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Application of atactic poly-phenyl silsesquioxane in flame retardant polycarbonate

A technology of flame retardant polycarbonate and polyphenyl silicon, applied in the field of flame retardant, can solve the problems of volatile, incompletely understood mechanism, industrialization, etc., and achieve the effect of little impact on mechanical properties

Inactive Publication Date: 2011-01-12
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
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Problems solved by technology

However, the currently used phosphate ester has low hydrolysis stability and is volatile (mostly liquid), which reduces the thermal performance of the flame retardant material. In addition, the phosphate ester flame retardant PC is prone to stress cracking, transparency decreases, thermal stability deteriorates, and high temperature dimensions poor stability
Phosphazenes are flame retardant and contain phosphorus and nitrogen at the same time, and they are high-melting solids with good thermal stability. For example, the molecules contain reactive functional groups and can react with groups on PC, so they have been favored by people in recent years. Attention, in the past three years, there have been many patents on phosphazene as a PC flame retardant, but this type of flame retardant system is still in the development stage, some problems have yet to be resolved, and there may be the possibility of industrialization
(3) Sulfur-containing flame retardant PC, such as aromatic sulfonate (alkali metal or alkaline earth metal) and perfluoroalkyl sulfonate (combined with polytetrafluoroethylene), this technology has already been seen in the 1970s Early U.S. patents (USP 3,775,367) have received more attention in recent years (USP6,605,659, EP 1,278,798, EP 1,385,909, USP 6,346,574, USP 6,342,550, WO04 / 035672, EP 1,348,005). The disadvantage is that thin-walled devices cannot reach UL94V- Level 0, easy to precipitate from the PC matrix; the potassium perfluorobutane sulfonate introduced by 3M has a strong flame retardant effect on PC, but the decomposition temperature is low, and more than a certain amount will seriously affect the transparency of PC, and there is a barrier to use alone. Inconsistent or unreliable flammability levels, it needs to be used in conjunction with other flame retardants (such as halogens); at the same time, the mechanism of sulfonate flame retardant PC has not yet been fully understood

Method used

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  • Application of atactic poly-phenyl silsesquioxane in flame retardant polycarbonate
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Experimental program
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Effect test

Embodiment 1

[0024] A kind of random polyphenylsilsesquioxane, the method for preparing this material is:

[0025] 1) Mix and stir 529g of phenyltrichlorosilane and 2500ml of benzene, then add 5000ml of water dropwise to hydrolyze phenyltrichlorosilane in an aqueous solution of benzene, the hydrolysis temperature is 5°C, and the hydrolysis time is 3h. place, the mixed solution is layered, and the upper oil layer is washed with water to neutrality to obtain a neutral oily substance;

[0026] 2) Add 62.7g of methanol solution of tetramethylammonium hydroxide with a mass concentration of 10% to the oily substance obtained in step 1), heat and stir, the heating temperature is 70°C, and the heating time is 24h; stand still and suction filter , the resulting filter cake was washed with ether, and the washings were dried to obtain 323 g of atactic polyphenylsilsesquioxane as a product, with a yield of 98.8%, and a particle size of 3 to 5 μm. The matrix-assisted laser analysis of the obtained prod...

Embodiment 2

[0035] With embodiment 1, wherein difference is that random polyphenylsilsesquioxane is in step 2) in the application of flame-retardant polycarbonate, adds 32g random polyphenylsilsesquioxane and 733.6g poly Carbonate; the blend of random polyphenylsilsesquioxane flame retardant polycarbonate finally obtained is dried and injection molded to obtain the required performance test sample, according to GB / T 1040.2-2006, with electronic tension The testing machine characterizes its mechanical properties, the tensile strength is 57.5MPa, the elongation at break is 66.0%, the bending strength is 64.6MPa, and the bending modulus is 1118MPa; according to UL94ISBN 0-7629-0082-2, use a horizontal and vertical combustion instrument When the thickness is 3.2mm, it is UL94V-0; when the thickness is 1.6mm, it is UL94V-2; according to GB / T2046.2-2009, the limit oxygen index is 34.7% with an oxygen index meter; according to GB / T 16172-2007, using a cone calorimeter to characterize its maximu...

Embodiment 3

[0037] With embodiment 1, wherein difference is that random polyphenylsilsesquioxane in the application of flame-retardant polycarbonate step 2) in adding 64g random polyphenylsilsesquioxane and 701.6g poly Carbonate; the blend of random polyphenylsilsesquioxane flame retardant polycarbonate finally obtained is dried and injection molded to obtain the required performance test sample, according to GB / T 1040.2-2006, with electronic tension The testing machine characterizes its mechanical properties, the tensile strength is 54.4MPa, the elongation at break is 47.3%, the bending strength is 62.8MPa, and the bending modulus is 1209MPa; according to UL94ISBN 0-7629-0082-2, use a horizontal and vertical combustion instrument When the thickness of its combustion grade is 3.2mm, it is UL94V-0; when the thickness is 1.6mm, it is UL94V-0; according to GB / T2046.2-2009, the limit oxygen index is 35.5% with an oxygen index meter; according to GB / T 16172-2007, using a cone calorimeter to c...

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Abstract

The invention relates to an application of atactic poly-phenyl silsesquioxane in flame retardant polycarbonate, which belongs to the technical field of flame retardance. The application comprises the steps of mixing phenyl trichlorosilane or phenyl ethoxysilane with benzene, stirring, adding water and a catalyst, standing, carrying out suction filtration, washing and obtaining the atactic poly-phenyl silsesquioxane; and then placing the atactic poly-phenyl silsesquioxane, the polycarbonate and processing aids into a blending device for mixing, then carrying out melt blending granulation in a twin-screw extruder, obtaining a blend of the atactic poly-phenyl silsesquioxane and the flame retardant polycarbonate, drying and carrying out injection molding. The application can realize the environment-friendly flame retardant polycarbonate, achieve the flame retardance effect of 1.6mmV-O grade under the condition of few additives and have small impacts on the mechanical properties of a base material.

Description

technical field [0001] The invention relates to the application of random polyphenylsilsesquioxane in flame-retardant polycarbonate, belonging to the field of flame-retardant technology. Background technique [0002] Polycarbonate (PC) is an amorphous, odorless, non-toxic, highly transparent colorless or slightly yellow thermoplastic engineering plastic, with excellent physical and mechanical properties, especially excellent impact resistance, tensile strength, bending strength , High compressive strength; small creep, stable size; good heat resistance and low temperature resistance, stable mechanical properties in a wide temperature range, dimensional stability among the five major engineering plastics, no matter in the world, Or as far as China is concerned, PCs are in the forefront. It is widely used in high-tech industries such as electrical and electronic industries, transportation, construction, aerospace, and precision machinery. Although the flame retardant level of...

Claims

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Application Information

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IPC IPC(8): C08L69/00C08L83/04C08L51/06C08G77/06
Inventor 李向梅李腊梅杨荣杰
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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