TW201035193A - Expandable polystyrene type resin pellets for foaming with low expansion ratio and production method thereof, expanded pellets foamed with low expansion ratio, expanded form foamed with low expansion ratio and cushion material for hume pipe, and producti - Google Patents

Abstract

The present invention provides expandable polystyrene type resin pellets for foaming with low expansion ratio consisting of polystyrene type resin contains a foaming agent. These pellets are characterized by coating pellets of the polystyrene type resin with 0.02-2.5 parts by mass of higher fatty acid amides and 0.02-2.5 parts by mass of higher fatty acid triglyceride toward 100 parts by mass of the pellets. Furthermore, an average diameter of these pellets is 300-2500 μ m. The present invention also provides expanded pellets foamed with low expansion ratio which are obtained by foaming the expandable polystyrene type resin pellets with low expansion ratio and an expanded form foamed with low expansion ratio which are obtained by foaming the expanded pellets in a mold. According to the present invention, expandable polystyrene type resin pellets for foaming with low expansion ratio which provides expanded pellets which can fusion with high ratio when foaming the expanded pellets in the mold and having high extensibility can be provided. The expandable polystyrene type resin pellets for foaming with low expansion ratio of the present invention are suitable for producing the expanded form having high bending strength and high compressive strength.

Description

裘 发泡 发明 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘 裘When the low-polystyrene-based resin foam molded article is used twice, the foaming particles suitable for use in the production of the foamed molded article have a high fusion rate, excellent elongation between the expanded particles, and bending. A low-expansion foam molded body having high strength and compressive strength. The low-expansion foam molded body obtained by foaming and forming the foamed polystyrene-based resin particles for low-pressure molding can be used in the civil engineering field such as a buffer material for a hum pipe (hume pipe concrete propulsion pipe). , building materials such as floor materials, etc. The present application claims priority based on Japanese Patent Application No. 2009-37165, filed on Jan. 19, 2009, in Japan, the disclosure of which is incorporated herein. [Prior Art] The expansion ratio is U i 2 . The vesicle molded body of the double-fold polystyrene-based resin is produced by the (iv) foam molding method. In this way, the unexpanded particles of the foaming load are directly foamed at a low magnification which is pre-expanded at a low magnification of a total (10) k: : Γ = Γ 2 ° times = Γ Γ 模 模 模 • • • • • • • • • • • • • • • • • • • Heat, foam, and fuse the particles inside. The foaming body of the gynecological tree wax is taken from the mold. = The shape of the low-poly phenylene field is used. (4) Double Μ To be in the field, to build the material, important Θ and right ... A olefin foam molded body is required to have the important strength of the 疋 疋 has horse strength (bending strength, for the Hume tube (concrete propulsion pipe) '' and special). 4 Temple J is the most important for cushioning materials 321808 3 201035193 The prior art of the present invention includes Patent Documents 丨 to 4. Patent Document 1 discloses a foamable styrene resin particle characterized by containing a volatile foaming agent. The foaming styrene resin particle of the content of the styrene monomer is 1000 ppm or less, and the composition of the particle surface coating is: fatty acid amide with respect to 1 part by mass of the resin particle. And fatty acid bisamide At least one of the selected species is 〇. 〇 1 part by mass or more 5. 5 parts by mass or less, and the fatty acid metal salt is 〇 2 parts by mass or more and 1 〇 part by mass or less, and the amine valence of the fatty acid decylamine and fatty acid bis-amine is at In the [0029] section, the (tetra) acid decylamine which can be used is exemplified, and the fatty acid bis-amine which can be used is exemplified in the section [Deleted]. Patent Document 2 discloses a foamable styrene for food containers. 01至0. 5。 The resin particles, the content of the styrene styrene monomer is less than or equal to the foaming styrene resin particles, and the surface of the particles is 100 parts by weight relative to the resin particles. A mass part of the fatty acid guanamine and/or a fatty acid bis-amine is covered. Patent Document 3 discloses a method for producing a foam-coated foamed polystyrene-based granule, which is hidden as: In the aqueous dispersion of the resin particles, a slip aqueous dispersion is added and mixed, and the slip-water slurry is previously dispersed in a finely powdered, water-insoluble slip agent with an anionic or cationic surfactant, and then In the mixed dispersion, added as described above The surfactant of the opposite nature of the surfactant is in the amount of the surfactant which is brought in by the aqueous dispersion of the lubricant, and covers the surface of the resin particle with the above-mentioned slip agent. For the 321808 4 201035193 foaming polystyrene particles lkg, adding 12-hydroxystearic acid triglyceride having an average particle diameter of 60 / im 1. Og and an average diameter of 70 / / m of ethyl bis stearic acid Further, ethylene bis stearamide is used as a slip agent, and a lubricant is applied to the surface of the particles. Patent Document 4 discloses a foamable resin particle which is obtained by modifying a polystyrene resin. 100 parts by mass of the resin particles are obtained by impregnation of a foaming agent in an amount of 7 parts by mass or more. The modified polystyrene resin is obtained by impregnating and polymerizing a styrene monomer with polyethylene resin particles, and containing 50 to 80% by mass of the polystyrene resin component and 20 to 50% of the polyethylene resin component. %; the blowing agent contains 10 to 40% by mass of propane and 60 to 90% by mass of butane. In the section [0044], it is described that the surface of the expandable resin particles may be covered with triglyceride 12-hydroxystearic acid, triglyceride stearate, decyl stearate, decylamine 12-hydroxystearate Etc. as a fusion promoter. [Patent Document] Japanese Patent Laid-Open Publication No. Hei. No. Hei. No. Hei. 7-47664 (Patent Document 4) [Problems to be Solved by the Invention] However, the prior art disclosed in Patent Documents 1 to 4 has the following problems. Patent Document 1 describes a foamable styrene resin particle, 5 321 808 201035193, which is a temporary oyster shell with respect to the expandable styrene resin particles, and is composed of lanthanide and fatty acid bis-amine. At least 丨 做 做 融 、 、 、 、 、 、 、 、 曰 脂肪酸 脂肪酸 脂肪酸 脂肪酸 脂肪酸 脂肪酸 脂肪酸 脂肪酸 脂肪酸 脂肪酸 脂肪酸 脂肪酸 脂肪酸 脂肪酸 脂肪酸 脂肪酸 脂肪酸 脂肪酸 脂肪酸 脂肪酸 脂肪酸 脂肪酸 脂肪酸 脂肪酸 脂肪酸 脂肪酸 脂肪酸 脂肪酸 脂肪酸 脂肪酸 脂肪酸 脂肪酸 脂肪酸 脂肪酸 脂肪酸 脂肪酸In combination with the fusion promoter and the lumping inhibitor described in Document 1, the fusion ratio and the elongation between the expanded beads of the obtained foam molded article are insufficient, and the strength of the low-foam molded article cannot be obtained. improve. Patent Document 2 is related to patent documents! In the same manner, in the case of producing a low-expansion molded article having a size of 5 times, the combination of the fusion promoting agent and the generization preventing agent described in Patent Document 2, the foamed particles of the obtained foamed molded article = insufficient contact and elongation. In the example of the patent document 3 which is not able to obtain a low-expansion molded body, it is described in the foaming polystyrene:: surface, 12, stearic acid triglyceride is added The amine acts as a slip agent and coats the surface of the particles with a slip agent. However, in the production of a multiple of U to 20 times the foaming ratio, the combination of the lubricants is low in the foamed particles of the obtained foamed molded article: the contact ratio (four) is low, so that a high low-expansion molded body is produced. The sleepy tree r::::4 is a high-strength low-expansion molded body of the present invention which is a stupid ethylene-modified polyethylene which is recovered from hydrazine. The surface of the expandable resin particles is 12 (four), and examples thereof include those in which the hard (tetra)triglycerin is covered, and the surface-coated foamed resin particles of 321 808 6 201035193. In addition, when the surface of the foamable resin particle which consists of a polystyrene-type resin is covered with the 12-glycolyl stearic acid triglyceride alone, the fusion ratio of the foamed particle of the obtained foaming molded body will be Since it is lowered, it is difficult to produce a low-expansion molded body having high strength. The present invention has been made in view of the above circumstances, and it is an object of the invention to provide a foamable polystyrene resin particle for molding at a low magnification, which is suitable for producing a low-expansion foam. The molded body is a low-expansion molded body obtained by in-mold foam molding, and has a high melting ratio between the foamed particles, and has excellent elongation between the expanded particles, and has high bending strength and compressive strength. . [Means for Solving the Problem] In order to achieve the above object, the present invention provides a foamable polystyrene resin particle for molding at a low magnification, which is formed by a polystyrene resin containing a foaming agent and is relatively average The amount of the foaming polystyrene resin particles having a particle diameter of from 3 Å to 25 〇〇vm is 1 part by mass, and the high-fat fatty acid amine is used in an amount of from 0.2 to 2.5 parts by mass with the higher fatty acid. Glycol vinegar 0 02 to 2. 5 parts by mass to cover the surface of the particles. Further, the present invention provides a low-expansion foamed particle obtained by heating the low-folding-type fine-polystyrene-based resin particles and foaming them into a total foaming ratio of 2.0 to 20 times. Moreover, the present invention provides a low-expansion molded article in which the foaming ratio is in the range of 1.5 to 20 times, in which the foamable polystyrene resin particles or low-expansion particles of the low-molding molding are loaded. The inside of the cavity of the molding machine having a cavity that conforms to the desired molded shape is obtained by foam molding in the mold. 5至20倍范围内。 The 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。. Further, the present invention provides a method for producing foamable polystyrene resin particles for molding at a low magnification, which is formed of a polystyrene resin containing a foaming agent and has an average particle diameter of 300 am to 2500 /zm. 5质量份的和和。 The mass of the foaming polystyrene resin particles in the range of 1 〇〇 by mass, adding a higher fatty acid amide oxime. 02 to 2. 5 parts by mass and higher fatty acid triglyceride 〇. 〇 2 to 2. 5 parts by mass The higher fatty acid decylamine and the higher fatty acid triglyceride are mixed on the surface of the expandable polystyrene resin particles to obtain the foamable polystyrene resin particles for low-molding. Moreover, the present invention provides a method for producing foamable polystyrene resin particles for molding a low-power molding, which comprises dispersing an additive water in which a fine powder of a higher fatty acid decylamine and a higher fatty acid triglyceride are dispersed as a surfactant in advance. The liquid is added to the foamable polystyrene resin particles which are obtained from a polystyrene resin containing a foaming agent and have an average particle diameter of from 300 to 550 to 2,500 Å. In the aqueous dispersion, the mixture is dehydrated and dried to obtain the foamable polystyrene resin particles for low-molding of the present invention. Moreover, the present invention provides a method for producing foamable polystyrene resin particles for molding at a low magnification, which is formed of a polystyrene resin containing a foaming agent and has a particle diameter of 850 #111 to 2000 /zm. In the aqueous dispersion of the expandable polystyrene resin particles in the range, the fine powdery fatty acid guanamine and the higher fatty acid triglyceride and the additive water dispersed by the anionic or cationic surfactant are added and mixed in advance. a dispersion, and then a surfactant having a property opposite to that of the aforementioned surfactant, is added to the mixed dispersion, and the amount is sufficient to neutralize the amount of the surfactant contained in the aqueous dispersion of the additive, and the amount is advanced. The fatty acid decylamine and the higher fatty acid triglyceride are adhered to the surface of the expandable polystyrene resin particles to obtain the above-described low-expansion foaming polystyrene resin particles of the present invention. Moreover, the present invention provides a method for producing a low-expansion foam molded article, which is characterized in that the foamable polystyrene resin particles or low-expansion foam particles for low-molding are loaded in a mold cavity having a shape to be formed. In the mold cavity of the molding machine, a foamed crucible is formed in the mold in a range of 1.5 to 20 times the expansion ratio. The singularity of the present invention is in the range of 1.5 to 10 times. [Effects of the Invention] The expandable polystyrene resin particles for low-molding of the present invention have the properties of the expandable polystyrene resin particles 100 in the range of 300 μm to 2500 μm. 5质量份的结构。 The portion of the structure of the surface of the particle is covered with a high-quality fatty acid decylamine 0. 02 to 2. 5 parts by mass with a higher fatty acid triglyceride 0. 02 to 2. 5 parts by mass. As a result, the low-expansion foaming polystyrene-based resin particles of the low-molding molding or the low-expansion foaming particles obtained by foaming the particles at a low magnification are foamed and molded in the mold. The foamed molded article has excellent fusion ratio and elongation between the expanded particles, and is excellent in bending strength and compressive strength. Therefore, the expandable polystyrene resin particles for low-molding of the present invention can be used for producing a low-expansion molded article excellent in bending strength and compressive strength. 9 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 The foam particles are therefore useful for producing a low-expansion molded article excellent in bending strength and compressive strength. 5倍倍倍倍倍倍倍倍倍倍倍倍倍倍倍倍倍倍倍倍倍倍倍倍倍倍倍倍倍倍倍In the range, the fusion ratio and the elongation between the foamed particles are good, and the bending strength and the compressive strength are excellent, and it is possible to use a buffer material such as a buffer for a Hume tube (concrete propulsion pipe) which requires high strength and long-term durability. Building materials such as fields and floor materials. In the low-expansion molded body of the buffer material for a Hum tube of the present invention, the foaming ratio is in the range of 1.5 to 10 times, so that the fusion ratio and the elongation between the expanded particles are improved, and the bending strength is improved. It has excellent compressive strength and is excellent in high strength and long-term durability. [Embodiment] The expandable polystyrene resin particles for low-molding of the present invention are characterized by being composed of a polystyrene-based resin containing a foaming agent and having an average particle diameter of 300 // m to 2500 / The mass of the surface of the particle is covered with a high-quality fatty acid decylamine. 0.02 parts by mass with a higher fatty acid triglyceride. . The polystyrene resin which is a matrix of the expandable polystyrene resin particles for low-molding of the present invention is mainly composed of polystyrene, may be a homopolymer of styrene, or may be α-A. Styrene, p-nonylbenzene 10 321808 201035193 Styrene derivatives such as ethylene, tert-butyl styrene, chlorostyrene, methyl acrylate, butyl acrylate, methyl methacrylate, methacrylic acid Mercaptoacetic acid, such as acrylic acid, acrylic acid, methacrylic acid acrylate, or acrylonitrile, dimethyl fumarate, diethyl fumarate, etc. . Further, a bifunctional monomer such as divinylbenzene or alkanediol dimethyl acrylate may be used in combination. In the present invention, an ideal polystyrene resin is a homopolymer of styrene. The foaming agent contained in the expandable polystyrene resin particles may be either a volatile foaming agent or a decomposable foaming agent. The volatile blowing agent may, for example, be an aliphatic hydrocarbon, an alicyclic hydrocarbon, an i hydrocarbon, an ether, a ketone or the like. Examples of the aliphatic hydrocarbons include, for example, propylene oxide, butyl sinter (Zhengdingyuan, isobutylene), pentane (positive sinter, isoprene, etc.), and the like, for example, cyclopentane and ring. Hexane, etc. The halogenated hydrocarbon may, for example, be one or more selected from the group consisting of a halogen hydrocarbon such as trichlorofluoromethane, trichlorotrifluoroethane, tetrafluoroethane, chlorodifluoroethane or difluoroethane. Further, examples of the ether include dimethyl ether and diethyl ether; and the fluorenone may, for example, be propyl hydrazine or methyl ethyl hydrazine. Further, the decomposable foaming agent may, for example, be sodium hydrogencarbonate, sodium carbonate, ammonium hydrogencarbonate or the like; an schoric acid, an azide compound or an inorganic foaming agent such as sodium hydride; An organic foaming agent such as azodicarbonamide, barium azodicarboxyl, or dinitrosopentamethylene tetramine. These foaming agents may be used singly or in combination of two or more kinds. In the present invention, the average particle diameter of the expandable polystyrene-based resin particles is in the range of 300//m to 2500/zm, and preferably in the range of 11321808 201035193 650 of 650/zm to 2500/zm. Good is in the range of 8 0 〇M m to 2 〇〇〇# m. When the average particle diameter of the expandable polystyrene-based resin particles is less than the above range, the foamed polystyrene-based resin particles for low-molding which are produced by using the resin particles as a matrix, or a low magnification thereof The low-expansion foamed particles obtained by pre-expansion are filled in the cavity of the molding machine, and when the foam is molded in the mold to produce a low-expansion molded body, the interval between the particles becomes narrow, and the water vapor cannot be uniformly dried. The fusion ratio of the foamed molded article known as the cloth is not uniform, and a low-expansion molded body having a sufficient strength may not be obtained. On the other hand, when the average particle diameter of the expandable polystyrene resin particles exceeds the above range, the texture of the particles becomes large, and it is difficult to carry the particles into the cavity or to uniformly load the particles. Moreover, it becomes a manufacturing which is not suitable for the reticular shape foam molding. In the range in which the foaming property of the resin particles and the mechanical strength of the low-expansion molded article are not affected, the hair/packaged polystyrene-based resin particles are also added with various additives, for example, foaming. Auxiliaries, slip agents, shrinkage anti-oxidation inhibitors, charge inhibitors, flame retardants, UV absorbers, light m colorants, inorganic bubble nucleators, inorganic fillers, and the like. The foamable polystyrene-based resin particles for low-profile molding of the present invention are used in the following (10) parts by mass of the foamable polystyrene tree, and the high-grade fatty acid amide 〇. The mass fraction is made up of the high-grade fatty acid triglycerin oxime 02 to 9.5.f* and covers the surface of the teacher. Here, "covering particles" 疋 咼 咼 咼 咼 醯 与 与 与 与 与 与 与 与 与 与 高级 η 在 在 在 在 在 在 在 在 在 在 在 在 。 在 。 。 。 。 。 。 。 。 。 In other words, the fine powder of the aforementioned additive may be in a state of being micro-stated on the surface of the tree, and any one of various combinations of the state in which the surface layer of the lipid particles is completely impregnated in the tree 321808 12 201035193 may be intended. . The higher fatty acid guanamine of one of these additives may, for example, be decyl citrate, decyl laurate, decyl myristate, decyl palmitate, decylamine stearate or arachidic acid. Amine, behenic acid decylamine, lignoceric acid decylamine, 12-alkyl stearic acid amine, oleic acid decylamine, erucic acid ii amine, castor Alnic acid (ricino 1 eic acid) and other amines. Among them, stearic acid amine and palmitic acid amide are preferred. Further, the "high-grade fatty acid guanamine" in the present invention does not contain a fatty acid bis-guanamine such as ethyl bis-stearate. 5质量份范围内。 The amount of the above-mentioned high-grade fatty acid phthalamide is in the range of 0.02 to 2.5 parts by mass of the foamable polystyrene resin particles. 5质量至0.40质量份的范围内的范围内的范围内的范围内的范围内的范围内的范围内的范围内的范围内的范围内的范围内的范围内。 Within the scope. When the amount of the coating is less than 0.02 parts by mass, in the low-expansion molded body produced by the in-mold expansion molding, the fusion between the expanded beads is deteriorated, and a high-strength low-expansion molded body cannot be obtained. . On the other hand, when the amount of the coating exceeds 2.5 parts by mass, the fusion is also deteriorated, and a high-strength low-expansion molded body cannot be obtained. The higher fatty acid triglyceride of the other additive may be selected from various triglycerides containing a fatty acid having 10 or more carbon atoms, and examples thereof include vegetable oils such as olive oil, rapeseed oil, soybean oil, and broccoli oil. ; animal fats such as lard, tallow; synthesis of triglyceride stearate, 12-hydroxy 13 321808 201035193 triglyceride stearate, triglyceride palmitate, semi-synthetic fats and the like. Among them, from the viewpoint of chemical stability and the like, 12-hydroxystearic acid triglyceride or the like is preferable. θ The amount of the higher fatty acid triglyceride is in the range of 2 to 25 parts by mass based on 100 parts by mass of the foamable polystyrene resin particles. The range of from 0.02 to 1.5 parts by mass is preferably in the range of from 0.06 to 0.50 parts by mass. When the amount of the coating is less than 质量2 parts by mass, the low-expansion molding produced by the above-mentioned in-mold expansion molding does not cause the elongation of the expanded particles to be deteriorated, and the number of pores between the expanded particles becomes variable. There are many, and the appearance is poor, and a high-strength low-expansion molded body cannot be obtained. On the other hand, when the amount of the coating exceeds 2.5 parts by mass, the elongation is deteriorated, and the high-strength low-expansion molded article cannot be obtained. Next, a method for producing the foamable polyphenylene particles for low-molding of the present invention will be described. In the production method of the present invention, the foamable polystyrene-based tree can be produced by using various conventionally known methods for producing foamed resin particles. = Among these methods, (1) suspension polymerization method, (2) extrusion-water cut-off = rational 0 ' (1) suspension polymerization method

Polystyrene-branched H-ethylene monomer was prepared by suspension polymerization: _ red olefins as other monomers as a general suspension polymerization method for polymerization in the medium; also ^ monomer dispersed in aqueous media In the polystyrene tree wax 321808 14 201035193, a so-called suspension seed polymerization method in which one side is immersed in seed particles is polymerized. In the aqueous medium used for the suspension polymerization, a water-insoluble inorganic substance such as calcium phosphate, magnesium pyrophosphate, sodium pyrophosphate or magnesium oxide, or a sodium benzoate-type sodium-based surfactant may be added as a dispersing agent. Further, in the aqueous medium, a foaming aid, a slip agent, a shrinkage preventive agent, an oxidation preventive agent, a charge preventive agent, a flame retardant, an ultraviolet absorber, a light stabilizer, a colorant, and an inorganic bubble nucleating agent may be added. Various additives such as inorganic fillers. The polymerization initiator used in the suspension polymerization is not particularly limited as long as it is a compound used in the conventional polymerization, and examples thereof include benzoyl peroxide and di- and tri-butyl peroxide. Di-tert-butyl peroxide, t-butyl perbenzoate, dicumyl peroxide, 2,5-dimercapto-2,5-di - Tert-butyl butyl peroxide, tertiary butyl peroxy-3, 5, 5-tridecyl hexanoate, tertiary butyl-peroxide-2-Q ethylhexyl carbonate, etc., alone It can also be used in combination or in combination of two or more. When the amount of the polymerization initiator added to the permanent medium is small, the time required for the polymerization of the styrene monomer is too long. On the other hand, when the amount of the polymerization initiator is too large, the molecular weight of the obtained polystyrene resin is lowered. The amount of the granules is preferably from 0.2 to 0.8 parts by mass, preferably from 0.1 to 2 parts by mass. After the above various materials are placed in a reaction vessel, they are heated to a temperature higher than the temperature at which the styrene monomer starts to polymerize, and suspension polymerization is carried out. After the suspension polymerization is completed, the obtained polystyrene-based polystyrene 15 321808 201035193 resin particles are washed, dried, and screened to select polystyrene having an average particle diameter of 300 /zm to 2500 #m. The tree is a moon particle. / Next, the foaming agent is impregnated from the polystyrene resin particles in the dry rim of the 丨η in the obtained average granules from 300 to 2500 am to produce foamable polystyrene resin particles. A method of impregnating a foaming agent into a coarse polystyrene resin can be carried out by a known method. Specifically, the polystyrene resin particles, a dispersing agent, and water are added to an autoclave, and the mixture is stirred to make the polystyrene. A method in which a dispersion liquid is dispersed in water to produce a dispersion, and the dispersion is filled with human hair, packed, and impregnated with a foaming agent in the particles. There is no particular cation in the dispersant. For example, phosphoric acid, magnesium pyrophosphate, sodium pyrophosphate, oxidized inorganic and other insoluble inorganic substances, and foaming such as dodecyl benzoic acid surfactants are suitable. The agent 'for example, is a propylene compound, a butyl hydride, isobutane, pentane, isopentane, cyclopentane, hexane, or the like. (2) Extrusion-water cut-off method This method uses a kind of foaming polystyrene-branched tree-made grain making device. The apparatus is provided with an extruder which is provided with a die having a plurality of nozzles which are extruded in a molten resin to be linearly formed at the tip end thereof, and is provided with a foam which can press the foaming agent into the molten resin. a solvent supply line; an underwater cutting mechanism that cuts molten resin extruded from a nozzle of an extruder in circulating water, and a resin particle collecting mechanism that is transported along with the flow of circulating water The foamable polystyrene resin particles are separated from water and collected. In this method, first, the polystyrene resin as a material, and various additives added as necessary are put into an extruder, and heated and melted in an extruder at 321808 16 201035193. In the molten resin. The molten resin of the grade A is extruded into a line shape from the two molds of the mold which is attached to the tip end of the machine. The extruded surface (four) resin is immediately and recycled water, the mouth inhibits the foaming under the 'rotation of the blade, and the circulating water is in the cold=transport' and then separated by the resin particle trapping mechanism. Resin particles 'recycled water is recycled and reused ^", the secret polystyrene rhyme particles after drying, depending on = and the average particle size is 300 师 〇 〇 系 系 resin particles. 5 called the peak within the foam Sexual Polystyrene B (Production of Expandable Polystyrene-Based Resin Particles for Multi-Piece Forming) The surface of the hair-like defect in the second range is produced by the high-fat fatty acid brewing amine ': oil vinegar adhesion' The low-yield development/enveloped polystyrene-based resin particles. The manufacturing method of the present invention is used less, and the polystyrene is mixed with: a higher fatty acid guanamine and a higher-fat n-glycerin; The method of covering can be exemplified by the following three methods (1) to (3) (dry method (2) wet method-1 (3) wet method _2. Medium 'to average particle size to 2 to range polyethylene berry resin 1 〇〇 mass part of the particles, add more than 2 parts, and mix to make the higher fatty acid guanamine and sour glycerin - Foaming polystyrene resin particles are used in low-cost molding of the resin. In this case, from 0::: to 2.5 parts by mass, the high-fat fatty acid triglyceride is reversed and placed. And mixed to make the higher fatty acid amide amine and high after the 由 酯 由 由 由 , , , , , , , , , , , , , , , , , 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 17 17 2010 2010 2010 The additive of the guanamine and the higher fatty acid triglyceride may be in the form of fine particles, or may be in contact with the surface of the resin particle in a state of being dissolved or dispersed in a small amount of the organic solvent, and then the solvent may be distilled off. A small amount of binder is added together with the additive to increase the adhesion on the surface of the resin particles. According to this method, the total amount of the converted fatty acid guanamine and the higher fatty acid triglyceride will adhere to the expandable polystyrene resin. (2) In the wet method-1, a fine powder of a higher fatty acid guanamine and a higher fatty acid triglyceride are prepared by dispersing a surfactant in advance. After the aqueous dispersion of the agent is added to an aqueous dispersion of expandable polystyrene resin particles having an average particle diameter of 300 to 2,500 /zm and mixed, the mixture is dehydrated and dried to obtain a foam for molding at a low magnification. The polystyrene-based resin particles are not particularly limited, and may be appropriately selected from various surfactants such as an anionic surfactant, a cationic surfactant, and a nonionic surfactant. The use may, for example, be an alkylbenzenesulfonate or the like. In this way, about 50% of each of the higher fatty acid guanamine and the higher fatty acid triglyceride may be attached to the surface of the expandable polystyrene resin particles. (3) In the wet method-2, an aqueous dispersion of an additive is prepared by dispersing a fine powder of a higher fatty acid guanamine and a higher fatty acid triglyceride as an anionic or cationic surfactant in advance, and adding it to an average particle diameter. In an aqueous dispersion of expandable polystyrene resin particles in the range of 300 /zm to 2500 #m, and mixed, and then mixed with the above-mentioned 18 321808 2010351 93 = Surfactant The opposite nature of the surfactant is added in an amount sufficient to neutralize the amount of surfactant contained in the aqueous dispersion of the bismuth additive, thereby allowing advanced. Month day = guanamine and higher fatty acid triglycerin The anionic or cationic surfactant used herein to obtain the foamable polystyrene resin/substrate for low-fold molding is attached to the surface of the foamable polystyrene resin, and is not particularly limited. However, for example, a phthalic acid salt of an anionic surfactant, a dimethyl benzyl ammonium dimethyl amide ammonium cation, etc. of a cationic surfactant may be mentioned. According to this method, the amount of the higher fatty acid guanamine and the higher fatty acid triglyceride to be added may be attached to the surface of the foamable polystyrene resin granule by about 50%. The foamable polystyrene-based resin particles of the present invention have a foamable polystyrene-based resin particle 100 in the range of 3 〇〇 #m to 2,500 m in the average particle diameter on the surface of the particles. The mass fraction is further covered with a higher fatty acid decylamine 0.02 to 2.5 parts by mass with a higher fatty acid triglyceride 〇. 〇2 to 2.5 parts by mass. As a result, the low-expansion foaming particles obtained by foaming the foamable styrene-polystyrene-based resin particles for low-molding or the foaming polystyrene-based resin particles for molding at a low magnification are obtained at a low magnification. The low-expansion molded article obtained by in-mold foam molding has excellent fusion ratio and elongation between the expanded particles, and is excellent in bending strength and compressive strength. Therefore, the expandable polystyrene resin particles for low-molding of the present invention can be used for the production of a low-expansion molded article excellent in bending strength and compressive strength. The "average particle diameter" of the expandable polystyrene resin particles for low-molding of the present invention means a value measured by the following method. The method of measuring the average particle diameter is as follows. 321808 19 201035193

50 to 100 g of the expandable polystyrene-based resin particles are used in a low tap type sieve shaker (manufactured by Iida, Inc.), in Schedule 1, Table 2 (:is of JISZ 8801-1:2006) 〇 565: Table 1 of Table 1 and Table 2) 3 of the nominal meshes (subsidized sizes) 4 mm, 3.35 mm, 2. 8 mm, 2. 36 mm, 2 mm, l·7 mm, i. 4 mm, i. i8mni , imm, 850 aid, 710 // m, 600 ^111'500 425//in' 355//in^ 300^ m'250//m> 212 180 sieve screening i〇 minutes. The mass of the sample on the screen was measured, and based on the cumulative mass distribution curve obtained as a result, a particle diameter (median diameter) having a cumulative mass of 50% was determined as the average particle diameter. The "bulk density" of the expandable polystyrene resin particles for low-molding of the present invention is a value measured by a method for measuring the "total density" of low-expansion particles to be described later. , the low-powered hair of the present invention is obtained by heating the foamed polystyrene yarn of the low-profile molding of the present invention to a total volume, and the ratio is 2. G to 20 times. . The range of the overall expansion ratio is ideally 2.0 to 1 times, and 2 to 5 times is the opposite phase. If the overall expansion factor of the hair does not reach her, the variation of the overall expansion ratio is large, and uniform particles cannot be obtained. On the other hand, the low expansion ratio of the low-expansion particles exceeds the above-mentioned _, and the residual foamed body having excellent strength and durability is excellent. Here, the "total density" of the low-expansion particles is measured by the method. First, prepare 5〇〇cm3, [θ祥, 壮 =: bubble particles to and, "the scale is level. At this time, from the visual (four), the pre-issued as long as there is - grain up to 5 (HW's 321808 20 201035193 Scale 'At this point, the pre-expanded particles are terminated in the measuring cylinder at this time, and the mass of the pre-expanded particles packed in the measuring cylinder is planted to the money point with a valid number of = 2, and the mass is set to W (g). Then The following formula is used: The total density of the pre-expanded particles. The overall density (g/cm3) = w(g) / 500 (cm3) The "total expansion ratio" of the low-expansion particles is the aforementioned overall density. The reciprocal (1/total degree), in the case of polystyrene resin, the overall expansion ratio of the low-expansion particles of the overall density ❹〇.2g/cm3 is 5 times, and the overall density is lg. lg/cm3 The low expansion foam of the present invention is obtained by heating the foamed polystyrene resin particles for low-molding and foaming them to form an overall foaming. The multiple is in the range of I·5 to 20 times, so it can be used to produce low-expansion foaming which is excellent in bending strength and compressive strength. The low-expansion foam molded article of the present invention is formed by molding the above-mentioned low-expansion foaming cerium-acetonitrile-based resin particles or the low-expansion foamed particles in a molded cavity having a molded shape obtained by the symbol δ. In the mold cavity of the machine, it is formed by in-mold/packing. In this case, the expansion ratio is in the range of 丨5 to 2〇. The expansion ratio of the low-expansion molded body is In the range of 1.5 to 1 = = ideally, it is preferably in the range of 1.6 to 5 times. If the expansion ratio is within the range, it can be used in the Hume tube (concrete propulsion pipe). It can be used in the field of building materials such as the slabs, such as the slabs, and the floor materials, etc., and can provide a low-expansion molded body excellent in bending strength and ink shrinkage strength. The "density" of the foamed molded body is JISK6767: 1999" The test piece described in the measurement of "apparent density" is measured by the method described in the measurement of "apparent densi ty". That is, the test piece of 50 cm 3 or more (100 cm 3 or more in the case of a semi-hard and soft material) does not change the original material of the material. The cell structure is cut off and the mass is measured. g), and the following formula is calculated. Density (g / cm3) = test piece mass (g) / test piece volume (cm3). The "foaming multiple" of the foam molded body is the reciprocal of the aforementioned density (1/ Density), in the case of a polystyrene resin, the foaming ratio of the low-expansion particles of 2 g/cm 3 is 5 times, and the density is 〇. The foaming multiple of the low-expansion particles of lg//cm 3 is 10 The low-expansion foam molded article of the present invention is obtained by molding the foamable polystyrene tree or low-magnification recording material for low-fold molding in a mold (four), thereby obtaining a fusion between particles. Good rate and extensibility, curvature strength

The field of materials is applicable. Buffer material, the aforementioned low

The foaming magnification of the double-foamed molded body for the Hum tube (concrete propelling pipe) of the present invention is 15 to 1 Torr, and the strength and compressive strength are excellent, and the strength is 321808 22 201035193. Further, the shape of the cavity of the molding die attached to the foam molding machine is previously formed into a curved shape, and can be produced by foam molding in the mold. [Examples] In the following examples, the effects of the present application will be described by taking the dry method and the wet method to produce foamable polystyrene resin particles for low-molding. [1] The following Examples 1 to 14 and Comparative Examples 1 to 6 are produced on the surface of the expandable styrene-based vinyl resin particles in the case where the expandable polystyrene-based resin particles for low-order molding are produced by the dry method. Dry method: Both decyl stearate and trisodium hydroxystearate (but only in any of Comparative Examples 1 and 3) were coated to produce a foamable polystyrene for low-profile molding. Resin particles and low-expansion molded articles. In this way, the total amount of the added decylamine stearate and the triglyceryl stearate was adhered to cover the surface of the expandable polystyrene resin particles. [Example 1] The reactor was charged with 44 kg of pure water, 800 g of tertiary calcium phosphate, and 1. 7 g of sodium dodecylbenzenesulfonate. 110 g of benzoyl peroxide and 8 g of butyl peroxybenzoate in 42 kg of styrene. The reactor was sealed and warmed to 9 Torr. (: After 5 hours of reaction, the temperature was raised to i25 〇C for 1 hour, and cooling was started after 1 hour, and the temperature was cooled to normal temperature. The obtained slurry was dehydrated and dried to obtain polystyrene having an average particle diameter of 1400 #m. In a 5 liter reactor, 5 kg of pure water is charged, and the polystyrene resin particles obtained by the above method are added (average particle size 14 〇〇 # m, weight average 321808 23 201035193, molecular weight is about 300,000. 2公斤,十二含基。 The residual monomer is about 2000ppm) 2. Okg, sodium dodecyl sulfonate sodium 0. 2g, magnesium pyrophosphate 7. Og and stirred to suspend. Secondly, in the preparation of pure water 〇. 5kg, dodecyl Sodium benzene sulfonate 〇 中 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 After being kept at 120 ° C for 5 hours, it was cooled to room temperature and taken out to obtain foamable polystyrene-based resin particles. Next, the obtained foamable styrene resin particles 2. Okg was placed in a drum mixer. (tumbler mixer) (Deshou Co., Ltd., kotobuki mixwell W-20), relative 100 parts by mass of the expandable styrene resin particles, and amidoxime stearate is added. 2 parts by mass and 12 parts by mass of 12-hydroxystearic acid triglyceride are used as a covering agent, and stirred to obtain a hard fat. Foaming polystyrene resin particles for low-profile molding having a total density of 0.6 g/cm 3 covered with acid amide and 12-hydroxystearic acid triglyceride. Next, foaming for low-molding obtained by the above method The polystyrene-based resin particles were placed in a mold cavity (a mold cavity for producing a molded body of 200 mm × 150 mm × 15 mm) attached to a molding die of a molding machine (manufactured by Sekisui Kogyo Co., Ltd.). 〇8MPa of water vapor is heated for 35 seconds, and cooled to obtain a low-expansion molded body having a density of 〇·6g/cm3, a foaming multiple of 1.7 times, and a size of 200mm×l50mm×l5mm. The foamed molded body is used to perform the following tests and evaluations. The results are shown in Table 1. 〇 &lt;fusion ratio&gt; Firstly, on any surface of the low-expansion molded body, a cutting line of 24 321808 201035193 depth ι· is formed with a knife, along which the hand or hammer is cut. The low-expansion foam molded body is divided into two halves. In the arbitrary 100 to 150 expanded particles exposed in the fractured section of the low-expansion molded body, the number of particles broken in the expanded particles (a)' and the thermal fusion between the expanded particles are counted. The number of particles broken at the interface (b), the fusion ratio of the low-expansion molded body is different by the following formula. 'The fusion ratio (%) of the foamed molded body = 100x number of particles (a) / (number of particles) Number (b)) The fusion rate is above 70% as qualified, and less than 7〇% is considered unqualified. 〇<Extension> Observe the surface of the low-expansion molded body, and count the number of foamed particles (a) in the range of 3〇mmx3〇min without the trace of the core venting hole (core vent), and There are at least three or more foamed particles surrounded by the gaps between the foamed particles (slightly polygonal shape), and the distance between the gaps is less than 5 coffees (b), which is calculated by the following formula The void ratio of the double-foamed molded body and the elongation were classified into five-stage evaluation. Then, those who have evaluated "4" or more are qualified as ❹, and those who have evaluated "3" or less are not qualified as extensions. Void ratio (%) = b/axl00. 5: There is no void between the particles (void ratio 0%). 4: The void ratio exceeds 0% and does not reach 5%. 3: The void ratio is more than 5% and less than 20%. 2: The void ratio is more than 20% and less than 40%. The amount of the content of the amount of the sulphate is 0. 0.3 parts by mass. In the same manner as in the example 1 of the present invention, the foamable polystyrene resin particles and the low-expansion foam molded article for low-molding were produced, and the same test and evaluation as in Example 1 were carried out. The results are shown in Table 1. [Example 3] The production of the foamable polystyrene resin particles for low-molding was carried out in the same manner as in Example 1 except that the amount of the decylamine stearate used was 0.05 parts by mass. The foaming polystyrene resin particles for molding and the low-expansion foam molded body were subjected to the same test and evaluation as in Example 1. The results are shown in Table 1. [Example 4] The same operation as in Example 1 except that the amount of the decylamine amide was used in the production of the foaming polystyrene resin particles for low-molding. In the same manner as in Example 1, the same test and evaluation as in Example 1 were carried out to produce foamable polystyrene resin particles and low-magnification foam molded articles for low-order molding. The results are shown in Table 1. [Example 5] The same operation as in Example 1 except that the amount of the stearic acid to be used was changed to 0. 10 parts by mass. The foaming polystyrene-based resin particles and the low-expansion foam molded article for low-profile molding were produced, and the same test and evaluation as in Example 1 were carried out. The results are shown in Table 1. [Example 6] The same applies to the production of the foamable polystyrene resin particles for low-molding, except that the amount of the decylamine stearate used is 0.20 parts by mass, as in the case of the actual example 26 321808 201035193. The foaming polystyrene-based resin particles and the low-expansion foam molded article for low-molding were produced by the operation, and the same test and evaluation as in Example 1 were carried out. The results are shown in Table 1. [Example 7] The same operation as in Example 1 except that the amount of the decylamine succinate used was changed to 0.30 parts by mass. The foaming polystyrene-based resin particles and the low-expansion foam molded article for low-profile molding were produced, and the same test and evaluation as in Example 1 were carried out. The results are shown in Table 1. [Example 8] The production of the foamable polystyrene resin particles for low-molding was carried out in the same manner as in Example 1 except that the amount of the decylamine stearate used was 0.40 parts by mass. The foaming polystyrene-based resin particles and the low-expansion foam molded article for molding were subjected to the same test and evaluation as in Example 1. The results are shown in Table 1. 。 [Example 9] The amount of the styrene stearate used in the production of the foaming polystyrene resin particles for the low-molding was set to 0. 10 parts by mass, 12-hydroxystearic acid triglyceride The foaming polystyrene resin particles and the low-expansion foam molded article for low-molding were produced in the same manner as in Example 1 except that the amount of the addition was 0.02 parts by mass, and the same test as in Example 1 was carried out. Evaluation. The results are not in Table 1. [Example 10] In the production of foamable polystyrene resin particles for low-molding, in addition to 27 321808 201035193, the amount of decylamine stearate used was determined to be 1 part by mass, 12-base stearic acid. The amount of triglycerin added is U4 parts by mass, and the examples are! The foaming polystyrene resin particles for low-fold molding and the low-expansion molding were produced in the same manner, and the same test and evaluation as in Example 1 were carried out. The results are not in Table 1. [Example 11] In the production of the foamable polystyrene-based resin particles for molding at a low magnification, the amount of the decylamine stearate used was set to 1 part by mass, and the triglyceride of 12-based stearic acid was used. In the same manner as in the example of the fish, the foaming polystyrene resin particles and the low-expansion foam molded article for low-molding were produced in the same manner as in the case of the above-mentioned mass. Evaluation. The results are shown in Table 1. [Example 12] In the production of (4) material for the low-magnification molding, in addition to the amount of decyl stearate used, the amount of decyl stearate added was 〇1 〇 by mass, and the amount of stearic acid triglyceride (iv) was added as The same test and evaluation as in Example i were carried out except that the foamed polystyrene resin particles and the low-foam molded article for low-molding were produced in the same manner as in Example 以外 except for the G2G f component. The results are not in Table 1. [Example 13] In the production of the foamable polystyrene-based resin particles for low-molding, the amount of the guanylamine stearate added was set to be Q1Q parts by mass, and the amount of tris-hydroxystearic acid triglyceride was added. In the case of 0. 〇 6 parts by mass, the plaque Example 1 is the same operation as the weibu forming_foaming polystyrene resin pellet 321S08 28 201035193. The obtained expandable polystyrene-based resin particles for low-molding are heated in a batch type foaming machine at a temperature of about 95° C., and are previously foamed to have an overall density of 0·2 g/cm 3 and an overall expansion ratio. 5 times. The pre-expanded particles were allowed to stand at room temperature for about 1 day, and after they were aged, the pre-expanded particles were placed in a cavity (200 mm x 150 mm x 15 mm) of a molding machine, heated in water vapor of 0.08 MPa for 35 seconds, and cooled. A low-expansion molded body having a density of 0.2 g/cm3, a foaming multiple of 5 times, and a size of 200 mm x 150 mm x 15 mm was obtained. This low-foamed molded article was evaluated in the same manner as in Example 1. The results are shown in Table 1.实施 [Example 14] In the production of the expandable polystyrene-based resin particles for low-molding, the amount of the decylamine stearate used was set to 10 parts by mass, 12-hydroxystearic acid triglyceride. The foaming polystyrene resin particles for low-profile molding were produced in the same manner as in Example 1 except that the amount of addition was changed to 0.06 parts by mass. The obtained low-expansion molding expandable polystyrene resin particles are heated in a batch type foaming machine 'water vapor at about 95 ° C, and are previously foamed to have an overall Q density 〇· lg/cm 3 and overall foaming. The multiple is 1〇. The pre-expanded particles were allowed to stand at room temperature for about 1 day, and after they were aged, the pre-expanded particles were placed in a cavity (200 mm×l 50 mm×l 5 mm) of a molding machine, and heated by steam at 0.08 MPa for 35 seconds to cool. A low-expansion molded body having a density 〇. lg/cm3, a foaming multiple of 1〇, and a size of 200 mm×l50 mm×l5nim. This low-expansion molded article was evaluated in the same manner as in Example 1. The results are shown in Table 1. [Example 15] The average particle diameter of the polystyrene resin particles used in the production of the expandable polystyrene resin particles for low-molding was set to 800 / / m, and hard 29 321808 201035193 In the same manner as in Example 1, except that the amount of addition of the mono-stearic acid triglyceride was 0. 5 parts by mass, the foaming property of the low-molding molding was determined to be 1 part by mass. The resin particles and the low-expansion foam molded body were subjected to the same test and evaluation as in Example 1. The results are shown in Table [Example 16] In the production of the expandable polystyrene resin particles for low-molding, in addition to the amount of the hard-reduced amine used, 1.5 parts by mass, 12-base hard fat In the same manner as in Example 1, except that the amount of the acid triglycerin was 1.5 parts by mass, the foaming polystyrene resin particles and the low-foamed molded article of the low-molding molding were carried out. The same test and evaluation. The results are shown in Table 1. [Comparative Example 1] In addition to the additive used, in the production of the forming hair &gt; the polystyrene resin particles, only the 12-hydroxystearic acid triglycerin was added. In the same manner as in the first example, the foaming polystyrene resin particles and the low-expansion foam molding were tested in the same manner as in the first example, except that the esters were temporarily θ, the goods, and the wounds were purchased. Evaluation. The results are shown in Table [Comparative Example 2] In the production of the expandable polystyrene-based resin particles for the molding of the molding, the addition amount of the succinic acid stearic acid was used in addition to the amount of 〇·01 parts by mass. The same procedure as in Example 1 was carried out to prepare (4); the Ethylene tree and the low-expansion foam molded body were subjected to the same test and evaluation as in Example 1. The results are shown in Table 1. [Comparative Example 3] 321808 30 201035193 In the production of the expandable polystyrene resin particles for low-molding, only 10 parts by mass of amidoxime stearate was added in addition to the additive used, and 12-hydroxystearic acid was not added. In the same manner as in Example 1, except for the triglyceride, the foamable polystyrene resin particles and the low-expansion molded article for low-molding were produced, and the same test and evaluation as in Example 1 were carried out. The results are shown in Table 丄. [Comparative Example 4] In the production of the expandable polystyrene resin particles for low-molding, the amount of the decylamine stearate used was set to be 1 part by mass, 12-hydroxystilbene stearic acid. In the same manner as in Example 1, except that the amount of the glyceride was changed to 0. 01 parts by mass, the foamable polystyrene resin particles and the low-expansion molded article for low-molding were produced, and the examples were carried out. The same test and evaluation. The results are shown in Table 1. [Comparative Example 5] The amount of the stearic acid decylamine added in the production of the expandable polystyrene resin particles for low-molding was determined to be 〇. 1 〇 quality: parts by weight, and added by hard The same procedure as in Example 1 was carried out except that zinc bisphosphate was used in an amount of 0.16 parts by mass in place of 12% by weight of stearic acid triglyceride, and a low-weight molding foamed polystyrene chain and a low-powered body were produced. The same test and evaluation as in Example i were carried out. The results are shown in Table 丨. [Comparative Example 6] In addition to the additive used in the production of the expandable polystyrene-baked resin particles for low-molding, the amount of the ethyl bis-stearic acid amide was changed to 1 part by mass, 12-based. Stearic acid triglycerin § Q G6 parts by mass in place of stearic acid, and the same operation as in Example 1 to produce foamable polystyrene 321808 201035193 olefin resin particles and low-expansion foam molded body The same test and evaluation as in Example 1 were carried out. The results are shown in Table 1. [Comparative Example 7] The amount of the stearic acid decylamine to be used in the production of the foaming polystyrene resin particles for low-molding was set to 3.0 parts by mass, 12-hydroxystearic acid triglyceride. In the same manner as in Example 1, except that the amount of the foaming polystyrene-based resin particles and the low-expansion foam molded article for low-molding were produced in the same manner as in Example 1, the same amount as in Example 1 was carried out, and the same procedure as in Example 1 was carried out. Test, evaluation. The results are shown in Table 1. 32 321808 201035193 [Table 1] ο 〇Extension LT5 LO LO LO in LO 1Λ LO LO LT3 LT5 LO LO LQ CSI CO C^I LQ CO Fusion rate [%] LO § in σ> 95 or more 95 or more 95 or more 95 95 or more 95 or more 95 or more 95 or more 95 or more 95 or more | 95 or more LO 00 〇〇〇〇 95 or more 95 or more § C5 § Covering amount [parts by mass] CD Ο Ο to 〇〇CD ο ο g 〇CD 〇&lt ;ZD ς〇c? ο CO Ο CO 〇〇* ο 〇* Ο ^―( Ο 〇g 〇g Ο g 〇S 1—Η g 〇to G3 r—Η «=&gt; (ZS CO ο c&gt; CO Ο C&gt; ο ο CO Compound name 12-hydroxystearic acid triglyceride 12-hydroxystearic acid triglyceride 12-hydroxystearic acid triglyceride 12-hydroxystearic acid triglyceride 12-hydroxystearic acid Triglyceride 12-hydroxystearic acid triglyceride 12-hydroxystearic acid triglyceride 12-hydroxystearic acid triglyceride 12-hydroxystearic acid triglyceride 12-hydroxystearic acid triglyceride 12- Trihydroxyglyceryl hydroxystearate 12-hydroxystearic acid triglyceride 12-hydroxystearic acid triglyceride 1 12-hydroxystearic acid triglyceride 12-hydroxystearic acid triglyceride 12-hydroxyl Triglyceride stearate 12-hydroxystearic acid triglyceride 12-hydroxystearic acid triglyceride 12-hydroxystearic acid triglyceride hard fatty acid zinc 12-hydroxystearic acid triglyceride 12-hydroxystearyl Acid triglyceride coverage [parts by mass] 〇S 〇m ο ο 〇Ο Ο 〇* 〇* 〇»—Η Ο 1*··4 Ο 〇1~Η C5 〇〇〇1—&lt;C? 〇〇 〇S Carbon^^4 Ο 〇〇C5 ο ο 〇Ο 〇〇CO Compound name Stearic acid Stearic acid stearic acid amide amine stearic acid amide amine stearic acid amide amine stearic acid amide amine stearic acid amide脂 醯 硬 硬 硬 硬 硬 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Stearing ratio of stearylamine stearate stearate stearate stearate stearate stearate stearate ethyl bis-stearate sulphate stearic acid sulphate sulphate [multiples] 卜τ-Η Bu Bu Τ -Η卜1—(卜卜Η卜卜卜卜 T—^ 〇LO 卜 C—F—^ Bu 1—^ Bu 1— Bu—1 Bu T—Η BuΤ-Η Bu Bu average particle size [&quot ;m] 1400 1400 1400 1400 1400 1400 1 400 1400 1400 1400 1400 1400 1400 1400 ____1 〇§ 1400. 1400 1400 1400 1400 1400 1400 1400 Example 1 CSI CO LO CO 〇〇 05 CD (M τ*** &lt; CO t-Η LD CO Comparative Example 1 CN1 CO ΙΓ5 CO 卜 33 321808 201035193 From the results of Table 1, it is understood that the surface of the foamable polystyrene-based resin particles is used, and 100 parts by mass of the resin particles are used, and the high-fat (four) axis is used in an amount of 0.02 to 2.5 parts by mass and the higher fatty acid is used. (10) to 2 parts by mass of a low-expansion molding foamed polystyrene-based resin particle coated with a low-molding molding, a low-expansion molded body of the present invention 丨 to ι6, straight-melt joint In 7 'extensibility evaluations are in 4 to 5, while having excellent strength and durability. On the other hand, in the comparative example i' which was not covered with decyl stearate and only covered with 12, stearic acid triglycerin vinegar 0, the low-foamed molded article had a poor fusion rate, and was not sufficiently obtained. A shaped body of strength. Further, in Comparative Example 2' in which the amount of coverage of stearic acid-bromide was ui parts by mass and the range of the present invention was not satisfactory, the molded article of the low-expansion molded article was inferior, and a molded article having sufficient strength could not be obtained. Further, in Comparative Example 3, which was not coated with tris-glyceryl stearate, the blending ratio was good, but the elongation of the expanded particles was "% in the 5-class evaluation, and between the expanded particles. The number of gaps is very large and the appearance is poor, and a molded body having sufficient strength cannot be obtained. The coverage of glycerin § is set as Comparative Example 4 of G.G1 mass dry garden, and the elongation of the expanded particles is 5 steps. ^ § I 3" of the flattening order is not good, the number of gaps between the foamed particles is large and the appearance is unworthy, and, in addition, there is a molded body having sufficient strength. In the case of replacing the 12-hydroxystearic acid triglyceride and covering it with stearic acid, the fusion ratio and the elongation of the low-expansion molded article of Example 5 are both poor and the molded body having sufficient strength is obtained. 34 321808 201035193 Further, in Comparative Example 6 in which decyl ethyl bis-stearate was used instead of decyl stearate, the evaluation of the elongation was good, but the fusion rate was not good, and sufficient strength was not obtained. body. Further, the coating amount of the decylamine stearate was 3.0 parts by mass, and the coating amount of the 12-hydroxystearic acid diglyceride was 3.0 parts by mass, which exceeded the range of the present invention, and the low-expansion foam molded body The fusion rate is poor, and the elongation of the expanded particles is also poor in "3" in the five-class evaluation. The number of gaps between the expanded particles is large and the appearance is poor, and a molded body having sufficient strength cannot be obtained. [2] The following Examples 15 to 21 and Comparative Examples 7 to 9 are produced on the surface of the expandable styrene resin particles when the foamable polystyrene resin particles for low-order molding are produced by a wet method. A low-profile molding was prepared by coating a wet method with both decyl stearate and trisodium hydroxystearate (but, in Comparative Example 7, only 12-hydroxystearic acid triglyceride) Expandable polystyrene resin particles and low-expansion molded articles. In this way, the stearic acid-addition amine and the 12-hydroxystearic acid triglyceride are each attached in an amount of about 50%, and the crucible is coated on the surface of the expandable polystyrene-based resin particles. [Example 17] (Preparation of the additive aqueous dispersion) 300 mL of water was placed in a 500 mL beaker, and the content of the stearic acid decylamine 0·04 was added to 100 parts by mass of the foamable polystyrene resin particles to be used later. And an aqueous dispersion of the additive was prepared by dispersing the mixture with 12-hydroxystearic acid triglyceride 0.12 parts by mass with sodium dodecylbenzene hydride. 005 parts by mass in a blender. (Preparation of foamable polystyrene resin particles for low-molding) Next, the foamable polystyrene 35 321808 201035193 resin particles obtained in Example 1 was added to a 2 L beaker] (1) 匕• ukg and water 650 mL, and then The aforementioned additive aqueous dispersion was added to assemble a right ' /fu + $ 4 piece of 6 cm diameter down pellet mixer, and 5 minutes + J. at 650 rpm. Next, it was dehydrated and dried to obtain a low-density j-shaped foaming polystyrene resin particle having an overall density of 66 g/cm3.倍倍尺寸, The size of the foam is 1. 7 times, the size is 1. 7 times, the size is 1. 7 times, the size is 1. 7 times, the size is 1. 200mmxl50mmxl5imn low-paying body. The same test and evaluation as in Example 1 were carried out on the obtained low-expansion molded product. The results are shown in Table 2. [Example 18] The foaming property of the low-molding molding was carried out in the same manner as in Example 15 except that the amount of the decylamine amide added to the aqueous dispersion of the additive was changed to G.06 parts by mass. The polystyrene-based resin particles and the low-expansion foam molded body were subjected to the same test and evaluation as in Example 1. The results are shown in Table 2. [Example 19] Except that the addition amount to the aforementioned addition of the water-soil dispersion was determined to be a portion, the same as the example == == polystyrene-particles and low-fold foaming = [the same amount of money, evaluation . The results are shown in the table: the amount of the additive aqueous dispersion added is 0.20 parts by mass, and the amount of 12, stearic acid day = amine is gamma parts, and the foaming polyg of the molding is used. Stupid Espresso particles and low magnification ^ 21808 36 201035193. The results are shown in Table 2. [Example 21]

The foaming polystyrene-based resin particles for molding at a low magnification were obtained in the same manner as in the same manner as in Example 15 except for 12-hydroxystearic acid triglycerin. The obtained low-fold-foaming polystyrene-based resin particles were produced in batches of about 95. (3) Water hearing (9), pre-expanded to an overall density of 0.2 g/cm3 and an overall foaming ratio of 5 times. After the pre-formed/packaged particles were allowed to stand at room temperature for about 1 day, the pre-expanded particles were filled in the same test as in Example 1 to evaluate the L肀' added stearic acid decylamine 0. 20 vinegar. 12 The mass part is prepared to be entangled in the mold cavity of the molding machine (200 mm x 150 mm x 15 mm), heated by water 蒸 j 8j|{Pa for 35 seconds, and cooled to obtain a density of 〇 2 g/cm 3 , a foaming multiple of 5 times, a size 200 mm x 150 mm x 15 mm low expansion foam molded body. The same test and evaluation as in Example 1 were carried out for this low-expansion molded article'. Table 2 shows the results. [Example 23] The same procedure as in Example 15 except that the aqueous dispersion of the additive was prepared in an amount of 2.0 parts by mass of stearic acid decylamine and 12 parts by mass of 12-hydroxystearic acid triglyceride. In the step, foamable polystyrene resin particles for molding at a low magnification are obtained. The lg/cm3, overall, the total density is 0. lg / cm3, the whole is pre-expanded to a total density of 0. lg / cm3, the total amount of foamed polystyrene resin 321808 37 201035193 particles in a batch type foaming machine, heated at a water temperature of about 95 ° C, pre-expanded to a total density of 0. lg / cm3, overall The expansion ratio is 10 times. After the pre-expanded particles were allowed to stand at room temperature for about 1 day, the pre-expanded particles were placed in a cavity (200 mm x 150 mm x 15 mm) of a molding machine, heated in water vapor of 0 〇 8 MPa for 35 seconds, and cooled to obtain a density. 0. lg/cm3, a foaming multiple of 1 inch, and a low-expansion molded body having a size of 200 mm x 150 mm x 15 mm. The same test and evaluation as in Example 1 were carried out for this low-expansion molded article. The results are shown in Table 2. [Comparative Example 8] The preparation of the aqueous dispersion of the additive was carried out in the same manner as in Example 15 except that 12 parts by mass of 12-hydroxystearic acid triglyceride was added without adding decylamine stearate. The foaming polyphenylene styrene resin particles and the low-magnification foaming body at the time of low-magnification molding were subjected to the same test and evaluation as those of the actual one. The results are shown in Table 2. [Comparative Example 9] - In the preparation of the addition of the disperse (4) 'In addition to the addition of the hard nicotine = 0.2 parts by mass, the same operation as in Example 15 was carried out, and the low-yield foaming property was made. The same test and correction as in Example 1 were carried out for the tree and the low-expansion molded body. The results are shown in Table 2. [Comparative Example 10] In addition to the addition of stearic acid to the aqueous dispersion of I to the top 1 additive aqueous dispersion: 1 part, 12-hydroxyl stearate triglyceride was added in an amount lower than f, and prepared in the same manner as in Example 15 to produce (four) secret polyphenyl "_record and low magnification The same test and evaluation as in Example 1 were carried out by foam molding 321808 38 201035193. The results are shown in Table 2.

39 321808 201035193 When the foamed polystyrene resin for low-profile molding is produced by the wet method of [2] from the results of Table 2, the low-expansion foaming of the sample 17 S 23 is the same as in the case of the (1) dry method. Any one of the bodies, the fusion rate is above %, and the elongation is evaluated from 4 to 5, with excellent (four) degrees and durability. On the other hand, in Comparative Example 8 which was not covered with decyl stearate and covered only with 0.06 parts by mass of tris-glyceryl stearate, the fusion ratio of the low-expansion molded article was poor, and it was not sufficiently obtained. A shaped body of strength. Further, in Comparative Example 9 in which the coverage of the decylamine stearate did not reach the range of the present invention, the fusion ratio of the low-foamed molded article was poor, and a molded article having sufficient strength could not be obtained. Further, in Comparative Example 10 in which the coverage of '12-hydroxystearic acid triglyceride was less than the range of the present invention, the elongation of the expanded particles was evaluated as "3" in the five-stage, and the number of gaps between the expanded particles was not good. There are many cases in which the appearance is poor, and a molded body having sufficient strength cannot be obtained. [Industrial Applicability] The foamable polystyrene resin particles for low-molding according to the present invention can be produced between the hair/package particles of the low-expansion molded body obtained by foam molding in the mold. A low-expansion molded body having a high fusion ratio, excellent elongation between expanded particles, and high bending strength and compressive strength. The low-expansion foaming of the present invention can be suitably used in the field of civil engineering such as a buffer material for a hum tube (concrete propulsion pipe), a building material field such as a floor substrate, and the like. This &amp; Ming Hume tube cushioning material can be used as a buffer material for the Hum tube (concrete push tube). 40 321808 201035193 [Simple description of the diagram] None [Main component symbol description]

Claims (1)

201035193 VII. Patent application scope: 1 · A foaming polystyrene resin particle for low-profile molding, which is characterized by a polystyrene resin containing a foaming agent and having an average particle diameter of 300 100 m parts by weight of the expandable polystyrene resin particles in the range of from m to 2,500, and in combination with higher fatty acid amidoxime 〇 2 to 2.5 parts by mass with higher fatty acid triglycerin 〇 〇 2 to 2 · 5 parts by mass to cover the surface of the particles. 2至20倍。 The low-expansion foaming poly-vinyl ruthenium resin particles according to the above-mentioned application The scope of the composition. (3) A low-expansion foamed molded article is the low-expansion foaming polystyrene resin particle described in the above-mentioned claim, or the low-expansion foam described in the second application of the patent application. 5至二十倍的范围内。 The granules are placed in a mold having a molding machine that conforms to the shape of the formed shape, and the foaming ratio is in the range of 1.5 to 20 times. And the foaming ratio of the low-expansion molded body of the present invention is in the range of 1.5 to 20 times. 5. A method for producing a foamable polystyrene resin particle for low-profile molding, which is used for producing a foaming property of the low-profile molding I ethyl ruthenium resin particle described in the above-mentioned claim i. The method is a mass fraction of foamable polystyrene resin particles which are formed by a polystyrene resin containing a foaming agent and having an average particle diameter of from 3 〇〇#m to 2500 #m. 'Add and mix higher fatty acid decylamine 0. 02 to 2.5 parts by mass with higher fatty acid triglyceride 0.02 to 2. 5 parts by mass, and make high fat 321808 42 201035193 fatty acid decylamine and higher fatty acid triglyceride attached to The surface of the expandable polystyrene resin particles. 6. A method for producing a foamable polystyrene resin particle for molding a low-power molding, which comprises dispersing an additive obtained by dispersing a fine powder of a higher fatty acid guanamine and a higher fatty acid triglyceride in a surfactant in advance. The liquid is added to an aqueous dispersion of expandable polystyrene resin particles having a mean particle diameter of from 300 /zm to 2,500 /zm, and is mixed with a polystyrene resin containing a foaming agent. After that, the method of dehydrating and drying is used to obtain the low-molding expandable polystyrene-based resin particles according to the first aspect of the patent application. 7. A method for producing a foamable polystyrene resin particle for molding a low-power molding, which comprises dispersing a fine powder of a higher fatty acid guanamine and a higher fatty acid triglycerin S with an anionic or cationic surfactant in advance. The additive aqueous dispersion is added to the water of the Q-bubble polystyrene resin particles which are formed of a polystyrene resin containing a foaming agent and have an average particle diameter of from 300 /zm to 2500 /zm. Mixing in the dispersion, and then adding a surfactant having the opposite property to the above surfactant in the mixed dispersion, the amount of which is sufficient to neutralize the amount of the surfactant contained in the aqueous dispersion of the additive, so as to be advanced The method of producing the low-temperature molding expandable polystyrene-based resin particles according to the first aspect of the invention is the method of the method of producing the low-temperature molding expandable polystyrene resin particles according to the first aspect of the invention. The fatty acid decylamine and the higher fatty acid triglyceride are adhered to the surface of the expandable polystyrene resin particles. 8. The method for producing a low-expansion foam molded article, which is the foamable polystyrene resin particle for low-molding described in the first aspect of the patent application, or the second item of the patent application scope of 43 321 808 201035193 5至二十倍的范围内。 The low-expansion of the foaming particles in the mold having a mold cavity of the shape of the shape of the mold is formed in the mold cavity, and the foaming ratio is in the range of 1.5 to 20 times. A method for producing a cushioning material for a Hum tube, which is characterized in that the expansion ratio of the low-expansion molded article according to claim 8 is 1.5 to 10 times. 321808 201035193 III. The present invention provides e^andable polystyrene type resin pellets for foammg with low expansion ratio consisting of polystyrene type resin contains a foaming agent. These pellets are characterized by coating pellets of the polystyrene type resin with 0.02 — 2.5 parts by mass of higher fatty acid amides and 0.02 — 2.5 parts by mass of higher fatty acid triglyceride toward 100 parts by mass of the pellets. further, an average diameter of these pellets is 300 - 2500 μεη. Pellets foamed with low expansion ratio which are obtained by foaming the expandable polystjrrene type resin pellets with low expansion ratio and an expanded form foamed with low e^ansion ratio which are obtained by foaming the expanded pellets in a mold. Expandable polystyrene type resin pellets for foaming with low e^ansion ratio which provides expanded pellets which can fusi The expandable polystyrene type resin peUets for foaming with low expansion ratio of the present invention are suitable for producing the expanded form having high bending strength and hieh compressive Strength. IV. Designated representative map: There is no schema in this case. (1) The representative representative figure of this case is: (). (2) The representative of this representative®|is a list of explanations: 5. If there is a chemical formula in this case, A h _ shouting _ hair 8 characteristic chemical formula This case is not represented by chemical formula 321808 2 201035193 Patent application No. 99104946 (June 21, 1999) (Japanese) * In addition, Comparative Example 6 which was covered with ethyl bis-stearate in place of stearic acid and amine was excellent in elongation, but the fusion rate was not good, and sufficient strength could not be obtained. body. Further, the coating amount of decylamine stearate was 3.0 parts by mass, and the amount of the stearic acid triglyceride was 3.0 parts by mass, and the comparative example 7 exceeding the range of the present invention, the low-expansion foam molding The fusion rate of the body is poor, and the elongation of the expanded particles is also poor in "3" in the five-stage evaluation. The number of gaps between the expanded particles is large and the appearance is poor, and a molded body having sufficient strength cannot be obtained. [2] The following Examples 15 to 21 and Comparative Examples 7 to 9 were produced on the surface of the foamable ethyl ruthenium resin particles when the foamable polystyrene resin particles for low-profile molding were produced by a wet method. 'The wet method was used to cover both stearic acid and trisodium hydroxystearate (however, in Comparative Example 7, only 12-hydroxystearic acid triglyceride) was used to produce low-profile forming hair. Foaming polystyrene resin particles and low-expansion molded articles. In this way, the added decylamine stearate and the triglyceride 12-hydroxystearic acid are each attached in an amount of about 5% by weight, and the ruthenium is coated on the surface of the foamable polystyrene-based resin particles. [Example 17] (Preparation of the additive aqueous dispersion) 3 mL of water was placed in a 500 mL beaker, and amide amine stearate was added to 100 parts by mass of the expandable polystyrene resin particles to be used later. 〇 2 parts by mass and 6 parts by mass of 12-hydroxystearic acid triglyceride 〇·〇 and 0.005 parts by mass of sodium dodecylbenzenesulfonate were dispersed in a stirrer to prepare an aqueous dispersion of the additive. (Preparation of foamable polystyrene resin particles for low-molding) Next, the foamable polystyrene 321808 modified version 35 201035193 obtained in Example 1 was added to a 2 L beaker. Patent Application No. 99104946 (99-year-old patent application) 21st) Resin particles 1. Okg and water 650mL, and the above additive aqueous dispersion was further added to assemble four mixers having a diameter of 6 cm to the lower pulp sheet, and stirred at 65 rpm for 5 minutes. Next, it is dehydrated and dried to obtain foaming polystyrene resin particles for molding at a low overall density. The foamed polystyrene resin particles for low-molding which were produced by the above-mentioned method were used as a material, and were molded by foaming in the same manner as in Example i to obtain a density of 〇·6 g/cm 3 and a foaming multiple h of 7 times. Low-expansion foam molded body of dirty size i5〇mraxi5flim. The same test and evaluation of the fish example 1 were carried out on the obtained low-expansion molded product. The results are shown in Table 2. [Example 18] The low-strength of the hard woven amine to be added to the aqueous dispersion was added and the body was processed in the same manner as in Example 15 (IV), and the solid 丨 resin particles and the low-expansion foam molding were carried out [Example 19] (4) Inspection and evaluation. The results are shown in Table 2. Adding amount Q \ Additives The aqueous dispersion of guanamine added by the additive is 〇. 05 晋 份 造 造 造 造 造 造 造 造 造 造 造 造 造 造 造 造 造 造 造 造 造 造 造 造 造 造 造 造 造 造 造 造 造 造 造^Example^ Polystyrene-based resin particles and low-expansion foaming addition amount ^ is the amount of decyl stearate added by Qf water-dispersed lysine as 0.02 mass to =12~ trans-base hard-fat acid triglyceride In the same manner as in the fifteenth embodiment, the foaming polyphenylene phthalate was produced in the same manner as in the fifteenth embodiment, and the low-twisted resin particles and the low-expansion foam molded body were produced, and the 321808 modified version 36 patent application No. 99104946 (June 99) 21曰) The results are shown in Table 2. 201035193 &quot;The same test and evaluation as in Example 1. [Example 21] The addition of the stearic acid decylamine added to the aqueous dispersion of the additive is as follows. In the same manner as in Example 15, except that the amount of the stearic acid triglyceride added was 0.03 parts by mass, the low L formation = the foamable polystyrene resin particles and the low The foamed molded article was subjected to the same test and evaluation as in Example 1. The results are shown in Table 2. [Example 2 2] ^ The same procedure as in Example 15 was carried out except that 0.10 parts by mass of decylamine stearate and 6 parts by mass of 12-hydroxystearic acid tristearate were added to the aqueous dispersion of the additive additive. Foaming polystyrene-based resin particles for molding. The obtained foamable polystyrene-based resin particles for molding at a low magnification are heated at a temperature of about 95% by a batch type foaming machine. In general, the degree is 0. 2g/cm3, and the overall expansion ratio is 5 times. After the pre-expanded particles are allowed to stand at room temperature for about 1 day, the pre-expanded particles are loaded into the cavity of the molding machine (200 mm x 150 mm x 15 min). The low-expansion foamed body having a density of 0.2 g/cm 3 , a foaming multiple of 5 times, and a size of 200 mm×l 50 mm×l 5 mm was obtained by heating 水 8 MPa of water vapor for 35 seconds and cooling. Example 1 The same test and evaluation. The results are shown in Table 2. [Example 23] In the preparation of the aqueous dispersion of the additive, in addition to the addition of decyl stearate 0. 10 parts by mass and 12-hydroxystearic acid triglyceride 0 6 parts by mass and prepared in the same manner as in Example 15 Expandable polystyrene-based resin particles for molding. The obtained foamable polystyrene resin for low-profile molding 37 321808 Rev. 201035193 Patent No. 99104946 (June 21, 1999) Particles in batches The secondary foaming machine is heated at a temperature of about 95° C., and is pre-expanded to a total density of 0.1 g/cm 3 and an overall expansion ratio of 10 times. The pre-expanded particles are allowed to stand at room temperature for about 1 day. After that, the pre-expanded particles are filled in a mold cavity of a molding machine (200 mm x 150 mm x 15 mm), heated with water vapor of 0.08 MPa for 35 seconds, and cooled to obtain a density of 0.1 g/cm3, a foaming multiple of 10 times, and a size of 200 mm x 150 mm x 15 mm. Double foam molded body. The same test and evaluation as in Example 1 were carried out for this low-expansion molded article. The results are shown in Table 2. [Comparative Example 8] In the same manner as in Example 15, except that the aqueous dispersion of the additive was prepared, the addition of 12-light stearic acid triglyceride was carried out without adding stearic acid decylamine. In the same manner, the same test and evaluation as in Example 制造 were carried out to produce a foamable polystyrene type resin, a resin particle, and a low-expansion molded body for low-molding. The results are shown in Table 2. [Comparative Example 9] In the preparation of the aqueous dispersion of the additive, the foaming polycondensation for low-profile molding was produced in the same manner as in Example 15 except that the addition of decylamine citrate was set to 0.01 parts by mass. The styrene-based resin particles and the low-expansion foam molded article were analyzed in the same manner as in Example 1, and (4). The results are shown in Table 2. [Comparative Example 10] In the preparation of the aqueous dispersion of the additive, in addition to the addition of decyl stearate to 10 parts by mass, the amount of 12-based stearic acid triglyceride was determined to be 〇·01 In the same manner as in Example 15, except that the preparation was carried out in the same manner as in Example 15, the foamed polystyrene resin particles for low-fold molding and the low-foam molding 38 321808 modified version were produced.