KR20060026990A - Resin composition for flooring for reducing sick house syndrome - Google Patents

Abstract

The present invention relates to a resin composition for flooring to reduce the sick house syndrome, and more particularly, by using a very small amount of volatile organic compounds harmful to the human body to enable the production of flooring, as a result, the amount of volatile organic compounds released The present invention relates to a resin composition for a flooring material, which can produce a flooring material having an effect of reducing the sick house syndrome due to extremely little even if there is no or none, and dramatically reduces the type and amount of harmful substances generated during combustion.

Birdhouse Syndrome, Flooring, Resin Composition

Description

RESIN COMPOSITION FOR FLOORING FOR REDUCING SICK HOUSE SYNDROME}

The present invention relates to a resin composition for flooring to reduce the sick house syndrome, and more particularly, by using a very small amount of volatile organic compounds harmful to the human body to enable the production of flooring, as a result, the amount of volatile organic compounds released The present invention relates to a resin composition for a flooring material, which may produce flooring having an effect of reducing the sick house syndrome due to extremely little even if there is no or none.

Sick house syndrome is a condition in which the health of a person living in a new house is deteriorated by the slow release of volatile organic compounds contained in or used in the interior of the building itself such as flooring or wallpaper. It is a big social problem recently.

Currently, wood-based flooring materials commonly used as residential flooring materials include wood flooring, plywood flooring, and reinforced flooring.Wood flooring is a flooring material in which veneers of 5 ~ 7 layers are laminated on a plywood layer. Plywood flooring is a flooring material with the same composition or surface layer as the solid wood flooring, which is usually about 0.6mm level. On the other hand, the reinforced floor is a flooring material having a decorative sheet (deco-sheet) attached to the surface of the Medium Density Fiberboard (MDF) or High Density Fiberboard (HDF).

Generally, these wood based flooring materials using wood materials have been recognized as eco-friendly materials, but in fact, they are not. The plywood layer constituting the wood floor or plywood floor uses urea resin or melamine resin as an adhesive when bonding the plywood layers. These urea resins and melamine resins are made by polymerization of urea, formaldehyde and melamine and formaldehyde, respectively. . Therefore, formaldehyde is basically inherent in these resins. In addition, since MDF or HDF, which is a constituent layer of reinforcement floor, is formed by polymerization of phenol and formaldehyde, phenol resins generally used at the time of manufacturing thereof also formally intrinsic to formaldehyde.

In addition, solid wood floor, plywood floor and reinforced floor all contain a volatile organic compound because the decorative surface layer is adhered to the plywood layer or MDF by using an adhesive using an organic solvent.In addition, wood, which is a component of the plywood layer and MDF, To prevent rot, use it after prolonged deposition in formalin solution for the first time and dried. Therefore, contrary to what is known as an environmentally friendly material, wood flooring is a factor that worsens sick house syndrome.

On the other hand, in addition to wood-based flooring, residential flooring containing polyvinyl chloride (PVC) -based resin is also commonly used. This polyvinyl chloride resin must be added to the plasticizer in the nature of the process, these plasticizers are defined as endocrine-causing substances in most cases, when using a flooring made of a material containing a large amount of these plasticizers for residential use, It can have a very bad effect on the health of the people living in the house.

In addition, since polyvinyl chloride resin contains chlorine in the polymer chain, dioxin, which is classified as a carcinogen and endocrine disruptor, is generated during combustion due to fire, etc., and hydrogen chloride gas generated during combustion is corrosive. This is a very strong, toxic and deadly harmful substance to the human body.

Therefore, as described above, due to the problems of wood-based flooring worsening sick house syndrome and the problem of polyvinyl chloride-based interior materials that can release human harmful substances such as plasticizers and can generate substances that are very harmful to the human body upon combustion. The development of new flooring materials is required, and wood-based flooring materials are not flame retardant and thus easily ignite when a fire occurs. Therefore, the development of flooring materials with flame retardancy and flame retardancy is also reduced. It is required.

The present invention is to solve the conventional problems as described above, an object of the present invention, by reducing the amount of harmful volatile organic compounds released by flooring resin which can produce a flooring having the effect of reducing the sick house syndrome It is to provide a composition.

It is still another object of the present invention to reduce the release of harmful volatile organic compounds, thereby reducing the sick house syndrome and at the same time using a non-halogen flame retardant, while having less harmfulness and superior flame retardancy than wood-based flooring. It is possible to provide a flooring material, and to provide a resin composition for a flame retardant flooring material that significantly reduces the type and amount of harmful substances generated during combustion.

According to the present invention, the melt flow index comprises 100 parts by weight of a polypropylene resin having a melt flow index of 0.3 to 30 g / 10 minutes and 5 to 200 parts by weight of an inorganic filler selected from the group consisting of olastonite, glass fiber, wood flour and chaff. A resin composition for flooring is provided.

The polypropylene resin used in the resin composition of the present invention is characterized in that the melt flow index is 0.3 ~ 30g / 10 minutes. If the melt flow index is less than 0.3g / 10 minutes, the flowability of the resin is lowered and the workability is worsened. If the melt flow index is more than 30g / 10 minutes, the mechanical properties of the resin are lowered.

As the polypropylene resin, polypropylene homopolymer resin or polypropylene copolymer resin having an ethylene content of 30% by weight or less may be used. In the case of the polypropylene copolymer resin, when the ethylene content exceeds 30% by weight, the flexural rigidity of the resin is lowered and the viscosity of the resin is increased, so that workability in a kneader or an extruder when the resin composition is prepared is lowered.

The inorganic filler used in the resin composition of the present invention is at least one selected from the group consisting of olastonite, glass fiber, wood flour and chaff, and contains 5 to 200 parts by weight based on 100 parts by weight of the polypropylene resin. If the content is less than 5 parts by weight, the balance expression effect of the physical properties through the impact strength reinforcement is lowered, and if it exceeds 200 parts by weight, there is a disadvantage in that kneading property and workability are lowered.

Among the inorganic fillers used in the resin composition of the present invention, the ololastonite has an average particle diameter of 4 to 5 µm, a length of 60 to 120 µm, and a biaxial ratio of 3: 1 to 20: 1. It is preferable in view of improvement and improvement of scratch resistance.

Among the inorganic fillers used in the resin composition of the present invention, the glass fiber has a chopped strand shape having an average particle diameter of 5 to 15 µm and a length of 1 to 16 mm, and workability such as kneading property. It is preferable in terms of. If the average particle diameter is less than 5 µm, most of the particles are broken during mixing and the rigid expression effect is insufficient. If the average particle diameter exceeds 15 µm, deformation of the molded article deteriorates and the appearance is poor.

Of the inorganic fillers used in the resin composition of the present invention, it is preferable that both the wood powder and the rice hull have an average particle diameter of 10 to 70 µm in view of improving surface properties and improving bending stiffness. When this average particle diameter is less than 10 micrometers, there exists a problem of scattering during mixing, and when it exceeds 70 micrometers, kneading property with resin falls.

In the resin composition of the present invention, a polyethylene resin having a density of 0.94-0.96 g / cm 3 and a melt flow index of 0.05 to 20 g / 10 min, in addition to the above-mentioned components, according to the specific properties required for the flooring manufactured using the same May be included. If the polyethylene resin has a density of less than 0.94 g / cm 3, the flexural rigidity of the resin decreases, and if it exceeds 0.96 g / cm 3, the impact strength decreases. In addition, when the melt flow index of the polyethylene resin is less than 0.05 g / 10 minutes, the flowability of the resin is lowered. If the melt flow index is more than 20 g / 10 minutes, the mechanical properties such as bending rigidity and impact strength of the resin are lowered.

The polyethylene resin further included in the resin composition of the present invention may be further included in various amounts according to specific properties required for the flooring, but preferably 5 to 100 parts by weight based on 100 parts by weight of the polypropylene resin. Amounts are further included in the resin composition of the present invention.

In addition, the non-halogen-based flame retardant and the flame retardant aid may be further included in the resin composition of the present invention in order to impart flame retardancy. The non-halogen-based flame retardant is a flame retardant that satisfies the reduction of human hazards during combustion required for the resin composition of the present invention used for the manufacture of floorings for residential buildings, and when steam is decomposed by high temperature or contact with flames in case of fire. It is a flame retardant that generates only non-flammable gases such as carbon dioxide, nitrogen, and carbonaceous residues, and generates little toxic gases such as corrosive gases or halogen gases.

The flame retardant further included in the resin composition of the present invention is not particularly limited as long as it satisfies the above characteristics, but is not limited to triphenyl phosphate, tri (2,6-dimethylphenyl) phosphate, and tri (2,6-dibutyl butyl). It is preferable that aromatic phosphate esters of phenol structure such as phenyl) phosphate or the like be used alone or in admixture with ammonium polyphosphate. Moreover, it is preferable that the said flame-retardant has a molecular weight of 1500 or less, and its melting | fusing point is 80 degreeC or more from a viewpoint of a flame retardance provision effect.

When aromatic phosphate ester and ammonium polyphosphate are mixed and used as the flame retardant, the mixing ratio of aromatic phosphate ester / ammonium polyphosphate is preferably 0.20 to 5.0 by weight. If the mixing ratio is out of the above range, it is difficult to obtain a sufficient flame retardant effect, and as a result, a large amount of flame retardant is required.

It is preferable that the said flame retardant contained in the resin composition of this invention further contains 5-70 weight part with respect to 100 weight part of said polypropylene resins. If this amount is less than 5 parts by weight, the flame retardant function cannot be exhibited. If it exceeds 70 parts by weight, the heat resistance of the resin composition is lowered.

As the flame retardant aid further included in the resin composition of the present invention, a pentaerythritol-based compound having a polyhydric alcohol group, such as dipentaerythritol and tripentaerythritol, is preferable. The pentaerythritol-based compound is used as a flame retardant because it acts as a char promoter that assists in the generation of char during combustion.

It is preferable that the said flame-retardant aid further contained in the resin composition of this invention contains the amount of 0.1-50 weight part with respect to 100 weight part of said polypropylene resins further. If this amount is less than 0.1 part by weight, the function as a flame retardant aid cannot be exhibited. If it exceeds 50 parts by weight, the heat resistance of the resin composition is lowered.

The resin composition of the present invention may further include other additives conventionally used in the preparation of the resin composition for flooring, in addition to the above components, within the scope of achieving the object of the present invention.

The resin composition of the present invention may be prepared by mixing the resin and the inorganic filler as described above, and optionally, a flame retardant, a flame retardant aid and other additives using a kneader or banbury mixer or the like at a temperature above the resin melting point. Can be.

The resin composition of the present invention can be processed into pellets by the following specific method. First, the resin composition prepared as described above is transferred from a kneader to an extruder hopper and directly added to a molten state or cooled, and the solidified resin composition is pulverized to an appropriate size with a resin grinder to a solid state. Put into the extruder. Upon completion of the dosing, the resin composition is extruded into pellets using a single-screw or twin-screw extruder for resin. At this time, the extrusion temperature should be selected above the melting point of the resin and below the decomposition temperature of the flame retardant, and is preferably extruded at a temperature of 120 ~ 230 ℃. If the extrusion temperature is lower than 120 ° C, the resin will not be sufficiently melted and the resin melt pressure will be excessively increased, making extrusion difficult. If the extrusion temperature is higher than 230 ° C, the resin will be easily melted but the flame retardant will be decomposed. This is because the flame retardant effect of the is lowered. The pellets thus produced are sufficiently dried using a dryer, so that the resin composition for flooring of the present invention can be produced in pellet form.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the scope of the present invention is not limited by these examples and comparative examples.

Examples 1-20

The resin composition of each Example was prepared by mixing the components as shown in Table 1 using a half-barrier mixer at about 150 ° C. at a content ratio as shown in Table 1 below. Next, the resin composition prepared by using a twin screw extruder was pelletized at a temperature of about 160 ° C., and the resulting pellets were introduced into a mold in an appropriate amount, at about 160 ° C., under high temperature and pressure of about 550 kgf / cm 2. It was molded for 30 minutes by compression molding. The amount of formaldehyde released was measured according to KSF3111 using the resin composition sheet thus prepared. In addition, as a flame retardancy evaluation, the UL Subject 94 (Underwriters Laboratories Incorporation) "combustibility test of plastic materials for mechanical parts" vertical combustion test was performed in the vertical phase (V0). The specimen used was 1/32 inch thick.

The measured formaldehyde emission and flame retardancy evaluation results are shown in Table 2 for each example.

Comparative Examples 1 to 3

As Comparative Examples 1 to 3, commercially available solid wood floors, plywood floors, and reinforced floors were measured in accordance with KSF3111 in the same manner as in Examples 1 to 20, respectively. "Combustibility Test of Plastic Material for Mechanical Components" A vertical combustion test was carried out in the vertical phase (V0). The specimen used was 1/32 inch thick.

The measured formaldehyde emission and flame retardancy evaluation results are shown in Table 2 for each comparative example.

[Table 1] Unit of content (parts by weight)

PP PE A1 A2 A3 A4 F1 F2 Example EL content / MI content Density / MI content content content content content content content One 0 / 0.3 95 - - 5 - - - - - 2 30/30 95 - - 5 - - - - - 3 0 / 0.3 47.5 0.94 / 0.05 47.5 5 - - - - - 4 10/5 84.9 - - 5 - - - 10 0.1 5 10/5 84.9 - - - 5 - - 10 0.1 6 10/5 84.9 - - - - 5 - 10 0.1 7 10/5 84.9 - - - - - 5 10 0.1 8 10/5 45 - - 10 - - - 30 15 9 10/5 45 - - - 10 - - 30 15 10 10/5 45 - - - - 10 - 30 15 11 10/5 45 - - - - - 10 30 15 12 10/20 30 - - 50 - - - 10 10 13 10/20 30 - - - 50 - - 10 10 14 10/20 30 - - - - 50 - 10 10 15 10/20 30 - - - - - 50 10 10 16 10/20 20 0.96 / 20 20 - - 20 - 10 10 17 10/20 20 0.96 / 20 20 - - - 20 10 10 18 10/20 60 - - - - 10 10 10 10 19 10/20 60 - - 5 5 5 5 10 10 20 10/20 60 - - 10 10 0 0 10 10

 Note) PP: Polypropylene Resin

EL content: Ethylene content (% by weight) in polypropylene copolymer resin

MI: melt flow index (g / 10 min)

PE: polyethylene resin

Density: density of polyethylene resin (g / cm 3)

A1: Olastonite (average particle diameter 5 micrometers, length 100 micrometers, biaxial ratio 20: 1)

A2: glass fiber (average particle diameter 10㎛, length 5mm)

A3: wood flour (average particle size 20㎛)

A4: rice husk (average particle size 20㎛)

F1: Flame Retardant SUMISAFE P (Sumitomo Chemical)

F2: Flame Retardant

TABLE 2

Formaldehyde Release (mg / ㎡h) Flame Retardant Grade (UL)  Example 1 to 3  0 radish 4 ~ 7 V-2 8 ~ 11 V-0 12-20 V-1  Comparative example 1 (wood floor) 0.7  radish 2 (plywood floor) 0.8 3 (reinforced floor) 1.1

As can be seen from the results shown in Table 2, the amount of formaldehyde emission of Examples 1 to 20 were all 0 mg / m 2h, which is 5 kvar (0.03 mg / m 2 h or less) of the Ministry of Environment-friendly building materials quality certification ) Was equivalent to.

As can be seen from the above, the resin composition for flooring according to the present invention is suitable as a flooring material for reducing the sick house syndrome by hardly releasing harmful volatile organic compounds such as formaldehyde. In addition, the resin composition for flooring according to the present invention may further include a non-halogen-based flame retardant to improve the flammability which is a disadvantage of wood-based flooring.

Claims (9)

A resin composition for flooring, comprising 100 parts by weight of a polypropylene resin having a melt flow index of 0.3 to 30 g / 10 minutes and 5 to 200 parts by weight of an inorganic filler selected from the group consisting of olastonite, glass fiber, wood flour and chaff. The resin composition for flooring according to claim 1, wherein the polypropylene resin is a polypropylene homopolymer resin or a polypropylene copolymer resin having an ethylene content of 30 wt% or less. 2. The resin composition for flooring according to claim 1, wherein the olistonite has an average particle diameter of 4 to 5 mu m, a length of 60 to 120 mu m, and a biaxial ratio of 3: 1 to 20: 1. The resin composition for flooring according to claim 1, wherein the glass fiber is in the form of a chopped strand having an average particle diameter of 5 to 15 µm and a length of 1 to 16 mm. The resin composition for flooring according to claim 1, wherein both the wood powder and the rice hull have an average particle diameter of 10 to 70 µm. The resin composition for flooring according to claim 1, further comprising 5 to 100 parts by weight of polyethylene resin having a density of 0.94 to 0.96 g / cm 3 and a melt flow index of 0.05 to 20 g / 10 minutes. The resin composition for flooring according to any one of claims 1 to 6, further comprising 5 to 70 parts by weight of a non-halogen flame retardant and 0.1 to 50 parts by weight of a flame retardant aid. The resin composition for flooring according to claim 7, wherein the non-halogen flame retardant is an aromatic phosphate ester compound alone or a mixture of an aromatic phosphate ester compound and ammonium polyphosphate. The resin composition for flooring according to claim 7, wherein the flame retardant aid is a pentaerythritol-based compound.