Halogen-free flame-retardant PBT/PC alloy composition and method of preparing the same

A composition and alloy technology, applied in the field of flame retardants, can solve problems such as difficult interface bonding and small interaction force, and achieve the effects of reducing matrix performance degradation, easy dispersion, and large heat absorption

Inactive Publication Date: 2008-12-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The alloy matrix is ​​mainly PC, and its flame retardancy is relatively easy to achieve, and compared with PC, PBT has an obvious price advantage. Therefore, compared with PC/PBT alloy, PBT/PC alloy with PBT as the main body realizes halogen-free resistance In addition, the flame retardant synergist phenylmethyl silicone used in this invention has a small interact

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 416g PBT, 176g PC, 240g FM70D, 50g R Si / ester Si-ACR of 0.8, 60g RDP, 50g novolac epoxy resin with epoxy functionality of 3.0, 4g dioctyl phthalate plasticizer, 2g hindered phenolic antioxidant 1010, 2g silicone release agent After being dispersed and mixed by a high-speed mixer, it is melted, kneaded, extruded, cooled, dried, pelletized and packaged by a twin-screw machine. The temperature of each zone of the twin-screw extruder barrel used is 230-260°C. The prepared composition is injection-molded into a standard sample for testing according to a standard size, and the physical properties are tested according to international standards.

[0024] According to the above preparation method, the material example 1 of the present invention and the formulations of the other eight examples are shown in Table 1 to Table 2.

[0025] As can be seen from Table 1 and Table 2, all examples of UL-94 vertical combustion pass the V-0 level (3.2mm). The flame retardant system magne...

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PUM

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Abstract

The invention discloses a halogen-free fire-retardant PTB/PC alloy composition and a preparation method thereof. The formula of the composition comprises the following components in mass percentage: 40 to 50 percent of PBT, 10 to 20 percent of PC, 23 to 33 percent of active magnesium hydrate, 3 to 7 percent of organic phosphate oligomer, 3 to 7 percent of polysiloxane/acrylic ester grafting copolymer, 3 to 7 percent of novolac epoxy, 0.2 to 0.4 percent of antioxidant and 0.4 to 0.8 percent of processing aid. In the formula of the method, all components are dispersed to be mixed and are subject to melting by a double screw extruder, mixing, extrusion, cooling, drying, granulating and packaging. In the invention, the fire-retardant char-forming actions of all added components are combined with the interaction of interfaces of a substrate, which makes the components of the system form an indispensable organic whole, so that the higher fire retardant performance is achieved under the lower consumption of the magnesium hydrate, and the mechanical property, the thermal property and the processability of the system are also good.

Description

technical field [0001] The invention relates to a flame retardant, in particular to a halogen-free flame-retardant PBT / PC alloy composition and a preparation method thereof. Background technique [0002] Polybutylene terephthalate (PBT) is a thermoplastic engineering material with fast crystallization speed, which is easy to realize high-speed molding, has good rigidity and hardness, good creep and solvent resistance, anti-aging performance and can be Processability, low water absorption, but the use of PBT alone has defects such as easy shrinkage and deflection of the part, low heat distortion temperature, and flammability. The polycarbonate (PC) molecular chain contains a large number of benzene rings, which has a large steric hindrance, good rigidity and toughness, high char formation rate, and self-extinguishing. Blending a small amount of PC to modify PBT (that is, to form a PBT / PC alloy) can improve the self-extinguishing property and carbon-forming ability of PBT to ...

Claims

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Application Information

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IPC IPC(8): C08L67/00C08L51/08C08L63/04C08K13/06C08K9/04C08K5/521B29B7/48B29B9/06C08L69/00
CPCB29C48/40
Inventor 刘述梅黄君仪赵建青陈俊
Owner SOUTH CHINA UNIV OF TECH
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