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A kind of thermoplastic polyester extrusion foam molding method
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A technology of extrusion foaming and molding method, applied in the field of thermoplastic polyester extrusion foaming molding, can solve the problems of difficulty in obtaining foamed products, rough surface of products, escape, etc., and achieve the effect of avoiding thermal decomposition and high-quality production
Active Publication Date: 2020-07-17
BEIJING UNIV OF CHEM TECH +1
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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
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Embodiment 1
[0040] Raw materials: polyethylene terephthalate (PET), BG80, Sinopec Yizheng Chemical Fiber Co., Ltd., intrinsic viscosity 0.8dl / g;
[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 blowing 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
Disclosed is a thermoplastic polyester extrusion foam molding method, comprising melting a thermoplastic polyester, a lubricant and a foaming aid in a twin-screw extruder, the exit pressure of the twin-screw extruder being 3 MPa to 10 MPa; supplying and mixing a physical foaming agent into the thermoplastic polyester melt, and feeding the mixture via a melt pump to a single screw extruder, the inlet pressure of the single screw extruder being 15 MPa to 25 MPa; and lowering the temperature of the thermoplastic polyester melt comprising the physical foaming agent by means of the single screw extruder, subjecting the thermoplastic polyester melt to extrusion foaming through a die, and cooling and forming the extrudate to obtain a thermoplastic ester foamed product. By adding a high-temperature-resistant lubricant and using a melt pump for regulation, the method achieves thermoplastic polyester foam molding with high efficiency, stability and quality.
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...
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