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Preparation method of in-situ halogen-free flame-retardant expandable polystyrene

A technology of expandable polystyrene and styrene monomer, which is applied in the field of in-situ addition of halogen-free flame retardants to prepare expandable polystyrene, achieving the effects of difficult precipitation, high flame retardant efficiency, and high utilization rate

Inactive Publication Date: 2015-07-29
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Most of the flame retardants used in these published patents are halogen flame retardants, and only halogen-free flame retardants are used in suspension polymerization to meet the flame retardant requirements, and there is no report

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] In 1.20kg styrene monomer, add 120g triphenyl phosphate (TPP, 10wt%, based on styrene), and add benzoyl peroxide 3.80g, dicumyl peroxide 3.85g and benzoic acid peroxide 0.95 g of tert-butyl ester was ultrasonically dissolved for 5 minutes to make it completely dissolved to prepare a flame retardant-containing styrene premixed liquid for use.

[0047] Weigh 2.40kg of deionized water, add it to a 5L reaction kettle, turn on the agitator, and rotate at a speed of 300r / min; then add 7.69g of active calcium phosphate and 0.04g of sodium dodecylbenzenesulfonate in sequence; Styrene premix; then heat up to 90°C within 1.0 to 1.5 hours, carry out constant temperature control at 90±0.5°C, granulate at constant temperature for about 5 hours, and add 96g of pentane under pressure. The temperature was raised to 120° C., and the temperature was controlled for 3 hours, the temperature was lowered, the material was discharged, washed and dried. Foam according to the conventional method...

Embodiment 2

[0049] In 1.20kg styrene monomer, add 120g triphenyl phosphate (TPP, 10wt%, based on styrene) and 120g bisphenol A-bis(diphenyl phosphate) (BDP, 10wt%, based on styrene ), and added 3.80g of benzoyl peroxide, 3.85g of dicumyl peroxide and 0.95g of tert-butyl peroxybenzoate, and ultrasonicated for 5 minutes to completely dissolve it to make styrene pre- Mixture, set aside.

[0050] Weigh 2.40kg of deionized water, add it to a 5L reaction kettle, turn on the agitator, and rotate at a speed of 300r / min; then add 7.69g of active calcium phosphate and 0.04g of sodium dodecylbenzenesulfonate in sequence; Styrene premix; then heat up to 90°C within 1.0 to 1.5 hours, carry out constant temperature control at 90±0.5°C, granulate at constant temperature for about 5 hours, and add 96g of pentane under pressure. The temperature was raised to 120° C., and the temperature was controlled for 3 hours, the temperature was lowered, the material was discharged, washed and dried. Foam according...

Embodiment 3

[0052] In 1.20kg styrene monomer, add 144g triphenyl phosphate (TPP, 12wt%, based on styrene) and 144g bisphenol A-bis(diphenyl phosphate) (BDP, 12wt%, based on styrene ), and added 3.80g of benzoyl peroxide, 3.85g of dicumyl peroxide and 0.95g of tert-butyl peroxybenzoate, and ultrasonicated for 5 minutes to completely dissolve it to make styrene pre- Mixture, set aside.

[0053] Weigh 2.40kg of deionized water, add it to a 5L reaction kettle, turn on the agitator, and rotate at a speed of 300r / min; then add 7.69g of active calcium phosphate and 0.04g of sodium dodecylbenzenesulfonate in sequence; Styrene premix; then heat up to 90°C within 1.0 to 1.5 hours, carry out constant temperature control at 90±0.5°C, granulate at constant temperature for about 5 hours, and add 96g of pentane under pressure. The temperature was raised to 120° C., and the temperature was controlled for 3 hours, the temperature was lowered, the material was discharged, washed and dried. Foam according...

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Abstract

The invention provides a preparation method of in-situ halogen-free flame-retardant expandable polystyrene. The preparation method is characterized by adding halogen-free flame retardants in situ in a suspension polymerization process to obtain expandable polystyrene and prepare a halogen-free flame-retardant foamed polystyrene material with a flame-retardant grade which reaches the grade B. The halogen-free flame retardants are insoluble in water and can be dissolved or be fully dispersed in styrene monomers. The method comprises the following steps: firstly adding the halogen-free flame retardants into the styrene monomers, fully dispersing and dissolving the flame retardants to prepare a halogen-free flame retardant dispersion solution, then adding the halogen-free flame retardant dispersion solution into water phase to carry out polymerization reaction and obtain final reaction products which are flame-retardant-containing expandable polystyrene resin particles; the flame retardants are uniformly distributed in the polystyrene particles, so that the high flame-retardant efficiency can be implemented.

Description

technical field [0001] The invention relates to a method for preparing expandable polystyrene by adding a halogen-free flame retardant in situ. Background technique [0002] In the field of building materials, the use of energy-saving, environmentally friendly and safe building insulation materials has attracted more and more attention. As a good thermal insulation material, expandable polystyrene (EPS) is mainly used for roofs and walls of buildings to play the role of thermal insulation, sound insulation, and water vapor isolation. The external insulation area of ​​new buildings is built every year in my country. Nearly 2 billion square meters, of which more than 70% have used polystyrene foam for external wall insulation. However, expandable polystyrene is easy to burn, and produces a large amount of harmful gas and molten drops when burning, accompanied by a large amount of black smoke, which poses a huge potential threat to people's lives and property safety, which affe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/20C08F112/08C08F2/44C08F2/18C08K5/523
Inventor 李向梅张存位杨荣杰
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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