WO2012008784A2 - 발포성 전분 비드 및 이의 제조방법 - Google Patents
발포성 전분 비드 및 이의 제조방법 Download PDFInfo
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- WO2012008784A2 WO2012008784A2 PCT/KR2011/005205 KR2011005205W WO2012008784A2 WO 2012008784 A2 WO2012008784 A2 WO 2012008784A2 KR 2011005205 W KR2011005205 W KR 2011005205W WO 2012008784 A2 WO2012008784 A2 WO 2012008784A2
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- 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
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- 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
- C08J9/16—Making expandable particles
- C08J9/18—Making expandable particles by impregnating polymer particles with the blowing agent
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- 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
- C08J9/22—After-treatment of expandable particles; Forming foamed products
- C08J9/228—Forming foamed products
- C08J9/232—Forming foamed products by sintering expandable particles
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L3/00—Compositions of starch, amylose or amylopectin or of their derivatives or degradation products
- C08L3/02—Starch; Degradation products thereof, e.g. dextrin
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- 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
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/06—CO2, N2 or noble gases
-
- 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
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/14—Saturated hydrocarbons, e.g. butane; Unspecified hydrocarbons
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- 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
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/14—Saturated hydrocarbons, e.g. butane; Unspecified hydrocarbons
- C08J2203/142—Halogenated saturated hydrocarbons, e.g. H3C-CF3
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- 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
- C08J2351/00—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
- C08J2351/02—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers grafted on to polysaccharides
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- 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
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
Definitions
- the present invention relates to a foamed starch bead and a method for preparing the same, more particularly, a foamed starch bead comprising a starch-monomer copolymer formed by binding a specific monomer to starch and a volatile blowing agent impregnated in the starch-monomer copolymer; It relates to a manufacturing method thereof.
- Styrofoam prepared by foaming expanded polystyrene beads is widely used as a material for disposable products, but if discarded in the natural environment after use, it remains semi-permanent without being decomposed and is a main cause of environmental pollution. Therefore, researches on biodegradable materials that replace styrofoam are being actively conducted, but materials that can completely replace styrofoam have not been developed.
- Starch is mainly used as a main material of biodegradable material that can replace styrofoam.
- US Patent No. 4,863,655 discloses a method of manufacturing a biodegradable buffer material by supplying water to an extruder with foamed starch or modified starch and a blowing agent. Is disclosed. However, when foaming using an extruder, it is difficult to produce foams with various shapes and sizes, and mainly peanut-shaped foams are produced. In addition, in the case of a foam mainly containing starch as a main material, there is a limit to replace styrofoam in physical properties.
- the present invention is derived to solve the conventional problems, one object of the present invention is the main raw material is environmentally friendly starch, and can be molded into a foam having a specific shape in a variety of molds, such as expandable polystyrene beads To provide effervescent starch beads.
- Another object of the present invention to provide a method for producing the expandable starch bead.
- the present invention comprises a starch-monomer copolymer and a blowing agent impregnated in the starch-monomer copolymer
- the starch-monomer copolymer is styrene, ⁇ -methylstyrene, lactide , Lactic acid, acrylic acid, methacrylic acid, acrylic acid ester, methacrylic acid ester, acrylonitrile, acrylamide, and at least one monomer selected from the group consisting of caprolactone is formed by bonding to starch
- the blowing agent is C 2 It provides an expandable starch bead characterized by consisting of at least one member selected from the group consisting of aliphatic hydrocarbon of ⁇ C 7 , C 2 ⁇ C 7 halogenated hydrocarbon, and carbon dioxide.
- the present invention comprises a fine pellet formed by extruding a mixture of a starch-monomer copolymer and a resin and a blowing agent impregnated in the fine pellet
- the starch-monomer copolymer is styrene, ⁇ -methylstyrene, lactide, Lactic acid, acrylic acid, methacrylic acid, acrylic ester, methacrylic acid ester, acrylonitrile, acrylamide
- the resin is polystyrene, polyethylene , Polypropylene, ethylene vinyl acetate, polylactic acid, polycaprolactone, polybutylene succinate, polybutylene succinate adipate and polybutylene adipate terephthalate
- at least one member selected from the group consisting of the blowing agent is a halogenated hydrocarbon, carbon dioxide and a C 2 ⁇ C 7 alipha
- the present invention comprises the steps of preparing a starch-monomer copolymer; And impregnating a blowing agent in the prepared starch-monomer copolymer, wherein the starch-monomer copolymer comprises styrene, ⁇ -methylstyrene, lactide, lactic acid, acrylic acid, methacrylic acid, acrylic acid ester, methacrylic At least one monomer selected from the group consisting of acid esters, acrylonitrile, acrylamide and caprolactone is formed by bonding to starch, and the blowing agent is C 2 to C 7 aliphatic hydrocarbon, C 2 to C 7 halogenated hydrocarbon It provides a method for producing expandable starch beads, characterized in that composed of at least one selected from the group consisting of, and carbon dioxide.
- the present invention comprises the steps of preparing a fine pellet by mixing and extruding the starch-monomer copolymer and resin; And containing a blowing agent in the prepared fine pellets, wherein the starch-monomer copolymer comprises styrene, ⁇ -methylstyrene, lactide, lactic acid, acrylic acid, methacrylic acid, acrylic acid ester, methacrylic acid ester , At least one monomer selected from the group consisting of acrylonitrile, acrylamide and caprolactone is formed by bonding to starch, and the resin is polystyrene, polyethylene, polypropylene, ethylene vinyl acetate, polylactic acid, polycaprolactone, It is composed of one or more selected from the group consisting of polybutylene succinate, polybutylene succinate adipate and polybutylene adipate terephthalate, the blowing agent C 2 ⁇ C 7 aliphatic hydrocarbon, C 2 ⁇ C that
- the expandable starch beads according to the present invention have similar properties to the expandable polystyrene beads and can be foamed by the foaming equipment of the expandable polystyrene beads.
- foams having various sizes and various shapes may be manufactured by a mold.
- foam molding using a foaming apparatus including an extruder the size and shape of the foam is limited by the die provided in front of the extruder, and typically, only foam in the form of a rump or sheet can be produced. Therefore, the foam produced from the expandable starch beads of the present invention has the advantage that it can be used in a variety of forms, such as styrofoam and small and medium packaging as well as small packaging.
- the foams produced from the effervescent starch beads of the present invention have an environmentally friendly advantage of being degraded by microorganisms in the soil when disposed.
- Figure 2 is a photograph showing the fine granules produced by the extruder in Preparation Example 10.
- Figure 4 is a photograph showing a foam in the form of a plate prepared in Test Example 1.
- FIG. 5 is a photograph showing a foam in the form of a rectangular box container prepared in Test Example 10.
- Figure 6 is a photograph showing a peanut-shaped foam prepared in Comparative Test Example 2.
- Figure 7 is a photograph showing a foam in the form of a plate prepared in Comparative Test Example 4.
- Effervescent starch beads according to an embodiment of the present invention includes a starch-monomer copolymer and a blowing agent impregnated in the starch-monomer copolymer.
- the starch-monomer copolymer is selected from the group consisting of styrene, ⁇ -methylstyrene, lactide, lactic acid, acrylic acid, methacrylic acid, acrylic ester, methacrylic acid ester, acrylonitrile, acrylamide and caprolactone It is a graft copolymer formed by bond
- the acrylic ester is preferably an ester of acrylic acid and an alcohol having 1 to 8 carbon atoms, for example, methyl acrylate, ethyl acrylate, butyl acrylate and the like.
- the methacrylic acid ester is preferably an ester of methacrylic acid and an alcohol having 1 to 8 carbon atoms, for example, methyl methacrylate, ethyl methacrylate, butyl methacrylate and the like.
- the starch constituting the starch-monomer copolymer may be composed of one or more selected from the group consisting of corn starch, waxy corn starch, tapioca starch, potato starch, sweet potato starch, wheat starch, rice starch and modified starches thereof. It is not limited to this.
- the modified starch may be selected from the group consisting of oxidized starch, acid treated starch, ester starch, ether starch, phosphate crosslinked starch and acetyladipic acid starch.
- the weight ratio of starch to monomer constituting the starch-monomer copolymer is not particularly limited, and preferably has a range of 10:90 to 90:10.
- the blowing agent is a volatile low boiling point, can be composed of at least one element selected from the group consisting of halogenated hydrocarbons, and carbon dioxide C 2 ⁇ C 7 aliphatic hydrocarbon, C 2 ⁇ C 7 a.
- the C 2 to C 7 aliphatic hydrocarbons include propane, butane, isobutane, pentane, isopentane, neopentane, hexane and the like.
- the expandable starch beads according to one embodiment of the present invention prepared by impregnating the starch-monomer copolymer with the above blowing agent have properties similar to those of conventional expandable polystyrene beads.
- Effervescent starch beads according to an embodiment of the present invention preferably comprises 90 to 99 parts by weight of starch-monomer copolymer and 1 to 10 parts by weight of blowing agent.
- the expandable starch beads according to an embodiment of the present invention preferably further comprises 0.1 to 10 parts by weight of an initiator and 0.1 to 10 parts by weight of a dispersant based on 100 parts by weight of the starch and monomer constituting the starch-monomer copolymer. can do.
- the initiator may be preferably composed of one or more selected from the group consisting of potassium persulfate, ammonium persulfate, benzoyl peroxide, ceric ammonium nitrate, azobisisobutyronitrile and tin octoate, but is not limited thereto. It is not.
- the type of the dispersant is not particularly limited, such as organic dispersant, inorganic dispersant, polyvinyl alcohol, polyvinylacetate, methyl cellulose, hydroxyethyl cellulose, polyvinylpyrrolidone, tricalcium phosphate, calcium carbonate, It may be composed of one or more selected from the group consisting of talc, bentonite and magnesium silicate.
- Effervescent starch beads according to an embodiment of the present invention is largely dependent on the size of the starch-monomer copolymer in the form of particles, for example having a diameter of 0.1 to 5.0 mm, preferably 0.3 to 3.0 mm It may be, but is not limited thereto.
- Method for producing expandable starch beads comprises the steps of preparing a starch-monomer copolymer; And impregnating a blowing agent into the prepared starch-monomer copolymer.
- the starch-monomer copolymer is selected from the group consisting of styrene, ⁇ -methylstyrene, lactide, lactic acid, acrylic acid, methacrylic acid, acrylic ester, methacrylic acid ester, acrylonitrile, acrylamide and caprolactone
- the blowing agent is composed of one or more selected from the group consisting of C 2 ⁇ C 7 aliphatic hydrocarbons, C 2 ⁇ C 7 halogenated hydrocarbons, and carbon dioxide.
- Preparing the starch-monomer copolymer in the method for producing expandable starch beads according to an embodiment of the present invention is preferably added to the reactor in a weight ratio of 10:90 to 90:10, the starch and 0.1 to 10 parts by weight of initiator, 0.1 to 10 parts by weight of dispersant and 100 to 2000 parts by weight of water are added to 100 parts by weight of the monomer, followed by reacting at a temperature of more than 30 ° C and less than 150 ° C for 1 to 10 hours. It is characterized by.
- the reaction temperature is preferably 50 ⁇ 120 °C
- the reaction time is preferably 3 to 8 hours.
- the initiator is preferably one selected from the group consisting of potassium persulfate, ammonium persulfate, benzoyl peroxide, ceric ammonium nitrate, azobisisobutyronitrile and tin octoate. It may be configured as described above.
- the dispersing agent in the preparation of the starch-monomer copolymer is preferably polyvinyl alcohol, polyvinylacetate, methylcellulose, hydroxyethyl cellulose, polyvinylpyrrolidone, tricalcium phosphate, calcium carbonate, talc, bentonite And it may be composed of one or more selected from the group consisting of magnesium silicate.
- the dispersant serves to stably starch the starch in the step of preparing the starch-monomer copolymer, and uniformly disperse the starch-monomer copolymer in the impregnation of the foaming agent described later.
- Impregnating the blowing agent in the method for preparing expandable starch beads according to an embodiment of the present invention preferably comprises a weight ratio of starch-monomer copolymer: foaming agent in a reactor prepared with the starch-monomer copolymer of 90:10 to 99:
- the blowing agent is added so as to be 1, and reacted at a temperature of 30 to 150 ° C. for 1 to 10 hours to impregnate the blowing agent in the starch-monomer copolymer.
- the reaction temperature in the impregnating the blowing agent is preferably 50 ⁇ 120 °C, the reaction time is preferably 3 to 8 hours. If the reaction temperature is less than 30 ° C.
- the content of the blowing agent may be insufficient. If the temperature exceeds 150 ° C., the starch-monomer copolymer may aggregate to form agglomerates. Further, the step of impregnating the blowing agent is carried out at about 5 to inert gas atmosphere of 20kg f / cm2, preferably 8 ⁇ 15kg f / cm2 nitrogen atmosphere.
- the expandable starch beads according to another embodiment of the present invention include fine pellets formed by extruding a mixture of a starch-monomer copolymer and a resin, and a blowing agent impregnated in the fine pellets.
- the starch-monomer copolymer is selected from the group consisting of styrene, ⁇ -methylstyrene, lactide, lactic acid, acrylic acid, methacrylic acid, acrylic acid ester, methacrylic acid ester, acrylonitrile, acrylamide and caprolactone
- One or more monomers to be formed are bonded to the starch.
- Starch-monomer copolymer in the effervescent starch bead according to another embodiment of the present invention is the same as described above in the effervescent starch bead according to an embodiment of the present invention and a detailed description thereof will be omitted.
- the resin is polystyrene, polyethylene, polypropylene, ethylene vinyl acetate, polylactic acid, polycaprolactone, polybutylene succinate, polybutylene succinate adipate and polybutylene It consists of 1 or more types chosen from the group which consists of adipate terephthalate.
- the blowing agent is composed of at least one member selected from the group consisting of C 2 to C 7 aliphatic hydrocarbons, C 2 to C 7 halogenated hydrocarbons, and carbon dioxide.
- the particulate pellet preferably includes 10 to 90 parts by weight of the starch-monomer copolymer and 10 to 90 parts by weight of the resin.
- the fine pellets preferably have a diameter of 0.5 to 5.0 mm, more preferably 1.0 to 3.0 mm.
- the size of the expandable starch beads according to another example of the present invention mainly depends on the size of the fine pellets.
- the expandable starch beads according to another embodiment of the present invention may preferably include 1 to 10 parts by weight of the blowing agent, and more preferably 0.1 to 10 parts by weight of the dispersant based on 100 parts by weight of fine pellets. do.
- the type of dispersant is not particularly limited, and is preferably polyvinyl alcohol, polyvinylacetate, methyl cellulose, hydroxyethyl cellulose, polyvinylpyrrolidone, tricalcium phosphate, calcium carbonate, talc, bentonite and magnesium silicate. It may be composed of one or more selected from the group consisting of.
- the foamed starch beads according to another embodiment of the present invention may further include a trace amount of the initiator introduced from the starch-monomer copolymer.
- Method for producing expandable starch beads comprises the steps of preparing a fine pellet by mixing and extruding the starch-monomer copolymer and resin; And containing a blowing agent in the prepared fine pellets.
- the starch-monomer copolymer is selected from the group consisting of styrene, ⁇ -methylstyrene, lactide, lactic acid, acrylic acid, methacrylic acid, acrylic ester, methacrylic acid ester, acrylonitrile, acrylamide and caprolactone
- One or more monomers to be formed are bonded to the starch.
- the resin is selected from the group consisting of polystyrene, polyethylene, polypropylene, ethylene vinyl acetate, polylactic acid, polycaprolactone, polybutylene succinate, polybutylene succinate adipate and polybutylene adipate terephthalate It consists of 1 or more types.
- the blowing agent is composed of at least one member selected from the group consisting of C 2 to C 7 aliphatic hydrocarbons, C 2 to C 7 halogenated hydrocarbons, and carbon dioxide.
- a method for preparing expandable starch beads may further include preparing a starch-monomer copolymer before preparing fine pellets, and preparing the starch-monomer copolymer may include:
- preparing the starch-monomer copolymer may include:
- the weight ratio of starch-monomer copolymer: resin of the step of preparing the fine pellets is preferably 10:90 to 90:10.
- the preparing of the pellets may be performed by a conventional extruder.
- impregnating the fine pellet with the blowing agent is preferably 1 to 10 parts by weight of the blowing agent per 100 parts by weight of the prepared pellet, and 0.1 to 10 weight of the dispersant. And 100 to 2000 parts by weight of water are added and reacted at a temperature of 30 to 150 ° C. for 1 to 10 hours.
- the reaction temperature is preferably 50 to 120 ° C, and the reaction time is 3 to 8 hours in the step of impregnating the blowing pellet in the fine pellets. If the reaction temperature is less than 30 ° C. in the step of impregnating the particulate pellet with the foaming agent, the content of the blowing agent may be inadequate.
- the particulate pellets may aggregate together to form agglomerates.
- the step of impregnating the foaming agent in the fine pellets is carried out at about 5 to inert gas atmosphere of 20kg f / cm2, preferably 8 ⁇ 15kg f / cm2 nitrogen atmosphere.
- the dispersant is preferably one selected from the group consisting of polyvinyl alcohol, polyvinylacetate, methyl cellulose, hydroxyethyl cellulose, polyvinylpyrrolidone, tricalcium phosphate, calcium carbonate, talc, bentonite and magnesium silicate. It consists of the above.
- the expandable starch beads according to the present invention can be molded into foams by foaming equipment of conventional expandable polystyrene.
- the foam refers to an article made by foaming the foamed starch beads, for example, a film, a sheet, an injection molded product such as styrofoam, a three-dimensional three-dimensional packaging material of various shapes, and the like, but is not limited thereto.
- the expandable starch beads according to the present invention can be foamed by any foaming equipment capable of a foaming process, as well as foaming equipment of conventional foamable polystyrene.
- Expandable starch beads were obtained in the same manner as in Preparation Example 1, except that 0.12 kg of potassium persulfate was used.
- Expandable starch beads were obtained in the same manner as in Preparation Example 1, except that ammonium persulfate was used instead of potassium persulfate.
- Expandable starch beads were obtained in the same manner as in Preparation Example 1, except that 9 kg of corn starch and 3 kg of styrene were used.
- Expandable starch beads were obtained in the same manner as in Preparation Example 1, except that 3 kg of corn starch and 9 kg of styrene were used.
- Expandable starch beads were obtained in the same manner as in Preparation Example 1, except that lactic acid was used instead of styrene and tin octoate was used instead of potassium persulfate.
- Effervescent starch beads were obtained in the same manner as in Preparation Example 1, except that tapioca starch was used instead of corn starch.
- Expandable starch beads were obtained in the same manner as in Preparation Example 1, except that butane was used instead of pentane.
- Figure 2 is a photograph showing the fine granules produced by the extruder in Preparation Example 10. Thereafter, 10 kg of the prepared pellets, 0.06 kg of polyvinyl alcohol, 30 kg of water, and 1 kg of pentane were placed in a reactor, and reacted for 8 hours at a temperature of 100 ° C. and a nitrogen atmosphere of 10 kg f / cm 2 for fine pentane. The pellet was impregnated. The reaction product was then filtered and dried at 30 ° C. to yield effervescent starch beads. 3 is a photograph showing the effervescent starch beads obtained in Preparation Example 10.
- Expandable starch beads were obtained in the same manner as in Production Example 10, except that 0.12 kg of potassium persulfate was used.
- Expandable starch beads were obtained in the same manner as in Preparation Example 10, except that ammonium persulfate was used instead of potassium persulfate.
- Expandable starch beads were obtained in the same manner as in Preparation Example 10, except that 9 kg of corn starch and 3 kg of styrene were used.
- Expandable starch beads were obtained in the same manner as in Preparation Example 10, except that 3 kg of corn starch and 9 kg of styrene were used.
- Effervescent starch beads were obtained in the same manner as in Preparation Example 10 except that lactic acid was used instead of styrene and tin octoate was used instead of potassium persulfate.
- Expandable starch beads were obtained in the same manner as in Preparation Example 10, except that tapioca starch was used instead of corn starch.
- Expandable starch beads were obtained in the same manner as in Preparation Example 10, except that butane was used instead of pentane.
- a starch-monomer copolymer was prepared by adding 6 kg of corn starch, 6 kg of styrene, 30 kg of water, 0.06 kg of potassium persulfate, and 0.06 kg of tricalcium phosphate into the reactor for 6 hours at a temperature of 30 ° C. Thereafter, the starch-monomer copolymer was filtered with water and washed with water, and dried with a hot air dryer at 60 ° C. 6 kg of dried starch-monomer copolymer, 0.06 kg of polyvinyl alcohol, 20 kg of water, and 1 kg of pentane were placed in a reactor and reacted for 8 hours at a temperature of 100 ° C. and a nitrogen atmosphere of 10 kg f / cm 2. At this time, the dried starch-monomer copolymer was not gelatinized to form expandable starch beads.
- a starch-monomer copolymer was prepared by adding 6 kg of corn starch, 6 kg of styrene, 30 kg of water, 0.06 kg of potassium persulfate, and 0.06 kg of tricalcium phosphate into the reactor for 50 minutes at a temperature of 60 ° C. Thereafter, the starch-monomer copolymer was filtered with water and washed with water, and dried with a hot air dryer at 60 ° C. 6 kg of dried starch-monomer copolymer, 0.06 kg of polyvinyl alcohol, 20 kg of water, and 1 kg of pentane were placed in a reactor and reacted for 8 hours at a temperature of 100 ° C. and a nitrogen atmosphere of 10 kg f / cm 2. At this time, the dried starch-monomer copolymer was not gelatinized to form expandable starch beads.
- a starch-monomer copolymer was prepared by adding 6 kg of corn starch, 6 kg of styrene, 30 kg of water, 0.06 kg of potassium persulfate, and 0.06 kg of tricalcium phosphate into the reactor for 6 hours at 150 ° C. At this time, the starch-monomer copolymer agglomerated with each other to form a lump, and the subsequent blowing agent impregnation process could not proceed.
- Fine pellets were prepared by passing a mixture of 6 kg of corn starch and 6 kg of polystyrene through an extruder. Thereafter, 10 kg of the prepared pellets, 0.06 kg of polyvinyl alcohol, 30 kg of water, and 1 kg of pentane were placed in a reactor, and reacted for 8 hours at a temperature of 100 ° C. and a nitrogen atmosphere of 10 kg f / cm 2 for fine pentane. The pellet was impregnated. At this time, a significant amount of the corn starch constituting the fine pellet was separated from the polystyrene. The reaction product was then filtered and dried at 30 ° C. to yield effervescent starch beads.
- the copolymerization rate of the prepared starch-monomer copolymer was analyzed in the process of obtaining the expandable beads of Preparation Examples 1 to 9 and Comparative Preparation Examples 1 and 2.
- the copolymerization rate of the starch-monomer copolymers prepared in Preparation Examples 10 to 18 is the same as that of the starch-monomer copolymers prepared in Preparation Examples 1-9, respectively.
- the copolymerization rate was calculated by the following formula after extracting and removing the uncopolymerized monomer to monomer between monomers from the starch-monomer copolymer using a soxhlet apparatus (solvent: toluene; 100 ° C; 24 hours).
- W 1 is the amount of starch-monomer copolymer and W 0 is the amount of added starch.
- the copolymerization rate of the starch-monomer copolymer calculated by the above formula is shown in Table 1 below.
- the copolymer when the starch-monomer copolymer was prepared, the copolymer was not produced when the reaction temperature was 30 ° C. or less, or the reaction time was 50 minutes or less. In addition, when the reaction temperature is 150 °C or more copolymers agglomerate with each other to form a foamed starch bead was impossible.
- FIG. 4 is a photograph showing a foam in the form of a plate prepared in Test Example 1.
- a foam was prepared in the same manner as in Test Example 1, except that the expandable starch beads obtained in Preparation Example 2 were used.
- a foam was prepared in the same manner as in Test Example 1, except that the expandable starch beads obtained in Preparation Example 3 were used.
- a foam was prepared in the same manner as in Test Example 1, except that the expandable starch beads obtained in Preparation Example 6 were used.
- a foam was prepared in the same manner as in Test Example 1, except that the expandable starch beads obtained in Preparation Example 7 were used.
- a foam was prepared in the same manner as in Test Example 1, except that the expandable starch beads obtained in Preparation Example 8 were used.
- a foam was prepared in the same manner as in Test Example 1, except that the expandable starch beads obtained in Preparation Example 10 were used.
- a foam was prepared in the same manner as in Test Example 1, except that the expandable starch beads obtained in Preparation Example 16 were used.
- a foam was prepared in the same manner as in Test Example 1, except that the expandable starch beads obtained in Preparation Example 17 were used.
- the foamed starch beads obtained in Preparation Example 10 were placed in a mold in the form of a rectangular box container mounted on the foaming equipment of the expandable polystyrene beads, and steamed and then foamed to prepare a foam.
- 5 is a photograph showing a foam in the form of a rectangular box container prepared in Test Example 10.
- a foam was prepared in the same manner as in Test Example 1, except that the expandable starch beads prepared in Comparative Preparation Example 5 were used. At this time, foaming was hardly achieved.
- the foamed starch beads prepared in Comparative Preparation Example 5 were introduced into an extruder-type foaming facility having a screw diameter of 55 mm and an L / D of 7, and foamed at a barrel temperature of 220 ° C. and a screw speed of 75 rpm to prepare a foam.
- the die of the extruder was then circular.
- Figure 6 is a photograph showing a peanut-shaped foam prepared in Comparative Test Example 2.
- a foam was prepared in the same manner as in Test Example 1 except that the expandable starch beads prepared in Comparative Preparation Example 6 were used.
- a foam was prepared in the same manner as in Test Example 1, except that the expandable polystyrene beads prepared in Comparative Preparation Example 7 were used.
- Figure 7 is a photograph showing a foam in the form of a plate prepared in Comparative Test Example 4.
- the apparent density of the foam was determined by measuring the volume and weights of the foam and the following formula.
- the foaming rate of the foam prepared from the expandable polystyrene beads was set to 100, and based on the relative foaming rate of the remaining foams was calculated. Foaming rate is inversely proportional to the apparent density of the foam.
- the compressive strength of the foam was measured using an Instron apparatus, and specifically, the compressive strength when the foam was deformed 10% was measured.
- Table 3 shows the results of the measurement of the apparent density, relative foaming rate, and compressive strength of the foams prepared in the test and comparative test examples.
- the foams prepared from the expandable starch beads of the present invention were found to have similar foaming rate and mechanical strength as the foams prepared from the expandable polystyrene beads.
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Abstract
Description
제조예 구분 | G(공중합율, %) |
제조예 1 | 25 |
제조예 2 | 26 |
제조예 3 | 20 |
제조예 4 | 15 |
제조예 5 | 12 |
제조예 6 | 15 |
제조예 7 | 28 |
제조예 8 | 24 |
제조예 9 | 22 |
비교예 1 | 0 |
비교예 2 | 0 |
제조예 구분 | 발포제 함량(%) |
제조예 1 | 3.9 |
제조예 2 | 3.6 |
제조예 3 | 3.2 |
제조예 4 | 3.4 |
제조예 5 | 3.1 |
제조예 6 | 3.4 |
제조예 7 | 4.5 |
제조예 8 | 3.8 |
제조예 9 | 3.2 |
제조예 10 | 3.0 |
제조예 11 | 3.0 |
제조예 12 | 2.9 |
제조예 13 | 3.1 |
제조예 14 | 2.9 |
제조예 15 | 3.0 |
제조예 16 | 3.6 |
제조예 17 | 3.1 |
제조예 18 | 2.9 |
비교제조예 6 | 1.0 |
비교제조예 7 | 4.8 |
시험예 구분 | 겉보기 밀도(㎏/㎥) | 상대적인 발포율(비교시험예 4의 발포체 기준) | 압축강도(㎏/㎠) |
시험예 1 | 17 | 100.0 | 0.9 |
시험예 2 | 18 | 94.4 | 0.9 |
시험예 3 | 20 | 85.0 | 1.0 |
시험예 4 | 18 | 94.4 | 0.9 |
시험예 5 | 15 | 113.3 | 0.8 |
시험예 6 | 17 | 100.0 | 0.8 |
시험예 7 | 22 | 77.3 | 1.2 |
시험예 8 | 24 | 70.8 | 1.3 |
시험예 9 | 21 | 81.0 | 1.2 |
시험예 10 | 22 | 77.3 | 1.2 |
비교시험예 1 | 35 | 48.6 | 2.1 |
비교시험예 2 | 10 | 170.0 | 0.6 |
비교시험예 3 | 29 | 58.6 | 1.8 |
비교시험예 4 | 17 | 기준(100) | 1.1 |
Claims (20)
- 전분-모노머 공중합체 및 상기 전분-모노머 공중합체에 함침된 발포제를 포함하고,상기 전분-모노머 공중합체는 스티렌, α-메틸스티렌, 락타이드, 락틱산, 아크릴산, 메타크릴산, 아크릴산 에스테르, 메타크릴산 에스테르, 아크릴로니트릴, 아크릴아미드 및 카프로락톤으로 이루어진 군에서 선택되는 1종 이상의 모노머가 전분에 결합되어 형성된 것이고,상기 발포제는 C2~C7의 지방족 탄화수소, C2~C7의 할로겐화탄화수소, 및 이산화탄소로 이루어진 군에서 선택되는 1종 이상으로 구성된 것을 특징으로 하는 발포성 전분 비드.
- 제 1항에 있어서,상기 전분-모노머 공중합체를 구성하는 전분 대 모노머의 중량비는 10:90 내지 90:10인 것을 특징으로 하는 발포성 전분 비드.
- 제 1항에 있어서,상기 발포성 전분 비드는 전분-모노머 공중합체 90~99 중량부 및 발포제 1~10 중량부를 포함하는 것을 특징으로 하는 발포성 전분 비드.
- 제 1항 내지 제 3항 중 어느 한 항에 있어서,상기 발포성 전분 비드는 상기 전분 및 모노머의 중량 합 100 중량부에 대하여 개시제 0.1~10 중량부 및 분산제 0.1~10 중량부를 더 포함하는 것을 특징으로 하는 발포성 전분 비드.
- 제 4항에 있어서,상기 개시제는 과황산칼륨, 과황산암모늄, 과산화벤조일, 세릭암모늄나이트레이트, 아조비스이소부티로니트릴 및 주석 옥토에이트로 이루어진 군에서 선택되는 1종 이상으로 구성되고,상기 분산제는 폴리비닐알콜, 폴리비닐아세테이트, 메틸셀룰로오스, 하이드록시에틸셀룰로오스, 폴리비닐피롤리돈, 트리칼슘포스페이트, 탄산칼슘, 탈크, 벤토나이트 및 마그네슘실리케이트로 이루어진 군에서 선택되는 1종 이상으로 구성되는 것을 특징으로 하는 발포성 전분 비드.
- 전분-모노머 공중합체와 수지의 혼합물을 압출하여 형성한 미립펠렛 및 상기 미립펠렛에 함침된 발포제를 포함하고,상기 전분-모노머 공중합체는 스티렌, α-메틸스티렌, 락타이드, 락틱산, 아크릴산, 메타크릴산, 아크릴산 에스테르, 메타크릴산 에스테르, 아크릴로니트릴, 아크릴아미드 및 카프로락톤으로 이루어진 군에서 선택되는 1종 이상의 모노머가 전분에 결합되어 형성된 것이고,상기 수지는 폴리스티렌, 폴리에틸렌, 폴리프로필렌, 에틸렌비닐아세테이트, 폴리락틱산, 폴리카프로락톤, 폴리부틸렌숙시네이트, 폴리부틸렌숙시네이트아디페이트 및 폴리부틸렌아디페이트테레프탈레이트로 이루어진 군에서 선택되는 1종 이상으로 구성되고,상기 발포제는 C2~C7의 지방족 탄화수소, C2~C7의 할로겐화탄화수소, 및 이산화탄소로 이루어진 군에서 선택되는 1종 이상으로 구성된 것을 특징으로 하는 발포성 전분 비드.
- 제 6항에 있어서,상기 미립펠렛은 전분-모노머 공중합체 10~90 중량부 및 수지 10~90 중량부를 포함하고,상기 발포성 전분 비드는 미립펠렛 100 중량부에 대하여 발포제 1~10 중량부를 포함하는 것을 특징으로 하는 발포성 전분 비드.
- 제 7항에 있어서,상기 미립펠렛은 0.5~5.0mm의 직경을 가지는 것을 특징으로 하는 발포성 전분 비드.
- 제 6항 내지 제 8항 중 어느 한 항에 있어서,상기 발포성 전분 비드는 미립펠렛 100 중량부에 대하여 분산제 0.1~10 중량부를 더 포함하는 것을 특징으로 하는 발포성 전분 비드.
- 제 9항에 있어서,상기 분산제는 폴리비닐알콜, 폴리비닐아세테이트, 메틸셀룰로오스, 하이드록시에틸셀룰로오스, 폴리비닐피롤리돈, 트리칼슘포스페이트, 탄산칼슘, 탈크, 벤토나이트 및 마그네슘실리케이트로 이루어진 군에서 선택되는 1종 이상으로 구성된 것을 특징으로 하는 발포성 전분 비드.
- 전분-모노머 공중합체를 준비하는 단계; 및상기 준비된 전분-모노머 공중합체에 발포제를 함침시키는 단계;를 포함하고,상기 전분-모노머 공중합체는 스티렌, α-메틸스티렌, 락타이드, 락틱산, 아크릴산, 메타크릴산, 아크릴산 에스테르, 메타크릴산 에스테르, 아크릴로니트릴, 아크릴아미드 및 카프로락톤으로 이루어진 군에서 선택되는 1종 이상의 모노머가 전분에 결합되어 형성된 것이고,상기 발포제는 C2~C7의 지방족 탄화수소, C2~C7의 할로겐화탄화수소, 및 이산화탄소로 이루어진 군에서 선택되는 1종 이상으로 구성된 것을 특징으로 하는 발포성 전분 비드의 제조방법.
- 제 11항에 있어서,상기 전분-모노머 공중합체를 준비하는 단계는 반응기에 전분과 모노머를 10:90 내지 90:10의 중량비로 첨가하고, 상기 전분 및 모노머의 중량 합 100 중량부에 대하여 개시제 0.1~10 중량부, 분산제 0.1~10 중량부 및 물 100~2000 중량부를 첨가한 후, 30℃ 초과 및 150℃ 미만의 온도에서 1~10시간 동안 반응시키는 것을 특징으로 하는 발포성 전분 비드 제조방법.
- 제 11항에 있어서,상기 발포제를 함침시키는 단계는 상기 전분-모노머 공중합체가 준비된 반응기에 전분-모노머 공중합체:발포제의 중량비가 90:10 내지 99:1이 되도록 발포제를 첨가하고 30~150℃의 온도에서 1~10시간 동안 반응시켜서 전분-모노머 공중합체에 발포제를 함침시키는 것을 특징으로 하는 발포성 전분 비드의 제조방법.
- 제 12항에 있어서,상기 개시제는 과황산칼륨, 과황산암모늄, 과산화벤조일, 세릭암모늄나이트레이트, 아조비스이소부티로니트릴 및 주석 옥토에이트로 이루어진 군에서 선택되는 1종 이상으로 구성된 것을 특징으로 하는 발포성 전분 비드의 제조방법.
- 제 12항에 있어서,상기 분산제는 폴리비닐알콜, 폴리비닐아세테이트, 메틸셀룰로오스, 하이드록시에틸셀룰로오스, 폴리비닐피롤리돈, 트리칼슘포스페이트, 탄산칼슘, 탈크, 벤토나이트 및 마그네슘실리케이트로 이루어진 군에서 선택되는 1종 이상으로 구성된 것을 특징으로 하는 발포성 전분 비드의 제조방법.
- 전분-모노머 공중합체와 수지를 혼합하고 압출하여 미립펠렛을 제조하는 단계; 및상기 제조된 미립펠렛에 발포제를 함유시키는 단계;를 포함하고,상기 전분-모노머 공중합체는 스티렌, α-메틸스티렌, 락타이드, 락틱산, 아크릴산, 메타크릴산, 아크릴산 에스테르, 메타크릴산 에스테르, 아크릴로니트릴, 아크릴아미드 및 카프로락톤으로 이루어진 군에서 선택되는 1종 이상의 모노머가 전분에 결합되어 형성된 것이고,상기 수지는 폴리스티렌, 폴리에틸렌, 폴리프로필렌, 에틸렌비닐아세테이트, 폴리락틱산, 폴리카프로락톤, 폴리부틸렌숙시네이트, 폴리부틸렌숙시네이트아디페이트 및 폴리부틸렌아디페이트테레프탈레이트로 이루어진 군에서 선택되는 1종 이상으로 구성되고,상기 발포제는 C2~C7의 지방족 탄화수소, C2~C7의 할로겐화탄화수소, 및 이산화탄소로 이루어진 군에서 선택되는 1종 이상으로 구성된 것을 특징으로 하는 발포성 전분 비드의 제조방법.
- 제 16항에 있어서,상기 미립펠렛을 제조하는 단계의 전분-모노머 공중합체:수지의 중량비는 10:90 내지 90:10인 것을 특징으로 하는 발포성 전분 비드의 제조방법.
- 제 16항에 있어서,상기 전분-모노머 공중합체를 구성하는 전분 대 모노머의 중량비는 10:90 내지 90:10인 것을 특징으로 하는 발포성 전분 비드의 제조방법.
- 제 16항에 있어서,상기 미립펠렛에 발포제를 함침시키는 단계는 반응기에 상기 제조된 미립펠렛 100 중량부 당 발포제 1~10 중량부, 분산제 0.1~10 중량부, 및 물 100~2000 중량부를 첨가하고, 30~150℃의 온도에서 1~10시간 동안 반응시키는 것을 특징으로 발포성 전분 비드 제조방법
- 제 19항에 있어서,상기 분산제는 폴리비닐알콜, 폴리비닐아세테이트, 메틸셀룰로오스, 하이드록시에틸셀룰로오스, 폴리비닐피롤리돈, 트리칼슘포스페이트, 탄산칼슘, 탈크, 벤토나이트 및 마그네슘실리케이트로 이루어진 군에서 선택되는 1종 이상으로 구성된 것을 특징으로 하는 발포성 전분 비드의 제조방법.
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CN111040080A (zh) * | 2020-01-08 | 2020-04-21 | 周丹 | 一种亲肤性吸液材料、制备方法及其用途 |
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US9018268B2 (en) | 2015-04-28 |
US20130116352A1 (en) | 2013-05-09 |
JP5710760B2 (ja) | 2015-04-30 |
KR20120007733A (ko) | 2012-01-25 |
JP2013530301A (ja) | 2013-07-25 |
KR101110638B1 (ko) | 2012-02-15 |
WO2012008784A3 (ko) | 2012-05-18 |
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