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Method for preparing thermoplastic elastomer by supercritical fluid assisted dynamic vulcanization

A thermoplastic elastomer and supercritical fluid technology, which is applied in the production of bulk chemicals, etc., can solve the problems such as the method and application of SCF auxiliary polymer, which is easy to realize and popularize, improve mechanical properties, and reasonable operation process. Effect

Inactive Publication Date: 2009-06-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the patent does not mention the method and application of SCF-assisted polymer reaction molding processing

Method used

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  • Method for preparing thermoplastic elastomer by supercritical fluid assisted dynamic vulcanization
  • Method for preparing thermoplastic elastomer by supercritical fluid assisted dynamic vulcanization
  • Method for preparing thermoplastic elastomer by supercritical fluid assisted dynamic vulcanization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] figure 1 Show the concrete structure that realizes the inventive method to carry out plastics / rubber dynamic vulcanization with twin-screw extruder, by figure 1 It can be seen that the SCF-assisted polymer reaction molding processing equipment includes twin-screw extruder A, supercritical CO 2 Delivery system B, vacuum pump C and online rheological system D; supercritical CO 2The delivery system B is connected with the self-locking gas injection check valve 4; the self-locking gas injection check valve 4, the pressure sensor 9, the vacuum pump C and the online rheological system D are sequentially connected with the twin-screw extruder A along the extrusion direction. connect. Described twin-screw extruder A comprises feeder 7, machine barrel 8, screw rod (not shown in the figure) and pressure sensor 9, the rear end of machine barrel 8 links to each other with feeder 7, and the periphery of machine barrel 8 There is a temperature control heating ring (not shown in th...

Embodiment 2

[0039] (1) Weigh 20 parts of polypropylene, 80 parts of EPDM rubber, 5 parts of sulfur, 1 part of accelerator CZ (N-cycloethyl-2-benzothiazole sulfenic acid amine), 2 parts of accelerator Agent DM (dibenzothiazole disulfide), 4 parts of stearic acid, 8 parts of zinc oxide, mixed together.

[0040] (2) Add the mixture in the step (1) to continuous supercritical carbon dioxide assisted polymer extrusion equipment, under the conditions that the supercritical carbon dioxide content is 2.5% of the total mass of the material, the reaction extrusion temperature is 160 ° C, and the extrusion time is 7 minutes Next, the polypropylene / EPDM thermoplastic elastomer can be obtained by extruding through the machine head.

Embodiment 3

[0042] (1) Weigh 60 parts of polypropylene, 40 parts of nitrile rubber (NBR), 4 parts of dicumyl peroxide, 4 parts of stearic acid, and 8 parts of zinc oxide and mix them together.

[0043] (2) Add the mixture in the step (1) to continuous supercritical carbon dioxide assisted polymer extrusion equipment, under the conditions that the supercritical carbon dioxide content is 1.5% of the total mass of the material, the reaction extrusion temperature is 180 ° C, and the extrusion time is 10 minutes Next, the polypropylene / nitrile rubber thermoplastic elastomer can be obtained by extruding through the machine head.

[0044] It can be seen from Table 3 that the supercritical CO 2 During the preparation of PP / NBR thermoplastic elastomers by assisted dynamic vulcanization, the motor current of the extruder was in supercritical CO 2 In the case of joining, there is a relatively large decrease.

[0045] Table 3 Motor current of PP / NBR(60 / 40) thermoplastic elastomer during preparation...

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Abstract

The invention discloses a method for preparing a plastic / rubber thermoplastic elastomer by supercritical fluid assisted dynamic vulcanization. The method comprises the followings steps: (1) mixing plastic, rubber and a vulcanization system at a certain proportion, and putting the mixture into an extruder or an injection molding machine to mix, fuse and plasticize the polymer into a fusant; (2) controlling gas to be in a supercritical state by a supercritical fluid conveying system and injecting the gas into a cylinder of the extruder or the injection molding machine; (3) mixing the injected supercritical fluid with the polymer fusant and the vulcanization system; (4) causing a chemical reaction of the plastic, the rubber and the vulcanization system, which is promoted by the supercritical fluid; and (5) releasing the supercritical fluid from the polymer fusant at the pressure which is lower than a critical value, converting the supercritical fluid into gas to be discharged by a vacuum pump. The supercritical fluid assisted plastic / rubber dynamic vulcanization can promote dispersion and size decrease of the rubber phase in the plastic, and effectively reduce processing energy consumption for extrusion or injection shaping.

Description

technical field [0001] The invention relates to polymer reaction processing molding technology, in particular to a method for preparing plastic / rubber thermoplastic elastomers through supercritical fluid-assisted dynamic vulcanization. Background technique [0002] In the field of polymer processing, supercritical fluid (SCF) technology, as a relatively new green technology, has been widely concerned by researchers from theoretical research to engineering application in the past two decades. The application of SCF technology in polymer processing has the following characteristics: (1) can reduce processing temperature and energy consumption; (2) can change the degree of dissolution of SCF in polymer by adjusting temperature and pressure; (3) plasticizing effect of SCF It can greatly improve the diffusion rate and dissolution degree of small molecules and other media in the swollen polymer; (4) Most SCF is a gas at normal temperature and pressure, and it can quickly escape fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08L23/12C08L23/16C08L9/02C08L7/00C08L23/06C08L27/06
CPCY02P20/54
Inventor 黄汉雄陈玉坤赵杨
Owner SOUTH CHINA UNIV OF TECH
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