Method for preparing rubber-toughened PS foam material through extrusion of supercritical fluid

A supercritical fluid and rubber toughening technology, which is applied in the field of supercritical fluid extrusion to prepare rubber toughened PS foam materials, can solve the problems of complex process, non-continuous production, toxic and side effects, etc., and achieve simple process and improve mechanical properties. The effect of high performance and productivity

Active Publication Date: 2015-09-02
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The application with publication number CN101565510A discloses a method for preparing microcellular foamed plastics based on PS material, but the method adopts intermittent foaming method, the process is complex, continuous production is not possible, and the efficiency is low
The applications with publication numbers CN101619139A and CN102643490A disclose the extrusion molding preparation method of microcellular foamed plastics based on PS material, while the application with publication number CN103665619A uses toxic and side effects, flammable and explosive chemical blowing agents, and these patents The application does not involve the preparation method of supercritical fluid foaming material of rubber toughened PS system

Method used

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  • Method for preparing rubber-toughened PS foam material through extrusion of supercritical fluid
  • Method for preparing rubber-toughened PS foam material through extrusion of supercritical fluid
  • Method for preparing rubber-toughened PS foam material through extrusion of supercritical fluid

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Embodiment 1

[0039] In this embodiment, a method for preparing rubber-toughened polystyrene foam material with supercritical fluid extrusion molding technology, the raw materials include polystyrene, SBS and nano-calcium carbonate; the weight of each raw material is in parts, polystyrene It is 80 parts, SBS is 20 parts, and nanometer calcium carbonate is 1 part.

[0040] The method for preparation comprises the following steps:

[0041] (1) polystyrene, SBS and nano-calcium carbonate are mixed according to the proportioning ratio, and are sent into the first extruder for melt blending and extruded granulation to obtain the polystyrene-based blend of the three-phase system;

[0042] The first extruder adopts a three-screw extruder, the blending temperature is 160-190°C, and the screw speed of the first extruder is 55 rpm;

[0043](2) Send the polystyrene-based blend into the second extruder for heating and melting, and at the same time inject the supercritical fluid into the plasticizing s...

Embodiment 2

[0048] This embodiment is a method for preparing rubber-toughened polystyrene foam material by supercritical fluid extrusion molding technology. The raw materials include polystyrene, SBS and nano-calcium carbonate; wherein, the weight of each raw material is in parts, poly Styrene is 80 parts, SBS is 20 parts, and nano calcium carbonate is 3 parts.

[0049] The method for preparation comprises the following steps:

[0050] (1) polystyrene, SBS and nano-calcium carbonate are mixed according to the proportioning ratio, and are sent into the first extruder for melt blending and extruded granulation to obtain the polystyrene-based blend of the three-phase system;

[0051] The first extruder adopts a three-screw extruder and the blending temperature is 160-190°C, and the screw speed of the first extruder is 55 rpm;

[0052] (2) Send the polystyrene-based blend into the second extruder for heating and melting, and at the same time inject the supercritical fluid into the plasticizi...

Embodiment 3

[0057] In this embodiment, a method for preparing rubber-toughened polystyrene foam material with supercritical fluid extrusion molding technology, the raw materials include polystyrene, SBS and nano-calcium carbonate; the weight of each raw material is in parts, polystyrene It is 80 parts, SBS is 20 parts, and nanometer calcium carbonate is 5 parts.

[0058] The method for preparation comprises the following steps:

[0059] (1) polystyrene, SBS and nano-calcium carbonate are mixed according to the proportioning ratio, and are sent into the first extruder for melt blending and extruded granulation to obtain the polystyrene-based blend of the three-phase system;

[0060] The first extruder adopts a three-screw extruder and the blending temperature is 160-190°C, and the screw speed of the first extruder is 55 rpm;

[0061] (2) Send the polystyrene-based blend into the second extruder for heating and melting, and at the same time inject the supercritical fluid into the plasticiz...

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Abstract

The invention discloses a method for preparing rubber-toughened PS foam material through extrusion of a supercritical fluid. The rubber-toughened PS foam material is prepared from the following raw materials in parts by weight: 80-95 parts of polystyrene, 5-20 parts of a thermoplastic elastomer and 1-10 parts of one or more nucleating agents. The method comprises the following steps: mixing such raw materials according to a proportion; feeding the mixed raw materials into a first extruder for melt-blending and extrusion pelletization to obtain a rubber-toughened polystyrene-based blend containing the nucleating agents; feeding the rubber-toughened polystyrene-based blend into a second extruder for heating and melting; meanwhile, injecting the supercritical fluid into a plasticization section of the second extruder to ensure that a homogeneous phase system is formed between the supercritical fluid and a melt of the rubber-toughened polystyrene-based blend under the shearing action of a threaded rod of the second extruder; continuously extruding the supercritical fluid for foaming. The rubber-toughened PS foam material prepared according to the method is uniform in cell, small in cell size, high in processing operability and anti-impact property, and suitable for industrialized production.

Description

technical field [0001] The invention relates to the technical field of preparation of high-performance polystyrene (PS) microcellular foaming materials, in particular to a method for preparing rubber-toughened PS foaming materials by supercritical fluid extrusion. Background technique [0002] Microcellular foamed plastic is a composite material formed by uniformly dispersing cells formed by gas expansion in a polymer matrix. It has the advantages of low density, high impact strength, high specific strength, good sound insulation and heat insulation, and strong hygroscopicity. However, microcellular foamed plastic products obtained by traditional chemical foaming methods are difficult to avoid the residue of foaming agent, which is easy to cause pollution to the environment, endanger human health, and the cost is high. [0003] Using supercritical fluids as physical blowing agents (such as supercritical CO 2 and N 2 ) to prepare microcellular foamed plastics, which has the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L25/06C08L53/02C08K3/26C08J9/12B29C47/92B29C48/92
Inventor 彭响方王元盛陈斌艺米皓阳经鑫余鹏
Owner SOUTH CHINA UNIV OF TECH
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