KR101577957B1 - Surface-treated foamed polystyrene polymer composition in plasma - Google Patents
Surface-treated foamed polystyrene polymer composition in plasma Download PDFInfo
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- KR101577957B1 KR101577957B1 KR1020150050083A KR20150050083A KR101577957B1 KR 101577957 B1 KR101577957 B1 KR 101577957B1 KR 1020150050083 A KR1020150050083 A KR 1020150050083A KR 20150050083 A KR20150050083 A KR 20150050083A KR 101577957 B1 KR101577957 B1 KR 101577957B1
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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
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/12—Chemical modification
- C08J7/16—Chemical modification with polymerisable compounds
- C08J7/18—Chemical modification with polymerisable compounds using wave energy or particle radiation
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- C08J7/045—
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/22—After-treatment of expandable particles; Forming foamed products
- C08J9/228—Forming foamed products
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- C08K3/0058—
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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
- C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
- C08L25/02—Homopolymers or copolymers of hydrocarbons
- C08L25/04—Homopolymers or copolymers of styrene
- C08L25/06—Polystyrene
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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
- C08L2666/00—Composition of polymers characterized by a further compound in the blend, being organic macromolecular compounds, natural resins, waxes or and bituminous materials, non-macromolecular organic substances, inorganic substances or characterized by their function in the composition
- C08L2666/66—Substances characterised by their function in the composition
- C08L2666/84—Flame-proofing or flame-retarding additives
Abstract
Description
Disclosure of Invention Technical Problem [8] The present invention relates to a process for producing a foamed polystyrene resin particle (bead) having hydrophobicity by discharging the surface of a bead with a low-temperature plasma to improve the adhesion, And more particularly, to a method for producing a composition comprising resin particles coated with a heat insulating material and resin particles coated with a flame retardant.
Specifically, the expanded polystyrene resin particles that have been polymerized are classified according to the application size, and the surface is treated by low-temperature plasma discharge to modify the resin particles. The resin particles having a larger diameter are coated with a heat insulating material, and the resin particles having a smaller diameter are coated with a flame- To a method for producing a composition of expandable polystyrene resin particles having improved heat insulation and flame retardancy by forming fine pores in the surface layer of resin particles using a foamable adhesive in a coating process.
The composition of the present invention is characterized in that 60% by weight to 95% by weight of resin particles coated with a heat insulating material is charged with 5% by weight to 40% by weight of resin particles coated with a flame-retardant substance, To a foamed polystyrene resin particle which is filled with voids between particles to block convection to increase heat-insulating flame retardancy.
The expandable polystyrene resin particles are polymers of styrene, and those obtained by foaming and molding resin particles are referred to as styrofoam. Styrofoam is excellent in productivity, heat insulation, and workability. However, it has a disadvantage that it is vulnerable to fire. In recent years, styrofoam having improved heat insulation and flame retardancy has been demanded. Various attempts have been made to improve the physical properties. Korean Patent Laid-Open Publication No. 2001-0044613 discloses a method for modifying plastics, rubbers and the like by irradiating a short wavelength ultraviolet ray having a wavelength of 184.9 or 253.7 on the surface of a material. Korean Patent Publication No. 2009-0011458 discloses a method for modifying a polyolefin material And irradiating with ultraviolet rays to improve the surface adhesive force. Korean Patent Laid-Open Publication No. 2009-0100633 discloses a method of modifying a surface by irradiating ultraviolet rays to short fibers, and Korean Patent Publication No. 2008-0095858 discloses a method of irradiating plasma to a textile or nonwoven fabric. Korean Patent No. 10-0492199 also discloses a process for producing a foamable styrene polymer containing graphite that can be processed to form expanded polystyrene foam having low density and particularly low thermal conductivity and having good processing properties and good physical properties And WO 2005/51734 discloses a foamable styrene polymer containing graphite or carbon black which forms an expanded polystyrene foam having low density and low thermal conductivity and has good processing characteristics and good physical properties Lt; / RTI >
Korean Patent Publication No. 1300627 discloses a foamable polystyrene resin particle having improved adhesion, coating property, weldability, and heat insulation due to chemical surface modification by physical surface modification and polar functional group generation by subjecting the expandable polystyrene resin particle to low temperature plasma discharge treatment Discloses a technique for producing expandable polystyrene resin particles having excellent heat insulating properties by strongly adhering and coating a heat insulating material, a flame retardant, and a functional material on the surface layer of the modified expanded resin particles. However, the heat insulating material and the flame retardant are mixed and coated on the resin particles There is a problem that the heat insulating property and the flame retardancy are not stable due to the mixing of materials having different uses, and it is difficult to further increase the heat insulating property of the molded article (styrofoam) due to the chemical and physical characteristics of the expandable polystyrene polymer.
The present invention is an improved invention which solves the above-mentioned problems of the above-mentioned Patent No. 10-1300627, which is a prior invention of the above-mentioned invention, and the resin particles having a large average particle size diameter are classified by size classification into foamed polystyrene resin particles, (Fe 2 O 3 ), zinc (Zn) powder, aluminum (Al) powder for the purpose of flame retardancy only, and resin particles having a smaller average particle diameter than the above are coated with graphite, carbon black, ) Powder, antimony trioxide, antimony pentoxide, aluminum hydroxide, magnesium hydroxide, chlorinated paraffin, hexabromocyclododecane (HBCD) phosphorus flame retardant.
The present invention can produce a resin particle having a larger diameter than a diameter of a resin particle coated with a resin particle having a large diameter coated for the purpose of heat insulation and a resin particle having a smaller diameter coated for the purpose of flame retardancy, , The molded product forms a close pore with the physical action of filling the resin particles having a small diameter, and the convection is cut off. Thus, the foamed adhesive is used in the coating process so that the heat insulating property, the flame resistance and the weldability are increased by more than 10% The present invention relates to a composition of expandable polystyrene resin particles which solve the problems of the prior art.
The present invention relates to a foamed polystyrene resin particle surface layer which is subjected to a low-temperature plasma discharge treatment to modify the resin particle surface layer to form voids and irregularities, to change the molecular structure of the resin particle surface layer, The object of the present invention is to prepare polystyrene resin particles.
Another object of the present invention is to improve the heat insulation and the flame retardancy by blocking the convection and the conduction by filling the open pores between the particles by filling the flame-retardant resin particles having a small diameter between the heat insulating resin particles having a large diameter There is a purpose.
It is another object of the present invention to further improve the heat insulation and flame retardancy by forming a fine urethane foam film on the surface layer of the resin particle using a foamable urethane filler in the process of coating a material having heat insulation and flame retardancy.
It is still another object of the present invention to provide a foamed polystyrene resin particle composition as described above, and to produce a foamed polystyrene foam having excellent heat insulation, flame retardancy and aesthetic appearance.
For example, 3 weight parts of impression graphite is coated for the purpose of heat insulation, and the physical structure of the styrofoam formed by foaming 80 times by applying bead steam is such that the resin beads in the form of beads having a low density are closely adhered to each other, It is a form in which voids are formed.
The open pores formed in the molded body can not block the convection and increase the absorption rate, so that the heat insulating function is weakened. If the infrared rays are exposed for a long time, the infrared rays are absorbed excessively and the molded body is deformed. But also in a method for producing conventional expandable polystyrene resin particles in which graphite carbon and heat insulating materials are dispersed therein to improve the heat insulating property.
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a resin composition which is prepared by intentionally injecting resin particles having a diameter smaller than a diameter between pores of resin particles having a large particle size, The resin can be used as an adhesive resin to form fine urethane pores in the surface layer of the resin particle to further increase the heat insulating property and the flame retardancy.
Plasma used in the present invention can be classified into a high-temperature and low-temperature plasma depending on the temperature, which is a nearly neutral state in which ions or electrons are weakly present. Low temperature plasma is widely used in various fields because it modifies the surface properties of metals, semiconductors, polymers, synthetic resins, paper, textiles, paints and various materials and materials and improves adhesiveness and physical properties. Since the low-temperature plasma is generated at atmospheric pressure, it is economical to reduce the costs associated with vacuum maintenance compared with the conventional vacuum plasma. The low-temperature plasma may be broadly classified into, for example, a corona discharge, a dielectric barrier discharge, and a microwave discharge atmospheric glow discharge.
The low temperature plasma irradiation method is suitable for the purpose of modifying the surface of expandable polystyrene resin particles of the present invention and thus can be selected and used as long as the results are the same without being limited by the plasma generation method. However, in the present invention, the method is simple and economical, It is preferable to use the plasma of the corona discharge method being used.
The expandable polystyrene (EPS) resin particle used in the present invention contains a styrene homopolymer or copolymer as a base resin and contains butane or pentane gas as a blowing agent. The expandable polystyrene resin particles are polymeric polymers or copolymers and resin particles having a diameter of about 0.3 to 2 mm are produced in a bead shape irregularly in each polymerization process.
The resin particles that have been polymerized are classified into four kinds in domestic, and the particle size and distribution classified by the manufacturers are somewhat different, but the average particle size is similar to the following. For example, in the case of domestic S company, the size of the resin particle size is classified into a diameter of about 0.45 mm - 0.75 mm 0.75 mm - 0.90 mm 0.90 mm - 1.17 mm 1.17 mm - 1.6 mm. In case of L company, mm-0.71mm 0.58mm-0.96mm 0.80mm-1.23 1.04mm-1.73mm.
The resin particles classified in the above are somewhat different depending on the polymerization process. In the present invention, all of the resin particles classified as above can be used, and resin particle types having a larger average diameter and resin particle particles having an average diameter smaller than that of the resin particles are selected. For example, resin particles having a large particle size and large particle diameter coated with graphite, carbon black, activated carbon, and black dye as a heat insulating material having a high infrared endothermic property and flame retardant materials reflecting infrared rays are coated with zinc, aluminum and iron oxide. When the resin particles are mixed and mixed, the final formed body (styrofoam) increases the heat insulating property and the flame retardancy because the resin particles having a large diameter are filled with small resin particles. The classified resin particles can be used in combination of three or more kinds having different sizes. However, when three or more kinds of resin particles are used, there are problems that the expansion ratio and the molding operation are irregular in the molding process of the bead method. For example, a composition of 0.40 mm - 0.71 m and 0.58 mm - 0.96 mm, or a composition of 0.58 mm - 0.96 mm and 0.80 mm - 1.23 mm, or a composition of 0.80 mm - 1.23 mm and 1.04 mm - 1.73 mm, 60% by weight to 95% by weight of resin particles and 5% by weight to 40% by weight of resin particles having a smaller diameter.
As the heat insulating material used in the present invention, graphite, carbon black, activated carbon, black dye (solvent dye, acid dye) can be used. Graphite is preferably used with impression graphite, and black dyes are broadly classified into solvent dyes and acid dyes. 0.01 to 5 parts by weight, preferably 0.5 to 2 parts by weight, based on 100 parts by weight of the resin particles, and the amount of the adhesive resin is proportionally increased to increase the cost And the physical properties are deteriorated.
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The flame retardant materials used in the present invention include inorganic flame retardants, chlorine-based flame retardants, bromine-based flame retardants, and phosphorus-based flame retardants. Examples of the inorganic flame retardant include metals, metal hydroxides and metal oxides such as Fe 3 O 3 , Fe 3 O 4 , antimony trioxide, antimony pentoxide, Zn, aluminum powder, Aluminum hydroxide, and magnesium hydroxide.
Chlorine-based flame retardants are typically chlorinated paraffin (Cl-PP). Typical examples of the brominated flame retardant include hexabromocyclododecane (HBCD), which is an additive type. Typical examples of the phosphorus flame retardant include a monomer type phosphoric acid ester and a condensed phosphoric acid ester, and one kind or a mixture of at least two kinds thereof 0.01 to 5 parts by weight can be coated with respect to 100 parts by weight of resin particles, preferably 0.5 to 2 parts by weight.
More preferably, the flame retardant is a flame retardant material obtained by mixing at least one of iron oxide (Fe 2 O 3 ), zinc (Zn) powder, aluminum (Al) powder, chlorinated paraffin, antimony trioxide, HBCD, 0.01 to 5 parts by weight based on 100 parts by weight of the particles.
Using ferric trioxide (Fe 2 O 3 ) increases the surface frictional force, which fills the pores between the resin particles coated with the insulating material and increases the fusion of the particles. On the other hand, since the resin particles show red color, A combination of red particles has aesthetic effect.
The present invention relates to a method for producing a foamed polystyrene resin particle, which comprises treating a hydrophobic foamable polystyrene resin particle with a low-temperature plasma to modify the surface thereof to form an adhesion, a coatability and a heat insulating property, a resin particle having a large diameter coated with a heat insulating material and a resin particle having a small diameter coated with a flame- Resin particles having a diameter smaller than that of the resin particles having a larger particle diameter are injected between the pores of the resin particles having a larger particle diameter to block the convection, thereby increasing the heat insulating property and the flame retardancy. Particularly, in the coating process, the foamed polyurethane adhesive is used to form fine pores of the urethane resin on the surface layer of the expandable polystyrene resin particle to improve the heat insulating property and the flame retardancy.
1 is a photograph of a conventional graphite coated high thermal stability styrofoam surface having a void.
Figure 2 is a photograph of a conventional graphite coated high thermal styrofoam surface with voids.
FIG. 3 is a photograph of the surface of the highly thermostable styrofoam of the present invention filled with voids.
FIG. 4 is a photograph of the high-heat-stable styrofoam surface of the present invention filled with voids; 2.
The adhesive resin used in the present invention may be an adhesive resin such as an acrylic resin, an olefin resin, a foamable urethane resin, a polystyrene resin, a vinyl acetate resin, an epoxy resin, a vinyl chloride resin, a chloroprene rubber resin, a silicone resin, And optionally one or more kinds thereof are mixed and sprayed in an amount of 0.1 to 5 parts by weight based on 100 parts by weight of the resin particles and stirred at 100 to 2500 rpm. Preferably, it is 40% by weight to 60% by weight based on the coating weight of the heat insulating material or the flame retardant material, and can be adjusted according to the intended physical properties. If it is necessary to further increase the heat insulation property, it is possible to further increase the heat insulating property and the flame retardancy by forming a fine pore film on the surface layer of the coated resin particle using 0.01 to 5 parts by weight of the foamable urethane adhesive as the adhesive resin for coating.
For example, a two-part foamable urethane adhesive composed of polyol (PPG) and MDI can be used. The foaming and curing time can be controlled, but usually when polyol (PPG) and MDI are mixed, they foam within 30 seconds to 1 minute to form a foam with pores and cure
The polyol used in the present invention contained 10-20 g of a flame retardant, 2 g of silicon, 2 g of a catalyst, 25 g of a foaming agent and 1 g of water, based on 80 g of PPG (PPG), and the mixing ratio was mixed with 195 g of MDI in 130 g of polyol. The silicone contained in the polyol acts to form pores, and the foaming agent and water interact with each other to foam the urethane.
The catalyst serves to activate the chemical reaction in the process of forming polyurethane foam by mixing polyol and MDI. Of course, depending on the use of the final product, the amount of foaming agent, silicone, catalyst, water, etc. added to the polyol may be adjusted. In addition, the chemical composition of the polyol and the mixing ratio of the MDI may be varied in order to determine changes in physical properties such as strength and flexibility during the production of the polyurethane foam. The specific gravity of the polyol of the present invention is 1.14 (20 degrees), the viscosity of the raw liquid is 60-20 cps (20 degrees), the specific gravity of the MDI stock is 1.23-1.25 (20 degrees) and the viscosity of the stock solution is 80-200 cps (20 degrees). A manufacturing method using a foamable urethane adhesive is as follows.
The polyol (PPG) is mixed with one or more selected heat insulating or flame retardant materials, and the mixture is sprayed onto the selected resin particles and stirred at 100-3000 rpm for coating. During the process, the MDI is sprayed in two stages, And one or more selected heat insulating materials or flame retardant materials are put into the resin particles and adsorbed on the resin particles while stirring at 100-3000 rpm and sprayed with polyol (PPG) in one step to coat the MDI Spraying and curing may be carried out. Alternatively, polyurethane (PPG) and MDI may be blended and sprayed for curing. By such a production method, a fine yellow pore film of urethane foam can be formed on the surface layer of the expandable polystyrene resin particle, and the heat insulating property and the flame retardancy can be further increased.
In the present invention, the composition ratio of the expandable polystyrene resin particles is preferably 5 wt% to 40 wt%, and preferably 80 wt% to 20 wt%, based on 60 wt% to 95 wt% of the resin particles coated with the heat insulating material, More preferably 75% by weight: 25% by weight. As the weight% of the heat insulating resin particles increases, the heat insulating property increases and the flame retardancy decreases. Therefore, the ratio can be adjusted appropriately. It is also possible to use the particles as the particles or the resin particles having a larger diameter of the flame-retardant resin.
The corona type plasma discharge selected in the present invention is a phenomenon that when a high voltage is applied to the plasma electrode in the form of gas discharge, only a strong part of the electric field emits light before generating a flame, and thus has conductivity. There are ions and free electrons (free electrons) in the air due to ultraviolet rays or cosmic rays. When a high voltage is applied to a metal electrode, the electric field at the end causes discharge breakdown (insulation breakdown), and discharge starts, and electrons of dozens of eV or more collide with molecules of the air to ionize the molecules. The cathode flows into the cathode and a low-temperature plasma of the corona discharge type is formed.
The purpose of performing the low temperature plasma surface treatment of the corona discharge type on the surface of the expandable polystyrene resin particles in the present invention is to enhance the adsorption adhesion force between the resin particles and the coating material and to improve the heat insulating property and the molding fusion resistance. And the supply energy influences the generation amount and the moving speed of the charged particles, so that the surface treatment degree increases as the supplied energy increases, and there are many kinds of sectional shapes of the discharge electrode.
A corona discharge treatment process of the present invention is as follows: a power generator (3), a circular positive discharge electrode 3-1 formed of aluminum having a thickness of 25 mm × 25 mm and an inner diameter of 300 mm, and a nonconductive (Teflon) (Including gears) 15 mm in length, 30 mm in thickness, and 280 mm in inner diameter 280 mm in diameter, made of Teflon rotating at 50 rpm-1200 rpm in the inside thereof. A circular transparent heat-resistant tempered glass hopper (diameter: 310 mm, height: 150 mm) provided at the upper end of the positive discharge electrode 3-1 (formed of an aluminum plate having a conical shape and having a diameter of 280 mm and a height of 70 mm) 3-3) and a motor drive unit 3-4 of 1.5Kw which is formed on the negative pole 3-2 in the form of a sawtooth gear.
A corona discharge is caused by a high voltage generated in the power supply device 3. 15Kv of 20-50 KHz is applied to the discharge electrode nozzles 3-1 and 3-2 to generate a corona discharge. A corona discharge occurs between the positive discharge electrode 3-1 and the rotating negative-discharge electrode 3-2 due to the high voltage applied from the power supply unit 3, and the discharge electrode 3-1, And (3-2) a corona discharge region is formed at intervals of 5 mm and 10 mm between the tip of the gear and a large amount of ions and electrons having a high energy are generated in the corona discharge region.
The expandable polystyrene resin particles were stored in the hopper 1 provided on the upper part of the corona discharge device and discharged to the screw feeder 2 provided at the lower part of the hopper so that the discharge amount was adjusted to 5 tons per hour, And dropped into a cylinder-type tempered glass hopper 3-3 having a height of 320 mm and a height of 150 mm to allow the resin particles to pass between the discharge electrode 3-1 and (3-2) rotating at 5-1200 rpm. The expandable polystyrene resin particles passing vertically falling between the discharge electrodes (3-1 and 3-2) are reformed by uniformly irradiating plasma in the surface layer of the resin particles in a corona discharge region having a radius of about 5 mm to 10 mm.
The resin particles whose surface layer has been modified by the plasma treatment are discharged to the bottom and stored in the hopper and stored in the hopper 5 by the transfer broo 4 and fall vertically into the vertical mixer 6 and adhere to the heat insulating material or the flame- Spray the virgin resin and stir at 200-3000 rpm. The resin particles coated with the stirring door are vertically dropped into a super mixer (Henschel mixer) of (7), stirred at 200-500 rpm, transferred to a screw conveyor of (9), and dried.
The resin particles that have passed through the screw conveyor are transferred to the oscillating body of the conveying blower and furnace (10) of (4), and dust and defective products are sorted and transported to 11 packing machines and packaged.
Hereinafter, the physical properties and effects of the styrofoam prepared in Examples of the present invention and the styrofoam prepared in the conventional manner will be described in detail. However, the scope of the present invention is not limited to the scope of the present invention, It can be said that all ranges are included.
Example 1.
The resin particles are passed through discharge electrodes rotating at 50 to 1200 rpm at which a corona discharge region having a radius of 5 mm to 10 mm is formed by discharging one kind of polymerized expanded polystyrene particles stored in the silo and vertically falling down to form polystyrene resin particle surface layers with low temperature plasma discharge 2 parts by weight of graphite and 2 parts by weight of vinyl acetate resin (solid content: 33%) were sprayed on 75 parts by weight of resin particles having a large diameter and then coated by stirring at 100 to 3000 rpm to prepare resin particles having a smaller diameter. 2 parts by weight of iron (Fe 2 O 3 ) and 2 parts by weight of a vinyl acetate resin (solid content: 33%) were sprayed and stirred at 100-3000 rpm for coating. Styrofoam (density 28) was obtained by foaming and molding by a known bead method and physical properties were measured.
Example 2.
0.3 parts by weight of a black pigment (carbon black) as a heat insulating material was further contained in the foamable polystyrene resin particles as a heat insulating material and 0.5 part by weight of a flame retardant substance was coated with 0.5 part by weight of a zinc powder. By foam molding and molding, styrofoam ), And physical properties were measured.
Example 3.
The procedure of Example 1 was repeated except that 0.2 part by weight of activated carbon was coated on the foamable polystyrene resin particles with adiabatic flame retardancy and 0.5 part by weight of aluminum powder as a flame retardant material. Styrofoam (density 28) was obtained by foaming and molding by bead method, and physical properties were measured.
Example 4.
The same procedure as in Example 1 was carried out except that 0.2 part by weight of a black dye (acid dye) was further coated. Styrofoam (density 28) was obtained by foaming and molding by bead method, and physical properties were measured.
Example 5.
0.5 parts by weight of aluminum oxide 0.5 parts by weight of zinc 0.5 parts by weight of aluminum acetate 0.5 parts by weight of a vinyl acetate resin 0.5 parts by weight of a phenolic resin 0.5 parts by weight of an acrylic resin was sprayed and stirred at 100 to 2500 rpm to coat the flame- . Styrofoam (density 28) was obtained by foaming and molding by a known bead method and physical properties were measured.
Example 6.
0.5 parts by weight of chlorinated paraffin (chlorine content: 70%) and 0.3 parts by weight of HBCD were added and the adhesive resin was replaced with a foamable urethane resin. One part by weight of polyol (PPG) The mixture was stirred at 100-3000 rpm for coating, and 1.3 parts by weight of MDI was sprayed and coated. Styrofoam (density 28) was obtained by foaming and molding by a known bead method, and physical properties were measured.
* Example 1-5 has similar physical properties, and Example 6 has better adiabatic and flame retardancy than 1-5.
From the mechanical properties, it can be seen that the use of the foamable urethane adhesive in the present invention further increases the heat insulation.
Claims (10)
Treating the resin particle surface layer which falls vertically by discharging the stored resin particles to a space between the negative discharge electrodes rotating inside the positive electrode and a low-temperature plasma. The small particles are injected into the gap between the large- And a method of producing a foamed polystyrene resin particle composition having improved flame retardancy.
Subjecting the low temperature plasma treated resin particles to a silo, discharging the mixture into a vertical blender, stirring the mixture at 100 - 2500 rpm, and spraying the adhesive resin with a heat insulating material or a flame retardant material; Coating a heat insulating material on the foamed polystyrene resin particles having a large average diameter and coating the foamable polystyrene resin particles having a smaller average diameter with the heat insulating material; Transporting the coated resin particles, drying the coated resin particles, and passing the coated resin particles through a vibration screen to remove dust and defective products, and packaging the foamed polystyrene resin particle composition.
The adhesive resin may be at least one selected from the group consisting of an acrylic resin, an olefin resin, a vinyl acetate resin, an epoxy resin, a vinyl chloride resin, a chloroprene rubber resin, a silicone resin, a phenolic resin, By weight based on the total weight of the foamed polystyrene resin particles.
Wherein the adhesive resin has a yellow urethane foam on the surface layer of the expandable polystyrene resin particle.
Wherein the heat insulating material is one or more selected from graphite, carbon black, activated carbon, and black dye.
Wherein the flame retardant substance is at least one selected from the group consisting of an inorganic flame retardant, a chlorine flame retardant, a bromine flame retardant, and a phosphorus flame retardant.
A resin particle having a small diameter is injected into a gap between resin particles having a large diameter and composed of 5 to 40 wt% of resin particles coated with a flame-retardant substance in an amount of 60 to 95 wt% Wherein the foamed polystyrene resin particle composition is obtained by a method comprising the steps of:
A foamed polystyrene resin particle having a foamed urethane resin film formed by coating a foamable urethane resin on a surface layer of a foamable polystyrene resin particle.
The foamed polystyrene resin particles are composed of one or more selected from black, red or yellow foamed polystyrene resin particles.
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| KR101843344B1 (en) * | 2016-04-05 | 2018-03-29 | 김재천 | Expandable polystyrene resin particles and a method of manufacturing |
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