KR20100120088A - Expandable polystyrene bead with fireproofing property, the manufacturing method thereof and nonflammable styropor producing the same bead - Google Patents

Abstract

PURPOSE: A non-combustible foamable polystyrene particle, a manufacturing method thereof, and a non-inflammable styrofoam are provided to mass-produce the noninflammable styrofoam with the excellent workability. CONSTITUTION: A manufacturing method of a non-combustible foamable polystyrene particle comprises the following steps: adding 10~60wt% of non-combustible material powder to a foamable polystyrene particle; and stirring the mixture while adding 0.5~10wt% of solvent with the solubility of the polystyrene, and softening the surface of the polystyrene particle to impregnate and coat the non-combustible material powder to a surface layer of the particle.

Description

Non-combustible expandable polystyrene particles and method for producing the same, and non-combustible styropol made from the particles {Expandable polystyrene bead with fireproofing property, the manufacturing method according to the nonflammable styropor producing the same bead}

The present invention relates to non-combustible expandable polystyrene particles, a method for producing the same, and a non-combustible styropol made from the particles.

Polystyrene foam (Styropol), which is a molded polystyrene foamed polystyrene by the bead method, is widely used as a heat insulating material and a packaging material for thermal insulation of buildings.

Styropol has the advantages of being more environmentally friendly, more productive, lighter and more insulated than most petrochemicals, but it is very vulnerable to fire. The expandable polystyrene particles contain 4 to 7 wt% of pentane gas therein, and since 2 to 4 wt% of pentane gas remains inside the styropol particles even after molding by a conventional bead method, they easily ignite and burn.

In order to reduce the combustibility of the styropol, a technique for inducing plasticity by including a flame retardant such as a bromine compound in the process of expanding polystyrene has been commercialized, but the fire retardant or non-combustible effect cannot be exhibited at the time of fire.

As a method of preparing expandable polystyrene particles having flame retardant performance, a method of adding inorganic powders and a flame retardant in the styrene polymerization process may be considered, but the desired flame retardant effect may be added within 5% by weight as a characteristic of the styrene polymerization process. In addition, the conventional methods of producing a flame-retardant polystyrene by heating and extruding a mixture of pentane gas, a nonflammable powder, a bromine flame retardant, an antimony oxide, a phosphorus compound, and a carbonate flame retardant in a polystyrene resin are also poor in physical properties of the obtained styropol. And the flame retardant performance is very weak.

Korean Patent No. 10-0108656 discloses a method of making dry materials by mixing chlorinated paraffin, antimony oxide, and thermally expandable graphite in an appropriate ratio with polystyrene resin at an appropriate ratio and applying heat of 170-220 ° C. to melt and extrude. Insufficient performance, Korean Patent Publication No. 10-2006-0038862 in the melamine, polypropylene resin, styrene resin, bromine compound, antimony oxide, magnesium hydroxide, calcium carbonate, foaming agent by adding and mixing 170 ~ 220 ℃ It proposes a method of making foamed dry materials by melting and mixing at a temperature, but there is a disadvantage in that the productivity and flame retardant performance of the obtained product are insufficient.

As a technique for solving the problems of the prior arts, there is mentioned Korean Patent No. 10-0878775 and Korean Patent No. 10-0927667 by the present inventors. These techniques consisted of coating a non-flammable inorganic powder, which is harmless to the human body, onto the surface of the polymerized expanded polystyrene particles, which enables the production of styropol with high flame retardancy.

Korean Patent No. 10-0878775 consists of coating 0.5 to 50% by weight of zinc on foamable polystyrene particles, and then further coating with silicate, and using water-soluble vinyl acetate resin or acrylic resin as an adhesive to coat powder on particles. Insufficient electrodeposition power between the powder to be coated and the polystyrene particles has a disadvantage in that the powder falls.

Solving this problem is Korean Patent No. 10-0927667 of the inventor. This patent discloses "One or two or more powders selected from metal oxides, nonmetal oxides, metal hydroxides, dried sodium silicate and diatomaceous earth having a particle size of 1 to 50 µm as a flame retardant in the presence of a binder containing an organic solvent in a flame retardant expandable polystyrene particle. 10 to 60% by weight coated on the outside of the particles ".

This patent solves the problem of the Korean Patent No. 10-0878775 and at the same time obtained a styropol having a very excellent non-flammable performance, but in the coating process of the non-flammable powder, the surface of the polystyrene particles are damaged by excessive melting in the organic solvent, polystyrene particles There was a problem of sticking together.

When this happens, productivity is reduced and the quality of the final product is irregular. In addition, it can be pointed out as a problem that the working environment is inferior with the danger that the sprayed organic solvent may be generated by the friction between the particles during the stirring process of the coating process of the polystyrene particles and the injected organic solvent may explode. In addition, the impact strength and flexural strength of the styropol obtained by this patent is somewhat insufficient, there was also a problem that the absorption rate is not stable.

The present invention is to solve the problems of the prior art by the improved invention of the Korean Patent No. 10-0927667 (hereinafter referred to as "prior art"), excellent workability, and to produce a non-combustible styropol with a low defective rate It is an object to provide expandable polystyrene particles.

Another object of the present invention is to provide a non-combustible styropol having excellent impact strength and flexural strength and low absorption rate. Another object of the present invention is to provide a non-combustible styropol with economical and stable physical properties.

In the method for producing non-flammable expanded polystyrene particles of the present invention, the foamable polystyrene particles and 10-60% by weight of a non-flammable material powder having a particle size of 1-70 μm are mixed and sprayed by spraying a mixture of a solvent and water capable of dissolving polystyrene in the state of stirring and foaming. The polystyrene particle surface layer is softened and the non-combustible powder is allowed to penetrate and coat the surface of the soft foamed polystyrene particles.

In order to improve the impact strength and flexural strength of the final product styropol and stabilize the absorption rate, the coated foamed polystyrene particles may be coated with a water-soluble resin, and may be coated with sodium silicate solution to further improve flame retardancy.

Hereinafter, the present invention will be described in detail.

Non-combustible materials used in the present invention are all non-burning and can be used if the solvent is not reactive, and include metals, metal oxides, metal hydroxides, non-metal inorganic materials, non-metal oxides, non-metal hydroxides, silicates, borate salts, carbonates and the like.

In the present invention, unlike conventional flame-retardant expanded polystyrene particles using a bromine-based flame retardant, phosphorus-based flame retardant, carbonic acid-based flame retardant and the like within 5% by weight, non-combustible powder penetrates and coated on the surface of the polystyrene particles by more than 10% by weight. In order to exhibit sufficient incombustibility, it is preferable that non-combustible powder is used by 16 weight% or more, more preferably 20 weight% or more. When the non-combustible powder is used in the range of 10 to 16% by weight, a process of additionally coating the coated polystyrene particles with sodium silicate solution is required to give a desired level of non-combustibility.

Examples of metals usable in the present invention include zinc, aluminum, magnesium, copper nickel, and the like, and metal oxides include iron oxide, ferric trioxide, triiron tetraoxide, aluminum oxide, zinc oxide, magnesium oxide, and the like. Examples of the metal hydroxides include magnesium hydroxide and aluminum hydroxide. Examples of the nonmetal oxide include silica sand, boric acid, borax, feldspar and the like, and nonmetal hydroxide includes calcium hydroxide and the like. Other sodium silicate solutions, sodium silicate dried graphite, calcium vermiculite and the like can also be used.

The sodium silicate, borate, zinc and the like melt at a temperature of 800 ° C. or lower at a relatively low temperature to form a non-flammable insulating film, and at the same time, act as a flux to perform metal oxides, metal hydroxides, nonmetal inorganic materials, nonmetal oxides, and nonmetal hydroxides. And non-combustible powders such as graphite, vermiculite, talc and calcium carbonate induce the action of melting and foaming together. In the present invention, the appropriate amount of the non-combustible material is 10 to 60% by weight, more preferably 16 to 50% by weight, and even more preferably 20 to 40% by weight. The higher the amount of incombustibles used, the higher the incombustibility, but the inherent advantages of Styropol are reduced.

In the process of penetrating and coating the selected non-combustible material on the surface layer of the expandable polystyrene particles, the expanded polystyrene particles and the selected non-combustible material powder are introduced, and a solvent mixed with a solvent capable of dissolving polystyrene and water is sprayed and stirred.

When the non-combustible material penetrates and is coated with 10% by weight or more, since the surface layer of the expandable polystyrene particles does not directly contact the solvent, the coating efficiency is lowered. To solve this problem, a solvent in which polystyrene is dissolved may be additionally sprayed. The solvent in which the polystyrene is dissolved is the same as that described in the prior art, and the dissolved polystyrene serves to increase the electrodeposition of the incombustible powder and the expandable polystyrene particles.

In the present invention, the expandable polystyrene particles having completed the permeation coating process of the incombustible powders may be additionally coated with a sodium silicate solution (based on a solid content of 30%). The coated particles are first foamed, and the expanded particles are sodium silicate. It may be further coated with a solution. When non-combustible powders are used in the range of 10 to 16% by weight, additional coating with sodium silicate solution can achieve the desired level of flame retardancy.

When more than 40% by weight of the non-combustible material used is used, fire resistance starts to be exerted beyond the non-combustible performance.

The mechanism in which the non-combustible styropol of the present invention exhibits incombustibility or fire resistance is characterized in that the non-combustible material infiltrated and coated on the styropol particle surface layer melts and foams when the flame heats the surface of the styropol, the final product, and forms a non-combustible insulating layer. This is because the heat is prevented from being transferred to the gas, and at the same time, the oxygen supply is interrupted to prevent combustion. This mechanism prevents the flame from penetrating inside and protects Styropol from the flame.

The material for forming the non-combustible insulating film can be variously combined, but considering the cost increase of the product, a combination of a silicon dioxide-containing material and a fluxing material is preferable.

Examples of the silicon dioxide-containing material include silica sand, silica, diatomaceous earth, clay, ocher, kaolin, glass powder, pearl rock, perlite, feldspar, sodium feldspar, and carrie feldspar. You may use it. Examples of the fluxing agent include sodium silicate, boric acid borax, calcium carbonate and zinc. The use ratio of the silicon dioxide-containing material and the material that acts as a flux is suitably in the weight ratio of about 90:10 to 70:30.

An example of another combination of materials for forming a non-combustible insulating film is a combination of a silicon dioxide-containing material and a metal.

Melting points of magnesium, zinc, aluminum, copper, and the like are within 800 ° C., so that these and silicon dioxide-containing materials are mixed to form a non-flammable insulating film. In the case of including a material selected from silver, copper and zinc or a mixture thereof as a nonflammable material, anti-flammability and antimicrobial properties may be imparted. Silver, copper, zinc and the like are well known as substances which exhibit antimicrobial effects.

The method of penetrating and coating the non-combustible material on the surface of the expandable polystyrene particles includes adding 10 to 60% by weight of the non-combustible material powder to the expandable polystyrene particles, sealing the coater, controlling the temperature inside the coater to 50 ° C. or lower, and a speed of 20 to 500 rpm. It is a method of spraying a solvent while stirring.

The reason why the amount of the non-combustible substance is limited as described above is that it is difficult to obtain a desired level of non-combustibility when it is less than this range, and there is no further non-combustibility improvement effect even when used beyond this range.

The rotational speed of the coating machine is appropriately stirred for 3 to 30 minutes at 20 ~ 500rpm, the solvent may be sprayed a certain amount continuously or intermittently spraying. Solvents that can be used include all solvents capable of dissolving styrene. However, in consideration of workability, toluene, ethylbenzene, methyl ethyl ketone, and the like are preferable, and more preferably hydrophilic (MEK) methyl ethyl ketone to be.

In the present invention, the solvent finely dissolves the surface of the expandable polystyrene particles to make the particle surface layer soften just before the dissolution so that the non-flammable material penetrates into the particle surface and is coated so that the surface layer of the polystyrene particles is excessively dissolved. Not only can they be entangled, but the shape of the particles is impaired and out of the sphere, so the polystyrene solubility of the solvent needs to be properly adjusted.

As a method for adjusting the polystyrene solubility of the solvent, water is mixed in a solvent having a polystyrene solubility in the range of 2 to 98% by weight, preferably 5 to 50% by weight, more preferably 20 to 30% by weight. It is a way. By controlling the mixing ratio of solvent and water, it can not only control polystyrene solubility and greatly reduce the risk of fire caused by rapid vaporization of solvent, but also improve workability, reduce defective rate and reduce static electricity. .

The same effect as adding a solvent-water mixture can be obtained by adding water to a stirrer in which the expandable polystyrene particles and the non-combustible powder are stirred, and then adding a solvent. The same effect can be obtained by spraying only the solvent while stirring. Suitable dosage of the solvent in the present invention is 1 to 10% by weight based on the expandable polystyrene particles, preferably 1 to 7% by weight, more preferably 1 to 5% by weight. Even if the input exceeds this range, no further effect can be expected.

Styropol made of the above-mentioned expanded polystyrene particles is excellent incombustibility is formed, but penetrates into the surface of the expandable polystyrene particles, due to the effects of the coating of the non-combustible material powder occurs a problem that the flexural strength and compressive strength is slightly lower than the conventional styropol do. In the present invention, as a method for solving the above problems, the non-combustible powder may penetrate and coat the coated polystyrene particles coated with a water-soluble resin, and the absorption rate of the final product may be lowered by coating the water-soluble resin.

Examples of the water-soluble resin that can be used include vinyl acetate-based resins, acrylic resins, polyvinyl alcohol-based resins, EVA-based (ethylene vinyl acetate) resins, and the like, and these may be used alone or in combination of two or more thereof. Suitable amounts of use are from 0.5 to 10% by weight, more preferably from 1 to 5% by weight. If it is less than this range, the effect of increasing the compressive strength and flexural strength is insufficient, and even if it exceeds this range does not exhibit any improved effect, the cost increases and workability is deteriorated.

The water-soluble resin may be coated on the expandable polystyrene particles before foaming, or may be coated on the first expanded foamable polystyrene particles, but considering the workability, it is preferable to coat the particles before foaming.

In order to further impart non-combustibility to the final product styropol, the coated foamed polystyrene particles may be coated with sodium silicate solution. Since the coating is completed and penetrates into the surface layer of the dried expanded polystyrene particles, the coated non-combustible powders are absorbent, so that the sodium silicate solution is coated while being absorbed. The amount of one coat is 5 to 15% by weight based on a solution of sodium silicate (based on 30% solids). This process can be repeated, and as the repetition is repeated, the incombustibility increases, but the inherent advantages and physical properties of Styropol decrease. The amount of sodium silicate coating is appropriately 10 to 50% by weight.

The previous process, which is a water-soluble resin coating process, may be mixed and mixed with sodium silicate solution, and the same result may be obtained. However, since the two components have different physical properties and specific gravity, phase separation may occur as time passes after mixing. It is desirable to put it into work immediately.

In order to provide further plasticity to the final product, styropol, a known organic flame retardant may be mixed with a non-combustible powder to penetrate and coat the surface of the expandable polystyrene particles, or may be mixed with a water-soluble resin and coated on the particles. Flame retardants which can be used are, for example, ammonium polyphosphate, hexabromo cyclododecane, antimony oxide, and the like, and an appropriate amount of flame retardant is 0.1 to 10% by weight, more preferably 1 to 5, based on the expandable polystyrene particles. Weight percent range.

The present invention solves the problems of the present inventors Korean Patent No. 10-0878775 and the present inventors Korean Patent No. 10-0927667 (prior art), nonflammability, impact strength, flexural strength is extremely excellent, absorption rate Styropol within 0.7 (g / 100 cm 2) can be obtained.

In addition, according to the present invention, it is possible to obtain styropol having both high insulation, antibacterial and non-combustible properties, and mass production of non-combustible styropol, which has been regarded as an impossible area, has become possible.

(Comparative Example 1)

600 kg of expandable polystyrene particles (SH energy chemistry, SE 2000) are transferred to a hopper equipped with an automatic metering device by vacuum suction method, and then put into a vertical cylindrical coater coated with water-repellent silicone rubber, and vacuum 30 kg of zinc powder and 80 kg of borax. The vacuum suction method was transferred to a hopper equipped with an automatic metering device and introduced into the coater.

Sealing the coater, circulating the coolant outside the coater to maintain the inside temperature of the coater at 50 ° C or lower, 4% by weight of a solution of 20% water and 80% MEK (Methyl-ethyl-keton) based on the expandable polystyrene. While spraying, the mixture was stirred for 5 minutes at a speed of 150 rpm. After completion of the stirring, the upper part of the coating machine was opened and dried while spraying air of 50 ° C. or less from which moisture was removed.

Water and solvents evaporated during the drying process were recovered, and zinc and borax were penetrated, and the coated expandable polystyrene particles were discharged from the coating machine and then put into a drier and dried and cured at a temperature of 50 ° C. or lower.

The obtained expanded polystyrene particles were foamed 70 times and molded by the bead method. The produced styropol was silver-colored and flame retardant was formed so that it was hard to catch fire. 2271 The flame retardant material standards of ISO 5660-1 combustion performance test were not met.

( Comparative example  2)

600 kg of expandable polystyrene particles (SH Energy Chemistry SE 2000) were transferred to a hopper equipped with an automatic metering device by vacuum inhalation, and fed into a vertical cylindrical coater coated with a water-repellent silicone rubber, while vacuum weighing 30 kg of a 40 μm magnesium powder and 80 kg of borax. It was transferred to a hopper equipped with an automatic metering device by a suction method, put into a coater, and the coater was sealed and stirred.

The obtained expandable polystyrene particles were foamed 70 times and molded by the bead method. The color of the molded styropol was silvery, and the flame retardancy was formed so that it was hard to catch fire, but the flame retardancy test was carried out by attaching 0.5 mm thick iron plate on both sides. It was not enough.

(Example 1)

The process was carried out in the same manner as in Comparative Example 1, 180Kg of feldspar was added to penetrate and coated. Styropol, formed by foaming 70 times of the expanded foamed polystyrene particles, was light silver in color, and was tested for flame retardancy by attaching a 0.5 mm thick steel plate on both sides, and a semi-combustible material according to KSF 2271 ISO 5660-1 combustion performance test. The criteria were met.

(Example 2)

The same procedure as in Comparative Example 1 was carried out, in which 180Kg of feldspar was added to infiltrate and coated. Styropol, which was foamed and molded 70 times of expanded polystyrene particles, was light silver in color, and was tested for flame retardancy by attaching 0.5 mm thick iron plate on both sides, and according to the semi-combustible material standard of KSF 2271 ISO 5660-1 combustion performance test. And other physical properties were similar to Example 1.

( Example  3)

In the same manner as in Comparative Example 1, 180kg of sodium feldspar was added to infiltrate and coated. Styropol, which was foamed and molded 70 times of the expanded expandable polystyrene particles, was light silver in color, and fire-retardant test was carried out by attaching 0.5 mm of iron plate on both sides. Modified) was met the standard and the other physical properties were similar to Example 2.

( Example  4)

The same procedure as in Comparative Example 1 was carried out, but the infiltration and coating were carried out by adding 120Kg of feldspar and 60Kg of sodium silicate powder. Styropol, formed by foaming 70 times of the expanded foamed polystyrene particles, was light silver in color, and was tested for flame retardancy by attaching a 0.5 mm iron plate on both sides, and according to the semi-combustible material standard of KSF 2271 ISO 5660-1 combustion performance test. Suited.

( Example  5)

It carried out similarly to Example 4, but changed "Kari feldspar 120Kg" into "Kari feldspar 60Kg and iron oxide 60Kg". The flame retardancy test was carried out by attaching a 0.5 mm iron plate on both sides of the styropol prepared from the expanded polystyrene particles, and the material was in compliance with the semi-combustible material standard of KSF 2271 ISO 5660-1 combustion performance test. .

( Example  6)

It carried out similarly to Example 4, but changed "Karizite 120Kg" into "Karizite 60Kg and Magnesium oxide 60Kg". The flame retardancy test was carried out by attaching a 0.5 mm thick iron plate on both sides of the styropol prepared from the expanded polystyrene particles. It was.

( Example  7)

The same procedure as in Example 6 was performed except that the magnesium oxide was changed to aluminum oxide. Styropol, made from the expanded foamed polystyrene particles, was light silver in color, and was tested for flame retardancy by attaching a 0.5 mm thick iron plate on both sides, and was in compliance with the semi-combustible material standard of KSF 2271 ISO 5660-1 Combustion Performance Test. Physical properties were similar to those of Example 6.

( Example  8)

The same procedure as in Example 6 was performed except that the magnesium oxide was changed to zinc oxide. Styropol, made of the finished foamed polystyrene particles, was silvery in color, and was tested for flame retardancy by attaching a 0.5 mm thick iron plate on both sides, and met the semi-combustible material standard of KSF 2271 ISO 5660-1 combustion performance test. Was similar to Example 6.

( Example  9)

The same procedure as in Example 6 was performed except that the magnesium oxide was changed to silica sand. Styropol, made of the finished foamed polystyrene particles, was silvery in color, and was tested for flame retardancy by attaching a 0.5 mm thick iron plate on both sides, and met the semi-combustible material standard of KSF 2271 ISO 5660-1 combustion performance test. Was similar to Example 6.

( Example  10)

The same procedure as in Example 6 was performed except that the magnesium oxide was changed to magnesium hydroxide. Styropol, made of the finished foamed polystyrene particles, was silvery in color, and was tested for flame retardancy by attaching a 0.5 mm thick iron plate on both sides, and met the semi-combustible material standard of KSF 2271 ISO 5660-1 combustion performance test. Was similar to Example 6.

( Example  11)

The same procedure as in Example 6 was performed except that the magnesium oxide was changed to aluminum hydroxide. Styropol, made of the finished foamed polystyrene particles, was silvery in color, and was tested for flame retardancy by attaching a 0.5 mm thick iron plate on both sides. Was similar to Example 6.

( Example  12)

The same procedure as in Example 6 was performed except that the magnesium oxide was changed to calcium hydroxide. Styropol, made from the expanded foamed polystyrene particles, was light silver in color, and was tested for flame retardancy by attaching a 0.5 mm thick iron plate on both sides, and was in compliance with the semi-combustible material standard of KSF 2271 ISO 5660-1 Combustion Performance Test. Physical properties were similar to those of Example 6.

( Example  13)

The same procedure as in Example 6 was performed except that the magnesium oxide was changed to calcium carbonate. Styropol, made from the expanded foamed polystyrene particles, was light silver in color, and was tested for flame retardancy by attaching a 0.5 mm thick iron plate on both sides, and was in compliance with the semi-combustible material standard of KSF 2271 ISO 5660-1 Combustion Performance Test. Physical properties were similar to those of Example 6.

( Example  14)

The same procedure as in Example 6 was performed except that the magnesium oxide was changed to talc. The styropol made from the expanded foamed polystyrene particles was silvery in color, and was tested for flame retardancy by attaching 0.5 mm thick iron plate on both sides. Was similar to Example 6.

( Example  15)

The same procedure as in Example 6 was performed except that "Magnesium Oxide 60Kg" was changed to "Aluminum Powder 30Kg." The styropol made of the finished foamed polystyrene particles was light silver in color, and the flame retardancy test was carried out by attaching a 0.5 mm thick iron plate on both sides, and it was suitable for the semi-combustible material standard of KSF 2271 ISO 5660-1 combustion performance test. .

( Example  16)

The same procedure as in Example 6 was carried out, but "Magnesium oxide 60Kg" was changed to "Diatomaceous earth powder 60Kg". Styropol, made from the expanded foamed polystyrene particles, was light silver in color, and was tested for flame retardancy by attaching 0.5 mm thick steel plates on both sides. Physical properties were similar to those of Example 6.

( Example  17)

The same procedure as in Example 6 was carried out, but "Magnesium oxide 60Kg" was changed to "Tel vermiculite powder 60Kg". Styropol, made from the expanded foamed polystyrene particles, was light silver in color, and was tested for flame retardancy by attaching a 0.5 mm thick iron plate on both sides, and was in compliance with the semi-combustible material standard of KSF 2271 ISO 5660-1 Combustion Performance Test. Physical properties were similar to those of Example 6.

( Example  18)

The same procedure as in Example 6 was carried out, but "Magnesium Oxide 60Kg" was changed to "clay powder 60Kg". Styropol, made from the expanded foamed polystyrene particles, was light silver in color, and was tested for flame retardancy by attaching 0.5 mm thick steel plates on both sides. Physical properties were similar to those of Example 6.

( Example  19)

The same procedure as in Example 6 was performed except that "Magnesium Oxide 60Kg" was changed to "Ocher Powder 60Kg." Styropol, made from the expanded foamed polystyrene particles, was light silver in color, and was tested for flame retardancy by attaching 0.5 mm thick steel plates on both sides. Physical properties were similar to those of Example 6.

( Example  20)

The same procedure as in Example 6 was carried out, but "Magnesium Oxide 60Kg" was changed to "Kolin Powder 60Kg". Styropol, made from the expanded foamed polystyrene particles, was light silver in color, and was tested for flame retardancy by attaching a 0.5 mm thick iron plate on both sides, and was in compliance with the semi-combustible material standard of KSF 2271 ISO 5660-1 Combustion Performance Test. Physical properties were similar to those of Example 6.

( Example  21)

The same procedure as in Example 6 was performed except that "Magnesium Oxide 60Kg" was changed to "Glass Powder 60Kg." Styropol, made from the expanded foamed polystyrene particles, was light silver in color, and was tested for flame retardancy by attaching a 0.5 mm thick iron plate on both sides, and was in compliance with the semi-combustible material standard of KSF 2271 ISO 5660-1 Combustion Performance Test. Physical properties were similar to those of Example 6.

( Example  22)

The same procedure as in Example 6 was performed except that "Magnesium Oxide 60Kg" was changed to "Pearl Rock Powder 60Kg." Styropol, made from the expanded foamed polystyrene particles, was light silver in color, and was tested for flame retardancy by attaching 0.5 mm thick steel plates on both sides. Physical properties were similar to those of Example 6.

( Example  23)

The same procedure as in Example 6 was performed except that "Magnesium Oxide 60Kg" was changed to "Perlite Powder 60Kg." Styropol, made from the expanded foamed polystyrene particles, was light silver in color, and was tested for flame retardancy by attaching a 0.5 mm thick iron plate on both sides, and was in compliance with the semi-combustible material standard of KSF 2271 ISO 5660-1 Combustion Performance Test. Physical properties were similar to those of Example 6.

( Comparative example  3)

In the same manner as in Comparative Example 1, "boric acid 80Kg" was changed to "boric acid 50Kg and graphite 30Kg". Styropol, made from the finished foamable polystyrene particles, was black in color and had somewhat poor adhesion and formability. 0.5mm thick iron plate was attached on both sides, which failed to meet KSF 2271 ISO 5660-1 combustion performance test, but the thermal insulation was improved to 0.033 (w / m · k) based on the density of 16kg / ㎥.

( Example  24)

In the same manner as in Comparative Example 3, 80kg of Carryfeldite was added to infiltrate and coat. Styropol, made from the finished foamable polystyrene particles, was gray in colour, somewhat poor in adhesion and formability. 0.5mm thick iron plate was attached on both sides to comply with KSF 2271 ISO 5660-1 Combustion Performance Test. The thermal conductivity was 0.033 (w / m · k) based on density of 15kg / ㎥.

( Example  25)

3% by weight of EVA (ethylene vinyl acetate) emulsion resin (50% solids) was coated on the expandable polystyrene particles obtained in Examples 1 to 24. Styropol prepared from the expanded foamed polystyrene particles significantly increased the adhesion and formability while maintaining the flame retardant performance and thermal insulation performance. Accordingly, the physical properties of the flexural strength of 15 ~ 17 (N / ㎠), compressive strength of 13 ~ 17 (N / ㎠) at the density of 15kg / ㎥ of molded products were found to be the flexural strength of 27 ~ 34 (N / ㎠) and the compressive strength of 15 ~ 22 ( N / cm 2), and the water absorption was also reduced, so that the absorption rate of all the samples was less than 0.6 (g / 100 cm 2).

( Example  26)

The same procedure as in Example 25 was carried out except that the water-soluble resin was selected from one of "vinyl acetate emulsion" and "acrylic emulsion resin" instead of "EVA", but the physical properties of the styropol obtained in Example 25 were obtained. Similar to

( Example  27)

The same procedure as in Example 25 was carried out, except that EVA (ethylene vinyl acetate) resin "vinyl acetate emulsion resin", "acrylic emulsion resin", and "PVA (polyvinyl alcohol) resin" were mixed and used in the same ratio. Physical properties were similar to the styropol obtained in Example 25.

( Example  28)

In the same manner as in Examples 1 to 24, 0.5% of hexabromocyclododecane was mixed with the non-flammable powder based on the weight of the expandable polystyrene particles. Physical properties of the obtained molded body were similar to those of Examples 1 to 24, but the self-plasticity was slightly increased.

( Example  29)

In the same manner as in Examples 1 to 24, 2% based on the weight of the expandable polystyrene particles was mixed with the non-flammable powder as a flame retardant (phosphorus content 80%). Physical properties of the obtained molded body were similar to those of Examples 1 to 24, but the self-plasticity was slightly increased.

( Example  30)

In the same manner as in Examples 1 to 24, 8% of the nonflammable powder was mixed with ammonium polyphosphate (phosphorus content 20%) as a flame retardant based on the weight of the expandable polystyrene particles. Physical properties of the obtained molded body were similar to those of Examples 1 to 24, but the self-plasticity was slightly increased.

( Example  31)

In the same manner as in Examples 1 to 24, 10% of the nonflammable powder was mixed with antimony oxide as a flame retardant based on the weight of the expandable polystyrene particles. Physical properties of the obtained molded body were similar to those of Examples 1 to 24, but the self-plasticity was slightly increased.

( Example  32)

The same procedure as in Example 25 was carried out, except that 0.5 wt% of hexabromocyclododecane was added to the water-soluble resin based on the expandable polystyrene particles. The physical properties of the obtained molded body were similar to those of Example 25, and the self-plasticity was increased.

( Example  33)

The expandable polystyrene particles obtained in Examples 1 to 32 were coated with 300 Kg of sodium silicate solution (KSM 1415) having a solid content of 30%. The flame retardant performance of the styropol in which the obtained expandable polystyrene particles were molded increased significantly.

( Example  34)

The same procedure as in Example 25 was carried out except that the water-soluble resin was mixed with 300 Kg of sodium silicate solution (KSM 1415) and coated five times. The physical properties of the obtained styropol were similar to those of Example 33.

( Example  35)

The foamed polystyrene particles obtained in Examples 1 to 32 were foamed 70 times by the bead method, and then the foamed particles were coated with 300 Kg of sodium silicate solution (KSM 1415), dried and cured to form Styropol. It was confirmed that it had the same physical properties as the styropol obtained by.

( Example  36)

The incombustible materials obtained in Comparative Examples 1 and 2 were coated with the infiltrated and coated expandable polystyrene particles with sodium silicate solution in the same manner as in Example 33.

Styropol, which was foamed and molded 70 times of the expanded expandable polystyrene particles, was light silver in color, and was tested for flame retardancy by attaching 0.5 mm thick iron plate on both sides. Suitable for.

Claims (14)

10 to 60% by weight of non-combustible material powder having a particle size of 1 to 70 μm was added to the expandable polystyrene particles and stirred, while spraying 0.5 to 10% by weight of a mixture of a soluble solvent of polystyrene and water based on the solvent to form a surface layer of the expandable polystyrene particles. A method for producing non-combustible expanded polystyrene particles in which the non-combustible powders penetrate into the surface layer of the particles and are coated so as to be in a softened state just before dissolution.
The method for producing non-combustible expandable polystyrene particles according to claim 1, wherein the solvent is one or a mixture of two or more of methyl-ethyl-ketone (MEK), toluene, and ethylbenzene.
The method of claim 1, wherein the mixture of the solvent and the water is a non-flammable expanded polystyrene particles, characterized in that the mixture of the solvent and water in a weight ratio of 98: 2 ~ 2: 98.
The method for producing non-combustible expanded polystyrene particles according to claim 1, wherein the non-combustible material is a material which melts at a temperature of 800 ° C or lower to form a film.
The method for producing non-combustible expanded polystyrene particles according to claim 4, wherein the non-combustible material includes a metal oxide, a nonmetal oxide, a metal hydroxide, a silicon dioxide-containing material, graphite and vermiculite.
The method for producing non-flammable expanded polystyrene particles according to claim 1, wherein 0.1% to 10% by weight of one or more selected from bromine flame retardants, phosphorus flame retardants or antimony oxide is added in the penetration and coating processes.
The method for producing a flame retardant foamable polystyrene particle according to claim 1, wherein the expanded polystyrene particle that has penetrated and coated is additionally coated with 0.1 to 10% by weight of a water-soluble resin.
The method of claim 7, wherein the water-soluble resin comprises a vinyl acetate resin, an acrylic resin, a polyvinyl alcohol resin, or an EVA (ethylene vinyl acetate) resin.
The method of claim 7, wherein the water-soluble resin is prepared from flame retardant polystyrene particles, characterized in that containing one to two or more selected from brominated flame retardant or phosphorus flame retardant or antimony trioxide based on the expandable polystyrene particles. Way.
The method for producing non-combustible expandable polystyrene particles according to claim 1, wherein the expanded polystyrene particles, which have been penetrated and coated, are additionally coated with a sodium silicate solution of 10 to 50% by weight (based on 30% solids).
The method of claim 7, wherein the expandable polystyrene particles coated with the water-soluble resin are further coated with a sodium silicate solution of 10 to 50% by weight (based on 30% solids).
A non-combustible expandable polystyrene particle prepared by the method according to any one of claims 1 to 11, wherein 10 to 60% by weight of the incombustible powder penetrates into the surface of the expandable polystyrene particle and is coated.
A method for producing a non-combustible styropol, characterized in that the expanded polystyrene particles according to claim 12 are further coated with 10 to 50% by weight sodium silicate solution to the primary foamed particles by a conventional bead method.
A nonflammable styropol obtained by molding the expandable polystyrene particles according to claim 12 by a conventional bead method.