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Super high flowing, white, fire retardant PBT with no halogen, in high thermal stability, and preparation method

A high thermal stability, white technology, applied in ultra-high flow, high thermal stability white halogen-free flame retardant PBT and production field, can solve phosphorus instability, extrusion production is easy to foam, PBT long-term effect can not meet the use requirements etc. to achieve good mechanical properties and high thermal stability

Active Publication Date: 2009-07-01
NANTONG XINGCHEN SYNTHETIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages are as follows (1) Due to the limitation of the color of the red phosphorus masterbatch itself, the final halogen-free flame-retardant PBT material can only be made into black or dark red
(2) Because red phosphorus is easily oxidized to form phosphoric acid, it is easy to form "water droplets" on the surface of the product, and the electrical properties drop sharply, so the long-term performance of ordinary red phosphorus flame-retardant and halogen-free PBT cannot meet the normal use requirements
(3) In the injection molding of red phosphorus flame retardant and halogen-free PBT, due to the instability of phosphorus, if there is a short stay or abnormal production, it will produce "fire" phenomenon and produce a lot of dense smoke
[0004] In addition, there are reports: PBT products made of ordinary nitrogen, phosphorus compound or ordinary phosphorus-based flame retardants, in fact, either cannot achieve the real flame-retardant effect, or the thermal stability is not enough. Easy to foam or even decompose

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] First bake the polybutylene terephthalate (PBT) of 73.6% by weight at 120-150°C (example 120°C, 135°C, 150°C) for 2-5 hours (example 2, 4, 5 hours), Control the water content below 0.05%; then mix it with 20% by weight of the composite flame retardant through a mixer or separately enter the twin-screw extruder from the metering feeder to plasticize and melt, and add it to the twin-screw extruder at the same time 6% by weight of toughener methacrylate butadiene styrene terpolymer and 0.2% by weight of primary antioxidant (1010) pentaerythritol tetra-3-(3,5-di-tert-butyl-4 hydroxybenzyl ) propionate, 0.2% by weight of auxiliary antioxidant (168) tris ((2,4-di-tert-butylphenyl) phosphite, and then through conventional extrusion, drawing, cooling, pelletizing, homogenizing , Packaging products.

[0036] The preparation method of the composite flame retardant is as follows: first add nano-kaolin to the high mixer and mix, and simultaneously heat up to 70-150°C (example 70°C...

Embodiment 2

[0038]First bake 49.6% by weight of polybutylene terephthalate (PBT) at 120-150°C (example 120°C, 135°C, 150°C) for 2-5 hours (example 2, 4, 5 hours), Control the water content below 0.05%; then mix with 16% by weight of composite flame retardant through a mixer or separately enter the twin-screw extruder from the metering feeder to plasticize and melt, and add it to the twin-screw extruder at the same time The toughener methacrylate butadiene styrene terpolymer of 4% by weight, the alkali-free glass fiber of 30% by weight and the primary antioxidant (1010) pentaerythritol four 3-(3,5- Di-tert-butyl-4-hydroxybenzyl) propionate, 0.2% by weight of auxiliary antioxidant (168) tris ((2,4-di-tert-butylphenyl) phosphite, and then through conventional extrusion, drawing strips, cooled, diced, homogenized, and packaged to obtain products.

[0039] The preparation method of the composite flame retardant is as follows: first add nano-kaolin to the high mixer and mix, and simultaneously...

Embodiment 3

[0044] First bake 85% by weight of polybutylene terephthalate (PBT) at 120-150°C (example 120°C, 135°C, 150°C) for 2-5 hours (example 2, 4, 5 hours), Control the moisture below <0.05%; then mix with 8% by weight of composite flame retardant (3% by weight of organic phosphonate, 2% by weight of nano-kaolin, 3% by weight of silicone) through a mixer or separately Enter the twin-screw extruder from the metering feeder for plasticization and melting, and at the same time add 7% by weight of toughening agent methacrylate butadiene styrene terpolymer to the twin-screw extruder, and then extrude through conventional , stranding, cooling, dicing, mixing, and packaging. All the other are with embodiment 1.

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Abstract

The invention discloses a white halogen-free flame-retardant PBT with ultra-high flow and high thermal stability and its production method. The product is mainly composed of polybutylene terephthalate, composite flame retardant, alkali-free glass fiber, and toughening agent. production. The product of the invention has ultra-high fluidity and high thermal stability.

Description

Technical field: [0001] The invention relates to a halogen-free flame-retardant PBT and a production method. Background technique: [0002] For a long time, most of the flame retardants used in the enhanced PBT flame retardant system are halogen flame retardants. Due to the release of a large amount of smoke and toxic and corrosive hydrogen halide and other gases during combustion, it involves many disadvantages such as polybrominated biphenyls and polybrominated diphenyl ethers. EU 2003 Two directives, WEEE and ROHS, were announced in 2010, pushing the debate on the toxicity and environmental issues of halogen flame retardants to a climax. Sweden even stipulates that plastic parts weighing more than 25 grams in computers cannot contain halides, and Europe also requires no bromide. The development of halogen-free environmentally friendly flame-retardant PBT materials has become an inevitable trend. [0003] At present, most of the halogen-free flame-retardant PBT materials...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/03C08K7/14
Inventor 姚君薛东升
Owner NANTONG XINGCHEN SYNTHETIC MATERIAL
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