A preparation method of flame-retardant expandable polystyrene pellets containing exfoliated graphite

A technology of expandable polystyrene and exfoliated graphite, which is applied in the field of preparation of flame-retardant expandable polystyrene pellets, can solve the problem of easy agglomeration, uneven dispersion of graphite particles, and flame-retardant expandable polystyrene. Problems such as poor thermal insulation performance, to achieve the effect of improving dispersibility and reducing the tendency of agglomeration

Active Publication Date: 2016-08-17
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem that expandable polystyrene suspension polymerization containing graphite particles prepared by the existing method is easy to agglomerate, the dispersion of graphite particles in polystyrene is not uniform, and the flame retardant and heat insulation performance of expandable polystyrene is poor. Technical problem, thus providing a preparation method of flame-retardant expandable polystyrene pellets containing exfoliated graphite

Method used

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specific Embodiment approach 1

[0013] Specific embodiment one: the preparation method of a kind of flame-retardant expandable polystyrene pellet containing exfoliated graphite of the present embodiment is to carry out according to the following steps:

[0014] 1. 100 parts by weight of styrene, 100-300 parts of water, 1-20 parts of expandable graphite, 0.1-1 part of dibenzoyl peroxide, 0.2-2 parts of dispersant, 0.01-1 part of emulsifier , 7 to 10 parts of pentane;

[0015] 2. Add the expandable graphite and 0.1-2 parts of flame retardant weighed in step 1 to the styrene weighed in step 1, and ultrasonically disperse for 30-60 minutes to obtain a mixture. Diphenyl peroxide weighed in step 1 Formyl is added to the mixture, heated to 80-90°C at a stirring speed of 200-400 rpm and reacted for 1-5 hours to obtain the first mixture;

[0016] 3. Add the dispersant weighed in step 1 into the water weighed in step 1, and vibrate ultrasonically for 30-60 minutes to obtain the second mixture;

[0017] 4. Add the se...

specific Embodiment approach 2

[0021] Embodiment 2: This embodiment differs from Embodiment 1 in that: the particle size of the expandable graphite in step 1 is 50-150 μm. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0022] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the particle size of the expandable graphite in step 1 is 50-100 μm. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a method for preparing flame-retardant expandable polystyrene spheres containing delamination graphite, relates to a method for preparing flame-retardant expandable polystyrene spheres, and aims at solving the technical problems that the expandable polystyrene containing delamination graphite containing graphite granules prepared by the existing method is polymerized and easily aggregated in a suspension manner, the graphite granules are uneven to disperse in polystyrene, and poor in flame-retardant insulation performance of the expandable polystyrene. The preparation method disclosed by the invention comprises the following steps: 1, weighing raw materials according to parts by weight; 2, preparing a first mixture; 3, preparing a second mixture; 4, adding the second mixture to the first mixture under agitation, adding an emulsifier after reaction, continuing to react, and then adding pentane, charging nitrogen into a reaction kettle, heating up and reacting, naturally cooling after reaction is ended, slowly releasing a gas and discharging until the pressure is zero; washing and drying, so as to obtain the flame-retardant expandable polystyrene spheres containing delamination graphite. The method is applied to the field of preparation of the flame-retardant expandable polystyrene spheres.

Description

technical field [0001] The invention relates to a preparation method of flame-retardant expandable polystyrene pellets. Background technique [0002] Expandable polystyrene (EPS) has been widely used in many fields due to its excellent and durable thermal insulation, unique cushioning and shock resistance, aging resistance and water resistance. EPS is a building material with excellent performance for external wall insulation. With the continuous increase of its output and consumption, the defect that EPS is easy to burn has attracted widespread attention, and it is urgent to improve its flame retardant performance. At the same time, in order to meet the increasingly stringent requirements for energy conservation and environmental protection, it is necessary to further reduce the thermal conductivity of EPS. [0003] Expandable graphite is a good flame retardant for polymer materials, and has the characteristics of non-toxic and non-polluting. At high temperature, the rapi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/20C08L25/06C08K3/04C08F112/08
Inventor 胡桢王亚飞黄玉东李震辉黎俊赵生俊易国星李楠
Owner HARBIN INST OF TECH
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