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Inorganic powder modified expandable polystyrene particles

A technology of expandable polystyrene and inorganic powder, which is applied in the field of inorganic powder modification and treatment of expandable polystyrene beads, which can solve the problem of large performance degradation of expanded polystyrene materials, unfavorable product performance, guarantee, etc. question

Inactive Publication Date: 2011-03-16
罗付生
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

We have found in actual use that the addition of more than 10wt% of inorganic powder materials such as hydrotalcite during the polymerization process will also lead to unstable polymerization process, and the performance of expanded polystyrene materials will decrease too much, which is not conducive to the final product. Guarantee of performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: Preparation of hydrotalcite flame-retardant expandable polystyrene beads by suspension polymerization

[0016] Select 20 kilograms of styrene monomers for use, be dispersed in 20 liters of deionized water (contain 100 grams of sodium pyrophosphate in the water phase), add the hydrotalcite powder (average particle size is 5 microns) after wherein adding hydrotalcite powder 1 kilogram, and 0.5% bromine, and 60 grams of initiator-benzoyl peroxide, and adding 2.0 kilograms of blowing agent pentane to seal the reactor. After thorough stirring, the temperature of the suspension was raised to 90°C for one hour, 100°C for one hour, 110°C for one hour, and 130°C for two hours while maintaining the pressure at 7 atmospheres. Finally, after filtering, washing and drying, the modified expandable polystyrene beads are obtained, and the fire rating can meet the requirements of B1 or B2.

Embodiment 2

[0017] Example 2: Preparation of expandable polystyrene beads by melt mixing modification of polystyrene and brucite

[0018] Polystyrene resin and 9.5wt% brucite powder (average particle size 50 microns) and 1.8% red phosphorus, 1.5% antimony trioxide powder were melt-extruded in a screw extruder and passed through an underwater pelletizing system Obtain bead-shaped particles, disperse the particles in deionized water, add emulsifying dispersant and foaming agent pentane, and pour the foaming agent into the autoclave at 130°C to maintain 7 atmospheres to obtain brucite Modified expandable polystyrene beads, the fire rating can meet the requirements of B1 or B2.

Embodiment 3

[0019] Example 3: Preparation of flame-retardant expandable polystyrene beads by talcum powder-red phosphorus coating

[0020] Select the solution of polystyrene dissolved in toluene as the coating film-forming substance, 95 grams of talc micropowder, 15 grams of micropowder red phosphorus, and make a solution with suitable viscosity, and use a sugar coating machine or a dynamic fluidization device to continuously and vigorously stir At the same time, spray the coating liquid configured above onto the surface of 1 kg of ordinary expandable polystyrene beads, and use hot air to dry the volatile matter in the coating, and finally make the film-forming substance firmly adhere to the polystyrene particles , to obtain talc-red phosphorus-coated modified expandable polystyrene beads.

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PUM

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Abstract

The invention relates to an inorganic powder modification process for expandable polystyrene particles and components of the expandable polystyrene particles. The expandable polystyrene particles comprise not more than 10 mass percent of inorganic powder as flame-retardant enhancing materials, wherein the inorganic powder materials mainly comprise natural mineral powder, and can be added into a system before, during or after the polymerization reaction of polystyrene. Due to the special physical and chemical properties of the inorganic powder or under the coaction of the inorganic powder and other flame retardants, the obtained expandable polystyrene is endowed with high flame retardant and heat insulating properties.

Description

technical field [0001] The invention relates to an inorganic powder modification process of expandable polystyrene beads and its components, which include inorganic powder with a mass percentage not higher than 10w% (based on styrene polymer) as polystyrene Granular flame-retardant reinforcing materials, inorganic powder materials are mainly natural mineral powder, and can be added to the system before, during or after the polymerization of polystyrene, through the characteristics of this type of inorganic powder or combined with other types The combined action of flame retardants can obtain expandable polystyrene beads with excellent flame retardancy and heat insulation properties. Background technique [0002] Expandable polystyrene particles expandable polystyrene (EPS) has been developed by the German BASF company since the 1950s after its bead production process, because the molding process and equipment are simple and feasible, and can be made into products of various ...

Claims

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Application Information

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IPC IPC(8): C08L25/06C08K3/34C08K3/22C08K3/04C08K3/36C08K3/38C08J9/16C08J9/20C08J9/18
Inventor 罗付生
Owner 罗付生
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