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Processing technology for surface modification of prefoaming polystyrene particles

A technology of polystyrene particles and expanded polystyrene, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of increasing difficulty in the molding process

Inactive Publication Date: 2010-01-06
罗付生
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method must be applied after the EPS is foamed and dried in time, which adds a certain degree of difficulty to the subsequent molding process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Preparation of reinforced and toughened expanded polystyrene molded products

[0023] A Prepare the coating liquid:

[0024] Select 30 grams of polyurethane prepolymer with a polymerization degree of 150-200 as the coating film-forming substance, and use 50 milliliters of ethyl acetate and 50 milliliters of xylene as solvents to prepare a solution with suitable viscosity.

[0025] B Coating treatment on pre-expanded polystyrene particles:

[0026]Use a sugar coating machine or a dynamic fluidization device to spray the above-mentioned coating liquid onto the surface of 1 kg of pre-expanded particles while stirring continuously and vigorously, and use hot air to dry the volatile components in the coating, and finally make the finished product The film substance is firmly attached to the pre-expanded polystyrene particles to obtain pre-expanded polystyrene particles with good surface treatment.

[0027] C. Foaming treatment of pre-expanded polystyrene particl...

Embodiment 2

[0029] Example 2: Preparation of Flame Retardant Enhanced Expanded Polystyrene Molded Products

[0030] A Prepare the coating solution:

[0031] Select 30 grams of acrylic resin prepolymer with a polymerization degree of 200-250 as the coating film-forming material, use 100 ethyl acetate as the solvent, and add 15 grams of micronized red phosphorus as a flame-retardant functional additive to prepare a solution with a suitable viscosity.

[0032] B coating on pre-expanded polystyrene particles

[0033] Use a sugar coating machine or a dynamic fluidization device to spray the above-mentioned coating liquid onto the surface of 1 kg of pre-expanded particles while stirring continuously and vigorously, and use hot air to dry the volatile components in the coating, and finally make the finished product The film substance is firmly attached to the pre-expanded polystyrene particles, and the surface-treated flame-retardant pre-expanded polystyrene particles are obtained.

[0034] C ...

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Abstract

The invention relates to a processing technology and a formula thereof for the surface modification of prefoaming polystyrene particles. In the invention, surface preprocessing is mainly carried out on prefoaming polystyrene particles before foaming, a functional coating is coated on the surfaces of the prefoaming polystyrene particles sold in the market, and the main filming high molecular substances of the functional coating comprise the following components: a polyurethane prepolymer, an acrylic resin prepolymer, a vinyl acetate polymer and the like; the corresponding adopted solvents comprise acetone, toluene chloroform, dimethyl formamide, ethyl acetate and the like. The coating has the capability of generating proper deformation when being heated and softened and can deform and expand along with the heating and foaming process of inner-layer polystyrene, the surface layers of surface layer components can mutually generate a chemical crosslinking reaction at high temperature and high pressure in a moulding process, acting force between the foamed polystyrene particles is enhanced, and the toughness, the compressive strength and the impact resistance of a modified foamed polystyrene product can all be greatly enhanced.

Description

technical field [0001] The invention relates to a surface modification treatment process and formulation of pre-expanded polystyrene particles. Styrene particles and the expanded polystyrene products molded therefrom have better mechanical properties, and can play the functions of strengthening, toughening and the like. Background technique [0002] Pre-expanded polystyrene particles expandable polystyrene (EPS) since the German BASF company developed its bead production process in the 1950s, because the molding process and equipment are simple and feasible, and can be made into products of various shapes and densities, so develop rapidly. Now it has become one of the important varieties in the three major products of styrene resin (GPPS, HIPS, EPS). The production methods of EPS include one-step impregnation process and two-step impregnation process. The so-called one-step method means that the polymerization and foaming agent impregnation are completed once in the same ...

Claims

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Application Information

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IPC IPC(8): C08J9/224C08J9/228C08L25/06C09D175/04C09D133/00
Inventor 罗付生
Owner 罗付生
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