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Flame-retardant composition and application thereof, PBT composite material and preparation method of PBT composite material

A technology of flame retardant composition and composite material, which is applied in the field of flame retardant materials, and can solve the problems of low flame retardant anti-dripping, low flame retardant efficiency, easy decomposition, etc.

Active Publication Date: 2021-05-18
ZHEJIANG XINHUA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these halogen-free flame retardants still have some shortcomings, such as resorcinol bis(diphenyl phosphate) flame retardants are liquid, inconvenient to use, low thermal decomposition temperature, low flame retardant efficiency, flame retardant and anti-dripping Low dropability; hypophosphite flame retardants are easy to decompose during use, there is a risk of explosion, and it will lead to a serious decline in the mechanical properties of PBT materials

Method used

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  • Flame-retardant composition and application thereof, PBT composite material and preparation method of PBT composite material

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preparation example Construction

[0046] One embodiment of the present invention also provides a method for preparing a PBT composite material, including the following steps S10-S20.

[0047] Step S10, according to the raw material ratio of the above-mentioned PBT composite material, mix the flame retardant composition, polybutylene terephthalate and coupling agent to obtain a mixture.

[0048] In some embodiments, in step S10, the conditions for mixing the flame retardant composition, the polybutylene terephthalate and the coupling agent are: mixing at 80° C. to 120° C. for 10 minutes to 15 minutes.

[0049] It can be understood that the above mixing step can be carried out in any device capable of mixing substances in the art, specifically, the above mixing step is carried out in a high mixer, and the speed of the high mixer is 600rmp-900rmp.

[0050] In some of these embodiments, before the step of mixing the flame retardant composition, the polybutylene terephthalate and the coupling agent, a step of dryin...

Embodiment 1

[0059] 1) Couple 57.5kg of PBT, 11kg of aluminum diethylphosphinate, 3kg of melamine polyphosphate, 2kg of melamine cyanurate, 0.8kg of organic montmorillonite (DK2 type), 0.2kg of aluminum phosphite, and 0.5kg of silane The agent is placed in a high-speed mixer, and mixed for 12 minutes at a temperature of 90°C and a stirring speed of 700rmp. The materials are uniformly mixed under the action of the stirring paddle to obtain a mixture, which is discharged for use.

[0060] 2) Add the homogeneously mixed mixture in step 1) into the hopper of the twin-screw extruder that has been preheated to the set temperature, and the material is heated and melted while being mixed and conveyed forward by the screw rotation, and 25kg of long glass fibers are quantitatively Add it from the exhaust port in the middle of the extruder, mix it with the melt, extrude it through the die of the extruder, and form strips, cool it in a water tank, and then cut it into pellets with a pelletizer to obtai...

Embodiment 2

[0064] 1) Put 55.5kg of PBT, 12kg of aluminum diethylphosphinate, 4kg of melamine polyphosphate, 2kg of melamine cyanurate, 1kg of organic montmorillonite (DK2 type), and 0.5kg of silane coupling agent in a high-speed mixer , mixed at a temperature of 90° C. and a stirring speed of 700 rpm for 12 minutes, and the materials were uniformly mixed under the action of a stirring paddle to obtain a mixture, which was discharged for use.

[0065] 2) Add the homogeneously mixed mixture in step 1) into the hopper of the twin-screw extruder that has been preheated to the set temperature, and the material is heated and melted while being mixed and conveyed forward by the screw rotation, and 25kg of long glass fibers are quantitatively Add it from the exhaust port in the middle of the extruder, mix it with the melt, extrude it through the die of the extruder, and form strips, cool it in a water tank, and then cut it into pellets with a pelletizer to obtain a modified composite material.

...

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Abstract

The invention relates to a flame-retardant composition and application thereof, a PBT (polybutylene terephthalate) composite material and a preparation method of the PBT composite material. The flame-retardant composition is prepared from the following components in percentage by weight: 55 to 65 percent of aluminum diethylphosphinate, 15 to 26 percent of melamine polyphosphate, 10 to 15 percent of melamine cyanurate, 4 to 8 percent of organic modified montmorillonite and 0 to 5 percent of aluminum phosphite. When the flame-retardant composition and main materials such as PBT are melted and mixed to prepare the flame-retardant material, the prepared flame-retardant material can be decomposed to form a coke layer in the combustion process, the coke layer has the function of a heat-insulating oxygen-blocking protective layer, and meanwhile, the nitrogen-containing compound in the flame-retardant composition also has the functions of foaming and coke enhancement, and aluminum phosphite can achieve synergistic flame-retardant and whitening effects, so that the prepared flame-retardant material is good in flame retardance and can maintain good mechanical properties.

Description

technical field [0001] The invention relates to the technical field of flame retardant materials, in particular to a flame retardant composition and its application, a PBT composite material and its preparation method. Background technique [0002] Polybutylene terephthalate (PBT for short) is a thermoplastic engineering plastic with wide sources and low price, but its mechanical properties and flame retardancy are low, which limits its application in the engineering field. One technique attempts to modify polybutylene terephthalate with a flame retardant to improve its flame retardancy. It is said that the flame retardants used are generally halogen-free flame retardants, such as resorcinol bis(diphenyl phosphate) or hypophosphite, which are low-smoke and halogen-free, and can improve Flame retardant properties of polybutylene terephthalate. However, these halogen-free flame retardants still have some shortcomings, such as resorcinol bis(diphenyl phosphate) flame retardan...

Claims

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Application Information

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IPC IPC(8): C08K9/04C08K3/34C08K3/32C08K5/5313C08K5/52C08K5/3492C08L67/02C08K13/06C08K7/14C08J5/04
CPCC08K9/04C08K3/346C08K3/32C08K5/5313C08K5/5205C08K5/34928C08J5/043C08K2201/011C08J2367/02C08K13/06C08K7/14
Inventor 应思斌周健章震王超远吴杨杨祝航洪晔谢自强陈攀
Owner ZHEJIANG XINHUA CHEM
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