CN1990533A - Halogen-free flame-proof toughening polypropylene composition and preparation process thereof - Google Patents

Abstract

The invention relates to a combination of halgeon-free flame retardant toughening polypropylene and the method for preparing the same. The combination is characterized in that it comprises raw materials with their proportion as follows: polypropylene 40- 70%, flame retardant 10- 40%, toughening agent 5- 20%, compatibilizer 1- 10%, and oxidation resistant agent 0.1- 1%. The method is characterized in that it comprises following steps: employsing one- step process, measuring raw material according to proportion by weight and mixing them in high speed mixing machine; discharging; and putting mixted raw material into screw compressor for granulation. The invention is characterized by employment of halgeon- free flame retardant, which is not harm to environment and human health, and the flame retardant grade reaches to VO class of UL94 standard.

Description

Halogen-free flame-proof toughening polypropylene composition and preparation method

Technical field

The present invention relates to a kind of halogen-free flame-proof toughening polypropylene composition and preparation method, it has flame retardant properties and shock resistance efficiently, and the polymer product that can be used for electrical and electronic component and environmental requirement is arranged belongs to the modified polypropene technical field.

Background technology

Polypropylene is a kind of general-purpose plastics, is widely used in various electrical and electronic components.But the used fire retardant nearly 80% of present polypropylene flame redardant is a halogen containing flame-retardant, be that brominated flame-retardant efficient height, the consumption of representative is few particularly with polybromodiphenyl ether and polybrominated biphenyl material, performance impact to material is little, and it is moderate, its usefulness can be equal to than non-other fire retardants with price, so 70%～80% all uses this based flame retardant in the electric for export series products of China.But bromide fire retardant is subjected to the puzzlement of dioxin problem in recent years, can generate a large amount of flue dust and corrosive gases with the fire-retardant macromolecular material of its bromo-antimony system when thermo-cracking and the burning simultaneously, and static resistance is not strong, and at present European Union and Japan put into effect in succession that it is forbidden by decree to and use this type of fire retardant.

Because polypropylene flame redardant has added a large amount of fire retardants, makes the material property embrittlement, the resistance to impact shock of material is often very low.

Summary of the invention

The object of the present invention is to provide a kind of existing flame retardant properties and be halogen-free flameproof, very high impact resistance is arranged again, be applicable to the halogen-free flame-proof toughening polypropylene composition and the preparation method of electrical and electronic component.

For realizing above purpose, technical scheme of the present invention provides a kind of halogen-free flame-proof toughening polypropylene composition, it is characterized in that, it is made by following materials of weight proportions:

Polypropylene 30-60%

Fire retardant 10-40%,

Toughner 5-20%,

Compatilizer 1-10%,

Oxidation inhibitor 0.1-1%.

Described polypropylene is Co-polypropylene, homo-polypropylene, can be single also can be blended, its melting index is 0.8-40g/10min;

Described fire retardant is an ammonium polyphosphate;

Described toughner is POE, is POE;

Described compatilizer is the oligopolymer of the graft polymerization of polypropylene grafted unsaturated acid or acid anhydrides, is PP-g-MAH, and its melting index is 1-150g/10min, and percentage of grafting is 0.5-1%;

Described oxidation inhibitor is Hinered phenols antioxidant, is 1010, also can be composite with phosphite ester kind antioxidant 168, and be 1010/168 (1: 1).

A kind of preparation method of halogen-free flame-proof toughening polypropylene composition is characterized in that, adopts one-step technology, and its method is as follows:

(1) weighs raw material by weight ratio;

(2) all raw materials are put into high-speed mixer and mixing 2-5 minute;

(3) discharging;

(4) raw materials mixed is placed screw rod machine extruding pelletization, the rotating speed of screw rod machine is 180-600 rev/min, and temperature is 160-240 ℃.

Fire retardant is that a kind of phosphorus is inorganic combustion inhibitor, is one of main component of expansion type flame retardant (IFR), and expansion type flame retardant is made up of carbon source, acid source and source of the gas, and its activeconstituents is phosphorus and nitrogen.It is different with halogen containing flame-retardant, does not need and weisspiessglanz and usefulness, and the polypropylene that has added fire retardant is when burning; surface energy forms one deck expansion charcoal layer; fire-retardant, heat insulation, the secluding air of this charcoal layer, smog is few, also is difficult for forming poisonous and corrosive gases; and there is not the molten drop phenomenon; the development trend that meets current fire retardant halogen-free environmentalization, the adding of char-forming agent can produce synergy with fire retardant; easier formation expansion charcoal layer reaches better flame retardant effect.

Toughner can improve the shock resistance of material significantly.

Compatilizer can improve the dispersion of fire retardant in resin, the time flame retardant properties more stable.Can improve simultaneously the comprehensive mechanical performance of material.

Oxidation inhibitor makes polypropylene that good processing stability be arranged in the course of processing, avoids color and luster, performance to change.

The present invention adopts polypropylene as matrix resin, makes a kind of halogen-free flameproof and toughness reinforcing flame-proof polypropelene composition.

Advantage of the present invention is to adopt halogen-free flame retardants, has excellent flame-retardant, does not endanger environment and health of human body, and flame retardant rating reaches the V0 level of UL94 standard, though added a large amount of fire retardants, its toughness is very high.

Specific embodiments

Below in conjunction with embodiment, the present invention is described in further detail:

Embodiment 1 and 2

With the polypropylene is matrix resin, and ammonium polyphosphate is a fire retardant, and compatilizer is polypropylene grafted maleic anhydride PP-g-MAH, and toughner is POE.

Embodiment 1 and 2 proportioning (weight %) (table 1)

Material name	Proportioning 1	Proportioning 2
			Co-polypropylene	50	60
Ammonium polyphosphate	30	25
			POE	15	10
PP-g-MAH	4.5	4.5
			1010/168(1∶1)	0.5	0.5

All raw materials were put into high-speed mixer and mixing 4 minutes, and discharging places screw rod machine extruding pelletization with raw materials mixed, and the rotating speed of screw rod machine is 450 rev/mins, and temperature is 200 ℃, obtains halogen-free flame-proof toughening polypropylene composition.

The halogen-free flame-proof toughening polypropylene composition performance of embodiment 1 and embodiment 2 gained is pressed following standard testing: mechanical property is according to the ASTM standard, and flame retardant properties is according to the UL94 standard.

Sample 1 and sample 2 performance synopsis (table 2)

Project	Embodiment 1	Embodiment 2
			Tensile strength MPa	23.5	28.5
Flexural strength MPa	32.5	40
			Modulus in flexure MPa	1613.5	1905.9
Shock strength J/M	78	55
			UL94	V-0	V-0

Claims (7)

1. a halogen-free flame-proof toughening polypropylene composition is characterized in that, is made by following materials of weight proportions:

Polypropylene 30-60%,

Fire retardant 10-40%,

Toughner 5-20%,

Compatilizer 1-10%,

Oxidation inhibitor 0.1-1%.

2. halogen-free flame-proof toughening polypropylene composition according to claim 1 is characterized in that, described polypropylene is Co-polypropylene, homo-polypropylene, can be single also can be blended, its melting index is 0.8-40g/10min.

3. halogen-free flame-proof toughening polypropylene composition according to claim 1 is characterized in that, described fire retardant is an ammonium polyphosphate.

4. halogen-free flame-proof toughening polypropylene composition according to claim 1 is characterized in that, described toughner is POE, is POE.

5. halogen-free flame-proof toughening polypropylene composition according to claim 1, it is characterized in that described compatilizer is the oligopolymer of the graft polymerization of polypropylene grafted unsaturated acid or acid anhydrides, is PP-g-MAH, its melting index is 1-150g/10min, and percentage of grafting is 0.5-1%.

6. halogen-free flame-proof toughening polypropylene composition according to claim 1 is characterized in that described oxidation inhibitor is Hinered phenols antioxidant, is 1010, also can be composite with phosphite ester kind antioxidant 168, and be 1010/168 (1: 1).

7. the preparation method of a kind of halogen-free flame-proof toughening polypropylene composition according to claim 1 is characterized in that, adopts one-step technology, and its method is as follows:

(1) weighs raw material by weight ratio;

(2) all raw materials are put into high-speed mixer and mixing 2-5 minute;

(3) discharging;

(4) raw materials mixed is placed screw rod machine extruding pelletization, the rotating speed of screw rod machine is 180-600 rev/min, and temperature is 160-240 ℃.