CN101440203A - Environment-protective flame-retardant reinforced polyethylene glycol terephthalate resin composition and preparation thereof - Google Patents

Abstract

The invention relates to a environment-friendly and flame-retardant reinforced poly(ethylene terephthalate) resin composition, which is characterized in that the environment-friendly and flame-retardant reinforced poly(ethylene terephthalate) resin composition is prepared by mixing the following compositions by weight percentage: 45 to 71 percent of PET, 10 to 20 percent of red phosphorus master batch, 4 to 10 percent of compatilizer, 15 to 35 percent of glass fibers, 0.1 to 1 percent of antioxidant, 0.1 to 1 percent of lubricant and 0.1 to 1 percent of drip-proof agent. The technology for preparing the environment-friendly and flame-retardant reinforced poly(ethylene terephthalate) resin composition 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 250 and 280 DEG C. The environment-friendly and flame-retardant reinforced poly(ethylene terephthalate) resin composition has the advantages of high-efficiency flame retardant property, good rigidity, greatly improved heat resistance and good dimensional stability, and the flame retardant rating of the environment-friendly and flame-retardant reinforced poly(ethylene terephthalate) resin composition can reach V0 rating of the UL94 standard.

Description

A kind of environmental protection flame retardant strengthens polyethylene terephthalate resin composition and preparation method

Technical field

The present invention relates to a kind of environmental protection flame retardant and strengthen polyethylene terephthalate resin composition and preparation method, relate in particular to and a kind ofly be applicable to that injection moulding has the engineering materials goods of fire-retardant enhancing requirement, the PET that is suitable for 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

Polyethylene terephthalate resin PET be poly terephthalic acid and ethylene glycol through copolymerization and thermoplastic polyester, has good mechanical property, resistance toheat and chemical resistance, through glass fibre enhanced PET, also having favorable rigidity and dimensional stability, 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.The engineering plastics that all need to have 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, PET is in intensity, rigidity, aspect of performances such as hardness are all good than PBT, and have price advantage.

Polyethylene terephthalate has good physics, mechanical property, tensile strength height for example, and excellent in abrasion resistance, rigidity is big, and chemical-resistant resistance and oil-proofness are good, are widely used in various electronic electric equipments and household appliances.Because the present used fire retardant nearly 80% of fire-retardant polyethylene terephthalate 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/price can be equal to than non-other fire retardants, so 70%～80% all uses this based flame retardant in China's electric series products for export.But bromide fire retardant is subjected to the puzzlement of dioxin problem in recent years, use its (bromo-antimony system) fire-retardant macromolecular material the time can generate a large amount of flue dust and corrosive gases simultaneously, at present European Union and Japan this based flame retardant of use of putting into effect in succession that it is forbidden by decree in thermo-cracking and burning.European Union has risen on July 1st, 2006 and has implemented in full the ROHS instruction, and the electronic and electrical equipment that this decree requires to throw in European Union must not contain poly-dibromodiphenyl ether, poly-bromo biphenyl, and this decree has seriously restricted the outlet of China's electronic and electrical equipment.

Summary of the invention

The object of the present invention is to provide a kind of environment-friendly high-efficiency flame retardant properties that has, good comprehensive mechanical property, the environmental protection flame retardant that satisfies the ROHS of European Union command request simultaneously strengthens polyethylene terephthalate resin composition and preparation method.

For realizing above purpose, technical scheme of the present invention provides a kind of environmental protection flame retardant and strengthens the polyethylene terephthalate resin composition, it is characterized in that, is mixed by following raw materials by weight percent and forms:

PET 45—71％、

Red phosphorus master batch 10-20%,

Compatilizer 4-10%,

Glass fibre 15-35%,

Dripping inhibitor 0.1-1%,

Oxidation inhibitor 0.1-1%,

Lubricant 0.1-1%.

Wherein the red phosphorus master batch is for being matrix with the polyethylene terephthalate resin, and red phosphorus content is the master batch of 30-65%; Compatible toughening agents is an ethylene-acrylate grafting methyl propenoic acid glycidyl fat, and its melting index is 5-10g/10min, and fusing point is 60 ℃; Glass fibre is an alkali free glass fibre, and handle through silane coupling agent on its surface; Oxidation inhibitor is Hinered phenols antioxidant, is 245, or composite with phosphite ester kind antioxidant, is 245/2777 of proportioning 2:1; Dripping inhibitor is a tetrafluoroethylene, and lubricant is MB-4.

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 250-280 ℃.

In combustion processes, not producing poisonous, obnoxious flavour with the fire-retardant polyethylene terephthalate of red phosphorus, is a class environmental-protection flame-retardant material, and the fire-retardant polyethylene terephthalate of red phosphorus can also farthest keep the electrical insulation capability of material.

The adding of glass fibre can improve the resultant force of polyethylene terephthalate significantly, makes material can reach the engineering level and uses, and can also reduce cost.The adding of compatilizer can improve the adhesive capacity of polymkeric substance and red phosphorus master batch and glass fibre, and making respectively is on good terms obtains better dispersion effect, and performance is synergy better.

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

Advantage of the present invention is to adopt the environment friendly halogen-free fireproof agent, has abandoned traditional bromo-antimony flame-retardant system, has excellent flame-retardant, does not endanger environment and health of human body, belongs to environmentfriendly products.

Specific embodiments

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

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

Embodiment 1 and 2: polyethylene terephthalate is a matrix resin, and the red phosphorus master batch is a fire retardant, and compatilizer is an ethylene-acrylate grafting methyl propenoic acid glycidyl fat (AX8900).

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

Material name	Proportioning 1	Proportioning 2
			PET	59.5	47.5
The red phosphorus master batch	15	15
			AX8900	4	6
Alkali free glass fibre	20	30
			Dripping inhibitor (PTFE)	0.5	0.5
Lubricant (MB-4).	0.4	0.4
			Oxidation inhibitor is 245/2777 (2: 1)	0.6	0.6

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, the screw rod revolution is at 450 rev/mins, and each is distinguished processing temperature and is: (unit ℃)

One district	Two districts	Three districts	Four districts	Five districts	Six districts	Seven districts	Eight districts	Nine districts	Ten districts
										250	255	260	260	260	260	260	260	260	260

A kind of environmental protection flame retardant to embodiment 1 and embodiment 2 gained strengthens polyethylene terephthalate resin composition properties and traditional bromo-antimony flame-retardant system contrast:

Mechanics Performance Testing is according to the ASTM standard, and flame retardant properties is tested according to the UL94 standard.

Test performance contrast (table 2)

Project	Embodiment 1	Embodiment 2	Bromo-antimony flame-retardant system
				Tensile strength (MPa)	52.4	56.1	51.8
Flexural strength (MPa)	79.6	84.4	78.9
				Modulus in flexure MPa	5831.2	6463.4.7	5687.2
Shock strength (J/M)	42.2	40.7	38.1
				Flame retardant resistance	VO	VO	VO

Claims (8)

1. an environmental protection flame retardant strengthens the polyethylene terephthalate resin composition, it is characterized in that, is mixed by following raw materials by weight percent and forms:

PET 45—71％、

Red phosphorus master batch 10-20%,

Compatilizer 4-10%,

Glass fibre 14-35%,

Dripping inhibitor 0.1-1%,

Oxidation inhibitor 0.1-1%,

Lubricant 0.1-1%.

2. a kind of environmental protection flame retardant according to claim 1 strengthens the polyethylene terephthalate resin composition, it is characterized in that described red phosphorus master batch is matrix with the polyethylene terephthalate resin, and red phosphorus content is the master batch of 30-65%.

3. a kind of environmental protection flame retardant according to claim 1 strengthens the polyethylene terephthalate resin composition, 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 ℃.

4. a kind of environmental protection flame retardant according to claim 1 strengthens the polyethylene terephthalate resin composition, it is characterized in that described glass fibre is an alkali free glass fibre, and handle through silane coupling agent on its surface.

5. a kind of environmental protection flame retardant according to claim 1 strengthens the polyethylene terephthalate resin composition, it is characterized in that described oxidation inhibitor is Hinered phenols antioxidant, is 245, or composite with phosphite ester kind antioxidant, is 245/2777 of proportioning 2:1.

6. a kind of environmental protection flame retardant according to claim 1 strengthens the polyethylene terephthalate resin composition, it is characterized in that described dripping inhibitor is a tetrafluoroethylene.

7. a kind of environmental protection flame retardant according to claim 1 strengthens the polyethylene terephthalate resin composition, it is characterized in that described lubricant is MB-4.

8. according to claim 1 have improve environmental protection flame retardant and strengthen polyethylene terephthalate resin preparation of compositions method, it 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 extruding pelletization in the screw rod machine, and the rotating speed of screw rod machine is 180-600 rev/mins, and temperature is 250-280 ℃.