KR102262924B1 - Composition for deck material with excellent flame retardant - Google Patents

Abstract

The present invention discloses a composition for a deck material which has excellent flame retardancy and can exhibit non-toxic and smoke-free effects. The composition according to the present invention comprises: a flame retardant; a first thermoplastic resin; a second thermoplastic resin; a glass fiber; and a foaming agent; wherein the flame retardant is an inorganic material comprising at least one of magnesium hydroxide and aluminum hydroxide; a third thermoplastic resin; and additives.

Description

Composition for deck material with excellent flame retardancy {COMPOSITION FOR DECK MATERIAL WITH EXCELLENT FLAME RETARDANT}

The present invention relates to a composition for a deck material having excellent flame retardancy.

On trails or hiking trails that require smooth walking by pedestrians, such as parks, lakes, and mountains, deck materials are constructed as a means for pedestrian safety and convenience.

The deck material consists of a fixed beam for supporting the overall structure on the ground according to the terrain, a joist disposed at regular intervals on the upper part of the fixed beam to serve as a support, and a bottom surface, and fixing screws, nails, bolts, etc. constructed using means.

These deck materials are mainly processed wood.

If the deck material is natural wood, it has the advantage of satisfying consumer preference and aesthetics for solid wood, but there is a disadvantage in that toxic substances are emitted during a fire and the fire spreads because of its very low flame retardancy. In addition, when the deck material is natural wood, there is a disadvantage in that warpage occurs because of low strength and formability.

In order to solve this disadvantage, a deck material in which a halogen-based flame retardant is added to a synthetic wood mixed with a conventional thermoplastic resin and wood is used.

The deck material has the advantage of improving flame retardancy, strength, and moldability, but it is known that halogen-based flame retardants generate dioxin, a toxic substance when burned, and has a disadvantage that it is harmful to the human body and the environment.

In order to solve these disadvantages, the development of deck materials with non-halogen-based flame retardants added to synthetic wood is continuously being made, but there is a limit to improving all of the physical properties required of deck materials such as flame retardancy, non-toxicity and non-flammability along with mechanical properties. there is

It is an object of the present invention to provide a composition for a deck material having excellent flame retardancy.

It is also an object of the present invention to provide a composition for a non-toxic and non-flammable deck material.

It is also an object of the present invention to provide a composition for a deck material having excellent mechanical properties.

It is also an object of the present invention to provide a composition for deck material that has excellent thermal stability, and no deformation such as temperature change, distortion due to moisture and sunlight.

It is also an object of the present invention to provide a composition for a deck material that maximizes stability by being able to prevent human accidents caused by smoke in case of fire.

The objects of the present invention are not limited to the objects mentioned above, and other objects and advantages of the present invention not mentioned can be understood by the following description, and will be more clearly understood by the examples of the present invention. Moreover, it will be readily apparent that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

The composition according to the present invention comprises a flame retardant; a first thermoplastic resin; a second thermoplastic resin; glass fiber; and a foaming agent; wherein the flame retardant is an inorganic material comprising at least one of magnesium hydroxide and aluminum hydroxide; a third thermoplastic resin; and additives.

Each of the first and third thermoplastic resins may include at least one of polyethylene (PE), polyvinyl chloride (PVC), and polypropylene (PP).

The second thermoplastic resin may include high-density polyethylene resin (HDPE).

The additive may include at least one of an antioxidant, a UV inhibitor, and a lubricant.

With respect to 100 parts by weight of the flame retardant, 10 to 100 parts by weight of the first thermoplastic resin, 10 to 40 parts by weight of the second thermoplastic resin, 15 to 50 parts by weight of glass fiber and 3 to 10 parts by weight of a foaming agent, and the flame retardant is magnesium hydroxide And with respect to 100 parts by weight of an inorganic material containing at least one of aluminum hydroxide, 25 to 50 parts by weight of the third thermoplastic resin and 3 to 15 parts by weight of additives may be included.

The composition may further include a pigment.

The composition for a deck material according to the present invention has excellent flame retardancy, and may exhibit non-toxic and smoke-free effects.

The composition for a deck material according to the present invention has excellent mechanical properties and excellent thermal stability, so there is no deformation such as temperature change, distortion due to moisture and sunlight.

In addition, the composition for a deck material according to the present invention has the effect of maximizing stability by preventing human accidents caused by smoke in case of fire.

In addition to the above-described effects, the specific effects of the present invention will be described together while describing specific details for carrying out the invention below.

1 and 2 are test reports of the composition for deck material of Example 1 of the present invention.
3 and 4 are test reports of the composition for deck material of Comparative Example 1.

The above-described objects, features and advantages will be described below in detail with reference to the accompanying drawings, and accordingly, those skilled in the art to which the present invention pertains will be able to easily implement the technical idea of the present invention. In describing the present invention, if it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

In the following, that an arbitrary component is disposed on the "upper (or lower)" of a component or "top (or below)" of a component means that any component is disposed in contact with the upper surface (or lower surface) of the component. Furthermore, it may mean that other components may be interposed between the component and any component disposed on (or under) the component.

Also, when it is described that a component is "connected", "coupled" or "connected" to another component, the components may be directly connected or connected to each other, but other components are "interposed" between each component. It is to be understood that “or, each component may be “connected,” “coupled,” or “connected” through another component.

Hereinafter, a composition for a deck material having excellent flame retardancy according to some embodiments of the present invention will be described.

The composition for a deck material according to the present invention is excellent in flame retardancy and has non-toxic and smoke-free properties, and can be applied to floors and pillar frames such as trails and trails, and can also be applied to floors, walls, exterior walls of buildings, etc.

The non-combustible materials, semi-non-combustible materials, and flame-retardant materials mentioned in the present invention are defined according to Article 2 of the Enforcement Decree of the Building Act as follows.

Non-combustible materials are materials that do not burn. Non-combustible materials are based on the condition that the temperature does not rise above 50°C when heated at 750°C for 20 minutes, and there is no residual flame for more than 30 seconds after heating at 305°C for 10 minutes. The test standard for non-combustible materials is the Korean Industrial Standard KSF2271 (flame retardant class 1).

Semi-non-combustible materials are materials with properties comparable to non-combustible materials. Semi-incombustible materials are based on the fact that there is no remarkably harmful deformation such as melting or cracking when heated at 305℃ for 10 minutes, and there is no residual flame for more than 30 seconds after heating is finished. The test standard for semi-non-combustible materials is the Korean Industrial Standard KSF2271 (flame retardant class 2).

Flame-retardant materials are materials that do not burn well. Flame-retardant materials are based on the fact that there is no harmful deformation when heated at 235℃ for 6 minutes, and there is no residual flame for more than 30 seconds after heating is finished. The test standard for flame-retardant materials is Korean Industrial Standard KSF2271 (flame retardant grade 3).

The composition for a deck material according to the present invention includes a flame retardant, a first thermoplastic resin, a second thermoplastic resin, glass fibers and a foaming agent.

The flame retardant includes an inorganic material including at least one of magnesium hydroxide and aluminum hydroxide, a third thermoplastic resin, and an additive.

The composition for the deck material provides excellent flame retardancy and mechanical properties to the deck material by including a flame retardant and a thermoplastic resin as main components.

In general, a flame retardant is a substance that suppresses or relieves combustion by adding or applying it to an organic material of a combustible property. The flame retardant has a mechanism to control the chain reaction in the oxidation region or to control endothermic/decomposition in the reduction region.

Flame retardants are classified into gaseous and solid forms, and are classified into additive and reactive types.

The flame retardant of the present invention includes an inorganic material containing at least one of magnesium hydroxide and aluminum hydroxide, and the flame retardant containing the inorganic material is a solid additive type.

The inorganic material containing at least one of magnesium hydroxide and aluminum hydroxide has a function of dispersing heat and absorbing heat, and has excellent thermal conductivity in the initial stage of heating, thereby suppressing an increase in surface temperature. In addition, the inorganic material _{forms a barrier such as Al 2} O ₃ to suppress the generation of combustible gas and thermal decomposition. In addition, the inorganic material acts to cool and dilute by lowering the temperature while releasing water during combustion, and exhibits an endothermic reaction.

Magnesium hydroxide or / and aluminum hydroxide contained in the flame retardant of the present invention is a main component constituting the flame retardant, imparts a non-flammable, semi-incombustible and flame retardant effect to the material, and serves to remove toxic gas, soot, etc. in case of fire.

Specifically, magnesium hydroxide has an effect of suppressing the generation of smoke, and aluminum hydroxide has effects such as flame retardancy, smoke suppression, corrosion prevention, anti-aging, and insulation performance.

As such, the flame retardant of the present invention has an effect of imparting excellent flame retardancy without generating toxic gas and soot, compared to halogen-based flame retardants and phosphate flame retardants used as conventional flame retardants.

The third thermoplastic resin included in the flame retardant serves as a carrier resin for the flame retardant.

The third thermoplastic resin may include at least one of polyethylene (PE), polyvinyl chloride (PVC), and polypropylene (PP).

Preferably, the third thermoplastic resin may include polyethylene (PE).

Polyethylene has excellent elasticity and heat-adhesiveness, and it is mixed with the flame retardant of the present invention to ensure the dispersibility and compatibility of the flame retardant while ensuring that the flame retardant effect is well transmitted to the material.

Polyethylene can be classified into low density and high density according to a high pressure method, a medium pressure method, and a low pressure method.

Polyethylene is obtained by classifying crude oil to obtain naphtha, decomposing naphtha to obtain ethylene, and polymerizing ethylene. By controlling the density of the polyethylene, low-density and high-density polyethylene are obtained.

Low-density polyethylene (LDPE) is manufactured by heating under a high pressure of 1,000 atm and 200° C. or higher using a small amount of air as a catalyst, and has a density of about 0.91. Because low-density polyethylene has branches, the molecular arrangement is not sufficient and the crystallization portion is about 65%.

Low-density polyethylene has the advantage of being soft and stretchable, although its tensile strength is slightly small, but its impact resistance is large and it is easy to process. In addition, low-density polyethylene has excellent waterproofness, durability, and transparency.

High-density polyethylene (HDPE) uses a so-called Ziegler-Natta catalyst (a complex dye catalyst consisting of titanium tetrachloride and triethylaluminum) to polymerize ethylene at about 70° C. and 10 atm. In general, high-density polyethylene is called low-pressure polyethylene, and the density exceeds 0.95 and the softening point is 120°C or higher. High-density polyethylene has three times or more of the hardness and strength of low-density polyethylene, but has small elongation and impact resistance, is hard to the touch, has few branches, and has large crystallinity, accounting for about 85% of the crystallized portion.

High-density polyethylene is reusable with strong resistance and high strength, and has eco-friendly characteristics that do not emit chemical components and do not detect environmental hormones.

In addition, high-density polyethylene has characteristics such as impact resistance, heat resistance, cold resistance, chemical resistance, and moisture resistance.

Polyvinyl chloride (PVC) is a hygienic material that is light, shiny, and transparent.

Because polypropylene (PP) consists of only carbon and hydrogen, there are no harmful raw materials, it is economical at a relatively low price, and it has excellent transparency and gloss, and excellent impact strength, so it is not easily broken. In addition, polypropylene is light, tasteless, odorless, and non-toxic, so it is hygienic. In addition, polypropylene is an eco-friendly material that does not generate harmful substances such as dioxins during combustion due to its complete combustion characteristics. In addition, polypropylene has high heat resistance and strong durability.

The flame retardant may include 25 to 50 parts by weight of the third thermoplastic resin based on 100 parts by weight of an inorganic material including at least one of magnesium hydroxide and aluminum hydroxide.

When the content of the third thermoplastic resin is less than 25 parts by weight, since the content of the resin serving as the carrier resin of the flame retardant is lowered, it may be difficult to sufficiently secure the performance and effect of the flame retardant.

Conversely, when the content of the third thermoplastic resin exceeds 50 parts by weight, the dispersibility may be slightly reduced while the viscosity of the composition increases, and only the manufacturing cost increases without any further effect of addition.

The flame retardant includes an inorganic material including at least one of magnesium hydroxide and aluminum hydroxide, and an additive of at least one of antioxidants, UV inhibitors, and lubricants together with the third thermoplastic resin.

Antioxidants prevent materials from decomposing or aging by heat or light.

The antioxidant may include a low-volatile polymeric phenolic material such as butylhydroxyphenyl propionic acid and butylhydroxyphenyl acetic acid.

When a material is exposed to the outside, it selectively absorbs ultraviolet rays out of the sun's rays and converts them to thermal energy, or by extinguishing free radicals generated by decomposition from ultraviolet rays, it prevents the thermoplastic resin from decomposing from ultraviolet rays. The material containing the UV inhibitor can improve durability by preventing deterioration of physical properties.

UV inhibitor is one of benzophenone, benzotriazole, nickel compound, aryl ester, benzoate, hydroperoxide decomposer, amine compound, cresols, melamines It may include more than one species.

The amine-based compound may include 2,2,6,6-tetramethyl-4-piperidyl stearate, 1,2,2,6,6-pentamethyl-4-piperidyl stearate, and the like. .

The lubricant lubricates the metal part in contact with the thermoplastic resin during extrusion processing to reduce friction with the metal, improve fluidity and dispersibility of each component, and prevent the thermoplastic resin from being carbonized.

The lubricant may include at least one of silicone oil, paraffin-based material, and naphthen-based material.

The flame retardant may include 3 to 15 parts by weight of an additive based on 100 parts by weight of an inorganic material including at least one of magnesium hydroxide and aluminum hydroxide.

When the content of the additive is out of 3 to 15 parts by weight, the anti-oxidation effect, the anti-UV effect, the dispersibility effect, the carbonization prevention effect, etc. may be insufficient.

The composition for a deck material according to the present invention includes a first thermoplastic resin, a second thermoplastic resin, glass fibers and a foaming agent together with the flame retardant.

Since the flame retardant is the same as described above, it will be omitted.

The first thermoplastic resin may include at least one of polyethylene (PE), polyvinyl chloride (PVC), and polypropylene (PP).

Preferably, the first thermoplastic resin may include polypropylene (PP).

Polypropylene (PP) has excellent impact strength and heat resistance, and is hygienic as it is tasteless, odorless, and non-toxic, so it can provide excellent impact strength when processing as a deck material.

Based on 100 parts by weight of the flame retardant, 10 to 100 parts by weight of the first thermoplastic resin may be included. Preferably, 15 to 80 parts by weight of the first thermoplastic resin may be included.

When the content of the first thermoplastic resin is less than 10 parts by weight, it may be insufficient to ensure impact strength.

Conversely, when the content of the first thermoplastic resin exceeds 100 parts by weight, the dispersibility may be slightly reduced while the viscosity of the composition increases, and only the manufacturing cost increases without any further effect of addition.

The second thermoplastic resin may include high-density polyethylene resin (HDPE).

High-density polyethylene gives the deck material excellent shock absorption and plays a role in maintaining the ductility of the deck material. Accordingly, it can exhibit excellent processability when manufacturing a deck material from the composition.

In addition, high-density polyethylene exhibits strong resistance and high strength, and has eco-friendly characteristics in which environmental hormones are not detected.

Based on 100 parts by weight of the flame retardant, 10 to 40 parts by weight of the second thermoplastic resin may be included. Preferably, 15 to 30 parts by weight of the second thermoplastic resin may be included.

When the content of the second thermoplastic resin is less than 10 parts by weight, it may be insufficient to ensure shock absorption and ductility.

Conversely, if the content of the second thermoplastic resin exceeds 40 parts by weight, the workability of the deck material is lowered and hard (hard) properties are given rather than ductility, so it may be insufficient to satisfy mechanical properties such as flexural elasticity or elongation. In addition, as the viscosity of the composition increases, the dispersibility may be slightly lowered, and only the manufacturing cost increases without further effect of addition.

The glass fiber is made of molten glass in a fiber shape, and provides excellent flexural modulus and dimensional stability to withstand high loads when manufacturing a deck material.

When the deck material has excellent dimensional stability, it can maintain its original size without changing its length, width, thickness, and shape under various environmental conditions.

The glass fiber may be formed from non-alkali sand or heavy alkali sand, but is not limited thereto. Alkali-free sand indicates that it is superior in strength and corrosion resistance compared to heavy alkali sand.

Glass fibers may be classified into long fibers and short fibers according to their length, and the glass fibers of the present invention may include both long fibers and short fibers.

For example, the diameter of the glass fiber may be 0.1 ~ 10㎛, the length may be 1 ~ 300㎛, but is not limited thereto.

Based on 100 parts by weight of the flame retardant, 15 to 50 parts by weight of glass fiber may be included. Preferably, it may contain 20 to 40 parts by weight of glass fibers.

When the content of the glass fiber is less than 15 parts by weight, it may be insufficient to ensure excellent flexural modulus and dimensional stability.

Conversely, if the content of the glass fiber exceeds 50 parts by weight, the flexural modulus and dimensional stability can be secured, but the impact absorption rate of the deck material may be slightly lowered, the weight may increase, and the manufacturing cost will increase.

The foaming agent foams during the molding process of the composition so that the deck material has a porous structure. When the foaming agent is included in the composition, weight reduction can be obtained for easy construction of the deck material, and the piece operation is convenient, and it can have a low specific gravity characteristic.

As the foaming agent, the higher the content of the gas to be foamed, the more advantageous and stable the structure can be provided. In addition, as a foaming agent, it is easy to control the decomposition temperature and non-toxic can be used.

The blowing agent is an inorganic gas-based blowing agent such as nitrogen, argon, and air, a chlorofluorocarbon-based blowing agent such as CFC-11 and HFC, azodicarbonamide (C ₂ H ₄ N ₄ O ₂ ), sodium hydrogen carbonate (NaHCO) ₃ ) and/or sodium carbonate (NaCO ₃ ) It may contain one or more of the powder-type foaming agent.

Based on 100 parts by weight of the flame retardant, 3 to 10 parts by weight of a foaming agent may be included. Preferably, 5 to 8 parts by weight of a foaming agent may be included.

If the content of the foaming agent is out of 3 to 10 parts by weight, it may be insufficient to secure the workability and weight reduction of the deck material, and only the manufacturing cost will increase without the effect of addition.

The composition for the deck material may further include a pigment.

The pigment may be added to maintain the color or texture of the wood, and may be added to induce pedestrians to easily identify the floor surface of the deck material.

The pigment may include one or more inorganic pigments among iron oxide, synthetic pigment iron oxide, mica, and perlite.

The iron oxide may be used in the process of manufacturing steel, collected from a furnace, etc. At this time, iron oxide includes ferrous oxide which is black powder, ferric oxide which is red powder, and triferric tetraoxide which is black powder.

In addition, when clay with a high iron content is fired, a red brick color appears, and when iron oxide is added to an alkali-containing boric acid glaze, a dark red color is displayed.

The synthetic pigment iron oxide, a glaze mixed with cobalt oxide or manganese compound, copper compound, etc. with iron oxide shows black color, and shows various color tones depending on the composition or heating temperature of other glazes.

Mica is a silicate mineral, and its types include muscovite mica, gold mica, black silver hair, fluorescent silver hair, red silver hair, soda silver hair, sericite, and the like, and various colors are given to itself.

In applying mica to the dye, fine crystals, for example, those molded into fine crystals having a particle size of 600 to 1200 mesh, may be applied so as to satisfy the required performance with excellent coloring power.

Perlite is a product of calcining pearlite made of volcanic stone at 900 ~ 1200℃ and then calcining and expanding it. It has a lead-like color like pearls and is usually gray or brown or blue and red.

In applying perlite to the pigment, fine crystals, for example, those molded into fine crystals having a particle size of 600 to 1200 mesh can be applied so as to satisfy the required performance with excellent coloring power.

As such, the inorganic pigment containing at least one of iron oxide, synthetic pigment iron oxide, mica, and pearlite can represent red, brown, black, yellow, green, blue, and white colors, or a mixture thereof, and can represent any desired color. have.

Based on 100 parts by weight of the flame retardant, 3 to 10 parts by weight of a dye may be included.

If the content of the pigment is out of 3 to 10 parts by weight, it may be insufficient to maintain the color and texture, and only the manufacturing cost is increased without the effect of the addition thereof.

As such, the composition for deck material having excellent flame retardancy according to the present invention includes an inorganic-based flame retardant, a first thermoplastic resin, a second thermoplastic resin, glass fiber and a foaming agent, thereby providing excellent flame retardancy and mechanical properties to the deck material.

In particular, the composition for the deck material does not contain fillers such as calcium carbonate, halogen-based flame retardants, and phosphate flame retardants, and exhibits excellent flame retardancy and non-toxic smoke-free properties, so it is advantageous to secure stability in case of fire.

The composition for the deck material may be prepared by adding a flame retardant in a master batch (MB) type.

The flame retardant of the present invention is a master batch kneaded by mixing at a higher concentration than prescribed in advance in the mixing process, and can improve the dispersibility of the composition and impart physical properties required by the deck material.

In order to prepare the composition for the deck material, the first thermoplastic resin, the second thermoplastic resin, glass fiber and the foaming agent are mixed and stirred at 23 to 80° C., and then a flame retardant may be added.

The flame retardant is a mixture of an inorganic material including at least one of magnesium hydroxide and aluminum hydroxide, a third thermoplastic resin, and an additive at 25 to 80°C.

A detailed example of the composition for a deck material having excellent flame retardancy is as follows.

1. Preparation of composition for deck material

Example 1

After mixing 75 parts by weight of polypropylene resin (PP), 25 parts by weight of high-density polyethylene resin (HDPE), 35 parts by weight of glass fiber, 7.5 parts by weight of azodicarbonamide as a foaming agent and 7.5 parts by weight of iron oxide as a pigment at room temperature, 100 parts by weight of a flame retardant A composition for deck material was prepared by adding parts.

The flame retardant is based on 100 parts by weight of magnesium hydroxide, 25 parts by weight of polyethylene resin (PE), antioxidant (butylhydroxyphenyl propionic acid) as an additive, a total of 3 parts by weight of a UV inhibitor (benzophenone), a lubricant (silicone oil) at room temperature mixed in.

Example 2

After mixing 16.7 parts by weight of polypropylene resin (PP), 16.7 parts by weight of high-density polyethylene resin (HDPE), 23.3 parts by weight of glass fiber, 5 parts by weight of azodicarbonamide as a foaming agent and 5 parts by weight of iron oxide as a pigment at room temperature, 100 parts by weight of a flame retardant A composition for deck material was prepared by adding parts.

The flame retardant is based on 100 parts by weight of magnesium hydroxide, 25 parts by weight of polyethylene resin (PE), antioxidant (butylhydroxyphenyl propionic acid) as an additive, a total of 3 parts by weight of a UV inhibitor (benzophenone), a lubricant (silicone oil) at room temperature mixed in.

Example 3

A composition for a deck material was prepared under the same conditions as in Example 2, except that the flame retardant contained aluminum hydroxide instead of magnesium hydroxide.

Example 4

A composition for a deck material was prepared under the same conditions as in Example 1, except that the flame retardant contained 50 parts by weight of a polyethylene resin (PE).

Comparative Example 1

83 parts by weight of polypropylene resin (PP), 50 parts by weight of high-density polyethylene resin (HDPE), 50 parts by weight of calcium carbonate, 50 parts by weight of glass fiber, 6.7 parts by weight of azodicarbonamide as a foaming agent, and 10 parts by weight of iron oxide as a pigment at room temperature. After mixing, 100 parts by weight of a flame retardant was added to prepare a composition for a deck material.

The flame retardant is based on 100 parts by weight of the brominated flame retardant, 25 parts by weight of a polyethylene resin (PE), an antioxidant (butylhydroxyphenyl propionic acid) as an additive, a UV inhibitor (benzophenone), a lubricant (silicone oil) in a total of 3 parts by weight It was mixed at room temperature.

Comparative Example 2

A composition for a deck material was prepared under the same conditions as in Comparative Example 1, except that it contained 30 parts by weight of high-density polyethylene resin (HDPE) and did not include calcium carbonate.

Comparative Example 3

A composition for a deck material was prepared under the same conditions as in Example 1, except that it contains 110 parts by weight of a polypropylene resin (PP).

Comparative Example 4

A composition for a deck material was prepared under the same conditions as in Example 1, except that it included 60 parts by weight of glass fiber.

Comparative Example 5

A composition for a deck material was prepared under the same conditions as in Example 1, except that the flame retardant contained 60 parts by weight of a polyethylene resin (PE).

Comparative Example 6

A composition for a deck material was prepared under the same conditions as in Example 1, except that it contains 5 parts by weight of a polypropylene resin (PP).

Comparative Example 7

A composition for a deck material was prepared under the same conditions as in Example 1, except that it contains 5 parts by weight of high-density polyethylene resin (HDPE).

2. Methods for evaluating physical properties and their results

Tables 1 and 2 show the results of evaluation of physical properties for the compositions of Examples 1 to 4 and Comparative Examples 1 to 7.

Physical property evaluation was measured according to the specifications described in Tables 1 and 2.

The shrinkage and expansion is a value obtained by measuring the change in length according to a temperature change of 0°C to 30°C using a sample having a length of 2,400 mm, a width of 150 mm, and a thickness of 25 mm.

[Table 1]

[Table 2]

[Table 3]

Referring to Tables 1 to 3, Examples 1 to 4 show excellent basic physical properties such as impact strength and flexural strength and excellent dimensional stability.

On the other hand, Comparative Examples 1 to 7 show relatively low mechanical properties.

Tables 4 and 5 show the evaluation results of the 45 degree combustion test and the smoke density test.

Afterflame time is the time until the end of the burning state by raising the flame after removing the burner flame.

The remaining time is the time until the end of burning without a flame after removing the flame of the burner, excluding the time during which after-flame is generated.

The test conditions are temperature 20±15℃, humidity 50±30% RH.

The test method is Article 7 of the flame-retardant performance standard (Fire Service Notification No. 2019-2).

The result value of Example 1 of Table 4 is a value described by calculating the average of three test results of FIGS. 1 and 2 .

[Table 4]

The result value of Comparative Example 1 of Table 5 is a value described by calculating the average of three test results of FIGS. 2 and 3 .

[Table 5]

[Table 6]

1 and 2 are test reports of the composition for deck material of Example 1 of the present invention.

3 and 4 are test reports of the composition for deck material of Comparative Example 1.

The above test report was requested by the applicant, Polyone Technology Co., Ltd., to the Korea Fire Industry Technology Institute on September 23, 2020.

Referring to Table 4, Figures 1 and 2, Example 1 of the present invention was judged suitable for the test standards in the after-flame time, residual time, carbonization area and carbonization length items.

The afterflame time was 0 seconds based on less than 10 seconds. The rest time was 0 seconds in all cases within 30 seconds.

Carbonized area showed a 30cm ² to 50cm ² or less within standards. Carbonization length was 8cm or less based on 20cm or less.

In the smoke density test (ASTM E 662, 25 kW/m ² ), Dm _(corr) was 200 or less based on 400 or less.

On the other hand, referring to Tables 5, 6, 3 and 4, Comparative Example 1 showed relatively lowered physical properties than Example 1 of the present invention in terms of after-flame time, after-life time, carbonization area, and carbonization length. .

In the smoke density test, the value exceeded the test standard.

As described above, the present invention has been described with reference to the illustrated drawings, but the present invention is not limited by the embodiments and drawings disclosed in this specification, and various methods can be obtained by those skilled in the art within the scope of the technical spirit of the present invention. It is obvious that variations can be made. In addition, although the effects according to the configuration of the present invention are not explicitly described and described while describing the embodiments of the present invention, it is natural that the effects predictable by the configuration should also be recognized.

Claims (6)

flame retardant; a first thermoplastic resin; a second thermoplastic resin; glass fiber; and a blowing agent;
The flame retardant
an inorganic material comprising at least one of magnesium hydroxide and aluminum hydroxide;
a third thermoplastic resin; and
additives; and
A composition comprising 20 to 40 parts by weight of glass fibers with respect to 100 parts by weight of the flame retardant.
According to claim 1,
Each of the first thermoplastic resin and the third thermoplastic resin comprises at least one of polyethylene (PE), polyvinyl chloride (PVC) and polypropylene (PP).
According to claim 1,
The second thermoplastic resin is a composition comprising a high-density polyethylene resin (HDPE).
According to claim 1,
The additive is a composition comprising at least one of an antioxidant, a UV inhibitor, and a lubricant.
According to claim 1,
With respect to 100 parts by weight of the flame retardant, 10 to 100 parts by weight of the first thermoplastic resin, 10 to 40 parts by weight of the second thermoplastic resin, 20 to 40 parts by weight of glass fiber, and 3 to 10 parts by weight of a foaming agent,
The flame retardant
A composition comprising 25 to 50 parts by weight of a third thermoplastic resin and 3 to 15 parts by weight of an additive based on 100 parts by weight of an inorganic material containing at least one of magnesium hydroxide and aluminum hydroxide.
According to claim 1,
The composition further comprises a pigment.

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