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Smoke-inhibition type halogen-free flame-proof polycarbonate

A technology of flame-retardant polycarbonate and polycarbonate, which is applied to polycarbonate with flame-retardant properties, and has high-efficiency smoke suppression. It can solve the problems of high dissolution and reduced smoke suppression effect, and achieve high flame-retardant efficiency and high efficiency. Good smoke suppression effect, environmental friendly effect

Inactive Publication Date: 2009-07-01
HANGZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the surface of the phosphate flame retardant is not effectively coated and modified, the dissolution rate in polycarbonate is relatively large, and the smoke suppression effect of the material is reduced after being placed in the environment for a long time

Method used

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  • Smoke-inhibition type halogen-free flame-proof polycarbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1 Preparation of organopolysiloxane 1

[0024] In a 500ml three-necked flask, add 90g of water and 5g of acetic acid, heat to a predetermined temperature of 60°C, and dropwise add a mixture of 36.6g of diphenyldimethoxysilane and 15.3g of methyltrimethoxysilane with a dropping funnel , It is required to finish dripping in about 20 minutes. Continue to maintain the original temperature, react for 2 hours, then add 3g of trimethylmethoxysilane dropwise to the reaction solution, continue to react for 45min after the dropwise addition, then add 70g of toluene to the reaction solution, cool to room temperature and remove water layer, washed several times with deionized water until neutral, and finally vacuum-distilled with a rotary evaporator to remove solvents and low molecular weight substances to obtain polysiloxane.

Embodiment 2

[0025] Embodiment 2 Preparation of organopolysiloxane 2

[0026] In a 500ml three-necked flask, add 80g of water and 3g of acetic acid, heat to a predetermined temperature of 80°C, and dropwise add 29.7g of phenyltrimethoxysilane, 14.6g of diphenyldimethoxysilane, 12.2 The mixture of g methyltrimethoxysilane is required to be dripped in about 30 minutes. Continue to maintain the original temperature, react for 2 hours, then add 7g of hexamethyldisilazane dropwise to the reaction solution, continue to react for 50min after the dropwise addition, then add 60g of toluene to the reaction solution, cool to room temperature and remove water layer, washed several times with deionized water until neutral, and finally vacuum-distilled with a rotary evaporator to remove solvents and low molecular weight substances to obtain polysiloxane.

Embodiment 3

[0027] Example 3: Preparation of smoke-suppressing halogen-free flame-retardant polycarbonate

[0028] 90 parts by weight of polycarbonate, 7 parts by weight of organopolysiloxane prepared in Example 1, and 3 parts by weight of molybdenum trioxide are premixed in a high-speed mixer; the premix is ​​melted on a twin-screw extruder Extrusion granulation. The temperature of the five intervals of the extruder: the first interval is 240°C, the second interval is 250°C, and the third, fourth, and fifth intervals are 255°C. The rotating speed of the extruder is 200-240r / min, and the feeding amount is 35% of the feeding funnel. It is hot-pressed at 260°C on a hot press, and sampled by a universal prototype machine. Determination of flame retardancy and mechanical properties of flame retardant materials. Test results: the oxygen index is 34, the UL94 vertical burning test reaches V0 level, and the tensile strength is 58.8MPa.

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Abstract

The invention discloses a smoke-suppressing type halogen-free flame-retardant polycarbonate, which comprises: 75-98 parts by weight of aromatic polycarbonate or polyester carbonate; 1-20 parts by weight of organopolysiloxane; 1-5 parts by weight parts by weight molybdenum compound. Utilize the solid-phase smoke suppression performance of molybdenum compound and its synergistic carbonization with organopolysiloxane to promote the cross-linking of polysiloxane and polycarbonate to form charcoal during the combustion process, and bond the smoke firmly to the silicon-aromatic system In the composite, it enhances the flame retardancy of the material and suppresses the amount of smoke generated. The smoke-suppressing type halogen-free flame-retardant polycarbonate of the present invention has high flame-retardant efficiency, good smoke-suppressing effect, is halogen-free, non-corrosive and environmentally friendly, and can be widely used in the manufacture of electrical communication components, transportation and building materials.

Description

technical field [0001] The invention relates to a smoke-suppressing type halogen-free flame-retardant polycarbonate, in particular to a polycarbonate which is prepared by synergistic action of organopolysiloxane and molybdenum compound and has both high-efficiency smoke-suppressing and flame-retardant properties. Background technique [0002] Polycarbonate is a thermoplastic engineering plastic widely used in electronics, electrical, construction and other fields with excellent comprehensive performance. It has a certain flame retardancy (oxygen index is about 25), but it still cannot meet the requirements of TV sets and OA equipment. High flame retardancy requirements in applications such as enclosures and components, transformer coils, switches, automotive components, building materials, etc. In view of this, early foreign industries used brominated flame retardants, such as tetrabromobisphenol A, polydibromostyrene, decabromodiphenyl ether, etc., in polycarbonate. These f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L69/00C08K3/22B29C47/40B29B9/12C08L83/04
Inventor 周文君
Owner HANGZHOU NORMAL UNIVERSITY