CN101440202A - Halogen-free flame-retardant reinforced polyytrimethylene terephthalate composite material and preparation thereof - Google Patents

Abstract

The invention relates to a halogen-free flame-retardant reinforced poly(butylene terephthalate) composite material, which is characterized in that the halogen-free flame-retardant reinforced poly(butylene terephthalate) composite material is prepared by mixing the following raw materials by weight percentage: 40 to 80 percent of PBT, 5 to 20 percent of halogen-free flame retardant, 1 to 10 percent of compatilizer, 10 to 40 percent of glass fibers and 0.1 to 1 percent of antioxidant. The method for preparing the halogen-free flame-retardant reinforced poly(butylene terephthalate) composite material comprises: weighing the raw materials according to the weight percentage; placing raw materials except the glass fibers into a high-speed mixer and mixing the raw materials for 2 to 5 minutes; discharging the mixed raw materials; and adding the glass fibers into the mixed raw materials and using a screw compressor for extrusion and granulation, wherein the rotating speed of the screw compressor is between 180 and 600 revolutions per minute, and the temperature is between 230 and 250 DEG C. The halogen-free flame-retardant reinforced poly(butylene terephthalate) composite material has the advantages that the halogen-free flame-retardant reinforced poly(butylene terephthalate) composite material has high-efficiency flame retardant property, good rigidity, high heat resistance and good dimensional stability, does not contain halogen, and is really environment-friendly and flame-retardant, and the flame retardant rating of the halogen-free flame-retardant reinforced poly(butylene terephthalate) composite material can reach V0 rating of the UL94 standard.

Description

A kind of halogen-free flame-proof reinforced poly butylene terephthalate matrix material and preparation method

Technical field

The present invention relates to a kind of halogen-free flame-proof reinforced poly butylene terephthalate matrix material and preparation method, relate in particular to and a kind ofly be applicable to that environmental requirement height, injection moulding have the engineering materials goods of fire-retardant enhancing requirement, the PBT that is suitable for processing low-voltage vacuum contactor, isolating switch, low-tension switch, the electric element of thin-walled etc. is material modified, belongs to the modified poly ester technical field.

Technical background

Polybutylene terephthalate PBT be poly terephthalic acid and butyleneglycol through copolymerization and thermoplastic polyester, has good mechanical property, resistance toheat and chemical resistance, also having favorable rigidity and dimensional stability through glass fibre enhanced PBT material, is very good a kind of new polyester material of 21st century.

Along with developing rapidly of the electric industry of China, the input energetically of capital construction, growing for the demand of fire-retardant enhancement engineering material.All need to have the engineering plastics of good comprehensive mechanical property, flame retardant properties and electrical insulation capability as low-voltage vacuum contactor, isolating switch, low-tension switch, the electric element of thin-walled etc., and wherein with the consumption maximum of polyester material.Fire-retardant polybutylene terephthalate PBT is present most widely used flame-retardant polyester material.Yet the bromine residual volume of traditional prepared PBT of flame resistant method is more, and along with people's environmental consciousness strengthens gradually, halogen-containing fire retardant more and more is restricted.

Summary of the invention

The object of the present invention is to provide to have high efficiency flame retardance, not halogen-containing, can be used for a kind of halogen-free flame-proof reinforced poly butylene terephthalate matrix material and the preparation method of various low-voltage apparatus materials.

For realizing above purpose, technical scheme of the present invention provides a kind of halogen-free flame-proof reinforced poly butylene terephthalate matrix material, it is characterized in that, is mixed by following raw materials by weight percent and forms:

PBT 40—80％、

Halogen-free flame retardants 5-10%,

Compatilizer 1-10%,

Glass fibre 10-40%,

Oxidation inhibitor 0.1-1%,

Wherein the relative viscosity of PBT section is 0.6-0.9PaS, halogen-free flame retardants is organic Hypophosporous Acid, 50 fat, and it is Powdered to be white in color, and compatilizer is an ethylene-acrylate grafting methyl propenoic acid glycidyl fat, its melting index is 5-10g/10min, fusing point is 60 ℃, and glass fibre is an alkali free glass fibre, and handle through silane coupling agent on its surface, oxidation inhibitor is Hinered phenols antioxidant, can be 1010, also can be composite with phosphite ester kind antioxidant, be 1010/168 of proportioning 1:1.

Preparation technology of the present invention is:

The first step. weigh raw material by weight percentage;

Second step. remove glass fibre, other raw materials were put into high-speed mixer and mixing 2-5 minute;

The 3rd step. discharging;

The 4th step. raw materials mixed is added glass fibre screw rod machine extruding pelletization, and the rotating speed of screw rod machine is 180-600 rev/mins, and temperature is 230-250 ℃.

Organic Hypophosporous Acid, 50 fat non-halogen flame retardant is to reach fire-retardant effect by expansion; the foam and the cross linkage of thermoplastics material are exposed on the flame; and in stable burning of surface formation; this protective layer plays a heat insulation effect; reduce under the polymer drops that enters and prevent to melt of oxygen, it has given the PBT polymkeric substance good physical and mechanical property.

The adding of glass fibre can improve the comprehensive mechanical property of PBT significantly, makes material can reach the engineering level and uses.

The adding of compatilizer can improve the adhesive capacity of polymkeric substance and fire retardant and glass fibre, and making respectively is on good terms obtains better dispersion effect, and performance is synergy better.

Oxidation inhibitor makes PBT have good processing stability in the course of processing, avoids color and luster, performance to change.

The present invention adopts PBT as matrix resin, makes a kind of halogen-free flame-proof reinforced poly butylene terephthalate PBT matrix material, is the good modified PBT material of a kind of highly effective flame-retardant, mechanical property.

Advantage of the present invention is to adopt halogen-free flame retardants, has excellent electrical insulation capability and flame retardant properties, and flame retardant rating can reach the VO level of UL94 standard, has extraordinary rigidity simultaneously, height is heat-resisting, dimensional stability good, can satisfy the performance requriements of low-voltage apparatus.

Specific embodiments

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

Embodiment 1 and 2: with the PBT matrix resin, organic Hypophosporous Acid, 50 fat is fire retardant, and compatilizer is an ethylene-acrylate grafting methyl propenoic acid glycidyl fat.

Proportioning 1-2 (weight %) (table 1)

Material name	Proportioning 1	Proportioning 2
			PBT	58	45
Organic Hypophosporous Acid, 50 fat	18	20
			Compatilizer	3.5	4.5
Alkali free glass fibre	20	30
			Oxidation inhibitor is 1010/168 (1:1)	0.5	0.5

Said components was put into high-speed mixer and mixing 4 minutes in proportion except that glass fibre, add glass fibre screw extrusion press extruding pelletization then, processing temperature is at 240 ℃, and the screw rod revolution is at 450 rev/mins, and the processing temperature in each district is:

One district	Two districts	Three districts	Four districts	Five districts	Six districts	Seven districts	Eight districts	Nine districts	Ten districts
										230℃	240℃	250℃	250℃	250℃	250℃	250℃	245℃	245℃	245℃

A kind of halogen-free flame-proof reinforced poly butylene terephthalate (PBT) composite property contrast to embodiment 1 and embodiment 2 gained:

Mechanical property is according to the ASTM testing standard, and flame retardant properties is according to the UL94 standard.

Test performance contrast (table 2)

Project	Embodiment 1	Embodiment 2	PBT
				Tensile strength MPa	82	95	80
Flexural strength MPa	110	120	100
				Modulus in flexure MPa	5250	6580	5150
Shock strength J/M	65	80	60
				UL94	V-O	V-O	Not fire-retardant

Claims (7)

1. a halogen-free flame-proof reinforced poly butylene terephthalate matrix material is characterized in that, is mixed by following raw materials by weight percent and forms:

PBT 40—80％、

Halogen-free flame retardants 5-20%,

Compatilizer 1-10%,

Glass fibre 10-40%,

Oxidation inhibitor 0.1-1%.

2. a kind of halogen-free flame-proof reinforced poly butylene terephthalate matrix material according to claim 1 is characterized in that, the relative viscosity of described PBT section is 0.6-0.9PaS.

3. a kind of halogen-free flame-proof reinforced poly butylene terephthalate matrix material according to claim 1 is characterized in that described halogen-free flame retardants is organic Hypophosporous Acid, 50 fat, and it is Powdered to be white in color.

4. a kind of halogen-free flame-proof reinforced poly butylene terephthalate matrix material according to claim 1, it is characterized in that, described compatilizer is an ethylene-acrylate grafting methyl propenoic acid glycidyl fat, and its melting index is 5-10g/10min, and fusing point is 60 ℃.

5. a kind of halogen-free flame-proof reinforced poly butylene terephthalate matrix material according to claim 1 is characterized in that described glass fibre is an alkali free glass fibre, and handle through silane coupling agent on its surface.

6. a kind of halogen-free flame-proof reinforced poly butylene terephthalate matrix material according to claim 1 is characterized in that described oxidation inhibitor is Hinered phenols antioxidant, is 1010, or composite with phosphite ester kind antioxidant, is 1010/168 of proportioning 1:1.

7. the preparation of a kind of halogen-free flame-proof reinforced poly butylene terephthalate matrix material according to claim 1 is characterized in that, its preparation technology is:

The first step. weigh raw material by weight percentage;

Second step. remove glass fibre, other raw materials were put into high-speed mixer and mixing 2-5 minute;

The 3rd step. discharging;

The 4th step. raw materials mixed is added glass fibre screw rod machine extruding pelletization, and the rotating speed of screw rod machine is 180-600 rev/mins, and temperature is 230-250 ℃.