CN104650561A - Flame-retardant toughening and strengthening modified PC/PET alloy and preparation method thereof - Google Patents

Abstract

The invention discloses a flame-retardant toughening and strengthening modified PC/PET alloy and a preparation method thereof. The flame-retardant toughening and strengthening modified PC/PET alloy comprises the following components in percentage by mass: 30-60% of PC, 20-40% of PBT, 5-10% of flame retardant, 3-8% of a toughening agent, 5-10% of nano calcium carbonate, 0.1-1% of triphenyl phosphite, 0.1-0.5% of a coupling agent, 0.1-0.5% of an antioxidant and 0.1-1.5% of a lubricant. By adding a small amount of triphenyl phosphite, the ester exchange reaction between PC and PBT is effectively controlled, and the material loss of PC/PBT is avoided; by adding modifiers such as the flame retardant, the toughening agent and the nano calcium carbonate, the flame-retardant performance, impact strength, tensile strength, bending strength, rigidity, heat resistance and corrosion resistance of the PC/PET alloy system are greatly improved, and the alloy has good processing performance, electric performance and the like.

Description

Fire-retardant toughened enhancing modified PC/PBT Alloy And Preparation Method

Technical field

The present invention relates to technical field of polymer materials, specifically a kind of fire-retardant toughened enhancing modified PC/PBT Alloy And Preparation Method.

Background technology

PC/PBT alloy (polycarbonate/polybutylene terephthalate) has that warpage sex change is little, good stability of the dimension, good fluidity, thermal linear expansion coefficient is little, the features such as chemical solvent resistance energy is excellent, a kind of alloy plastic that industrial using value is higher, can be used for manufacturing collision bumper, automobile door handle, body of a motor car side plate, electrically, electronic equipment part etc.But from polymer aggregational state structure, PC is non-crystalline polymer, and PBT is crystalline polymer, therefore PC/PBT belongs to typically noncrystalline with crystallization co-mixing system, the shock strength that its interface compatibility is bad, affect material, and the low performance requriements with high flame retardant can not be met of flame retardant resistance, this will limit its range of application greatly.Therefore, the modification of the aspects such as fire-retardant, toughness reinforcing, enhancing is carried out to PC/PBT alloy necessary.

Summary of the invention

The object of the present invention is to provide the fire-retardant toughened enhancing modified PC/PBT Alloy And Preparation Method of a kind of good flame resistance, excellent in mechanical performance.

The technical solution adopted for the present invention to solve the technical problems is: fire-retardant toughened enhancing modified PC/PBT alloy, and its component by mass percent proportioning is: PC 30% ~ 60%, PBT 20% ~ 40%, fire retardant 5% ~ 10%, toughner 3% ~ 8%, nano-calcium carbonate 5% ~ 10%, triphenyl phosphite 0.1% ~ 1%, coupling agent 0.1% ~ 0.5%, oxidation inhibitor 0.1% ~ 0.5%, lubricant 0.1% ~ 1.5%.

Described PC is bisphenol A-type aromatic copolycarbonate, and weight-average molecular weight is 20000 ~ 40000g/mol.

Described PBT is polybutylene terephthalate.

Described fire retardant is the polydimethylsiloxane (PDMS) of mass ratio 1:5 and the compound flame retardant of dihydroxyphenyl propane-bis-(diphenyl phosphoester) (BDP).

Described toughner is maleic anhydride grafted ethene-octene copolymer (POE-g-MAH).

Described coupling agent is titanate coupling agents.

Described oxidation inhibitor is the one in the compound of antioxidant 1010, antioxidant 1076, antioxidant 1010 or antioxidant 1076 and irgasfos 168 1:1 in mass ratio.

Described lubricant is pentaerythritol stearate (PETS).

The preparation method of above-mentioned fire-retardant toughened enhancing modified PC/PBT alloy, comprises the following steps:

(1), by PC in blast drier at 110 DEG C ~ 130 DEG C temperature dry 3 ~ 4 hours, PBT at 130 DEG C ~ 150 DEG C dry 3 ~ 4 hours, nano-calcium carbonate at 80 DEG C ~ 85 DEG C dry 30 ~ 45 minutes, stand-by;

(2) take dry nano-calcium carbonate and coupling agent, by weight ratio, add a material temperature degree in the high-speed mixer of 80 DEG C ~ 120 DEG C, after rotating speed 3000 ~ 6000 revs/min stirs 10 ~ 60 minutes, be cooled to lower than 40 DEG C of dischargings stand-by;

(3), dry PC and PBT is taken by weight ratio, and add in high-speed mixer and mix, then the fire retardant, toughner, triphenyl phosphite, oxidation inhibitor, the lubricant that take by weight ratio is added, add the product taking step (2) by weight ratio simultaneously, after making to stir together 15 ~ 30 minutes and reaching and mix, discharging;

(4), the compound of step (3) is added in twin screw extruder, under 250 DEG C ~ 275 DEG C processing temperatures and 250 ~ 450r/min screw speed, by twin screw extruder fully plastify blended after extrude, cooling granulation, get product.

The invention has the beneficial effects as follows, compared with prior art, the present invention adds a small amount of triphenyl phosphite and effectively controls between PC and PBT transesterification reaction occurs, avoid the physical property loss of PC/PBT, simultaneously by adding the properties-correcting agent such as fire retardant, toughner, nano-calcium carbonate, substantially increase the flame retardant properties of PC/PBT alloy system, resistance to impact shock, tensile strength, flexural strength, rigidity and heat-and corrosion-resistant performance, and there are good processing characteristics and electrical property etc.

Embodiment

Technical scheme of the present invention is further illustrated below in conjunction with concrete preferred embodiment.

A kind of fire-retardant toughened enhancing modified PC/PBT alloy, its component by mass percent proportioning is: compound 0.3%, the pentaerythritol stearate (PETS) 1.2% of PC 45%, PBT 27%, fire retardant 10%, maleic anhydride grafted ethene-octene copolymer (POE-g-MAH) 5%, nano-calcium carbonate 10%, triphenyl phosphite 1%, titanate coupling agents 0.5%, antioxidant 1010 and irgasfos 168 1:1 in mass ratio.Wherein, described PC is bisphenol A-type aromatic copolycarbonate, and weight-average molecular weight is 20000 ~ 40000g/mol; Described PBT is polybutylene terephthalate; Described fire retardant is the polydimethylsiloxane (PDMS) of mass ratio 1:5 and the compound flame retardant of dihydroxyphenyl propane-bis-(diphenyl phosphoester) (BDP).

Preparation method: (1), by PC in blast drier at 110 DEG C ~ 130 DEG C temperature dry 3 ~ 4 hours, PBT at 130 DEG C ~ 150 DEG C dry 3 ~ 4 hours, nano-calcium carbonate at 80 DEG C ~ 85 DEG C dry 30 ~ 45 minutes, stand-by; (2) take dry nano-calcium carbonate and titanate coupling agents, by weight ratio, add a material temperature degree in the high-speed mixer of 80 DEG C ~ 120 DEG C, after rotating speed 3000 ~ 6000 revs/min stirs 10 ~ 60 minutes, be cooled to lower than 40 DEG C of dischargings stand-by; (3), dry PC and PBT is taken by weight ratio, and add in high-speed mixer and mix, then compound, the pentaerythritol stearate (PETS) of the fire retardant, maleic anhydride grafted ethene-octene copolymer (POE-g-MAH), triphenyl phosphite, antioxidant 1010 and the irgasfos 168 that take by weight ratio 1:1 is in mass ratio added, add the product taking step (2) by weight ratio simultaneously, after making to stir together 15 ~ 30 minutes and reaching and mix, discharging; (4), the compound of step (3) is added in twin screw extruder, under 250 DEG C ~ 275 DEG C processing temperatures and 250 ~ 450r/min screw speed, by twin screw extruder fully plastify blended after extrude, cooling granulation, get product.

Claims (4)

1. a fire-retardant toughened enhancing modified PC/PBT alloy, it is characterized in that, its component by mass percent proportioning is: PC 30% ~ 60%, PBT 20% ~ 40%, fire retardant 5% ~ 10%, toughner 3% ~ 8%, nano-calcium carbonate 5% ~ 10%, triphenyl phosphite 0.1% ~ 1%, coupling agent 0.1% ~ 0.5%, oxidation inhibitor 0.1% ~ 0.5%, lubricant 0.1% ~ 1.5%.

2. fire-retardant toughened enhancing modified PC/PBT alloy according to claim 1, is characterized in that, described fire retardant is the polydimethylsiloxane (PDMS) of mass ratio 1:5 and the compound flame retardant of dihydroxyphenyl propane-bis-(diphenyl phosphoester) (BDP).

3. fire-retardant toughened enhancing modified PC/PBT alloy according to claim 1, is characterized in that, described toughner is maleic anhydride grafted ethene-octene copolymer (POE-g-MAH).

4. the preparation method of fire-retardant toughened enhancing modified PC/PBT alloy according to claim 1, is characterized in that, comprise the following steps:

(1), by PC in blast drier at 110 DEG C ~ 130 DEG C temperature dry 3 ~ 4 hours, PBT at 130 DEG C ~ 150 DEG C dry 3 ~ 4 hours, nano-calcium carbonate at 80 DEG C ~ 85 DEG C dry 30 ~ 45 minutes, stand-by;

(2) take dry nano-calcium carbonate and coupling agent, by weight ratio, add a material temperature degree in the high-speed mixer of 80 DEG C ~ 120 DEG C, after rotating speed 3000 ~ 6000 revs/min stirs 10 ~ 60 minutes, be cooled to lower than 40 DEG C of dischargings stand-by;

(3), dry PC and PBT is taken by weight ratio, and add in high-speed mixer and mix, then the fire retardant, toughner, triphenyl phosphite, oxidation inhibitor, the lubricant that take by weight ratio is added, add the product taking step (2) by weight ratio simultaneously, after making to stir together 15 ~ 30 minutes and reaching and mix, discharging;

(4), the compound of step (3) is added in twin screw extruder, under 250 DEG C ~ 275 DEG C processing temperatures and 250 ~ 450r/min screw speed, by twin screw extruder fully plastify blended after extrude, cooling granulation, get product.