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Preparation method of environment-friendly foamed polystyrene

An environmentally friendly technology for expanded polystyrene, applied in the field of preparation of environmentally friendly expanded polystyrene, can solve the problems of insufficient water dispersion of foaming agent, serious phase separation, etc.

Active Publication Date: 2013-10-30
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the above methods for preparing water-expandable polystyrene can produce water-expanded polystyrene, there are still some areas to be improved. The main problem is that the phase separation phenomenon in the polymerization process is relatively serious, and it is easy to cause foaming agent water in the polymer matrix. The dispersion is not uniform enough

Method used

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  • Preparation method of environment-friendly foamed polystyrene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Pre-polymerization: first dissolve 0.35g of benzoyl peroxide in 350g of styrene monomer as the initiator of the pre-polymerization stage, and pour the solution into a 2L reactor; then dissolve 17.5g of acrylic acid or Acrylamide monomer, this part of the solution is also poured into the reaction kettle. Set the temperature at 95° C., the stirring rate at 750 rpm, and the prepolymerization time for 1 hour.

[0025] (2) Suspension polymerization: After the prepolymerization is completed, the stirring rate is adjusted to 350 rpm, and 3.5 g of benzoyl peroxide, an initiator in the suspension polymerization stage, is added. Then add the mixed aqueous solution 1050g that is dissolved with suspension stabilizer hydroxyethyl cellulose and tricalcium phosphate to carry out suspension polymerization as continuous phase, wherein the concentration of hydroxyethyl cellulose and tricalcium phosphate is respectively 0.12% and 0.3%, relative to the The mass fraction of ionized wat...

Embodiment 2

[0027] Prepolymerization: first dissolve 0.35g benzoyl peroxide in 350g styrene monomer as the initiator in the prepolymerization stage, pour the solution into a 2L reactor; then dissolve 35g acrylic acid or acrylamide monomer with 35g deionized water , Pour this part of the solution into the reaction kettle. Set the temperature at 95° C., the stirring rate at 750 rpm, and the prepolymerization time for 1 hour.

[0028] (2) Suspension polymerization: After the prepolymerization is completed, the stirring rate is adjusted to 350 rpm, and 3.5 g of benzoyl peroxide, an initiator in the suspension polymerization stage, is added. Then add the mixed aqueous solution 1050g that is dissolved with suspension stabilizer hydroxyethyl cellulose and tricalcium phosphate to carry out suspension polymerization as continuous phase, wherein the concentration of hydroxyethyl cellulose and tricalcium phosphate is respectively 0.12% and 0.3%, relative to the The mass fraction of ionized water. ...

Embodiment 3

[0030] (1) Pre-polymerization: first dissolve 0.035g benzoyl peroxide in 350g styrene monomer as the initiator in the pre-polymerization stage, and pour the solution into a 2L reactor; then dissolve 17.5g acrylic acid or acrylic acid with 35g deionized water Acrylamide monomer, this part of the solution is also poured into the reaction kettle. Set the temperature at 95° C., the stirring rate at 750 rpm, and the prepolymerization time for 1 hour.

[0031] (2) Suspension polymerization: After the prepolymerization is completed, the stirring rate is adjusted to 350 rpm, and 3.5 g of benzoyl peroxide, an initiator in the suspension polymerization stage, is added. Then add the mixed aqueous solution 1050g that is dissolved with suspension stabilizer hydroxyethyl cellulose and tricalcium phosphate to carry out suspension polymerization as continuous phase, wherein the concentration of hydroxyethyl cellulose and tricalcium phosphate is respectively 0.12% and 0.3%, relative to the Th...

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Abstract

The invention relates to a preparation method of environment-friendly foamed polystyrene. The preparation method comprises the following steps of: firstly dissolving 0.03%-0.3% of benzoyl peroxide in a styrene monomer, dissolving 3.5-35 grams of acrylic acid or an acrylamide monomer by using 35 grams of deionized water, and setting temperature at 90-95 DEG C, stirring velocity at 700-800 rpm and prepolymerization time for 0.5-2 hours; supplementing the initiating agent, namely, benzoyl peroxide which accounts for 0.3%-3% of the weight of the styrene monomer in a suspension polymerization stage, then adding 1050 grams of a mixed water solution which contains a dissolved suspension stabilizer, namely, hydroxy ethyl cellulose and tricalcium phosphate, wherein the concentrations of the hydroxy ethyl cellulose and the tricalcium phosphate respectively account for 0.12% and 0.3% of the mass of the deionized water, the temperature is 95-100 DEG C, the rotation speed is 450 rpm, and the polymerization time is 4-6 hours; after the polymerization is finished, filtering and washing a product to obtain the water foamed polystyrene. The foamed polystyrene prepared by adopting the preparation method disclosed by the invention has no pollution to the environment by being prepared by using water as a foaming agent.

Description

technical field [0001] The invention relates to a method for preparing environmentally friendly expanded polystyrene. More specifically, expanded polystyrene is produced by using water as a blowing agent instead of pentane, an organic blowing agent. Background technique [0002] Traditional expandable polystyrene uses pentane as a blowing agent, and pentane will be slowly released into the atmosphere during processing and use, causing environmental pollution. Studies have shown that organic hydrocarbons contribute to the production of low-altitude ozone, which can irritate the lungs, produce plant toxins, and damage crops. At present, the consumption of expandable polystyrene in the world is 5 million tons per year, and 250,000 tons of organic volatiles are released into the atmosphere every year. [0003] In 2004, Nova Chemicals and plastic processing equipment company Teubert Mmqchineubau jointly developed a new process for producing expanded polystyrene from water. Jap...

Claims

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Application Information

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IPC IPC(8): C08F212/08C08F220/06C08F220/56C08F2/20C08J9/20
Inventor 李齐方李连伟陈广新
Owner PETROCHINA CO LTD