Thermoplastic polyester extrusion foam forming method

A thermoplastic polyester and extrusion foaming technology, which is applied in the field of thermoplastic polyester extrusion foaming, can solve the problems of difficulty in obtaining foamed products, rough product surfaces, and difficulty in melt transportation, avoiding thermal decomposition, The effect of high-quality production

Active Publication Date: 2019-04-12
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This causes the viscosity of the system to increase suddenly during the extrusion chain extension reaction, which increases the pressure and torque in the extrusion system, making it difficult for the melt to be transported downstream of the machine head, and the excessively high melt viscosity and The elasticity of the melt makes it prone to serious melt fracture when the melt passes through the small die gap of the foaming head, resulting in rough product surface and gas escape, such as shark skin phenomenon, and it is difficult to obtain qualified foamed products

Method used

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  • Thermoplastic polyester extrusion foam forming method
  • Thermoplastic polyester extrusion foam forming method
  • Thermoplastic polyester extrusion foam forming method

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Raw materials: polyethylene terephthalate (PET), BG80, Sinopec Yizheng Chemical Fiber Co., Ltd., intrinsic viscosity 0.8dl / g;

[0041] Chain extender, pyromellitic anhydride (PMDA), Sinopharm Chemical Reagent Co., Ltd.;

[0042] Nucleating agent: talcum powder, 1000 mesh;

[0043] Antioxidant: tetrakis (β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate) pentaerythritol ester (antioxidant 1010), Nanjing Hualiming Chemical Co., Ltd.;

[0044] Lubricant: Pentaerythritol stearate PETs, Jiangsu Xingtai Photochemical Auxiliary Co., Ltd., thermal decomposition temperature 400 ° C. The decomposition temperature was tested by a thermogravimetric analyzer, the heating rate was 10°C / min, the atmosphere was nitrogen, and the temperature at which the thermogravimetric rate was the largest on the TG temperature curve was defined as the thermal decomposition temperature. image 3 It is the thermal weight loss curve of pentaerythritol stearate.

[0045] Foaming process: Preheat the e...

Embodiment 2

[0049] Raw materials and technology are with embodiment 1, and difference is that lubricant pentaerythritol stearate is added in the form of master batch, master batch concentration 50wt%, master batch matrix is ​​PET, and addition is 6% of PET gross weight, adds up to pentaerythritol The added amount of stearic acid ester is 3wt% of the total weight of PET.

Embodiment 3

[0051] The raw materials and process are the same as in Example 1, except that the chain extender adopts epoxy-based chain extender, ADR4368 of BASF Company, and the addition amount is 1wt%; the lubricant adopts modified ethylene bis stearic acid amide EBS, and thermally decomposes The temperature is 300°C, added in the form of 50% masterbatch concentration, the amount of masterbatch added is 10wt% of the total weight of PET, and the foaming agent is CO 2and cyclopentane, injected from two sets of pumping systems and two gas injection ports respectively, CO 2 The injection amount of the injection is 1wt% of the total weight of PET, and the injection amount of cyclopentane is 2wt% of the total weight of PET.

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Abstract

The invention provides a thermoplastic polyester extrusion foam forming method. The thermoplastic polyester extrusion foam forming method comprises the following steps that thermoplastic polyester, alubricant and a blowing promoter are added in a double-screw extruder for smelting, wherein the pressure of an outlet of the double-screw extruder is 3MPa-10MPa; a physical blowing agent is introducedin a thermoplastic polyester melt, and the mixture is conveyed to a single-screw extruder by a melt pump after mixing, wherein the pressure of an inlet of the single-screw extruder is 15MPa-25MPa; and the temperature of the thermoplastic polyester melt containing the physical blowing agent is lowered by the single-screw extruder, extruding and foaming are conducted with a die, and a thermoplasticpolyester foamed product is obtained after cooling and forming. The high temperature resistant lubricant is added and the melt pump is adopted for adjusting and controlling, so that efficient, stableand high-quality production of thermoplastic polyester foaming and forming is achieved.

Description

technical field [0001] The invention relates to a polymer extrusion molding method, in particular to a thermoplastic polyester extrusion foam molding method. Background technique [0002] Foam plastic is a composite material with plastic as the matrix filled with a large number of bubbles, so it has excellent properties such as light weight, material saving, high specific strength, low thermal conductivity, heat insulation and sound insulation, and can absorb impact loads, so it is widely used as Packaging, heat insulation, anti-freezing and heat preservation, cushioning and anti-vibration, and sound-absorbing materials have been widely used in construction, transportation, daily necessities, packaging, aerospace, navigation, and national defense. Traditional polymer foams such as polyurethane foam (PU), polyethylene foam (PE) and polystyrene foam (PS) have certain deficiencies in the properties of the material itself and processing methods. For example, polyurethane foam w...

Claims

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Application Information

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IPC IPC(8): B29C48/375B29C48/92C08J9/14C08L67/02C08K13/02C08K3/34C08K5/134C08K5/20
CPCC08J9/0023C08J9/0066C08J9/0095C08J9/122C08J9/141C08J2201/03C08J2203/06C08J2203/14C08J2203/182C08J2367/02
Inventor 信春玲张飞飞吴仲景何亚东李东生
Owner BEIJING UNIV OF CHEM TECH
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