WO2006054727A1 - ポリプロピレン系樹脂予備発泡粒子および型内発泡成形体 - Google Patents
ポリプロピレン系樹脂予備発泡粒子および型内発泡成形体 Download PDFInfo
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- WO2006054727A1 WO2006054727A1 PCT/JP2005/021303 JP2005021303W WO2006054727A1 WO 2006054727 A1 WO2006054727 A1 WO 2006054727A1 JP 2005021303 W JP2005021303 W JP 2005021303W WO 2006054727 A1 WO2006054727 A1 WO 2006054727A1
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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
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
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- 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
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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
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
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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
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/16—Ethene-propene or ethene-propene-diene copolymers
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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
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
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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
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/16—Ethene-propene or ethene-propene-diene copolymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/14—Applications used for foams
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
Definitions
- the present invention relates to polypropylene-based resin pre-foamed particles and in-mold foam-molded articles, and more specifically, in the in-mold foam-molded articles having a thin-walled shape, which has been conventionally considered difficult,
- the present invention relates to a polypropylene-based resin pre-expanded particle capable of easily obtaining a filling property, and an in-mold foam-molded product obtained with the pre-expanded particle force.
- Polypropylene-based resin-molded internal foam molded products have superior chemical resistance, heat resistance, buffer performance, and compression strain recovery performance compared to polystyrene-based resin-molded internal foam molded products. Compared to the foam-molded body in the oil mold, it is excellent in heat resistance performance and compressive strength, so it is widely used as a buffer wrapping material, box, and automobile member.
- buffer packaging materials of various shapes they can be molded flexibly in accordance with the shape of products and members to be encapsulated and without cutting, and thus are widely used from electronic machines to industrial materials.
- In-mold foam molding using polypropylene-based pre-expanded particles of polypropylene-based resin generally uses a raw material having a low resin melting point temperature, which increases the secondary expansion ratio (secondary expansion ratio) when steam-heated.
- the use of a resin having a low melting point temperature can be a means for solving the above-mentioned problems. From contraction of the body In the case of molding for a box-shaped molded body where recovery of the resin is not sufficient, a phenomenon called “inside-down” tends to occur. Inward tilting means that there is a difference between the end and center dimensions of a box-shaped molded product. The absolute value of this difference varies depending on the size of the individual designed product. It will be a defective product that cannot be used as
- Patent Document 2 a method of mixing and using a polypropylene-based resin and a polypropylene-olefin-based resin having a specific Vicat softness point is disclosed (Patent Document 2).
- Patent Document 2 a method of mixing and using a polypropylene-based resin and a polypropylene-olefin-based resin having a specific Vicat softness point is disclosed (Patent Document 2).
- secondary foaming properties are not effective in improving the fusibility and inclining.
- Patent Document 3 polypropylene-based pre-foamed particles of a specific melt index resin obtained by mixing a specific melt index resin are excellent in surface properties and fusion. However, there is no specific description as to whether it can be applied to a molded body having a thin-walled shape that requires a higher degree of secondary foaming and fusing properties.
- Patent Document 1 Japanese Patent Laid-Open No. 2002-167460
- Patent Document 2 Japanese Patent Laid-Open No. 10-251437
- Patent Document 3 Japanese Patent Laid-Open No. 2000-327825
- An object of the present invention is to obtain a polypropylene-based resin-molded molded body having good secondary foaming properties, surface properties, and dimensional properties when producing molded products having various shapes including complex shapes.
- An object of the present invention is to provide polypropylene foam pre-expanded particles for in-mold foam molding. Means for solving the problem
- the present inventors have conducted extensive research and as a result, obtained the following knowledge. It was. That is, when trying to obtain a molded article having a complicated shape, in order to solve the above problems, at least a polypropylene-based resin having a melting point of 140 ° C or less and a melting point of 145 ° C or more.
- a mixed resin comprising a polypropylene-based resin, and adjusting the melt index to a predetermined value with an organic peroxide
- the resin is used as a base resin, so that steam during molding calorie can be obtained.
- the effect of the melting of the resin by heating can prevent the melting of the resin contributing to the shape retention, and the fluidity of the molten resin by the steam heating can be improved, thereby completing the present invention.
- the first of the present invention is a mixed resin comprising at least a polypropylene-based resin A having a resin melting point of 140 ° C. or less and a polypropylene-based resin B having a resin melting point of 145 ° C. or more.
- the present invention relates to a polypropylene resin pre-expanded foam particle characterized in that a polypropylene resin X having a melt index adjusted to 5 gZlOmin or more and less than 20 gZl0 min with an organic peroxide is used as a base resin.
- the polypropylene-based resin A is 60% by weight to 95% by weight, and the polypropylene-based resin B is 5% by weight or more and 40% by weight or less.
- the second aspect of the present invention is to apply an internal pressure of 0.1 kg / cm 2 —G or more to the polypropylene-based pre-foamed particles of the above-described polypropylene, and fill a mold that can be closed but cannot be sealed,
- the present invention relates to a polypropylene-based resin-molded foam-molded article characterized by being molded by heating with water vapor. The invention's effect
- the present invention since it has good secondary foaming properties and excellent surface properties and dimensional properties, the heat resistance, solvent resistance, heat insulation properties, and buffering properties inherent to polypropylene-based greaves are completely eliminated.
- Polypropylene capable of easily obtaining molded products of various shapes including complicated shapes without obstruction Can be obtained. Accordingly, it is possible to provide polypropylene-based pre-foamed particles of polypropylene resin that can be used widely and suitably in applications such as cushioning materials, heat insulating materials, and automobile members.
- FIG. 1 is a perspective view showing the shape of a box-shaped molded body used for molding evaluation.
- polypropylene ⁇ referred to in the present invention as a monomer, propylene 80 wt 0/0 or more, more preferably 85 wt% or more, even more preferably as long as it contains 90 wt% or more, As a There are no particular restrictions on the composition and synthesis method.For example, propylene homopolymer, ethylene propylene random copolymer, propylene monobutene random copolymer, ethylene monopropylene block copolymer, ethylene propylene-butene terpolymer. And so on. Further, if necessary, it may be processed with an organic peroxide for adjusting the molecular weight distribution and the melt index.
- the polypropylene-based resin X used as the base resin of the polypropylene-based pre-expanded particles of the present invention has at least a polypropylene-based resin A having a resin melting point of 140 ° C or less and a resin-based resin having a melting point of 145 ° C or more. It is made of a mixed resin containing polypropylene-based resin B.
- the polypropylene-based resin A in the present invention has a resin melting point of 140 ° C or lower, preferably 138 ° C or lower.
- polypropylene resin X forming the pre-foamed particles it is expected to greatly contribute to the fusion / secondary foaming of the melted particles by steam heating. Therefore, when trying to obtain a molded product having a thin-walled shape, it is preferable that polypropylene resin A is 60% by weight or more and 95% by weight or less in polypropylene resin X. 70% by weight or more More preferably, it is 95 wt% or less.
- Polypropylene resin B in the present invention has a resin melting point of 145 ° C or higher, more preferably 147 ° C or higher.
- the polypropylene-based resin X forming the pre-expanded particles it is expected to strongly influence the melting point on the high temperature side, which greatly contributes to shape retention during steam heating. Therefore, in the case where an inward collapse phenomenon is expected to occur, for example, to obtain a molded product such as a box shape, the polypropylene resin B is 5% by weight or more and 40% by weight or less in the polypropylene resin X. It is more preferable that the content is 5% by weight or more and 30% by weight or less. If the amount is less than 5% by weight, the internal falling phenomenon tends to occur. If the amount exceeds 40% by weight, the formability of the thin portion tends to be deteriorated.
- the melting points of the polypropylene-based resins A and B are determined by melting from 40 ° C to 210 ° C at a rate of 10 ° CZ using a differential scanning calorimeter (DSC). This is the crystal melting peak that gives the maximum endotherm in the obtained DSC curve.
- DSC differential scanning calorimeter
- the mixed resin containing the polypropylene base S and the polypropylene base S and B in the present invention has a melt index of 5 gZlOmin or more and 20 gZlOmin or less, preferably 5 gZlOmin using an organic peroxide. Adjust to above 15gZlOmin.
- the melt index is within this range, it is easy to achieve both high secondary foamability and good dimensionality.
- the melt index is less than 5 gZlOmin, the secondary foamability deteriorates.
- the melt index is greater than 20 gZlOmin, the dimensionality deteriorates.
- organic peroxides to be used include, but are not limited to, ketone peroxides such as methyl ethyl ketone peroxide and methyl acetoacetate peroxide; 1, 1 bis (t butyl peroxide) 3, 3 , 5 Trimethylcyclohexane, 1, 1 bis (t-butylperoxy) cyclohexane, n-butyl 4,4 bis (t-butylperoxy) valerate, 2, 2 bis (t-butylperoxy) B) Peroxyketals such as butane; permethane hydride mouth peroxide, 1, 1, 3, 3-tetramethylbutyl hydride mouth peroxide, diisopropylbenzene hydride mouth peroxide, cumene hydride mouth peroxide, etc.
- ketone peroxides such as methyl ethyl ketone peroxide and methyl acetoacetate peroxide
- Dicumyl baroxide 2,5 dimethyl-2,5 di (t-butylperoxy) hexane, at, —bis (t-butylperoxym-isopropyl) benzene, t-butyltamyl peroxide, di-t-butyl peroxide, 2, 5 Dialkyl peroxides such as dimethyl-2,5 di (t butyl beroxy) hexine 3; disilver oxides such as benzoyl peroxide; di (3-methinoleyl 3-methoxybutinole) peroxydicarbonate, G 2 —Methoxybutinoreperoxy carbonate Peroxydicarbonates such as t-butyl peroxytate, t-butyl peroxyisobutyrate, t-butyl peroxylaurate, t-butyl peroxy 3, 5, 5-trimethylhexanoate , T-butylperoxyisopropyl carbonate, 2,5 dimethyl-2,5
- polypropylene resin A and polypropylene resin B are mixed to form a mixed resin, and in addition to propylene resin X, Other synthetic resins other than polypropylene resin and Z or polypropylene resin may be added.
- Synthetic resins other than polypropylene resin include high-density polyethylene, medium-density polyethylene, low-density polyethylene, linear low-density polyethylene, linear ultra-low-density polyethylene, ethylene vinyl acetate copolymer, ethylene acrylic acid Examples thereof include ethylene-based resins such as copolymers and ethylene-methacrylic acid copolymers, and styrene-based resins such as polystyrene, styrene-maleic anhydride copolymers, and styrene-ethylene copolymers.
- a nucleating agent such as talc, an antioxidant, a metal deactivator, a phosphorus processing stabilizer, an ultraviolet absorber, an ultraviolet stabilizer, a fluorescent whitening agent, a metal stone Stabilizers such as cocoons or cross-linking agents, chain transfer agents, lubricants, plasticizers, fillers, reinforcing agents, pigments, dyes, flame retardants, antistatic agents, etc.
- a nucleating agent such as talc, an antioxidant, a metal deactivator, a phosphorus processing stabilizer, an ultraviolet absorber, an ultraviolet stabilizer, a fluorescent whitening agent, a metal stone Stabilizers such as cocoons or cross-linking agents, chain transfer agents, lubricants, plasticizers, fillers, reinforcing agents, pigments, dyes, flame retardants, antistatic agents, etc.
- the base resin is processed into resin particles.
- polypropylene-based resin A, polypropylene-based resin B, organic peroxide and the like are added in advance with an additive, an extruder, a binder, a bumper, and the like as necessary.
- It is melt-mixed using a mixer, roll, etc., and has a desired particle shape such as a cylindrical shape, an elliptical column shape, a spherical shape, a cubic shape, a rectangular parallelepiped shape, etc., and its particle weight is preferably 0.2 to: LOmg, more preferably Is molded into polypropylene-based resin particles that are 0.5-6 mg.
- Examples of the method of foaming the polypropylene-based resin particles into pre-expanded particles include, for example, dispersing in water together with a volatile foaming agent in a pressure-resistant container to obtain a propylene-based resin dispersion,
- the melting point of the polypropylene-based resin particles is heated to a temperature in the range of 25 ° C to + 10 ° C, more preferably 20 ° C to + 5 ° C, and volatilizes in the polypropylene-based resin particles.
- the dispersion of the polypropylene-based resin particles and water is introduced from the container while maintaining the temperature and pressure in the container constant under pressure higher than the vapor pressure indicated by the volatile foaming agent.
- the force by which the polypropylene-based pre-foamed particles can be obtained by discharging in a low pressure atmosphere is not limited to this method.
- an inorganic dispersant such as tricalcium phosphate, basic magnesium carbonate, calcium carbonate and the like, for example, dodecylbenzene sodium sulfonate, n-paraffin sulfonic acid soda, ⁇ —It is preferable to use a dispersion aid such as sodium olefin sulfonate.
- a dispersion aid such as sodium olefin sulfonate.
- the combined use of calcium triphosphate and sodium dodecylbenzenesulfonate is more preferred.
- the amount of dispersant and dispersion aid used varies depending on the type and the type and amount of polypropylene-based resin used, but usually 0.2 to 3 parts by weight of dispersant is added to 100 parts by weight of water. It is preferable to add 0.001 part by weight or more and 0.1 part by weight or less of a dispersion aid. In order to make the polypropylene-based resin particles have good dispersibility in water, it is usually preferable to use 20 to 100 parts by weight with respect to 100 parts by weight of water.
- a hydrocarbon or halogenated hydrocarbon having a boiling point of 50 to 120 ° C can be used, and specifically, propane, butane, pentane, hexane. , Dichlorodifluoromethane, dichlorotetrafluoroethane, trichlorodichloroethane, methyl chloride, methylene chloride, ethyl chloride, etc., which may be used alone or in combination of two or more.
- the amount of these volatile foaming agents used should be set in consideration of the type of foaming agent and the ratio of the amount of resin in the container to the space volume in the container. The amount is preferably 5 parts by weight or more and 50 parts by weight or less based on 100 parts by weight of the particles.
- the expansion ratio of the polypropylene-based resin pre-expanded particles obtained as described above is preferably 10 to 50 times, more preferably 15 to 40 times. When the expansion ratio is within this range, light weight and satisfactory compressive strength, which are advantages of the foam obtained by in-mold foam molding, tend to be obtained.
- the cell diameter of the polypropylene-based pre-foamed resin particles is preferably 50 ⁇ m or more and 1000 ⁇ m, more preferably 50 ⁇ m or more and 750 ⁇ m or less, and further preferably 100 m or more and 500 m or less. is there. If the cell diameter is within this range, moldability and dimensional stability tend to be high.
- the pre-expanded polypropylene-based resin particles of the present invention are obtained by measuring the expanded foam sample 4 to: LOmg from 40 ° C to 210 ° C at 10 ° CZ in the pre-expanded particle melting point measurement using a differential scanning calorimeter (DSC).
- DSC differential scanning calorimeter
- the DSC curve obtained when the temperature is raised at a rate of minutes, the melting peak force based on the crystalline state originally possessed by the base resin is obtained (hereinafter referred to as the low temperature side melting point TL), the low temperature It has two melting points, the melting point obtained from the melting peak appearing on the higher temperature side than the side melting point (hereinafter referred to as the high temperature side melting point TH), and the difference between the melting points, namely TH-TL (hereinafter referred to as the DSC peak difference).
- the DSC peak difference is less than 20.0 ° C, the range of molding conditions such as heating steam pressure and temperature range tends to be narrow, and good secondary foaming power and dimensionality tend to be difficult to obtain.
- the base resin of the polypropylene-based resin pre-expanded particles of the present invention originally has! /,
- the melting peak calorie (a / g) of the melting peak based on the crystalline state (hereinafter referred to as the low temperature peak) ⁇ a / g) and the melting peak (hereinafter referred to as the high temperature peak) i8 CiZg)
- the ratio of the melting peak calorific value based on the high-temperature melting point to the total melting peak (j8 Z (a + j8)) (hereinafter sometimes referred to as DSC peak ratio) 1S 10% or more and 50% or less It is more preferably 15% or more and 45% or less.
- the foamed particle sample 4 to lOmg was heated from 40 ° C to 210 ° C at a rate of 10 ° C / min and then melted.
- the temperature is again increased from 40 ° C to 210 ° C at the rate of 10 ° CZ and melted.
- the crystal melting peak that maximizes the endotherm obtained in the obtained DSC curve is defined as the resin melting point.
- the polypropylene-based resin X in the present invention preferably has a resin melting point of 130 ° C or more and 160 ° C or less, and more preferably 130 ° C or more and 155 ° C or less as a resin property. It is preferable. When the resin melting point is within the above range, a sufficiently fused in-mold foam molded article can be obtained using a conventional mold structure and molding machine, and an in-mold foam molded article having satisfactory compressive strength can be obtained. It tends to be obtained.
- a peak or a shoulder appears on the high temperature side of the crystal melting peak at which the endothermic amount becomes maximum in the measurement of the melting point of the resin by the differential scanning calorimetry method of the present invention. That is, in the present invention, it is preferable that the crystal melting peak having a crystal structure that melts at a low temperature and a crystal structure that melts at a high temperature have a shoulder on the high temperature side.
- the foam molded article of the present invention is obtained by an in-mold foam molding method using the polypropylene-based resin pre-expanded particles of the present invention.
- the method of forming the mold by heating with steam and filling the mold with a pressure of 0.1 kgZcm 2 — G or more to the polypropylene-based pre-foamed pre-expanded particles, filling the mold that can be closed but cannot be sealed has a thin shape It is preferred because it makes it easy to form a box-shaped product.
- the density of the in-mold foam molded article in the present invention thus obtained is preferably in the range of 0.012-0.075 gZcm 3 .
- An in-mold foam molded product with a density in this range has the light weight characteristic of an in-mold foam molded product, and the productivity is low because the percentage of defective products that hardly shrink or deform during molding is low. Tend to be good.
- An in-mold foam molded article having a desired density can be obtained by appropriately adjusting the expansion ratio of the polypropylene-based pre-foamed resin particles and the secondary expansion ratio at the time of in-mold foam molding.
- the foamed particle sample 4 ⁇ : LOmg was heated from 40 ° C to 210 ° C at a rate of 10 ° CZ and then melted, and then from 210 ° C After the thermal history of cooling to 40 ° C at a rate of 10 ° CZ, the absorption obtained in the DSC curve obtained when the temperature is raised again from 40 ° C to 210 ° C at a rate of 10 ° CZ and melted. The crystal melting peak at which the amount of heat was maximum was taken as the resin melting point.
- expanded particle sample 4 ⁇ In the differential scanning calorimeter (DSC) measurement, expanded particle sample 4 ⁇ : In the DSC curve obtained by melting LOmg from 40 ° C to 210 ° C at a rate of 10 ° CZ, the low temperature side The melting point obtained from the melting peak is the low temperature side melting point (sometimes referred to as TL), and the melting peak force that appears on the higher temperature side than the low temperature side melting point is the high temperature side melting point (sometimes referred to as TH). . The difference between TL and TH was taken as ⁇ t.
- foamed particle sample 4 ⁇ LOmg is 40 ° C
- the crystal melting peak with the highest endotherm in the DSC curve obtained when melting at 210 ° C at a rate of 10 ° CZ was taken as the resin melting point.
- the pre-foamed particle weight as a sample and the volume of the pre-foamed particles obtained by submerging the sample in ethanol in a volumetric flask were calculated, and the base resin density was divided to obtain the expansion ratio.
- the secondary expansion ratio in the present invention is a physical property value obtained by the following measuring method.
- the inorganic foaming agent is sufficiently applied to the surface of the pre-foamed particles, and the pre-foamed particles are treated so that they are not fused together by water vapor heating.
- the pre-expanded particles treated in (2) are put into a container such as a wire mesh that has sufficient structure to heat the pre-expanded particles with water vapor, and the container is placed in a molding machine (for example, P110 (Toyo Metal Co., Ltd.)). And steam pressure 3. Heat at OkgfZcm 2 — G for 5 seconds and then cool with water for 50 seconds.
- a molding machine for example, P110 (Toyo Metal Co., Ltd.
- the pre-expanded particles were given an internal pressure of 0. lkgZcm 2 G or more and filled in a mold that could be closed but could not be sealed. 3.
- Ethylene-propylene random copolymer (resin density 0.90 gZcm 3 , resin melting point 138.0 ° C) 90 parts by weight and ethylene-propylene random copolymer (resin density 0.90 gZcm 3 , resin melting point 147.0 ° C) 100 parts by weight of the resin with 10 parts by weight of the resin, 0.1 parts by weight of powdered talc, organic peroxide (Nippon Yushi Co., Ltd., Parhexa 25B) 0 3 parts by weight were dry blended, and the blended product was extruded with a 50 mm single screw extruder set at 200 ° C to give an ethylene-propylene random copolymer (resin density 0. Melt flow index 13.
- OgZlO content 1.3 mgZ of greaves particles with a melting point of 144.0 ° C.
- 100 parts by weight (50 kg) of the obtained rosin particles are placed in a 10 L pressure-resistant container having a stirrer, and calcium triphosphate (manufactured by Ohira Igaku Sangyo Co., Ltd.) 2.0 parts by weight and normal paraffin sulfone It was dispersed in 300 parts by weight of water in the presence of 0.03 part by weight of sodium acid. While stirring the dispersion, 18 parts by weight of isobutane was added, and the dispersion was heated to 141.5 ° C.
- Example 1 kneading was carried out by an extruder without adding the organic peroxide added during blending, and an ethylene-propylene random copolymer (wax density 0.90 g / cm 3 , melt index 1 index 9 8gZlO content, a melting point of 141.2 ° C), and the dispersion was heated to 138.5 ° C, and the internal pressure of the pressure vessel was adjusted to 17.8 kgfZcm 2 as in Example 1.
- pre-expanded particles having an expansion ratio of 26.5 times and a DSC peak ratio of 29% were obtained.
- the secondary expansion ratio of the pre-expanded particles was 2.10 times.
- the molded body surface particles had a slightly poor fusion, and a molded body was obtained.
- Example 2 an ethylene-propylene random copolymer (resin density 0.90 g / cm 3 , resin melting point 131.0 ° C) and 80 parts by weight of ethylene-propylene random copolymer Polymer (wax density 0.90 gZcm 3 , melting point melting point 147.0 ° C) 20 parts by weight mixed with powdered talc 0.1 parts by weight, organic peroxide 0.4 parts by weight Dry blending 'kneading by an extruder to obtain a rosin particle of ethylene propylene random copolymer (wax density 0.90gZcm 3 , melt flow index 15.8gZlO min, rosin melting point 136.9)
- the dispersion was heated to 139.0 ° C and the internal pressure of the pressure vessel was adjusted to 17.6 kgfZcm 2
- the foaming ratio was 24.4 times
- the DSC peak ratio was 25%
- Example 2 100 parts by weight of ethylene propylene random copolymer (resin density 0.90 gZcm 3 , melting point 131.0 ° C) and powdered talc only 0.1 part by weight Dry blending 'kneading with an extruder and ethylene-propylene random copolymer (resin density 0.90g / cm 3 , melt flow index 6.7g / 10min, resin melting point 130.5 ° C) The dispersion was heated to 124.0 ° C, and the foaming ratio was 26.2 times by the same method as in Example 1 except that the internal pressure of the pressure vessel was adjusted to 17. lkgf / cm 2 .
- Pre-expanded particles with a DSC peak ratio of 25% were obtained.
- the secondary expansion ratio of this pre-expanded particle is 1.51 It was twice.
- a molded body having a large dimensional shrinkage with poor fusion of the surface particles of the molded body was obtained.
- ethylene propylene random copolymer (resin density 0.90 gZcm 3 , resin melting point 131.0 ° C) 100 parts by weight of powdered talc 0.1 part by weight, organic Add 0.4 parts by weight of peroxide and blend and knead with an extruder.
- Ethylene-propylene random copolymer (resin density 0.90 gZcm 3 , melt flow index 17.4 gZlO content, resin melting point 130 3 ° C)
- the dispersion was heated to 124.0 ° C and the internal pressure of the pressure vessel was adjusted to 17.5 kgfZcm 2.
- the secondary expansion ratio of the pre-expanded particles was 0.94.
- ethylene propylene random copolymer (resin density 0.90 g / cm 3 , resin melting point 131.0 ° C) 70 parts by weight, ethylene-propylene random copolymer ( (Fabric density: 0.90gZcm 3 ; melting point: 138.0 ° C) Add 30 parts by weight of powdery torque, add 0.1 part by weight, blend and knead with an extruder, ethylene-propylene random A copolymer (wax density 0.90 g / cm 3 , melt flow index 7.
- ethylene propylene random copolymer (resin density 0.90 g / cm 3 , resin melting point 138.0 ° C) 50 parts by weight and ethylene-propylene random copolymer ( (Fabric density: 0.90 gZcm 3 , melting point: 147.0 ° C) 50 parts by weight is mixed with 100 parts by weight of powdered talc, 0.1 parts by weight, organic peroxide 0. 3 In the same way, parts by weight were added and kneaded with an 'dry blend' extruder, and an ethylene-propylene random copolymer (wax density 0.90 gZcm 3 , melt flow index 7.8 g / 10 min, rosin melting point 144.
- an ethylene propylene random copolymer (resin density 0.90 g / cm 3 , resin melting point 138.0 ° C.) 80 parts by weight and an ethylene-propylene random copolymer ( (Fabric density 0.90 gZcm 3 , melting point melting point 157.0 ° C) 20 parts by weight is mixed with 100 parts by weight of powdered talc 0.1 parts by weight, organic peroxide 0.2 parts by weight were added in the same manner, and the mixture was kneaded with an “dry blend” extruder, and an ethylene-propylene random copolymer (wax density 0.90 gZcm 3 , melt flow index 16. lg / 10 0 min. (Liquid melting point 145.3 ° C), and the dispersion was heated to 159.6 ° C, and the internal pressure of the pressure vessel was
- Pre-expanded particles of 2 times, DSC peak ratio 26%, At 25.5 ° C were obtained.
- the secondary expansion ratio of the pre-expanded particles was 2.65 times.
- an ethylene propylene random copolymer (resin density 0.90 g / cm 3 , resin melting point 138.0 ° C.) 80 parts by weight and an ethylene-propylene random copolymer ( (Fat density 0.90gZcm 3 , fusing point melting point 162.0 ° C) Using 20 parts by weight of a mixture, 100 parts by weight of the fat, powdered talc 0.05 parts by weight, organic peroxide 0.
Abstract
Description
Claims
Priority Applications (4)
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EP05807126.7A EP1829919B1 (en) | 2004-11-22 | 2005-11-18 | Pre-expanded polypropylene resin particle and molded object obtained by in-mold expansion |
JP2006545185A JP5041812B2 (ja) | 2004-11-22 | 2005-11-18 | ポリプロピレン系樹脂予備発泡粒子及び型内発泡成形体 |
US11/791,344 US8084509B2 (en) | 2004-11-22 | 2005-11-18 | Pre-expanded particulate polypropylene-based resin and in-mold expansion molded article |
CN200580039935XA CN101061163B (zh) | 2004-11-22 | 2005-11-18 | 聚丙烯系树脂预发泡粒子和模内发泡成形体 |
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EP (1) | EP1829919B1 (ja) |
JP (1) | JP5041812B2 (ja) |
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JP2008255213A (ja) * | 2007-04-04 | 2008-10-23 | Kaneka Corp | ポリプロピレン系樹脂予備発泡粒子および型内発泡成形体 |
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JP2013155386A (ja) * | 2013-05-20 | 2013-08-15 | Kaneka Corp | ポリプロピレン系樹脂予備発泡粒子の製造方法 |
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JPWO2016060162A1 (ja) * | 2014-10-15 | 2017-08-03 | 株式会社カネカ | ポリプロピレン系樹脂発泡粒子、ポリプロピレン系樹脂型内発泡成形体およびその製造方法 |
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WO2016060162A1 (ja) * | 2014-10-15 | 2016-04-21 | 株式会社カネカ | ポリプロピレン系樹脂発泡粒子、ポリプロピレン系樹脂型内発泡成形体およびその製造方法 |
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JP2017019980A (ja) * | 2015-07-15 | 2017-01-26 | 株式会社ジェイエスピー | プロピレン系樹脂発泡粒子及び発泡粒子成形体 |
US10487188B2 (en) | 2015-07-15 | 2019-11-26 | Jsp Corporation | Propylene resin foamed particle and foamed particle molded body |
WO2019220994A1 (ja) | 2018-05-15 | 2019-11-21 | 株式会社カネカ | ポリプロピレン系樹脂発泡粒子、ポリプロピレン系樹脂型内発泡成形体、およびポリプロピレン系樹脂発泡粒子の製造方法 |
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Publication number | Publication date |
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US8084509B2 (en) | 2011-12-27 |
CN101061163B (zh) | 2012-12-05 |
EP1829919B1 (en) | 2014-01-22 |
EP1829919A4 (en) | 2009-07-08 |
CN101061163A (zh) | 2007-10-24 |
JPWO2006054727A1 (ja) | 2008-06-05 |
MY143813A (en) | 2011-07-15 |
JP5041812B2 (ja) | 2012-10-03 |
US20080039588A1 (en) | 2008-02-14 |
EP1829919A1 (en) | 2007-09-05 |
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