KR20080094134A - Foamed plastic body having excellent flame retardancy and fire resistance, which using multistage hardening mechanism - Google Patents

Abstract

A molded plastic foam body is provided to improve the flame resistance and fire resistance by fixing a flame retardant firmly to the surface of foamed plastic to prevent localization of the flame retardant, and to reinforce elasticity and flexibility. A molded plastic foam body is obtained by a method comprising the steps of: mixing at least one adhesive selected from the group consisting of an adhesive cured in the presence of moisture, an adhesive cured by the reaction with moisture, and a one-part, two-part or catalyst-added adhesive with a silicate under agitation to provide a barrier forming agent; providing foamed beads with an adequate foaming ratio through pre-foaming; coating the barrier forming agent onto the foamed beads; applying heat and pressure to the coated beads to obtain a molded body via fusing and bonding; and drying the molded body.

Description

FOAMED PLASTIC BODY HAVING EXCELLENT FLAME RETARDANCY AND FIRE RESISTANCE, WHICH USING MULTISTAGE HARDENING MECHANISM}

The present invention relates to a foamed plastic molded article excellent in flame retardancy and fire resistance using a multi-step curing mechanism.

In general, foamed plastics or plastics in the form of fibers have been widely used as insulating materials or sound absorbing materials in various buildings.

However, due to the low flash point, melting point, and ignition point, it melts easily in case of fire and emits toxic gases harmful to the human body, and it is easy to propagate the flames, so that the flame spreads to the surroundings and provides the main causes of property damage and human injury caused by fire. It acted as a factor.

Conventional methods for solving these vulnerabilities include the production of flame retardant resins using antimony compounds, oxidation and aluminum hydroxide, magnesium hydroxide, boric acid and borax, phosphates, phosphorus, halogen-based flame retardants, etc. A method of imparting flame retardancy to foamed plastics by molding is known in the art.

However, foamed plastics or plastics produced in this way do not overcome the fundamental shortcomings of organic materials vulnerable to heat and flames, and are only at the level of self-extinguishing, and do not meet the flame retardant performance required in the event of fire.

In recent years, in order to overcome the limitations of organic materials, researches have been actively conducted on technologies for imparting flame retardancy by treating inorganic adhesives, which are non-combustible materials, to foamed plastics or plastics in fiber form. It looks like this:

In Korean Patent Publication No. 10-0529255, "Flame-retardant polystyrene panel", flame retardant coating and fusion of the inorganic non-combustible soda silicate powder in water in water solution, singly or mixed with water glass using microwave on the surface of expanded polystyrene A method for producing expanded polystyrene is disclosed.

However, the prior art as described above uses a method of simultaneously heating the inside and outside of the panel by using microwave to prevent the flame-retardant component from being washed by steam in the conventional fusion molding process by steam. Although it can be prevented, there is a disadvantage that the economic safety due to the expensive microwave generator and the work safety due to the human health of the microwave is weak.

In Korean Patent Publication No. 10-0670404, "Flame retardant board manufacturing method and apparatus", a silicate dry hardening process as described above after the production of a flame retardant composition by mixing a variety of functional materials in an adhesive based on silicate, an inorganic incombustible material In order to compensate for the fragility of the phase, a method of manufacturing a flame retardant board is disclosed by drilling an injection hole on the surface of the molded organic insulating material and injecting a pre-made flame retardant composition into the drilled injection hole and dry curing.

However, the prior art as described above requires a separate perforation device, it is difficult to manufacture a flame retardant board having a variety of thickness, it is impossible to uniformly distribute throughout the filling of the perforated injection hole and the flame retardant composition, and the flame retardant composition is bundled only in the injected surroundings. Phenomenon occurs. In addition, since there is a limit of the thickness that can be injected, there is a disadvantage that the flame retardant performance is poor.

In addition, Korean Patent Application Publication No. 20-0279956 "Flame Retardant Heat Insulation Panel" discloses a method for producing a panel, wherein an inorganic flame retardant is impregnated with polyester fiber yarn and dried to form a flame retardant film.

US Patent No. 5721281 discloses a method for producing a continuous foam porous organic flame retardant prepared by coating a bubble wall with a liquid containing carbonization aids, fillers, and flame retardants in an open cell porous organic material, such as expandable plastics and foam rubbers. It is open.

However, in the prior art as described above, although the liquid used is flame retardant or flame retardant, after the coating such as impregnation, the flame retardant is formed in the upper and lower parts of the molded body due to the subsidence of the flame retardant by gravity during dry molding. There is a downside to falling.

Starch, polyepoxy resin, polyamide resin, polyurethane resin, polyacrylate resin, etc. are used as an adhesive to reinforce this, but it is simply mixed with a carbonization aid or filler to serve as an adhesive. The effect was not found.

In addition, in order to solve such a problem, there is a case of curing using some carbon dioxide, etc. This has a limitation of the process to blow directly to the inside, there is a problem that the formulation of the flame retardant by the blowing pressure is additionally generated.

In order to solve the above problems, in the flame-retardant treatment of foamed plastic or fiber-like plastic with silicate, the flame-retardant is firmly fixed to the foamed plastic surface by stepwise curing using a multi-step curing mechanism, which is subsequently accompanied. The purpose is to remarkably improve the flame retardancy and fire resistance of the foamed plastic molded body by preventing the phenomena of the flame retardant.

In addition, an object of the present invention is to provide a foamed plastic molded article excellent in flame retardancy and fire resistance, in which elasticity and flexibility are enhanced by three-dimensional crosslinking of a moisture-curable adhesive.

The present invention relates to a foamed plastic molded article excellent in flame retardancy and fire resistance using a multi-step curing mechanism.

The first aspect of the production of foamed plastic molded article having excellent flame retardancy and fire resistance using the multi-step curing mechanism of the present invention is one or more selected from one-component, two-component and catalytic additive adhesives cured by curing with moisture or an adhesive that is cured in the presence of moisture. Was prepared by mixing and stirring with a silicate to prepare a diaphragm forming agent, to prepare a foaming beads of the proper foaming ratio through pre-foaming, coating the prepared diaphragm forming agent on the foam beads, and then to the foam beads coated with a fire-resistant diaphragm It consists of forming a molded body by fusion and bonding by applying heat and pressure, and drying to produce a foamed plastic molded body having excellent flame retardancy and fire resistance.

In addition, the second embodiment of the foamed plastic molded article excellent in flame retardancy and fire resistance using the multi-step curing mechanism of the present invention is prepared by preparing a diaphragm forming agent in the same manner as described above, and foaming beads of the proper foaming ratio through pre-foaming After forming the molded body by fusion, the prepared diaphragm forming agent is impregnated, injected, and vacuum adsorbed into the foamed plastic molded body by the method of dehydration and drying after removing the excess diaphragm forming agent. It is composed of producing a foamed plastic molded article excellent in flame retardancy and fire resistance.

In addition, the third aspect of the production of expanded plastic molded article having excellent flame retardancy and fire resistance using the multi-step curing mechanism of the present invention is prepared by preparing a diaphragm forming agent in the same manner as described above, and having an open cell three-dimensional mesh-like porous structure After manufacturing the sheet-shaped plastic molded body manufactured by drawing in the form of fibers or fibers, the diaphragm forming agent prepared therein is impregnated, impregnated, injected, and vacuum adsorbed into the inside, and an appropriate amount of the diaphragm forming agent is introduced from the plastic into which the diaphragm forming agent is added. It is composed of producing a foamed plastic molded article excellent in flame retardancy and fire resistance of the present invention through a dehydration and drying process to have only.

In the flame retardant treatment of foamed plastics with silicates, the inventors of the present invention have undergone a lot of research and trial and error in order to efficiently solve all the problems in the manufacturing process according to the use of silicates, and react with adhesives or moisture cured in the presence of moisture. The present invention has been completed by knowing that one-component, two-component, and catalytically curable adhesives can be mixed with silicates to be cured with a multi-step curing mechanism to solve conventional problems.

In addition, the flame retardant is uniformly distributed inside and outside of the foamed plastic to significantly improve the fire resistance and flame retardancy, and additionally, the three-dimensional crosslinking of the moisture-curable adhesive is intertwined with the silicate network to enhance elasticity and flexibility. A foamed plastic molded article having excellent fire resistance was completed.

The plastic used in the present invention is expanded polystyrene, expanded polyethylene, expanded polypropylene, etc., expanded polyurethane having a three-dimensional mesh-like porous structure as an open cell, phenol foam, etc. Polyester produced by the above.

In addition, the silicate is a compound which is represented by _{M 2 O · nSiO 2 · xH} 2 O, 'M' represents an alkali metal belonging to the periodic table Group 1A 'n' and 'x' is an integer.

Specific examples of alkali metals belonging to Group 1A include lithium, sodium, potassium, and the like.

In the present invention, the one-component, two-component, and catalyst-type adhesives cured by reacting with an adhesive or moisture cured in the presence of moisture include polyurethane, silicone polymer, epoxy, modified epoxy, reactive acrylic adhesive, and cyanoacrylate. Curable adhesives, isocyanates and polymers having modified isocyanate isocyanate groups, and polymers having a reactor capable of reacting with water (H ₂ O).

In the manufacture of the expanded plastic molded article excellent in flame retardancy and fire resistance of the present invention, the multi-stage curing occurs in the following steps.

First, in the case of the first aspect of the present invention in which the diaphragm forming agent of the present invention is coated on the surface of the foamed beads, and then the foamed beads are subjected to fusion molding and drying to produce the expanded plastic molded article of the present invention, Curing occurs after the membrane-forming agent is coated on the prefoamed beads.

1. Primary Curing Mechanism

After the diaphragm forming agent is coated on the surface of the foam beads, the moisture-curable urethane in contact with moisture undergoes the following curing reaction.

NOC-R-CON + H ₂ O → NOC-R-NH ₂ + CO ₂ (1)

NOC-R-NH ₂ + NOC-R-CON → NOC-R-NH-CO-NH-R-CON (2)

Where R is an abbreviation of the formula having a molecular weight by carbon, it may be a monomer or a polymer.

As the isocyanate group (CON) of the moisture-curable urethane reacts with the contacted water, NOC-R-NH ₂ and CO ₂ as shown in the reaction formula (1) Generate gas.

NOC-R-NH ₂ produced at this time is more reactive with isocyanate groups than water, forming a urea reaction, while the two compounds are represented by the reaction of NOC-R-NH-CO-NH-R- It is formed as CON.

The resulting compound is again attached to the terminal isocyanate group is reacted with water as shown in the reaction formula (1) CO ₂ The polycondensation reaction takes place while generating gas.

The reaction of reaction formula (1) and the reaction of reaction formula (2) occur repeatedly in series, and are hardened by three-dimensional crosslinking to form a polymer compound having firm strength and elasticity and flexibility such as rubber.

2. Secondary Curing Mechanism

At the same time as the above-mentioned primary curing, carbon dioxide (CO ₂ ) generated in the moisture-curable urethane curing reaction is CO ₂ It acts as a fastener for sodium silicate, called a process, and the hardening reaction of sodium silicate occurs as a secondary curing mechanism.

3. Tertiary Curing Mechanism

Through the above-mentioned primary and secondary curing mechanisms, the flame-retardant components are firmly fixed to the expanded polystyrene surface in the presence of moisture before dry curing occurs, and in parallel with the dehydration of excess free water through the heat source as the final tertiary curing mechanism. Even hardening of the excess sodium silicate can prevent the ubiquitous phenomenon of the flame retardant material displayed on the surface together with the water from which the flame retardant component is dehydrated.

The tertiary curing mechanism can occur in two forms:

First of all, after forming the molded body by fusion molding the foam beads coated with the diaphragm forming agent immediately after the 1st and 2nd curing mechanisms, the tertiary curing mechanism is generated by the heat source. This is the process of completion.

Second, the foam beads coated with the diaphragm forming agent are further dried using a heat source after the 1st and 2nd curing mechanisms to proceed to the 3rd curing mechanism, and the molded plastic is formed by fusing and bonding the foamed plastics having the multi-step curing mechanism completed. will be.

To further double this effect, different curing agents may be added to further increase the curing step.

In addition, after forming a molded article by fusion of foam beads, the membrane-forming agent of the present invention is impregnated, injected, and vacuum adsorbed into the foamed plastic, and the excess membrane-forming agent is removed through a dehydration process and foamed. In the second aspect of the present invention for producing a plastic molded article, the first and second curing reactions as described above are sequentially performed after the dehydration process, and the third curing reaction is carried out through a drying process. The expanded plastic molded article excellent in the flame retardancy and the fire resistance of this invention is manufactured.

Conventionally, the multi-stage curing mechanism is not applied as described above, and thus there is a problem in that the flame retardancy is lowered due to the ubiquitous phenomenon of the flame retardant.

In addition, the diaphragm forming agent of the present invention is impregnated, injected, and vacuum adsorbed into a sheet-shaped plastic manufactured by foaming plastic or fiber having a porous porous structure having a three-dimensional mesh structure, which is an open cell, and dehydrated and dried. In the third aspect of the present invention for producing a foamed plastic molded article, the first and second curing reactions as described above are sequentially performed through the above dehydration process, and the third curing reaction is carried out through a drying process. The expanded plastic molded article excellent in the flame retardance and fire resistance of this invention is manufactured.

The present invention not only improves the flame retardant performance by preventing the phenomena of the flame retardant described above, but also a polymer compound having elasticity and flexibility such as rubber and solid strength formed by three-dimensional crosslinking of the moisture-curable adhesive in the pre-drying process. Due to this, it is possible to increase the handling strength during the process to increase the workability and productivity, and to prevent deformation and cracks of the molded product which may occur during the subsequent dry curing process.

As described above, the present invention, in the flame-retardant treatment of foamed plastic with silicate, an inorganic adhesive, efficiently solves the problems of manufacturing process by using silicate by using a multi-step curing mechanism, and additionally, three-dimensional of moisture-curable adhesive. It is possible to prepare a foamed plastic molded body for heat insulation and sound absorption excellent in flame retardancy and fire resistance enhanced by elasticity and flexibility by crosslinking.

Meanwhile, in order to more effectively reinforce the object of the present invention, various additives such as an adhesion aid and a reaction accelerator, a reaction delay agent, and a fire resistance enhancer may be further added.

That is, as an adhesion aid to more effectively reinforce the adhesive strength between foamed plastic or fibrous plastic and the silicate forming the fire resistant diaphragm, surfactant, silane coupling agent, PVA (Poly Vinyl Alcohol), EVA (Ethylene Vinyl Acetate Copolymers), Thermosetting resins such as cellulose adhesives, melamine, epoxy, and phenol, and aliphatic amines, alcohols, ethers, ketones, ester compounds, acids, alkaline earth metals and materials containing alkaline earth metals.

In addition, in the present invention, as a curing accelerator used to increase the reaction rate between the silicate and the moisture-curable adhesive to proceed to rapid curing, modified amine, dimethylaminomethylphenol, benzyldimethylamine, pyridine, triethylamine, triethylene diamine, polycap Carbon, epoxy curing agent, dimorpholinyldialkyl ether (DMDEE) and the like can be used.

In addition, in order to secure the pot life of each process, it is possible to use a retarder that can adjust the reaction rate, the retardant used at this time oxycarbon-based, silicides, borate, gluconic acid, sugars, citric acid, etc. There is this.

In addition, in order to more effectively reinforce the object of the present invention to impart flame retardancy, or to form a large number of char (char) at the time of carbonization, to reinforce the strength of the char (char) to prevent deformation of the form by heat Additional refractory enhancers may be added.

In this case, as the refractory enhancer, antimony compound, oxide and aluminum hydroxide, magnesium hydroxide, boric acid and borax, phosphate, phosphorus, halogen flame retardant and graphite, dolomite, calcium carbonate, silica powder, titanium oxide, iron oxide, ether ringite compound, perlite, Fly ash, carbon black and graphite, montmorillonite and bentonite, fine elite or clays based thereon can be added.

Hereinafter, the foamed plastic molded article having excellent flame retardancy and fire resistance using the multi-stage curing mechanism of the present invention will be described in detail.

<Manufacturing process of foamed plastic molded article excellent in flame retardancy and fire resistance using the multi-step curing mechanism according to the first aspect>

1. First Step: Manufacture of Diaphragm Formant

One or more selected from one-component, two-component, and catalyst-added adhesives cured by reacting with moisture or an adhesive cured in the presence of moisture are mixed and stirred with a silicate to prepare a membrane-forming agent.

At this time, the adhesive may react with moisture-curable adhesives such as polyurethane, silicone polymer, epoxy, modified epoxy, reactive acrylic adhesive, cyanoacrylate, polymer having isocyanate and modified isocyanate isocyanate groups, and water (H ₂ O). Polymers having a reactive group;

2. Second Process: Foam Bead Production

Foamed beads of suitable foaming ratio are prepared through pre-foaming of plastics such as expanded polystyrene, expanded polyethylene, expanded polypropylene, and the like.

At this time, the expansion ratio can be arbitrarily adjusted according to the use density of the molded body.

3. Third process: coating

The foam bead surface is coated with the diaphragm forming agent prepared in the first step.

At this time, after the diaphragm forming agent is coated on the beads, the moisture-curable adhesive in contact with moisture occurs in the first curing reaction, and the carbon dioxide generated acts as a fastener of sodium silicate to cause the secondary curing reaction.

Through these primary and secondary curing mechanisms, the flame retardant components firmly adhere to the expanded polystyrene surface in the presence of moisture.

4. The fourth step: fusion. Molding

In the third step, heat and pressure is applied to the foam beads coated with the fire-resistant diaphragm to be fused and molded.

At this time, the tertiary curing reaction occurs by the heat source in the fusion, molding process.

Meanwhile, after the first and second curing reactions are performed before the fusion and molding process, after the third curing reaction is sequentially performed by an additional heat source, the molded body may be manufactured by fusion and bonding.

5. The fifth step: drying

The molded article prepared in the fourth step is dried to prepare a foamed molded article having excellent flame retardancy and fire resistance.

At this time, in the drying process, the molded body is aged.

At this time, the complete tertiary curing mechanism is completed to prevent the ubiquity of the flame retardant material.

<Manufacturing process of foamed plastic molded article excellent in flame retardancy and fire resistance using the multi-step curing mechanism according to the second aspect>

1. First Step: Manufacture of Diaphragm Formant

One or more selected from one-component, two-component, and catalyst-added adhesives cured by reacting with moisture or an adhesive cured in the presence of moisture are mixed and stirred with a silicate to prepare a membrane-forming agent.

At this time, the adhesive may react with a moisture-curable adhesive such as polyurethane, silicone polymer, epoxy, modified epoxy, reactive acrylic adhesive, cyanoacrylate, polymer having isocyanate and modified isocyanate isocyanate groups, and water (H ₂ O). And polymers having a reactor.

2. Second Process: Foam Bead Production

Foamed beads of suitable foaming ratio are prepared through pre-foaming of plastics such as expanded polystyrene, expanded polyethylene, expanded polypropylene, and the like.

At this time. The expansion ratio can be arbitrarily adjusted according to the use density of the molded body.

3. Third process: fusion. Molding

The molded article is manufactured by fusing the beads in the form of beads prepared in the second step.

4. The 4th process: Add diaphragm forming agent

The diaphragm forming agent prepared in the first step is introduced into the foamed plastic molded body by impregnation, injection, or vacuum adsorption.

At this time, in order to facilitate the impregnation, injection, and vacuum adsorption, the foamed plastic molded body may be subjected to the following treatment.

First, when forming a foamed plastic molded body by fusion only a portion of the foamed plastic pellets can be molded to have a cell-like structure open inside, it can be injected between.

The second is to scratch the surface or inside of the foamed plastic molded body by perforation or external processing, so that the diaphragm forming agent of the present invention can be easily introduced into the interior.

Third, the partial repetition or the whole repetition of the process of impregnation, injection, vacuum adsorption and dehydration, and the process of generating a multi-step curing mechanism may be used.

5. The fifth step: dehydration

After the diaphragm forming agent is added in the fourth step, dehydration treatment is performed to remove the excess diaphragm forming agent.

At this time, the primary curing reaction occurs after the dehydration process, and the carbon dioxide generated at this time acts as a fastener of sodium silicate to cause a secondary curing reaction.

Through these primary and secondary curing mechanisms, the flame retardant components firmly adhere to the expanded polystyrene surface in the presence of moisture.

6. The sixth step: drying

The molded body dehydrated in the fifth step is dried to prepare a foamed plastic molded article having excellent flame retardancy and fire resistance.

At this time, aging is performed during the drying process.

In addition, at this time, the tertiary curing reaction occurs, so that the extra sodium hydroxide can be cured in parallel with the dehydration of excess free water through the heat source, thereby preventing the ubiquitous phenomenon of the flame retardant material displayed on the surface along with the water from which the flame retardant is dehydrated. .

<Manufacturing process of foamed plastic molded article excellent in flame retardancy and fire resistance using the multi-step curing mechanism according to the third aspect>

1. First Step: Manufacture of Diaphragm Formant

One or more selected from one-component, two-component, and catalyst-added adhesives cured by reacting with moisture or an adhesive cured in the presence of moisture are mixed and stirred with a silicate to prepare a membrane-forming agent.

At this time, the adhesive may react with moisture-curable adhesives such as polyurethane, silicone polymer, epoxy, modified epoxy, reactive acrylic adhesive, cyanoacrylate, isocyanate and modified isocyanate isocyanate groups, and water (H ₂ O). Polymers having a reactor, and the like.

2. Second Process: Plastic Preparation

A foamed polyurethane, a phenol foam, or the like having a three-dimensional mesh-like porous structure, which is an open cell, and a polyester drawn in a fiber form and manufactured in a sheet or pad form are prepared.

3. The 3rd process: Add diaphragm former

The diaphragm forming agent prepared in the first step is infiltrated into the plastic by the method of impregnation, injection and vacuum adsorption.

4. The fourth step: dehydration

Dehydration treatment is carried out so that the diaphragm forming agent has only an appropriate amount of the diaphragm forming agent.

At this time, the primary curing reaction occurs after the dehydration process, and the carbon dioxide generated at this time acts as a fastener of sodium silicate to cause a secondary curing reaction.

Through these primary and secondary curing mechanisms, the flame retardant components firmly adhere to the expanded polystyrene surface in the presence of moisture.

5. The fifth step: drying

The molded body dehydrated in the fourth step is dried to produce a foamed plastic molded article having excellent flame retardancy and fire resistance.

At this time, aging is performed during the drying process.

In addition, at this time, the tertiary curing reaction occurs, so that the extra sodium hydroxide can be cured in parallel with the dehydration of excess free water through the heat source, thereby preventing the ubiquitous phenomenon of the flame retardant material displayed on the surface along with the water from which the flame retardant is dehydrated. .

On the other hand, in the above production method, it may be prepared by the method of infiltrating the inside, such as impregnation, injection, vacuum adsorption, dehydration process, multi-step curing mechanism process, or partially repeat the entire process.

Hereinafter, a method of manufacturing a foamed molded article excellent in flame retardancy and fire resistance of the present invention will be described in detail through Examples and Experimental Examples, but these are not intended to limit the scope of the present invention.

<Example 1> Preparation of expanded plastic molded article excellent in flame retardancy and fire resistance 1

10 wt% of bentonite and 3 wt% of carbon black were added to 42Be 'sodium silicate, and the mixture was sufficiently stirred, followed by addition of 10 wt% of moisture-curable urethane to the weight of sodium silicate to prepare a membrane-forming agent.

A preformed diaphragm former was uniformly applied to the surface of the expanded polystyrene beads (signalization product, CL 2500F).

The coated foam beads were filled in a mold having a size of 300 × 300 × 210 mm, fused by steam supply, and dried to prepare a foamed molded product of the present invention.

<Example 2> Preparation of expanded plastic molded article excellent in flame retardancy and fire resistance 2

10% by weight of bentonite and 3% by weight of carbon black were added to 42Be 'sodium silicate, and the mixture was sufficiently stirred. Then, 10% by weight of moisture-curable urethane was added to the weight of sodium silicate to prepare a diaphragm forming agent.

Filled with 300 × 300 × 210 mm mold using expanded polystyrene beads (CL 2500F) and fused by steam supply. Molded.

The prepared diaphragm forming agent was placed in the upper part of the molded body, and vacuum-absorbed at a pressure of 300 mmAq from the lower part to penetrate the inside.

In order to remove the excess diaphragm forming agent, dewatering and then drying to prepare a foamed molded product of the present invention.

Example 3 Preparation of Foamed Plastic Molded Article Excellent Flame Retardant and Fire Resistance 3

10% by weight of bentonite and 3% by weight of carbon black were added to 42Be 'sodium silicate, and the mixture was sufficiently stirred. Then, 10% by weight of moisture-curable urethane was added to the weight of sodium silicate to prepare a diaphragm forming agent.

Polyurethane molded bodies having a size of 300 × 300 × 210 mm and a cell size of about 10 pores per linear inch (PPI) were prepared.

The prepared diaphragm forming agent was placed in the prepared molded upper part, and vacuum-absorbed at a pressure of 300 mmAq at the lower part to penetrate the inside.

After dehydration and drying, the foamed molded product of the present invention was prepared.

<Examples 4 to 23>

A foamed plastic molded article was prepared in the same manner as in Example 1 of the present invention, but the type and amount of the additive were prepared as shown in Table 1 below.

<Table 1> Foamed plastic molded article excellent in flame retardancy and fire resistance

division Silicate glue Adhesion Aids Reaction accelerator Reaction retardant Fire Proof Enhancer standard Plastic weight ratio % Of silicate weight Adhesive weight% % Of silicate weight Material name Sodium Silicate Polyurethane phenol DMDEE - - Fly ash Magnesium hydroxide Example 4 50 5 1.5 0 - - 50 30 Example 5 200 2.5 0 0 - - 7.5 7.5 Example 6 600 7.5 15 2 - - 15 5 Example 7 1000 15 20 0 - - 10 1.5 Material name Sodium Silicate urethane - DMDEE - Carbon black Bentonite Magnesium hydroxide Example 8 400 10 - 0 - 1.5 10 1.5 Example 9 600 7.5 - 2 - 5 15 3 Example 10 800 25 - 0 - 20 2.5 0 Example 11 1000 15 - 0.2 - 7.5 10 20 Material name Sodium Silicate Epoxy cement Polyamideamine Citric acid Carbon black ocher Magnesium hydroxide Example 12 100 One 20 0 0.5 3 10 10 Example 13 400 2.5 5 One 0 3 10 0 Example 14 700 10 10 0.5 0 5 5 15 Example 15 1000 5 15 0 3 10 20 5 Material name Potassium Silicate Silicone polymer Phosphoric Acid Isocyanate - Silica powder Diatomaceous earth Perlite Example 16 100 20 0.05 One - 10 5 0.02 Example 17 400 2.5 2.5 0 - 15 10 3 Example 18 700 10 10 0.5 - 5 5 15 Example 19 1000 5 5 0.1 - 25 20 10 Material name Lithium silicate Isocyanate EVA - Silicate Graphite Calcium carbonate borax Example 20 100 One 5 - 0 3 10 0.5 Example 21 400 2.5 20 - 1.5 1.5 10 5 Example 22 700 10 15 - 5 5 5 15 Example 23 1000 5 7.5 - 10 10 20 5

<Examples 24 to 43>

A foamed plastic molded article was prepared in the same manner as in Example 2 of the present invention, but the type and amount of the additive were prepared as shown in Table 2 below.

<Table 2> Foamed plastic molded article excellent in flame retardancy and fire resistance

division Silicate glue Adhesion Aids Reaction accelerator Reaction retardant Fire Proof Enhancer standard Plastic weight ratio % Of silicate weight Adhesive weight% % Of silicate weight Material name Sodium Silicate Polyurethane phenol DMDEE - - Fly ash Magnesium hydroxide Example 24 50 5 1.5 0 - - 50 30 Example 25 200 2.5 0 0 - - 7.5 7.5 Example 26 600 7.5 15 2 - - 15 5 Example 27 1000 15 20 0 - - 10 1.5 Material name Sodium Silicate urethane - DMDEE - Carbon black Bentonite Magnesium hydroxide Example 28 400 10 - 0 - 1.5 10 1.5 Example 29 600 7.5 - 2 - 5 15 3 Example 30 800 25 - 0 - 20 2.5 0 Example 31 1000 15 - 0.2 - 7.5 10 20 Material name Sodium Silicate Epoxy cement Polyamideamine Citric acid Carbon black ocher Magnesium hydroxide Example 32 100 One 20 0 0.5 3 10 10 Example 33 400 2.5 5 One 0 3 10 0 Example 34 700 10 10 0.5 0 5 5 15 Example 35 1000 5 15 0 3 10 20 5 Material name Potassium Silicate Silicone polymer Phosphoric Acid Isocyanate - Silica powder Diatomaceous earth Perlite Example 36 100 20 0.05 One - 10 5 0.02 Example 37 400 2.5 2.5 0 - 15 10 3 Example 38 700 10 10 0.5 - 5 5 15 Example 39 1000 5 5 0.1 - 25 20 10 Material name Lithium silicate Isocyanate EVA - Silicate Graphite Calcium carbonate borax Example 40 100 One 5 - 0 3 10 0.5 Example 41 400 2.5 20 - 1.5 1.5 10 5 Example 42 700 10 15 - 5 5 5 15 Example 43 1000 5 7.5 - 10 10 20 5

<Examples 44-63>

A foamed plastic molded article was prepared in the same manner as in Example 3 of the present invention, but the type and amount of the additive were prepared as shown in Table 3 below.

<Table 3> Foamed plastic molded article excellent in flame retardancy and fire resistance

division Silicate glue Adhesion Aids Reaction accelerator Reaction retardant Fire Proof Enhancer standard Plastic weight ratio % Of silicate weight Adhesive weight% % Of silicate weight Material name Sodium Silicate Polyurethane phenol DMDEE - - Fly ash Magnesium hydroxide Example 44 50 5 1.5 0 - - 50 30 Example 45 200 2.5 0 0 - - 7.5 7.5 Example 46 600 7.5 15 2 - - 15 5 Example 47 1000 15 20 0 - - 10 1.5 Material name Sodium Silicate urethane - DMDEE - Carbon black Bentonite Magnesium hydroxide Example 48 400 10 - 0 - 1.5 10 1.5 Example 49 600 7.5 - 2 - 5 15 3 Example 50 800 25 - 0 - 20 2.5 0 Example 51 1000 15 - 0.2 - 7.5 10 20 Material name Sodium Silicate Epoxy cement Polyamideamine Citric acid Carbon black ocher Magnesium hydroxide Example 52 100 One 20 0 0.5 3 10 10 Example 53 400 2.5 5 One 0 3 10 0 Example 54 700 10 10 0.5 0 5 5 15 Example 55 1000 5 15 0 3 10 20 5 Material name Potassium Silicate Silicone polymer Phosphoric Acid Isocyanate - Silica powder Diatomaceous earth Perlite Example 56 100 20 0.05 One - 10 5 0.02 Example 57 400 2.5 2.5 0 - 15 10 3 Example 58 700 10 10 0.5 - 5 5 15 Example 59 1000 5 5 0.1 - 25 20 10 Material name Lithium silicate Isocyanate EVA - Silicate Graphite Calcium carbonate borax Example 60 100 One 5 - 0 3 10 0.5 Example 61 400 2.5 20 - 1.5 1.5 10 5 Example 62 700 10 15 - 5 5 5 15 Example 63 1000 5 7.5 - 10 10 20 5

Comparative Example 1 Comparative Preparation of Foamed Plastic Molded Article 1

10 wt% of bentonite and 3 wt% of carbon black were added to 42Be 'sodium silicate to prepare a diaphragm forming agent.

A preformed diaphragm former was uniformly applied to the surface of the expanded polystyrene beads (signalization product, CL 2500F).

The coated foam beads were filled into a 300 × 300 × 210 mm sized mold, fused molded by steam, and dried to prepare a foamed molded article.

Comparative Example 2 Comparative Preparation of Foamed Plastic Molded Article 2

10 wt% of bentonite and 3 wt% of carbon black were added to 42Be 'sodium silicate, and the mixture was sufficiently stirred to prepare a diaphragm forming agent.

Filled with 300 × 300 × 210 mm mold using expanded polystyrene beads (CL 2500F) and fused by steam supply. Molded.

The prepared diaphragm forming agent was placed in the upper part of the molded body, and vacuum-absorbed at a pressure of 300 mmAq from the lower part to penetrate the inside.

To remove the excess diaphragm former, dehydration and then drying were carried out to prepare a foamed molded article.

Comparative Example 3 Comparative Production of Foamed Plastic Molded Article 3

10 wt% of bentonite and 3 wt% of carbon black were added to 42Be 'sodium silicate, and the mixture was sufficiently stirred to prepare a diaphragm forming agent.

Polyurethane molded bodies having a size of 300 × 300 × 210 mm and a cell size of about 10 pores per linear inch (PPI) were prepared.

The prepared diaphragm forming agent was added to the prepared molded article, and vacuum-absorbed at a pressure of 300 mmAq at the bottom thereof to penetrate into the inside, dehydrated and dried to prepare a foamed molded article.

<Experimental Example 1> Flame retardant performance test of the foamed plastic molded article of the present invention

Foamed plastic molded articles prepared by the methods of Examples 1, 2 and 3 of the present invention and Comparative Examples 1, 2 and 3 were prepared.

After the prepared molded body was treated under 23 ± 2 ℃ and 50 ± 5% relative humidity according to ISO 554, both surfaces were cut out by 5 mm to increase the reliability of the experiment. Four test specimens were made by dividing into four pieces each having a thickness of 20 mm and named A, B, C and D, respectively.

Each completed test specimen was evaluated for flame retardancy according to KSF ISO 5660-1, and the results are shown in Table 4 below.

<Table 4> Flame retardant performance test results of foamed plastic molded body

Item Flame retardant surface test after manufacture Cracks and holes Time exceeding 200kW / ㎡ maximum heat release rate for 5 minutes (seconds) 5 minutes total discharged heat (MJ / ㎥) Judgment none Do not exceed consecutively for more than 10 seconds 8 or less  Example 1 A none 0 5.1 B none 0 4.8 C none 0 5.4 D none 0 5  Example 2 A none 0 6.5 B none 0 6.8 C none 0 6.6 D none 0 6.4  Example 3 A none 0 7.5 B none 0 6.8 C none 0 6.4 D none 0 7.2  Comparative Example 1 A Partial loss 0 8.8 B none 0 6.4 C none 0 7.2 D none 0 8.4  Comparative Example 2 A Partial loss 2 9.5 B none 0 9.1 C none 0 8.2 D none 0 7.6  Comparative Example 3 A Partial loss 9 12.5 B Partial loss 5 10.3 C none 0 6.0 D none 0 4.6

In addition, the bending strength was evaluated according to the KS M 3808 (foamed polystyrene insulation) test method in order to know the adhesion and the flame retardant fabrication phenomenon, the results are shown in Table 5 below.

<Table 5> Measurement results of density, bending strength and specific strength of foamed plastic molded article

Item Density (㎏ / ㎥) Bending Strength (N / ㎠) Specific Strength (Bending Strength / Density)  Example 1 A 36 20 0.56 B 35 21 0.60 C 35 20 0.57 D 35 20 0.57  Example 2 A 35 18 0.51 B 35 18 0.49 C 35 18 0.51 D 35 17 0.49  Example 3 A 40 22 0.52 B 41 23 0.56 C 41 23 0.56 D 42 23 0.55  Comparative Example 1 A 33 18 0.55 B 34 20 0.59 C 36 21 0.58 D 35 20 0.57  Comparative Example 2 A 30 13 0.43 B 35 17 0.49 C 35 18 0.51 D 37 19 0.51  Comparative Example 3 A 31 14 0.45 B 35 19 0.54 C 43 24 0.56 D 48 26 0.54

As shown in Table 4 and Table 5, Example 1 of the present invention was produced through a multi-step curing mechanism has a high flame retardant molded article with little effect of steam during molding, Comparative Example 1 is supplied with steam Partial loss of the washed part occurred during the flame retardant test because the upper and lower flame retardant was washed inside and the total emission amount exceeded 8 MJ / ㎥.

Density and bending strength were also different between inside and outside.

In addition, Example 2, Example 3, and Comparative Example 2 and Comparative Example 3 of the present invention, in the case of the present invention, there was no formulation of the flame retardant in the test specimen, but in the test specimen of Comparative Example 2 and Comparative Example 3 The flame retardant drove downwards, resulting in severe deviations.

Therefore, it can be seen that the flame retardancy and fire resistance of the expanded plastic molded article using the multi-stage curing mechanism of the present invention are excellent.

According to the present invention, a multi-step curing mechanism is introduced to prepare a foamed plastic molded article, thereby firmly fixing the flame retardant to the foamed plastic surface, thereby preventing ubiquitous phenomenon of the subsequent flame retardant, thereby providing a foamed plastic molded article having remarkably improved fire resistance and flame resistance.

In addition, according to the present invention, embankment problems in the manufacturing process according to the use of silicates are efficiently solved efficiently, thereby increasing the workability and productivity in the production of foamed plastic molded article, the foamed plastic molded article for thermal insulation and sound absorption which has enhanced elasticity and flexibility which is economical Is provided.

Claims (12)

In the expanded plastic molded article, At least one selected from one-component, two-component, and catalyst-added adhesives cured by reacting with moisture or moisture cured in the presence of water is prepared by preparing a membrane-forming agent by mixing and stirring with a silicate, and appropriate foaming ratio through pre-foaming. After preparing the foam beads of the prepared membrane forming agent coated on the foam beads, by applying heat and pressure to the foamed beads coated with the fire-resistant diaphragm, fusion, bonding, molding and drying, Foamed plastic molded article excellent in flame retardancy and fire resistance using a multi-step curing mechanism. In the expanded plastic molded article, At least one selected from one-component, two-component, and catalyst-added adhesives cured by reacting with moisture or moisture cured in the presence of water is prepared by preparing a membrane-forming agent by mixing and stirring with a silicate, and appropriate foaming ratio through pre-foaming. After forming a molded article by fusion of foam beads, the prepared diaphragm forming agent was impregnated, injected, and vacuum adsorbed into the molded body, and then dehydrated to remove excess diaphragm forming agent, followed by drying. Manufactured, Foamed plastic mold with excellent flame resistance and fire resistance using multi-stage curing mechanism. In the expanded plastic molded article, One or more selected from one-component, two-component, and catalyst-added adhesives cured by reacting with moisture or moisture cured in the presence of moisture are mixed with silicate to prepare a diaphragm forming agent, and is prepared as an open cell, three-dimensional network structure. After preparing a sheet-shaped plastic molded product prepared in the form of foamed plastic or fiber having a shape, the membrane-forming agent prepared therein is impregnated, injected, and vacuum adsorbed into the interior, and an appropriate amount from the plastic into which the membrane-forming agent is introduced. Dehydrated and dried to have only a diaphragm forming agent of, Foamed plastic molded article excellent in flame retardancy and fire resistance using a multi-step curing mechanism. The method according to claim 1 or 2, Plastic is characterized in that at least one selected from expanded polystyrene, expanded polyethylene, expanded polypropylene using beads in the form of beads, Foamed plastic molded article excellent in flame retardancy and fire resistance using a multi-step curing mechanism. The method of claim 3, The plastic is characterized in that at least one selected from the group consisting of foamed polyurethane, phenol foam, melanin foam, a fiber having a three-dimensional mesh-like porous structure, which is an open cell, and manufactured in a sheet or pad shape. Foamed plastic molded article excellent in flame retardancy and fire resistance using a multi-step curing mechanism. The method according to any one of claims 1 to 3, The silicate is characterized in that at least one selected from sodium silicate, potassium silicate and lithium silicate, Foamed plastic molded article excellent in flame retardancy and fire resistance using a multi-step curing mechanism. The method according to any one of claims 1 to 3, The adhesive is at least one selected from urethane, silicone polymer, epoxy, modified epoxy, reactive acrylic adhesive, moisture curable adhesive of cyanoacrylate, isocyanate and modified isocyanate, and polymer having a reactor capable of reacting with water. sign, Foamed plastic molded article excellent in flame retardancy and fire resistance using a multi-step curing mechanism. The method according to any one of claims 1 to 3, Characterized in that the silicate is added at least one selected from adhesion aids, fire resistance enhancers, curing accelerators, retarders, Foamed plastic molded article excellent in flame retardancy and fire resistance using a multi-step curing mechanism. The method of claim 8, Refractory enhancers include antimony compounds, oxides and aluminum hydroxides, magnesium hydroxide, boric acid and borax, phosphates, phosphorus, halogen-based flame retardants and graphite, dolomite, calcium carbonate, silica powder, titanium oxide, iron oxide, ether ringite compounds, perlite, fly ash Characterized in that the carbon black and graphite, montmorillonite and at least one selected from bentonite, fine elite or clays thereof, Foamed plastic mold with excellent flame resistance and fire resistance using multi-stage curing mechanism. The method of claim 8, Adhesion aids include surfactants, silane coupling agents, polyvinyl alcohol (PVA), ethylene vinyl acetate copolymers (EVA), cellulose adhesives, melamines, polyesters, phenols, thermosetting resins of aliphatic amines, alcohols, ethers, ester compounds, ketones, Characterized in that it is one or more selected from materials containing acids, alkaline earth metals and alkaline earth metals, Foamed plastic molded article with excellent flame retardancy and fire resistance using a multi-step curing mechanism. The method of claim 8, The curing accelerator is at least one selected from modified amine, dimethylaminomethylphenol, benzyldimethylamine, pyridine, triethylamine, triethylene diamine, polycaptan, epoxy curing agent and dimorpholinyldialkyl ether (DMDEE). sign, Foamed plastic molded article with excellent flame retardancy and fire resistance using a multi-step curing mechanism. The method of claim 8, Retardant is characterized in that at least one selected from oxycarbon, silicides, borates, gluconic acids, sugars, citric acid, Foamed plastic molded article excellent in flame retardancy and fire resistance using a multi-step curing mechanism.