Preparation method of sericite-doped expandable polystyrene composite beads

A technology of expandable polystyrene and polystyrene, which is applied in the field of new energy-saving materials, and can solve the problems of high probability of sticking to the kettle, unsatisfactory methods, and easy adhesion of doped sericite polystyrene composite beads , to avoid adhesion phenomenon, good social and economic benefits, and increase the viscosity of the composite system

Active Publication Date: 2022-02-11
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although many properties of the material have been improved by doping sericite polystyrene, the method for synthesizing doped sericite polystyrene composite beads is not satisfactory, and the existing methods prepare doped sericite polystyrene composite beads The probability of sticking to the kettle is high, and the phenomenon of sticking is very easy to occur during suspension polymerization, which urgently needs to be improved

Method used

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  • Preparation method of sericite-doped expandable polystyrene composite beads
  • Preparation method of sericite-doped expandable polystyrene composite beads
  • Preparation method of sericite-doped expandable polystyrene composite beads

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preparation example Construction

[0037] The preparation method of the present invention doping sericite expandable polystyrene composite beads comprises the following steps:

[0038] Add a certain weight ratio of sericite, styrene monomer, initiator and other additives into the reaction kettle, stir to dissolve the initiator and other additives and evenly disperse the sericite in the styrene monomer, continue stirring, and pass The increase in the viscosity of styrene monomer is achieved as follows.

[0039] Specifically, the other additives include nucleating agents and flame retardants.

[0040] The initiator is benzoyl peroxide, or benzoyl peroxide and tert-butyl peroxybenzoate at a mass ratio of 1-5:1.

[0041] The mass ratio of the styrene monomer to the initiator is 100:0.1-2.

[0042] The sericite is a modified lipophilic sericite, and the surface of the sericite is made lipophilic by adding a surface modifying agent such as silane and titanate.

[0043] The mass ratio of styrene to polystyrene and ...

Embodiment 1

[0055] Add 10g Na to 500ml desalted water 2 SO 4 , 0.15 sodium dodecylsulfonate and 0.25 sodium carboxymethylcellulose were dissolved at 40°C to obtain a dispersant.

[0056] Weigh 10 g of sericite, 180 g of styrene (200 mL), 1.5 g of benzoyl peroxide, 3 g of hexabromocyclododecane, 0.37 g of tert-butyl peroxybenzoate, 0.35 g of DCP, and 0.38 g of nucleating agent in 1 In the elevated autoclave, stir at 500rpm under normal temperature and pressure, heat gradually to 83°C and start in-situ polymerization and measure the viscosity of the styrene phase. The viscosity of the styrene phase was measured at 100min as 48cP.

[0057] Keep the rotation speed at 500rpm, add 380mL of the above dispersant and stabilize it for 30min, then raise the temperature to 85°C and keep the temperature constant for 140min, check whether the particles sink and harden in normal temperature water, if sink and harden, add 1g calcium hydroxyphosphate powder and seal the kettle . Keep the rotating speed...

Embodiment 2

[0059] Weigh 9.9kg of modified sericite, 135kg of styrene, 1kg of benzoyl peroxide, 3kg of hexabromocyclododecane, 370g of tert-butyl peroxybenzoate, 350g of DCP, and 380g of nucleating agent in a 900L autoclave, Stir at 140 rpm under normal pressure, add 45 kg of polystyrene waste and stir until completely dissolved, at this time the viscosity of the styrene phase is 218 cP.

[0060] Keep the rotation speed at 140rpm, add 390L of dispersant (containing 0.8% sodium oleate, 0.01% hydroxymethyl cellulose, 1% Na 2 SO 4 , and 0.015% gelatin), and after stabilizing for 30 minutes, raise the temperature to 85°C and keep the temperature constant for 140 minutes, check whether the particles sink and harden in normal temperature water, if sink and harden, add 1kg calcium hydroxyphosphate powder and seal the kettle. Keep the rotational speed at 140 rpm, and heat up to 115° C. at a heating rate of 0.2° C. / min. Utilize the pressure balance feeding device to add pentane 16kg, add N 2 Pr...

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Abstract

The invention relates to a preparation method of a sericite-doped expandable polystyrene composite bead. According to the method, by a method of increasing viscosity in advance, in-situ polymerization is conducted on a styrene monomer or a certain amount of polystyrene, ABS (Acrylonitrile Butadiene Styrene) resin or polymethyl methacrylate are added into the styrene monomer, after the viscosity of the styrene phase is increased, a dispersing agent solution is added for suspension polymerization, and the sericite-doped polystyrene beads are obtained. The process for preparing the sericite-doped expandable polystyrene composite beads by using an early viscosity increasing method is stable, the phenomenon of sticking to a kettle is avoided, polystyrene waste can be utilized in the preparation process, and the preparation of diversified and multifunctional polystyrene beads can be realized.

Description

technical field [0001] The invention belongs to the technical field of new energy-saving materials, and in particular relates to a method for preparing expandable polystyrene composite beads doped with sericite. Background technique [0002] Studies have found that sericite-doped (expandable) polystyrene can improve the mechanical and thermal properties of polystyrene bead products. "Research on Preparation and Properties of Waste Polystyrene-Based Composite Materials" discloses that sericite / polystyrene composite materials prepared by suspension distillation method have improved mechanical and thermal properties. [0003] Chinese patent CN110218397A discloses a preparation method of ultra-low thermal conductivity sericite / expandable polystyrene beads. Before suspension polymerization, modified sericite is doped in styrene monomer, and the obtained polystyrene beads pass through A foaming agent is added in a one-step method or a two-step method to prepare sericite / expandabl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/16C08L25/06C08L33/12C08L55/02C08K3/34C08F112/08C08F2/18
CPCC08J9/16C08F112/08C08J2325/06C08J2425/06C08J2433/12C08J2455/02C08K3/34C08F2/18
Inventor 李俊锋赵志峰王鑫磊
Owner JILIN UNIV
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