020150185420 A KR 1020150185420A KR 20150185420 A KR20150185420 A KR 20150185420A KR 101767987 B1 KR101767987 B1 KR 101767987B1
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- thickener
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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
- B29C44/60—Measuring, controlling or regulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B11/00—Making preforms
- B29B11/06—Making preforms by moulding the material
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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
-
- 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
- B29C44/60—Measuring, controlling or regulating
- B29C44/605—Calibration following a shaping operation, e.g. extrusion
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- 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
- B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
The present invention relates to a method for producing a foam using a viscosity-controlled chip, the method comprising: forming a viscosity-controlled chip by mixing a regenerating chip and / or a recycled chip with a thickener to control viscosity; Mixing a viscosity control chip and a virgin chip, and optionally mixing and foaming a thickener to form a foam.
Description
The present invention relates to a method of making foam using a viscosity controlled chip.
BACKGROUND ART [0002] In recent years, eco-friendly foamed molded articles have been actively developed and representative examples of the material include polyester foamed articles. Polyesters are excellent in mechanical properties and excellent in heat resistance and chemical resistance, but they are difficult to mold by melt extrusion and foaming as crystalline resins. On the other hand, with the development of the technology, polyester can also be produced by the foaming process during melt extrusion. For example, U.S. Patent No. 5,000,991 discloses a technique for producing a foamed molded article by extrusion foaming by adding a cross-linking agent to the polyester.
On the other hand, in order to reduce resource recycling and manufacturing costs, attempts have been made to produce foams using wastes such as PET bottles. Among these, recovery chips that use the waste generated during the process and recycle chips that use the waste after the consumer uses the product can be classified. Depending on the application, the viscosity of the polymer varies.
Conventionally, new chips (hereinafter referred to as "virgin chips ") made by polymerization in a recovery and / or recycle chip and a production line are mixed in an extruder and the final composition is maintained at a foaming- , It was necessary to control the viscosity by adding a thickener. However, in this case, it is inconvenient to add the content of the thickener according to the proportion of each of the recycled chips and / or the recycled chips and the virgin chips in the extruder every time, and the yield is low due to low homogeneity and a high percentage of rejects.
It is an object of the present invention to provide a process for producing a foamed foam by using various recycling chips and / or recycled chips, in which the content of the thickener can be made constant in the extruder, or the step of injecting the thickener can be omitted, the homogeneity can be improved, And a method for producing a foam capable of improving the yield.
In order to achieve the above object, a method for producing a foam according to the first embodiment of the present invention comprises the steps of: a) mixing a regenerated chip, a recycled chip or a mixture of chips thereof, and b) Forming a chip; c) a viscosity-controlled chip, and d) mixing and foaming the virgin chips to form a foam.
The foam manufacturing method according to the first embodiment of the present invention can satisfy the following expression.
[Equation 1]
V 1 W 1 + V 2 W 2 + V 3 W 3 = V 4 W 4 + SD 1
&Quot; (2) "
V 4 W 4 + V 5 W 5 = V 7 W 7 SD 2
In the equation,
V 1 is the viscosity of the reproduction chip, V 2 is the viscosity of the recycled chips, V 3 is the viscosity of the thickeners, V 4 is the viscosity of the chip, the viscosity of the control, V 5 is the viscosity of the virgin chip, V 7 is the viscosity of the foam,
W 1 is the weight of the recycled chip, W 2 is the weight of the recycled chip, W 3 is the weight of the thickener, W 4 is the weight of the chip with controlled viscosity, W 5 is the weight of the virgin chip, W 7 is the weight of the foam,
SD 1 is the standard deviation of 3% of the value of V 4 W 4 and SD 2 is the standard deviation of 3% of the value of V 7 W 7 .
A method for producing a foam according to a second embodiment of the present invention comprises the steps of: a) forming a viscosity-controlled chip by mixing a regenerated chip, a recycled chip or a mixture thereof, and b) a first thickener to control viscosity; c) mixing the first thickener with the second thickener, d) the virgin chip, and e) forming the foam by mixing and foaming the second thickener.
The foam manufacturing method according to the second embodiment of the present invention can satisfy the following expression.
[Equation 1]
V 1 W 1 + V 2 W 2 + V 3 W 3 = V 4 W 4 + SD 1
&Quot; (3) "
V 4 W 4 + V 5 W 5 + V 6 W 6 = V 7 W 7 SD 3
In the equation,
V 1 is the reproduction chip viscosity, V 2 is the viscosity of the first thickener is the viscosity, V 3 of the recycled chips, V 4 is the viscosity of the chip, the viscosity of the control, V 5 is the viscosity of the virgin chip, V 6 is the second thickener V 7 is the viscosity of the foam,
W 1 is the reproduction chip weight, W 2 is the recycling chip weight, W 3 is the weight of the first thickener, W 4 is the weight of the chip where the viscosity is controlled, W 5 are by weight of the virgin chip, W 6 are second thickeners W 7 is the weight of the foam,
SD 1 is the standard deviation of 3% of V 4 W 4 and SD 3 is the standard deviation of 3% of V 7 W 7 .
In the present invention, the recycling chip is a chip having a viscosity of 0.55 to 0.65 dl / g made using waste generated during the process, and the recycled chip is a chip having a viscosity of 0.75 to 0.85 dl / g made using waste after use , The virgin chip may be a newly formed viscosity of 0.6 to 0.7 dl / g in the polymerization line in the production line, and the viscosity of the foam may be 1 to 2 dl / g.
In the present invention, a chip having controlled viscosity can be formed by melting a recycled chip, a recycled chip or a mixture of these chips, mixing the thickener, and then molding into a chip form.
In the present invention, the foamed body may be made of polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polylactic acid (PLA), polyglycolic acid (PGA), polyethylene adipate (PEA), polyhydroxyalkanoate , Polytrimethylene terephthalate (PTT), and polyethylene naphthalene (PEN).
According to the present invention, since the foam is produced by using the viscosity control chip in which the viscosity of the viscosity is controlled by melting the regenerating chip and / or the recycled chip and injecting the thickener in accordance with the content, the amount of the thickener can be kept constant in the extruder, The step of injecting the thickener can be omitted. In addition, by controlling the viscosity in advance, the homogeneity can be improved, the defective rate can be lowered, and the yield can be improved.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 schematically shows a method of manufacturing a foam using a viscosity-controlled chip according to a second embodiment of the present invention. FIG.
While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail.
It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
The terms first, second, etc. may be used to describe various elements, but the elements should not be limited by terms. Terms are used only for the purpose of distinguishing one component from another.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.
In the present invention, the terms "comprising" or "having ", and the like, specify that the presence of a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.
Therefore, the configurations shown in the embodiments described herein are merely the most preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents And variations.
Conventionally, a recycle chip / recycle chip and a vir chip were mixed in an extruder and the viscosity was adjusted by adding a thickener. The reason for controlling the viscosity is to improve the foam extrusion molding characteristics, and if the viscosity can not be controlled appropriately, problems may arise such that the expansion ratio is lowered and the appearance becomes poor.
However, in the case of the prior art, there is a problem that the content of the thickener should be added differently according to the proportion of each of the regenerated chip and / or the recycled chip and the virgin chip in the extruder, and the yield is low due to low homogeneity and high defect rate there was.
The present invention is characterized by using a recycled chip and / or a recycled chip which has been previously controlled in viscosity in order to solve the above-mentioned problems of the prior art.
According to the present invention, when a foam is produced using a regenerative chip and / or a recycled chip whose viscosity has been controlled in advance, the amount of the thickener can be kept constant in the extruder or the step of injecting the thickener can be omitted. In addition, by controlling the viscosity in advance, the homogeneity can be improved, the defective rate can be lowered, and the yield can be improved.
[First Embodiment]
The method for producing a foam according to the first embodiment of the present invention comprises the steps of: a) forming a viscosity-controlled chip by mixing a regenerated chip, a recycled chip or a mixture of chips thereof, and b) a thickener to control viscosity; c) a viscosity-controlled chip, and d) mixing and foaming the virgin chips to form a foam.
This embodiment is an embodiment in which a separate thickener is not used when a foam is formed by mixing and foaming a viscosity control chip and a virgin chip. That is, this embodiment forms foams having desired viscosity by adjusting only the mixing ratio of the viscosity control chips and the virgin chips.
First, a viscosity-controlled chip is formed by mixing a regenerating chip, a recycled chip or a mixture of chips thereof, and b) a thickener to control the viscosity.
The reclaimed chips may be 0.55 to 0.65 dl / g of the viscosity of the wastes generated during the process. The recycled chip may be a 0.75 to 0.85 dl / g viscosity made using waste after use by the consumer. In the present invention, the viscosity may be an intrinsic viscosity (IV). The intrinsic viscosity can be measured at 35 DEG C with a Ubbelohde viscometer after dissolving a resin such as PET in a solvent such as phenol / tetrachloroethane (weight ratio 50:50) to prepare a 0.5 wt% solution.
In the present invention, only the recycling chip can be used alone, and only the recycling chip can be used alone, and a recycling chip and a recycling chip can be used in combination. When a recycled chip and a recycled chip are used in combination, the mixing ratio can be appropriately set.
Examples of the recycled chips and / or recycled chips include polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polylactic acid (PLA), polyglycolic acid (PGA), polyethylene adipate (PEA), polyhydroxyalkano (PHA), polytrimethylene terephthalate (PTT), polyethylene naphthalene (PEN) or the like can be used. Regenerated and / or recycled PET chips can be used.
The viscosity control chip may be manufactured by mixing a recycling chip and / or a recycling chip with a thickener. For example, a viscosity-controlled chip can be formed by melting a recycled chip, a recycled chip, or a mixture of chips thereof, mixing the thickener, and then molding into a chip form. The amount of the thickener to be added may be varied depending on the target viscosity of the control chip, the viscosity of the thickener used, the viscosity and amount of the recycled chip and / or the recycled chip, and for example, 100 parts by weight of the recycled chip and / 0.01 to 10 parts by weight.
As the thickening agent, for example, pyromellitic dianhydride (PMDA), trimethylpropanol, glycerin, pentaerythritol, trimellitic anhydride, boronic acid, glycidyl acrylate, glycidyl methacrylate and the like can be used.
The viscosity of the chip whose viscosity is controlled is not particularly limited and can be appropriately set, for example, 0.7 dl / g or more, preferably 1.2 dl / g or more. The upper limit may be, for example, 10 dl / g.
Next, c) a chip whose viscosity is controlled, and d) a virgin chip are mixed and foamed to form a foam.
The virgin chip may be a newly made viscosity polymer of 0.6 to 0.7 dl / g polymerized in the production line.
Examples of the virgin chips include polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polylactic acid (PLA), polyglycolic acid (PGA), polyethylene adipate (PEA), polyhydroxyalkanoate Polytrimethylene terephthalate (PTT), polyethylene naphthalene (PEN) and the like can be used, and a virgin PET chip can be preferably used.
The mixing ratio of the viscosity control chip and the virgin chip may vary depending on the viscosity of the control chip and the viscosity of the foam, for example 10 to 90% by weight of the viscosity control chip and 10 to 90% by weight of the virgin chip, 50 to 90% by weight of a viscosity control chip and 10 to 50% by weight of a virgin chip.
In addition to viscosity control chips and virgin chips, various types of additives can be added as needed. Additives include additives such as nucleating agents, heat stabilizers, foaming agents, flame retardants, surfactants, waterproofing agents, ultraviolet screening agents, hydrophilic agents, cell size extenders, infrared attenuators, plasticizers, fire retardants, pigments, elastic polymers, An anti-static agent and a UV absorber may be used.
Examples of the nucleating agent include talc, mica, silica, diatomaceous earth, alumina, titanium oxide, zinc oxide, magnesium oxide, magnesium hydroxide, aluminum hydroxide, calcium hydroxide, potassium carbonate, calcium carbonate, magnesium carbonate, Inorganic compounds such as glass beads can be used. For example, talc can be used in the present invention. These nucleating agents can serve to impart functionality to the foam, reduce the cost, and the like.
As the thermal stabilizer, organic or inorganic compounds can be used. Organic or inorganic compounds may be, for example, phosphoric acid and its organic esters, phosphorous acid and its organic esters. For example, the heat stabilizer may be a commercially available material, such as phosphoric acid, alkyl phosphate or aryl phosphate. For example, triphenylphosphate may be used as the thermal stabilizer in the present invention, but it is not limited thereto and can be used within a conventional range without limitation as long as it can improve the thermal stability of the foam.
Examples of the foaming agent include gases such as N 2 , CO 2 and Freon and physical blowing agents such as butane, pentane, neopentane, hexane, isohexane, heptane, isoheptane and methyl chloride, azodicarbonamide- Oxybenzene (benzene sulfonyl hydrazide) -based compounds, and N, N'-dinitrosopentamethylene tetraamine-based compounds. For example, CO 2 can be used as a foaming agent in the present invention.
As the flame retardant, for example, a bromine compound, phosphorus or phosphorus compound, antimony compound and metal hydroxide can be used. The bromine compound can be, for example, tetrabromobisphenol A and decabromodiphenyl ether. The phosphorus or phosphorus compounds may be aromatic phosphoric acid esters, aromatic condensed phosphoric acid esters, halogenated phosphoric acid esters, and the like. The antimony compound may be antimony trioxide and antimony pentoxide. The metal element in the metal hydroxide is selected from the group consisting of aluminum (Al), magnesium (Mg), calcium (Ca), nickel (Ni), cobalt (Co), tin (Sn), zinc (Zn) Iron (Fe), titanium (Ti), boron (B), and the like. Of these, aluminum and magnesium are preferable. The metal hydroxide may be composed of one kind of metal element or two or more kinds of metal elements. For example, examples of the metal hydroxide composed of one kind of metal element include aluminum hydroxide and magnesium hydroxide.
Examples of the surfactant include anionic surface active agents (e.g., fatty acid salts, alkylsulfuric acid ester salts, alkylbenzenesulfonic acid salts, alkylnaphthalenesulfonic acid salts, alkylsulfosuccinic acid salts, polyoxyethylene alkylsulfuric acid ester salts and the like) (For example, polyoxyalkylene alkyl ethers such as polyoxyethylene alkyl ethers, polyoxyethylene derivatives, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbitol fatty acid esters, glycerin fatty acid esters, poly (For example, alkylamine salts, quaternary ammonium salts, alkyl betaines, amine oxides, etc.) and water-soluble polymers or protective colloids (for example, polyoxyethylene alkylamines, For example, gelatin, methylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, carboxymethylcellulose, And the like can be used polyoxypropylene block copolymer, polyacrylamide, polyacrylic acid, polyacrylate, sodium alginate, polyvinyl alcohol partial saponified product, and so on) - diplopia methyl cellulose, polyethylene glycol, a polyoxyethylene.
Examples of the waterproofing agent include silicone, epoxy, cyanoacrylic acid, polyvinyl acrylate, ethylene vinyl acetate, acrylate, polychloroprene, polyurethane resin and polyester resin, polyol and poly A mixture of acrylic resin and polyurethane resin, a mixture of acrylic resin and polyurethane resin, a polyimide resin, and a mixture of cyanoacrylate and urethane resin.
As the ultraviolet screening agent, for example, an organic or inorganic ultraviolet screening agent may be used. Examples of the organic ultraviolet screening agent include p-aminobenzoic acid derivatives, benzylidene campo derivatives, cinnamic acid derivatives, benzophenone derivatives, benzotriazole derivatives, and mixtures thereof. As the inorganic ultraviolet screening agent, titanium dioxide, zinc oxide, manganese oxide, zirconium dioxide, cerium dioxide and mixtures thereof can be used.
As the foaming method, extrusion foaming can be used. Extrusion foaming is a method in which the resin is heated and melted, and the resin melt is continuously extruded and foamed. Extrusion foaming can simplify the process steps, enable mass production, and prevent cracks and grain breakage between the beads during bead foaming, thereby realizing more excellent bending strength and compressive strength. Extrusion can be carried out using an extruder. As the extruder, a single extruder, a twin extruder, a tandem extruder, or the like can be used. The viscosity of the foam may be between 1 and 2 dl / g.
The foam manufacturing method according to the first embodiment of the present invention can satisfy the following expression.
[Equation 1]
V 1 W 1 + V 2 W 2 + V 3 W 3 = V 4 W 4 + SD 1
&Quot; (2) "
V 4 W 4 + V 5 W 5 = V 7 W 7 SD 2
In the equation,
V 1 is the viscosity of the reproduction chip, V 2 is the viscosity of the recycled chips, V 3 is the viscosity of the thickeners, V 4 is the viscosity of the chip, the viscosity of the control, V 5 is the viscosity of the virgin chip, V 7 is the viscosity of the foam, The unit may be, for example, dl / g.
W 1 is the weight of the recycled chip, W 2 is the weight of the recycled chip, W 3 is the weight of the thickener, W 4 is the weight of the chip with controlled viscosity, W 5 is the weight of the virgin chip, W 7 is the weight of the foam, The unit may be, for example, mg, g, kg or ton. W 1 or W 2 may be zero. W 4 may be the sum of W 1 + W 2 + W 3 , or may be within 3% of the sum. W 7 may be the sum of W 4 + W 5 , or may be within 3% of the total value.
SD 1 is the standard deviation of 3% of the value of V 4 W 4 , SD 2 is the standard deviation of 3% of the value of V 7 W 7 .
For example, a viscosity-controlled regenerated chip having a viscosity of about 1.5 dl / g was prepared by adding a thickener to a regenerated chip having a viscosity of about 0.6 dl / g,
By mixing and foaming about 64.7 kg of a regenerated chip having a viscosity of about 1.5 dl / g and about 35.3 kg of a virgin chip having a viscosity of about 0.65 dl / g,
About 100 kg of a foam having a viscosity of about 1.2 dl / g can be produced.
[Second Embodiment]
A method for producing a foam according to a second embodiment of the present invention comprises the steps of: a) forming a viscosity-controlled chip by mixing a regenerated chip, a recycled chip or a mixture thereof, and b) a first thickener to control viscosity; c) mixing the first thickener with the second thickener, d) the virgin chip, and e) forming the foam by mixing and foaming the second thickener.
This embodiment differs from the first embodiment in that a separate thickener (second thickener) is used when a foam is formed by mixing and foaming a viscosity control chip and a virgin chip. That is, this embodiment forms a foam having a desired viscosity by controlling the mixing ratio of the viscosity control chip, the virgin chip and the second thickener. In this embodiment, although a separate thickener (second thickener) is used, an advantage that the amount of the thickener is kept constant in the extruder can be obtained by using a chip whose viscosity is controlled in advance.
The second thickener is the same as the first embodiment except for the use of the second thickener, so a detailed description thereof will be omitted. The second thickener may be the same as or different from the first thickener. The amount of the second thickener to be added may be varied depending on the viscosity of the target foam, the viscosity of the thickener to be used, the viscosity and amount of the viscosity control chip, the viscosity and amount of the virgin chip, etc. For example, May be 0.01 to 10 parts by weight based on 100 parts by weight.
The foam manufacturing method according to the second embodiment of the present invention can satisfy the following expression.
[Equation 1]
V 1 W 1 + V 2 W 2 + V 3 W 3 = V 4 W 4 + SD 1
&Quot; (3) "
V 4 W 4 + V 5 W 5 + V 6 W 6 = V 7 W 7 SD 3
In the equation,
V 1 is the reproduction chip viscosity, V 2 is the viscosity of the first thickener is the viscosity, V 3 of the recycled chips, V 4 is the viscosity of the chip, the viscosity of the control, V 5 is the viscosity of the virgin chip, V 6 is the second thickener V 7 is the viscosity of the foam, and the unit may be, for example, dl / g.
W 1 is the reproduction chip weight, W 2 is the recycling chip weight, W 3 is the weight of the first thickener, W 4 is the weight of the chip where the viscosity is controlled, W 5 are by weight of the virgin chip, W 6 are second thickeners W 7 is the weight of the foam, and the unit may be, for example, mg, g, kg or ton. W 1 or W 2 may be zero. W 4 may be the sum of W 1 + W 2 + W 3 , or may be within 3% of the sum. W 7 may be the sum of W 4 + W 5 + W 6 , or may be within 3% of the total value.
SD 1 is the standard deviation of 3% of the value of V 4 W 4 , and SD 3 is the standard deviation of 3% of the value of V 7 W 7 .
FIG. 1 schematically shows a method of manufacturing a foam using a viscosity-controlled chip according to a second embodiment of the present invention, in which both the regenerating chip and the recycled chip are used and both the first thickener and the second thickener are used. When the second thickener is not used in the extruder, this is the first embodiment.
Claims (7)
c) a viscosity-controlled chip, and d) mixing and foaming the virgin chips to form a foam,
The regenerated chips are chips having a viscosity of 0.55 to 0.65 dl / g made by using waste generated during the process,
The recycled chip has a viscosity of 0.75 to 0.85 dl / g made by using the waste after the use of the consumer,
The virgin chip is a newly formed viscosity polymer of 0.6 to 0.7 dl / g which is polymerized in the production line,
The viscosity of the foam is 1 to 2 dl / g,
A foam manufacturing method characterized by satisfying the following formula:
[Equation 1]
V 1 W 1 + V 2 W 2 + V 3 W 3 = V 4 W 4 + SD 1
&Quot; (2) "
V 4 W 4 + V 5 W 5 = V 7 W 7 SD 2
In the equation,
V 1 is the viscosity of the reproduction chip, V 2 is the viscosity of the recycled chips, V 3 is the viscosity of the thickeners, V 4 is the viscosity of the chip, the viscosity of the control, V 5 is the viscosity of the virgin chip, V 7 is the viscosity of the foam,
W 1 is the weight of the recycled chip, W 2 is the weight of the recycled chip, W 3 is the weight of the thickener, W 4 is the weight of the chip with controlled viscosity, W 5 is the weight of the virgin chip, W 7 is the weight of the foam,
SD 1 is the standard deviation of 3% of the value of V 4 W 4 and SD 2 is the standard deviation of 3% of the value of V 7 W 7 .
c) blending and foaming a viscosity controlled chip, d) a virgin chip, and e) a second thickener to form a foam,
The regenerated chips are chips having a viscosity of 0.55 to 0.65 dl / g made by using waste generated during the process,
The recycled chip has a viscosity of 0.75 to 0.85 dl / g made by using the waste after the use of the consumer,
The virgin chip is a newly formed viscosity polymer of 0.6 to 0.7 dl / g which is polymerized in the production line,
The viscosity of the foam is 1 to 2 dl / g,
A foam manufacturing method characterized by satisfying the following formula:
[Equation 1]
V 1 W 1 + V 2 W 2 + V 3 W 3 = V 4 W 4 + SD 1
&Quot; (3) "
V 4 W 4 + V 5 W 5 + V 6 W 6 = V 7 W 7 SD 3
In the equation,
V 1 is the reproduction chip viscosity, V 2 is the viscosity of the first thickener is the viscosity, V 3 of the recycled chips, V 4 is the viscosity of the chip, the viscosity of the control, V 5 is the viscosity of the virgin chip, V 6 is the second thickener V 7 is the viscosity of the foam,
W 1 is the reproduction chip weight, W 2 is the recycling chip weight, W 3 is the weight of the first thickener, W 4 is the weight of the chip where the viscosity is controlled, W 5 are by weight of the virgin chip, W 6 are second thickeners W 7 is the weight of the foam,
SD 1 is the standard deviation of 3% of V 4 W 4 and SD 3 is the standard deviation of 3% of V 7 W 7 .
Characterized in that a viscosity controlled chip is formed by melting a recycled chip, a recycled chip or a mixture of these chips, mixing the thickener, and molding the mixture into a chip form.
The foamed body may be made of at least one selected from the group consisting of polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polylactic acid (PLA), polyglycolic acid (PGA), polyethylene adipate (PEA), polyhydroxyalkanoate (PTT), and polyethylene naphthalene (PEN). ≪ RTI ID = 0.0 > 11. < / RTI >
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0960711A2 (en) | 1994-10-21 | 1999-12-01 | E. Khashoggi Industries | Foamed starch compositions, articles and methods |
| JP2003165861A (en) * | 2001-11-29 | 2003-06-10 | Aron Kasei Co Ltd | Method for producing expanded polyester resin molded product |
-
2015
- 2015-12-23 KR KR1020150185420A patent/KR101767987B1/en active IP Right Grant
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0960711A2 (en) | 1994-10-21 | 1999-12-01 | E. Khashoggi Industries | Foamed starch compositions, articles and methods |
| JP2003165861A (en) * | 2001-11-29 | 2003-06-10 | Aron Kasei Co Ltd | Method for producing expanded polyester resin molded product |
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| KR20170075914A (en) | 2017-07-04 |
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