KR20100027316A - Non-halogen flame-retardant polypropylene resin composition having high rigidity - Google Patents

Abstract

PURPOSE: A flame-retardant polypropylene resin composition is provided to reduce the content of a flame retardant by adding non-halogen organic flame retardants, to improve heat resistance and rigidity by adding filler such as glass fiber, and to secure dimensional stability. CONSTITUTION: A non-halogen flame-retardant polypropylene resin composition comprises 10.0~96.9 weight% poly propylene resin, 1.0~40.0 weight% phosphate-based flame retardant, 1.0~10.0 weight% flame-retarding aid, 1.0~30.0 weight% inorganic filler, 0.1~10.0 weight% modified polypropylene as a compatibilizer, or 0.1~10.0 weight% organic silane compound. The phosphate-based flame retardant is ammonium polyphosphate or pre-treated compound thereof.

Description

Non-halogen flame-retardant polypropylene resin composition excellent in rigidity {NON-HALOGEN FLAME-RETARDANT POLYPROPYLENE RESIN COMPOSITION HAVING HIGH RIGIDITY}

The present invention relates to a non-halogen-based flame retardant polypropylene resin composition having excellent rigidity, and more specifically, to prescribe glass fiber or the like to polypropylene resin to enhance heat resistance, and to secure flame retardance through a non-halogen flame retardant having excellent flame resistance and heat stability. The present invention relates to a non-halogen flame-retardant polypropylene resin composition having excellent rigidity.

Polypropylene having excellent heat resistance has been widely used around small heat-resistant home appliances, and flame retardant polypropylene has been widely used to secure safety from fire hazards, especially as safety issues arise.

Recently, as interest in environmental problems has increased, the problem of the existing halogen-based flame retardants has been raised, and replacement with environmentally friendly non-halogen-based flame retardant materials has been required.

On the other hand, non-halogen-based flame retardants have been inferior in flame retardancy and lack of thermal stability as compared to conventional halogen-based flame retardants, which has been an obstacle to expansion of use.

In this regard, in Korean Patent Publication Nos. 2005-0110406 and 2007-0063463, magnesium hydroxide, an inorganic flame retardant, was applied to secure flame retardancy. However, magnesium hydroxide has a conventional halogen-based flame retardancy to secure the same flame retardant grade due to lack of flame retardancy. Compared with the flame retardant, an excessive amount of flame retardant has to be added, and thus, there is a limitation that the degradation of physical properties and processability such as impact strength is inevitable.

The present invention is to solve the problems of the prior art as described above, by reducing the content of the flame retardant by adding a non-halogen-based organic flame retardant, improve the heat resistance and rigidity by adding a filler (glass fiber), etc. It is to provide a flame retardant polypropylene resin composition having a dimensional stability.

The present invention is to solve the above problems, polypropylene resin 10.0 to 96.9% by weight, phosphorus flame retardant 1.0 to 40.0% by weight, flame retardant aid 1.0 to 10.0% by weight, inorganic filler 1.0 to 30.0% by weight, and modified as a compatibilizer It provides a non-halogen flame-retardant polypropylene resin composition comprising 0.1 to 10.0% by weight of polypropylene or 0.1 to 10.0% by weight of the organosilane compound.

In addition, the phosphorus-based flame retardant is characterized in that the ammonium polyphosphate or a pretreatment compound thereof.

In addition, the flame retardant aid is characterized in that tris-to-hydroxy ethyl-isocyanurate.

In addition, the inorganic filler is characterized in that the glass fiber in the form of chopped strands in the range of the average particle diameter of 5 ~ 15㎛, length 1 ~ 16mm.

In addition, the polypropylene resin is characterized in that the crystalline propylene homopolymer or ethylene-propylene copolymer having a melt index of 1 ~ 60g / 10 minutes.

In addition, the modified polypropylene is characterized in that the propylene homopolymer, ethylene-propylene copolymer or propylene / alpha-olefin nonconjugated diene compound copolymer modified by unsaturated carboxylic acid or derivatives thereof.

Non-halogen flame-retardant polypropylene resin composition excellent in rigidity prepared by the present invention provides a polypropylene resin composition excellent in flame retardancy, heat resistance and rigidity, secured dimensional stability, drum washing machine, dishwasher replaced by environmentally friendly materials It is suitable for use as a material for interior parts of home appliances.

Non-halogen flame retardant polypropylene resin composition excellent in rigidity according to the present invention is polypropylene resin 10.0 ~ 96.8% by weight, phosphorus flame retardant 1.0 ~ 40.0% by weight, flame retardant aid 1.0 ~ 10.0% by weight, inorganic filler 1.0 ~ 30.0% by weight, commercialization It is characterized in that it comprises 0.1 to 10.0% by weight of modified polypropylene as a zero.

The polypropylene resin included in the composition of the present invention is preferably a crystalline propylene homopolymer or ethylene-propylene copolymer having a melt index (MI) of 1 to 60 g / 10 minutes (ASTM D1238, 230 ° C). When the melt index is less than 1g / 10 minutes, the moldability of the parts is not good, the productivity is lowered, whereas when the melt index exceeds 60g / 10 minutes, the impact strength is sharply lowered.

The flame retardant used in the present invention is a non-halogen flame retardant is used for imparting flame retardancy of the polypropylene resin composition, specifically, a phosphorus flame retardant is preferable. As the phosphorus flame retardant, it is preferable that ammonium polyphosphate or melamine or the like is used as the pretreatment compound. The use amount is preferably 1.0 to 40.0% by weight. If the content of the flame retardant is less than 1.0% by weight, the flame retardancy may not be sufficiently secured, and when the content of the flame retardant is more than 40.0% by weight, no further flame retardancy improvement effect may be expected, and the physical properties may be reduced and There is a risk of deterioration of workability.

As the flame retardant aid used in the present invention, tris-to-hydroxy ethyl-isocyanurate is used, and the content is preferably 1.0 to 10.0% by weight. If the content of the flame retardant aid is less than 1.0% by weight can not be expected a synergistic effect with the phosphorus-based flame retardant sufficiently, if more than 10.0% by weight can not be expected to further improve the flame retardancy.

As the inorganic filler included in the composition of the present invention, in consideration of the kneading operation, it is preferable to use chopped strand glass fibers having an average particle diameter of 5 to 15 µm and a length of 1 to 16 mm. It is not limited. When the glass fiber has an average particle diameter of less than 5 μm, most of the glass fibers are broken during mixing, so that the rigid expression effect is insufficient, and when the glass fiber exceeds 15 μm, the deformation of the molded article is deteriorated and the appearance is poor. In addition, the content of the inorganic filler is preferably used 1.0 to 30.0% by weight, when the content of the inorganic filler is less than 1.0% by weight the effect of rigid expression is insufficient, when the content exceeds 30.0% by weight extrusion workability is inferior In addition, the appearance of warp is poor due to warpage.

The compatibilizer included in the composition of the present invention is used for improving kneading with polypropylene and an inorganic filler, and specifically, a modified polypropylene or an organosilane compound is preferable.

The modified polypropylene is obtained by modifying a propylene homopolymer, an ethylene / propylene copolymer or a propylene / alpha-olefin nonconjugated diene compound copolymer with an unsaturated carboxylic acid or a derivative thereof, and the content thereof is preferably 0.1 to 10.0% by weight. . When the content of the modified polypropylene is less than 0.1% by weight, the interfacial adhesion between the inorganic filler and the polypropylene resin may not be sufficiently maintained, and when the content of the modified polypropylene is greater than 10.0% by weight, there is no further improvement in physical properties.

In the polypropylene resin composition of the present invention, in addition to the above components, a range of conventional additives such as reinforcing materials, heat stabilizers, weather stabilizers, antistatic agents, lubricants, slip agents, antioxidants, pigments, dyes, and the like do not deviate from the characteristics of the present invention. Specific examples thereof include talc, mica, carbon fiber, calcium carbonate, calcium sulfate, clay, silica, alumina, carbon black, magnesium hydroxide, zeolite, barium sulfate, and the like.

As a method for producing the polypropylene resin composition according to the present invention, it is preferable to knead using a twin screw extruder, and because glass fiber is used as the inorganic filler, glass is sufficiently maintained for maintaining the shape of the glass fiber as is commonly known. It is preferable to mix | blend and manufacture a fiber more than polypropylene melting | fusing point using the manufacturing process which introduces a fiber side by side in the middle of an extruder.

The present invention can be understood in more detail by the following examples, which are only examples for illustrating the present invention, and are not intended to limit the protection scope of the present invention.

Example  1 and Comparative example  1 ~ 2

The polypropylene resin composition of Example 1 and Comparative Examples 1-2 containing the component described below was synthesize | combined.

1) Polypropylene: Highly crystalline polypropylene, Samsung Total, Melt index (MI): 10g / 10min

2) Bromine-based flame retardants: Bis-pentabromophenoxy-ethane, Albemarle, Bromine content 82.3%

3) Phosphorus flame retardant: ammonium polyphosphate, Budenheim, P ₂ O ₅ 68%

4) Flame retardant aid: Tris-to-hydroxy ethyl-isocyanurate, BASF, Mw: 261.2

5) Inorganic filler: glass fiber, NEG, particle size 9 ~ 13㎛ / length 3.0 ~ 4.5mm

6) Modified polypropylene: Modified polypropylene with 100g / 10min of melt melt index containing 0.2% by weight or more of reacted maleic anhydride by weight, Samsung Total

Furtherance Comparative Example-1 Comparative Example-2 Example-1 Polypropylene 66 68 56 Brominated Flame Retardants 25 Phosphorus Flame Retardant 25 25 Antimony trioxide 7 Flame Retardant 5 5 Inorganic filler 12 Modified Polypropylene 2 2 2

With the ingredients and blending ratios shown in Table 1, polypropylene, flame retardant and flame retardant aids, modified polypropylene and stabilizers were dry blended with a Henschel mixer, and then all were added to the hopper of the JSW TEX44 Alpha (ALPHA) twin-screw kneading extruder, The glass fiber was fed into the side feed during the extruder, melt kneaded together in the extruder to produce the copper resin composition, and then injection molding using Samsung Klucner FCM-110 (molding force = 110 tons) was defined in ASTM D790 standard. Flexural strength test specimens, Izod impact strength measurement specimens specified in ASTM D256 standard, and flame retardant specimens specified in UL94 were fabricated.

As a result of flame retardancy evaluation through the UL94 vertical combustion test using the flame retardant specimen specified by UL94, it was confirmed that the flame retardancy of the V-0 grade was secured.

Next, the flexural strength was measured based on ASTM D790 standard, and the Izod impact strength was measured based on the ASTM D256 standard. The measurement results are shown in Table 3 below.

Property item Test Methods unit Comparative Example-1 Comparative Example-2 Example-1 Flexural modulus ASTM D790 kg / cm2 21,600 21,400 32,300 IZOD impact strength ASTM D256 kg cm / cm 2.5 2.4 3.3 Flame Retardant (1/16 ") UL94 Cotton firing none none none evaluation V-0 V-0 V-0

The non-halogen-based flame retardant was applied to the same halogen-based flame retardant as in Example-1 to which glass fiber was added and the halogen-based flame retardant to Comparative Example-1 to which Talc was added. In comparison with Comparative Example-2 containing Talc, excellent physical properties such as flexural modulus and Izod impact strength were obtained.

Claims (6)

10.0 to 96.9% by weight of polypropylene resin, 1.0 to 40.0% by weight of phosphorus flame retardant, 1.0 to 10.0% by weight of flame retardant, 1.0 to 30.0% by weight of inorganic filler, 0.1 to 10.0% by weight of modified polypropylene as compatibilizer or 0.1 to organosilane compound Non-halogen flame retardant polypropylene resin composition comprising 10.0% by weight. The non-halogen-based flame retardant polypropylene resin composition according to claim 1, wherein the phosphorus-based flame retardant is an ammonium polyphosphate shock or a pretreatment compound. The non-halogen flame retardant polypropylene resin composition according to claim 1, wherein the flame retardant aid is tris-to-hydroxy ethyl-isocyanurate. The polypropylene resin composition according to claim 1, wherein the inorganic filler is a glass fiber in the form of chopped strands having an average particle diameter of 5 to 15 µm and a length of 1 to 16 mm. The polypropylene resin composition according to claim 1, wherein the polypropylene resin is a crystalline propylene homopolymer or an ethylene-propylene copolymer having a melt index of 1 to 60 g / 10 minutes. The polypropylene of claim 1, wherein the modified polypropylene is a polypropylene characterized by modifying a propylene homopolymer, an ethylene-propylene copolymer, or a propylene / alpha-olefin nonconjugated diene compound copolymer with an unsaturated carboxylic acid or a derivative thereof. Propylene Resin Composition.