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Preparation method of efficient flame-retardant polystyrene using brominated flame retardant containing active functional groups

A technology of brominated flame retardants and active functional groups, applied in the field of preparation of high-efficiency flame-retardant polystyrene, can solve problems such as poor dispersion effect, poor flame-retardant effect of polystyrene resin, poor compatibility, etc., and achieve improved flame-retardant Good effect, good environmental protection performance, reduce the effect of thermal polymerization

Active Publication Date: 2022-01-07
USEON NANJING EXTRUSION MACHINERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor compatibility between brominated flame retardants and polystyrene, the dispersion effect of brominated flame retardants in polystyrene matrix is ​​poor, so that the flame retardant effect of the prepared polystyrene resin is relatively poor. Difference

Method used

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  • Preparation method of efficient flame-retardant polystyrene using brominated flame retardant containing active functional groups
  • Preparation method of efficient flame-retardant polystyrene using brominated flame retardant containing active functional groups
  • Preparation method of efficient flame-retardant polystyrene using brominated flame retardant containing active functional groups

Examples

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Comparison scheme
Effect test

preparation example Construction

[0032] This embodiment provides a method for preparing high-efficiency flame-retardant polystyrene using a brominated flame retardant containing active functional groups. The preparation method includes the following steps:

[0033] S1 end-capping: Stir and mix styrene monomer, brominated flame retardant containing active functional groups and ethylenic monomers containing specific active functional groups. After the brominated flame retardant containing active functional groups is completely dissolved, heat up to 90°C~ Continue stirring at 140°C and carry out end-capping reaction to obtain a mixture containing brominated flame retardants with double bonds introduced at the end;

[0034] S2 pre-polymerization: adding an initiator to the mixture obtained in the S1 end-capping step to perform pre-polymerization to obtain a prepolymer;

[0035] S3 post-polymerization: transfer the prepolymer to the post-polymerization equipment to continue the copolymerization, and further devola...

Embodiment

[0049] The difference between Examples 1-4 is that the selected brominated flame retardants containing active functional groups are different from the ethylenic monomers containing specific active functional groups.

[0050] Embodiment 1 is taken as an example below for description.

[0051] A preparation method for high-efficiency flame-retardant polystyrene using a brominated flame retardant containing active functional groups, comprising the following steps:

[0052] S1 capping: under the protection of inert gas, add 9750g styrene monomer, 150g brominated flame retardant containing active functional group, 50g flame retardant synergist and 50g vinyl monomer containing specific active functional group to the prepolymerization reaction In the kettle, stir and mix until the brominated flame retardant containing the active functional group is completely dissolved; then raise the temperature to 125°C and continue stirring, and perform a capping reaction for 1 hour to obtain a mi...

Embodiment 5

[0063] The end-capping step S1 and the prepolymerization step S2 in this embodiment are the same as those in Examples 1-4. For the post-polymerization step of the difference S3, it is specifically: the prepolymer prepared in the S2 prepolymerization step is transported to the extruder, the temperature is set at 180 ° C, the residence time of the prepolymer in the extruder for 50min. After the reaction is completed, the high-efficiency flame-retardant polystyrene resin is obtained by devolatilization through the vacuum system arranged at the end;

[0064] Wherein the used extruder is the extruder group that two screw rod diameters are 48, length-to-diameter ratio 65, connect in series.

[0065] Table 2 Embodiment 5~8 difference material type table

[0066]

[0067]

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Abstract

The invention relates to the field of flame-retardant polystyrene, and particularly discloses a preparation method of efficient flame-retardant polystyrene using a brominated flame retardant containing active functional groups. According to the method, a brominated flame retardant containing active functional groups is dissolved in a reaction system of styrene monomers in advance to form a homogeneous solution with molecules dispersed horizontally; an end-capping reaction is initiated by an alkene monomer containing a specific active functional group, and a double bond is introduced to the tail end of the brominated flame retardant containing the active functional group, so that the brominated flame retardant is bonded to a polystyrene molecular chain in a copolymerization manner; early-stage prepolymerization is performed in a reaction kettle to obtain a prepolymer; and post-polymerization reaction is performed in the reaction kettle or in a reactive extrusion manner to prepare the efficient flame-retardant polystyrene resin special material or flame-retardant master batch. The high-efficiency flame-retardant polystyrene resin prepared by the invention has the advantage of excellent flame-retardant effect, and the prepared product is relatively good in safety and environment-friendly performance.

Description

technical field [0001] The application relates to the field of flame-retardant polystyrene, more specifically, it relates to a method for preparing high-efficiency flame-retardant polystyrene using a brominated flame retardant containing active functional groups. Background technique [0002] Polystyrene is a polymer obtained by polymerization of monomer styrene. Polystyrene is widely used in various fields due to its excellent corrosion resistance, coloring effect and electrical properties. [0003] However, because polystyrene is extremely flammable, and not only will a large amount of smoke be produced during the combustion process, but also molten dripping will occur, which poses a greater safety hazard. Therefore, the flame retardant modification of polystyrene is beneficial to expand the application field of polystyrene materials. [0004] In the related art, flame retardant polystyrene is mainly prepared by melting and mixing various brominated flame retardants and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F222/14C08F222/38C08F220/32C08J3/22C08L25/14C08K3/22
CPCC08F212/08C08J3/226C08J2425/12C08K3/2279C08F222/1025C08F222/38C08F220/325C08F220/32C08L25/18C08F8/18C08F2810/50C08F222/06C08F220/06C08J3/22C08J2325/06C08J2327/24C08L25/08C08L27/24C08L2201/02
Inventor 李书召陈志强
Owner USEON NANJING EXTRUSION MACHINERY CO LTD
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