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Method for preparing suspended polymeric flame-retardant modified polystyrene

A technology of polystyrene and styrene monomer, which is applied in the field of preparation of flame-retardant modified polystyrene by suspension polymerization, and can solve the problems of affecting the performance of the material, instability, and large amount of addition

Inactive Publication Date: 2013-05-08
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the flame retardant method commonly used in polystyrene is to add various flame retardants during the melt blending process, but a large amount of flame retardants added in order to meet the flame retardant requirements will affect other properties of the material, such as the appearance of the material , mechanical properties of materials, etc.
The problems of easy migration, instability, and large addition of flame retardants have been difficult to overcome

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add 200ml polyvinyl alcohol aqueous solution (1.5%) into a 500ml three-neck flask, fill with nitrogen for 3 minutes, and raise the temperature to 60°C. Styrene monomer dissolved in 1% flame retardant (TCEP) and 2% initiator was added. Start the mechanical stirring, and the stirring speed is 450 / min. After stirring for 10 minutes, the temperature was raised to 80° C. and maintained at this temperature for 30 minutes, then the temperature was raised to 90° C. for 2 hours, and the reaction temperature was kept fluctuating within ±5° C. Sampling and observation every 20 minutes. After the beads hardened, the temperature was raised to 95°C and aged for 30 minutes. The polymer was repeatedly washed 3 times with deionized water at about 70°C, and filtered with suction. Then the washed polymer was dried in an oven at 80°C for 24 hours. The obtained polystyrene beads were extruded by a twin-screw extruder (extrusion temperature 190°C) and hot-pressed for various tests.

Embodiment 2

[0018] Add 200ml polyvinyl alcohol aqueous solution (1.5%) into a 500ml three-neck flask, fill with nitrogen for 3 minutes, and raise the temperature to 60°C. Styrene monomer dissolved in 2% flame retardant (TCEP) and 2% initiator was added. Start the mechanical stirring, and the stirring speed is 450 / min. After stirring for 10 minutes, the temperature was raised to 85° C. and maintained at this temperature for 30 minutes, then the temperature was raised to 90° C. for 3 hours, and the reaction temperature was kept fluctuating within ±5° C. Sampling and observation every 20 minutes. After the beads hardened, the temperature was raised to 95°C and aged for 30 minutes. The polymer was repeatedly washed 3 times with deionized water at about 70°C, and filtered with suction. Then the washed polymer was dried in an oven at 80°C for 24 hours. The obtained polystyrene beads were extruded by a twin-screw extruder (extrusion temperature 190°C) and hot-pressed for various tests.

Embodiment 3

[0020] Add 200ml polyvinyl alcohol aqueous solution (1.5%) into a 500ml three-neck flask, fill with nitrogen for 3 minutes, and raise the temperature to 60°C. Styrene monomer dissolved in 3% flame retardant (TCEP) and 2% initiator was added. Start the mechanical stirring, and the stirring speed is 350 / min. After stirring for 10 minutes, the temperature was raised to 85° C. and maintained at this temperature for 30 minutes, then the temperature was raised to 90° C. for 3 hours, and the reaction temperature was kept fluctuating within ±5° C. Sampling and observation every 20 minutes. After the beads hardened, the temperature was raised to 95°C and aged for 30 minutes. The polymer was repeatedly washed 3 times with deionized water at about 70°C, and filtered with suction. Then the washed polymer was dried in an oven at 80°C for 24 hours. The obtained polystyrene beads were extruded by a twin-screw extruder (extrusion temperature 190°C) and hot-pressed for various tests.

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Abstract

The invention discloses a method for preparing suspended polymeric flame-retardant modified polystyrene through adding a second monomer. The second monomer used in the method is an oil soluble phosphorus-based flame retardantn, namely tris (2-carboxyethyl) phosphine (TCEP) or tri-butyl-phosphate (TBP), and an initiator is benzoyl peroxide (BPO), and also can be other initiating systems. The proportion of each component of a reaction system and the implementation process are not markedly different from those in conventional suspension polymerization. The oil soluble flame retardant can be uniformly distributed in a polymerization system, and always stably exist with the implementation of reaction. The second monomer does not participate in the polymerization reaction of polystyrene molecular chains, and is uniformly dispersed in polystyrene beads only in oily droplet form.

Description

technical field [0001] The invention relates to a preparation method of suspension polymerization flame-retardant modified polystyrene technical background [0002] Polystyrene refers to a polymer synthesized from styrene monomer through free radical polycondensation reaction. Its synthesis methods include suspension polymerization, bulk polymerization, emulsion polymerization, solution polymerization, etc., but the suspension polymerization process is mostly used at home and abroad. Polystyrene occupies an important position in synthetic resins and has become one of the five general-purpose plastics today. Although it has such excellent physical and chemical properties, polystyrene is an organic hydrocarbon with an oxygen index of only 18.0. It is a flammable material and can be ignited by fire. Even if the fire source is removed, it can still burn continuously. Accompanied by dense smoke and visible molten drops with open flames. This disadvantage limits the application...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F112/08C08F2/20C08F2/44C08L25/06
Inventor 张胜李玉玲谷晓昱
Owner BEIJING UNIV OF CHEM TECH
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