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Process for preparing expandable polystyrene/silica airgel core-shell composite particle

A technology of expandable polystyrene and composite particles, which is applied in the field of thermal insulation material preparation, can solve the problems of high thermal conductivity of thermal insulation boards, uneven distribution of cells, large cells, etc., and achieve the effect of accelerating the crystallization speed.

Inactive Publication Date: 2012-09-12
陕西得波材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the expandable polystyrene particles on the market only use styrene monomer as raw material and adopt the method of suspension polymerization. The foamed polystyrene particles produced have relatively large cells and uneven distribution of cells, resulting in The thermal conductivity of the insulation board is relatively large

Method used

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  • Process for preparing expandable polystyrene/silica airgel core-shell composite particle
  • Process for preparing expandable polystyrene/silica airgel core-shell composite particle
  • Process for preparing expandable polystyrene/silica airgel core-shell composite particle

Examples

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Embodiment 1

[0023] An expandable polystyrene / SiO 2 The preparation process of airgel core-shell composite particles comprises the following steps:

[0024] 1) Preparation of water phase solution, 400 parts of water, 3 parts of tricalcium phosphate, and 7 parts of polyvinyl alcohol solution are prepared into water phase solution, dispersed in a high-pressure reactor for 20 minutes and heated up, and the temperature is set at 60°C;

[0025] 2) Oil phase solution preparation, in 100 parts of styrene monomer, add benzoyl peroxide, tributyl phosphate and other auxiliary agents to mechanically disperse for 15 minutes, and pass the mixed solution into the outer tube of the core-shell droplet generator; Hydrophobically modified SiO 2 Two parts of the airgel are drawn out from the inner tube of the core-shell droplet generator;

[0026] 3) When the temperature in the reactor reaches 60°C, introduce the oil phase solution into the water phase solution through the core-shell droplet generator, set...

Embodiment 2

[0030] An expandable polystyrene / SiO 2 The preparation process of airgel core-shell composite particles comprises the following steps:

[0031] 1) Preparation of water phase solution, 400 parts of water, 6 parts of tricalcium phosphate, and 5 parts of polyvinyl alcohol solution are prepared into water phase solution, dispersed in a high-pressure reaction kettle for 20 minutes and heated up, and the temperature is set at 60°C;

[0032] 2) Oil phase solution preparation, in 100 parts of styrene monomer, add benzoyl peroxide, tributyl phosphate and other auxiliary agents to mechanically disperse for 15 minutes, and pass the mixed solution into the outer tube of the core-shell droplet generator; 5 parts of hydrophobically modified SiO2 airgel are drawn out from the inner tube of the core-shell droplet generator;

[0033] 3) When the temperature in the reactor reaches 60°C, introduce the oil phase solution into the water phase solution through the core-shell droplet generator, set...

Embodiment 3

[0037]An expandable polystyrene / SiO 2 The preparation process of airgel core-shell composite particles comprises the following steps:

[0038] 1) Preparation of water phase solution, 400 parts of water, 5 parts of tricalcium phosphate, and 6 parts of polyvinyl alcohol solution are prepared into water phase solution, dispersed in a high-pressure reactor for 20 minutes and heated up, and the temperature is set at 60°C; 2) Oil Phase solution preparation, in 100 parts of styrene monomer, add benzoyl peroxide, tributyl phosphate and other additives to mechanically disperse for 15 minutes, and pass the mixed solution into the outer tube of the core-shell droplet generator; at the same time, the hydrophobic modification Three parts of SiO2 airgel are drawn out from the inner tube of the core-shell droplet generator;

[0039] 3) When the temperature in the reactor reaches 60°C, introduce the oil phase solution into the water phase solution through the core-shell droplet generator, se...

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Abstract

The invention relates to a process for preparing an expandable polystyrene / silica airgel core-shell composite particle, which comprises the following steps of preparing an aqueous phase solution; preparing an oil phase solution; and after the temperature inside a reaction kettle reaches 60 DEG C, introducing the oil phase solution into the aqueous phase solution by a core-shell droplet generator, setting the temperature of the reaction kettle to be 90 DEG C, realizing the control of core-shell ratio of the composite particle by controlling the flow rate of a styrene monomer in the core-shell droplet generator, after the temperature of the reaction kettle reaches 90 DEG C, starting to time, adding pentane after 2.5 hours, after the temperature reaches 100 DEG C, keeping the temperature for 3 hours, cooling to 40 DEG C and discharging. The silica airgel / polystyrene composite heat insulation material designed by the invention simultaneously has the characteristics of low density, good mechanical properties, good flame resistance, low thermal conductivity and the like, and the heat insulation of the prepared polystyrene / silica airgel composite heat insulation board is increased by 65.4% compared with the current EPS (expandable polystyrene) board for heat insulation of buildings.

Description

technical field [0001] The invention relates to the field of heat preservation material preparation, in particular to a preparation process of expandable polystyrene / SiO2 airgel core-shell composite particles. Background technique [0002] Most of the existing building exterior wall insulation boards are EPS boards. Since the thermal conductivity of EPS insulation boards is relatively large, in order to meet the requirements of thermal insulation performance, the thickness of EPS boards can only be thickened. At present, 50mm EPS boards are mostly used. Construction brings great risks, and also brings a lot of troubles for future construction. Expandable Polystyrene / SiO 2 The thermal conductivity of the composite board prepared by airgel core-shell composite particles is 60% lower than that of ordinary EPS boards, which means that the same thermal insulation effect can be achieved, and the thickness of the composite board only needs to be 20mm, which greatly reduces the con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/20C08F112/08C08F2/44C08K9/00C08K3/36
Inventor 耿刚强李凯刘新军杜莹陈安成
Owner 陕西得波材料科技有限公司
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