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Preparation method of PET (Polyethylene Terephthalate) foamed beads for molding

A technology of foaming beads and molding, applied in the field of foaming materials, can solve the problems of inability to directly molding, troublesome processing of special-shaped parts, etc., to achieve the effect of development and promotion, get rid of less application, and solve the effect of agglomeration and precipitation

Pending Publication Date: 2022-05-13
WUXI HI TEC ENVIRONMENTAL MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional PET foam products are only plates and sheets. For special-shaped parts with complex structures, they can only be assisted by electrothermal cutting and bonding, and cannot be directly molded. Therefore, the processing of special-shaped parts is very troublesome.

Method used

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  • Preparation method of PET (Polyethylene Terephthalate) foamed beads for molding
  • Preparation method of PET (Polyethylene Terephthalate) foamed beads for molding
  • Preparation method of PET (Polyethylene Terephthalate) foamed beads for molding

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Embodiment

[0030] Embodiment: A preparation method of PET foam beads for molding, selecting a PET raw material with a melting point of 120°C-180°C and a hydroxyl content≤30mol / t, comprising the following steps:

[0031] 1. PET pretreatment: The selected PET raw materials are subjected to high-temperature drying treatment, the specific conditions are: temperature 100-120 ° C, stirring and drying for 6-12 hours, after completely removing the residual water vapor of the PET raw materials, the PET drying materials to be used are obtained. raw material;

[0032] 2. Pretreatment of auxiliary materials: Dry the anti-hydrolysis agent, chain extender and nucleating agent separately. The specific conditions are 80°C and dry for 6-12 hours. Proportionally weighed and dispersed through a high-speed mixer for later use, the addition ratio of each auxiliary material is as follows: the anti-hydrolysis agent is 0.5-2% of the raw material weight, the chain extender is 0.5-2% of the raw material weight, a...

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Abstract

The preparation method of the PET foamed beads for molding comprises the following steps: step 1, drying a PET raw material to obtain a standby PET dried raw material; step 2, respectively drying an anti-hydrolysis agent, a chain extender and a nucleating agent, mixing and uniformly dispersing to obtain a standby auxiliary material; 3, a wetting agent accounting for 0.5%-2% of the weight of the raw materials is added into the PET dry raw materials and fully mixed, then spare auxiliary materials are added, and pre-foaming master batch is obtained after even mixing; step 4, carrying out wire drawing granulation on the pre-foamed master batch to obtain a special PET foaming material, and drying the special PET foaming material; step 5, putting the dried special PET foaming material into a reaction kettle, adding water according to the material-water ratio of 0.02-0.5, then adding kaolin accounting for 0.15-0.3% of the water amount and butter accounting for 0.2-0.4% of the water amount, uniformly mixing, and adjusting the water density in the reaction kettle to 1.2-1.35 g / cm < 3 >; controlling the temperature of the reaction kettle to be 110-150 DEG C and the back pressure to be 4-8 MPa by adopting a carbon dioxide pressurization mode to obtain the PET foamed beads with the density of 20-200 g / l. The product provided by the invention can be used for steam molding, and the required special-shaped part can be obtained by changing the mold structure.

Description

technical field [0001] The invention belongs to the field of foam materials, and in particular relates to a method for preparing PET foam beads for molding. Background technique [0002] Polyethylene terephthalate (PET for short), with its extremely low dielectric constant, high thermal stability and excellent mechanical properties, has a wide range of applications in our lives. The PET foam obtained by modifying and foaming it combines the lightweight, excellent wear resistance, surface retardation and heat insulation characteristics of the foam material, and is widely used in construction, vehicles, high-speed rail, and roof insulation materials , sports equipment, wind power generation and other fields. In particular, PET foam can be recycled, so it has good environmental protection characteristics. [0003] PET foam is usually used as an interlayer in structural filling. Its excellent shear resistance makes its service life longer and more stable than that of general f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08L27/18C08K5/29C08K3/38C08K3/34C08J9/12C08J9/00
CPCC08J9/122C08J9/0061C08J9/0095C08J2367/02C08J2427/18C08J2203/06C08K5/29C08K2003/387C08K3/346
Inventor 杨亮炯曾佳朱民刘缓缓何若虚
Owner WUXI HI TEC ENVIRONMENTAL MATERIAL CO LTD
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