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Flame-retardant polycarbonate and preparation method thereof

A flame retardant polycarbonate and flame retardant technology, which is applied in the field of flame retardant polycarbonate and its preparation, can solve the problems of inconvenient processing, reduced processing performance, and reduced melt viscosity, so as to suppress dripping and ensure processing Sex, the effect of reducing the amount of addition

Inactive Publication Date: 2019-01-22
NINGBO ZHETIE DAPHOON CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the use of brominated flame retardants has been reduced due to their high toxicity, and the price of sulfonate flame retardants is very expensive, which is not conducive to large-scale industrial production. Halogen-free and environmentally friendly phosphorus-based flame retardants are gradually being widely used. However, no Halogen-friendly phosphorus-based flame retardants are in a liquid state, which brings inconvenience to processing. When the amount added to the base material is high, the cost is high, the mechanical properties and heat resistance of the product are poor, and it is difficult to prepare with a single-component silicon-based flame retardant. Modified PC material with both flame retardancy and comprehensive performance
Moreover, the addition of flame retardants and anti-dripping agents usually reduces the melt viscosity of PC, reduces the processing performance and even makes it impossible to extrude the bars

Method used

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  • Flame-retardant polycarbonate and preparation method thereof
  • Flame-retardant polycarbonate and preparation method thereof
  • Flame-retardant polycarbonate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A kind of flame-retardant polycarbonate, its concrete component and weight are as follows:

[0047] PC–x 100kg; organosilicon-based flame retardant polydimethylsiloxane 0.15kg; into, and the total weight of the two is 0.05kg; the compound antioxidant is 0.6kg; the lubricant is 0.4kg.

[0048] Its preparation method comprises the following steps:

[0049] (1) Dry PC-x: Dry PC-x at 130°C for 6 hours until the water content of PC is lower than 0.01%;

[0050] (2) Prepare the mixture: weigh the dried PC-x and other components according to the above weights in step (1) and put them together in a high mixer and stir for 6 minutes to obtain the mixture;

[0051] (3) Melt extrusion: the mixture prepared in step (2) is sent into a twin-screw extruder with a length-to-diameter ratio of 36:1 for extrusion and granulation, wherein the process conditions for controlling the twin-screw extruder are: 1. The temperature in the zone is 280°C, the temperature in the second zone is 280...

Embodiment 2

[0054] The difference from Example 1 is that PC-x 100kg; organosilicon flame retardant polydimethylsiloxane 0.2kg; sulfonate flame retardant perfluorobutanesulfonate potassium and diphenylsulfone Potassium sulfonate is compounded at a ratio of 1:3, and the total weight of the two is 0.1kg; the compound antioxidant is 1.0kg; the lubricant is 0.8kg.

Embodiment 3

[0056] The difference from Example 1 is that PC-x 100kg; organosilicon flame retardant polydimethylsiloxane 0.2kg; sulfonate flame retardant perfluorobutanesulfonate potassium and diphenylsulfone Potassium sulfonate is compounded at a ratio of 1:3, and the total weight of the two is 0.2kg; the compound antioxidant is 1.5kg; the lubricant is 1.5kg.

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Abstract

The invention provides flame-retardant polycarbonate and a preparation method thereof, and relates to the field of polymer materials. The flame-retardant polycarbonate comprises the following components (by weight): 100 parts of PC-x, 0.2-0.8 part of a composite flame retardant, 0.6-2.5 parts of a compound antioxidant and 0.4-2.5 parts of a lubricant, wherein the molecular structural formula of PC-x is as shown in the specification. The polycarbonate is prepared by the processes of stirring-mixing and melt-extrusion, has an obvious shear thinning effect, and has high melt strength at low shear, which can effectively suppress dripping during combustion to improve the flame retardancy of the resin itself. The high-efficiency composite flame retardant is one of an organosilicon flame retardant and a sulfonate-based flame retardant or formed by compounding more than one of the organosilicon flame retardant and the sulfonate-based flame retardant. By matching the PC-X with a special molecular structure and the high-efficiency composite flame retardant, the oxygen index is significantly improved, the flame retardant performance is excellent, and it is ensured that the product has high transparency, good strength and stiffness and resistance to chemical reagents.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a flame-retardant polycarbonate and a preparation method thereof. Background technique [0002] Polycarbonate (PC) has good transparency, high strength, high rigidity, good dimensional stability, excellent mechanical properties, good impact resistance, high heat distortion temperature, and good creep resistance and coloring. Therefore, it is widely used in aerospace, mechanical transportation, electronic appliances, construction transportation, information storage and many other fields. [0003] Because PC has the characteristics of high decomposition temperature, low heat of combustion and high char formation rate, PC material itself has certain flame retardant properties, but usually PC will melt and drip in the UL94 combustion test, and it only belongs to HB or V- 2 levels. At present, the traditional flame retardant modified PC material is to reduce the combustion performan...

Claims

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Application Information

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IPC IPC(8): C08L69/00C08L83/04C08K5/00C08K5/42C08K5/134C08K5/526C08K5/372
CPCC08K2201/014C08L69/00C08L2201/02C08L2201/08C08L83/04C08K5/00C08K5/42C08K5/1345C08K5/526C08K5/372
Inventor 倪安新邱琪浩张豪杰周浩何燕峰周志峰张尧庆施懿军
Owner NINGBO ZHETIE DAPHOON CHEM
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