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Expandable polystyrene resin particles and process for producing same

A technology of polystyrene and resin particles, which can be used in heating methods, air conditioning systems, applications, etc., and can solve the problems of reduced thermal insulation effect of glass wool

Inactive Publication Date: 2013-08-28
SEKISUI PLASTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, glass wool tends to reduce the thermal insulation effect due to moisture absorption, so it cannot be expected to have a high thermal insulation effect for a long time, and there are also problems in workability

Method used

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  • Expandable polystyrene resin particles and process for producing same
  • Expandable polystyrene resin particles and process for producing same
  • Expandable polystyrene resin particles and process for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0145] Supply 120g tricalcium phosphate (manufactured by Daping Chemical Co., Ltd.), 2.4g sodium dodecylbenzenesulfonate, 160g benzoyl peroxide (purity 75% by weight), 30g tert-butyl peroxide-2-ethylhexyl monocarbonate, 40 kg of ion-exchanged water, and 40 kg of styrene monomer were stirred by rotating the stirring blade at a rotation speed of 100 rpm to form an aqueous suspension.

[0146] Then, while the stirring blade was rotated at a rotational speed of 100 rpm to stir the aqueous suspension, the temperature in the autoclave was raised to 90° C. and kept at 90° C. for 6 hours, and the temperature in the autoclave was further raised to 120° C. °C and kept at 120 °C for 2 hours, so that the suspension polymerization of styrene monomer was carried out.

[0147] Then, cool the temperature in the autoclave to 25°C, take out the polystyrene particles from the autoclave, repeat washing and dehydration several times, and after the drying process, classify the polystyrene particles...

Embodiment 2

[0157] 6 g of sodium dodecylbenzenesulfonate and 112 g of magnesium pyrophosphate obtained by the double decomposition method were supplied to 2 kg of ion-exchanged water and stirred, then heated to 50° C. and maintained, while adding 240 g of styrene and 440 g of terrazzo to the above-mentioned ion-exchanged water. Flame retardant A and 140g flame retardant auxiliary agent dicumyl peroxide, use a homomixer (manufactured by Special Machine Chemical Industry Co., Ltd., T.K.Homomixer MARKII fmodel) to stir for 30 minutes at 7000rpm to make flame retardant A and flame retardant auxiliary The flame retardant is completely dissolved therein to form a flame retardant solution, and the flame retardant solution is dispersed in ion-exchanged water to form a dispersion of the flame retardant solution. Next, expandable polystyrene particles were obtained in the same manner as in Example 1, except that the dispersion of the obtained flame retardant solution was supplied into the autoclave ...

Embodiment 3

[0159] Except having changed the flame retardant A to 360 g instead of 440 g, it carried out similarly to Example 2, and obtained the expandable polystyrene-type particle|grains.

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Abstract

[OBJECT] The object of the present invention is to provide a molded foam product in which a flame retardant having no accumulating property in a living body and satisfactory handling property during the production process is dissolved in a plasticizer so that the flame retardant can be uniformly impregnated into resin particles, and which shows excellent heat-fusibility between the particles during molding without resulting in uneven cell density upon expanding, and has excellent flame retardancy and heat resistance. [MEANS OF REALIZING THE OBJECT] The expandable polystyrene resin particles are prepared by supplying a flame-retardant solution to the aqueous suspension before or during impregnating polystyrene resin particles dispersed in an aqueous suspension with a blowing agent, in which the flame-retardant solution is prepared by dissolving in a plasticize 33 to 1,000 parts by weight of powdery flame retardant relative to 100 parts by weight of the plasticizer and 20 to 200 parts by weight of flame retardant aid having a 1-hour half-life temperature of 100 to 250°C relative to 100 parts by weight of the plasticizer and impregnating the polystyrene resin particles with the flame retardant and the flame retardant aid, wherein the powdery flame retardant comprises tetrabromocyclooctane that is preliminarily dispersed by silica fine powders and the silica fine powders are contained in 0.3 to 1.5 parts by weight relative to 98.5 to 99.7 parts by weight of the tetrabromocyclooctane.

Description

technical field [0001] The present invention relates to foamable resin particles excellent in flame retardancy and heat insulation, which are excellent in foamability and can be used in building heat insulating materials such as base materials for roofs, heat insulating materials for hot water tanks of water heaters, and the like, and a method for producing the same . Background technique [0002] Conventionally, expandable polystyrene resin particles have generally been used as expandable resin particles. Expandable polystyrene-based resin particles are used as heat insulating materials for pipes, heat insulating materials for roofs, automobile parts, heat insulating materials for solar energy systems, and the like because of their excellent workability and heat insulating properties. Among them, the polystyrene-based foam molded body used for the thermal insulation material of the hot water storage tank of the water heater has a certain standard of heat insulation in orde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/18B29C44/00C08K3/36C08K5/02C08L25/04B29K25/00
CPCC08J9/0019F24F2221/30C08K3/36B29C44/3461C08J2325/06C08J9/18C08K5/02C08J9/0066C08J9/224C08J9/232C08J9/16B29C44/00C08L25/04
Inventor 坂本航士山田一己地海良辅
Owner SEKISUI PLASTICS CO LTD
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