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Method for preparing low-density TPU bead foam by extrusion foaming based on coupling modification of polytetrafluoroethylene and talc powder

A kind of polytetrafluoroethylene, extrusion foaming technology

Active Publication Date: 2021-03-16
福建鑫瑞新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the extrusion and foaming preparation technology of TPU bead foam is still immature, and the main problem is that the prepared TPU bead foam has a high density (the density is generally greater than 0.2g / cm 3 ), large shrinkage, uneven structure, high porosity and other defects, the main reasons are poor viscoelasticity of TPU melt and slow crystallization rate

Method used

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  • Method for preparing low-density TPU bead foam by extrusion foaming based on coupling modification of polytetrafluoroethylene and talc powder
  • Method for preparing low-density TPU bead foam by extrusion foaming based on coupling modification of polytetrafluoroethylene and talc powder
  • Method for preparing low-density TPU bead foam by extrusion foaming based on coupling modification of polytetrafluoroethylene and talc powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] The raw material is polyester TPU with a hardness of 80A and a density of 1.20g / cm 3 (@23 ℃), the addition amount is 87.7wt%; The mesh number of PTFE solid powder is 100 mesh, and the addition amount is 2wt% (mass fraction); The mesh number of talcum powder is 3000 mesh, and the addition amount is 4wt%; The critical fluid I is carbon dioxide with a purity of 99.9%, and the supercritical fluid II is nitrogen with a purity of 99.5%. The injected amount of carbon dioxide is 6.0wt%, and the injected amount of nitrogen is 0.3wt%.

[0060] The twin-screw temperature is set to 180°C; the barrel temperature of the twin-screw extruder is set to 60°C–160°C–180°C–180°C–180°C–180°C–180°C–180°C–180°C from the hopper to the extrusion port ℃–180℃–170℃–170℃, the screw speed is 30 rpm; the temperature of the static mixer is set to 150℃; the control pressure of the gear pump is set to 12.5MPa, and the temperature of the gear pump is set to 150℃ ; The temperature of the melt cooler is se...

Embodiment 2

[0063] The raw material is polyether TPU with a hardness of 85A and a density of 1.20g / cm 3 (@23 ℃), the addition is 87.8wt%; The order number of PTFE solid powder is 400 orders, and the addition is 6wt%; The order number of talcum powder is 5000 orders, and the addition is 2wt%; Supercritical fluid I is Carbon dioxide with a purity of 99.9%, supercritical fluid II is nitrogen with a purity of 99.5%; the injected amount of carbon dioxide is 4.0wt%, and the injected amount of nitrogen is 0.2wt%.

[0064] The twin-screw temperature is set at 200°C; the barrel temperature of the twin-screw extruder is set at 60°C–160°C–180°C–200°C–200°C–200°C–200°C–200°C–190°C from the hopper to the extrusion port ℃–190℃–180℃–180℃, the screw speed is 40 rpm; the temperature of the static mixer is set to 160℃; the control pressure of the gear pump is set to 16MPa, and the temperature of the gear pump is set to 160℃; The temperature of the melt cooler is set to 140°C; the temperature of the extrus...

Embodiment 3

[0067] The raw material is polyether TPU with a hardness of 95A and a density of 1.20g / cm 3 (@23 ℃), the addition is 89.6wt%; The order number of PTFE solid powder is 1000 orders, and the addition amount is 3wt%; The order number of talcum powder is 5000 orders, and the addition amount is 5wt%; Supercritical fluid I is Carbon dioxide with a purity of 99.9%, supercritical fluid II is nitrogen with a purity of 99.5%; the injected amount of carbon dioxide is 2.0wt%, and the injected amount of nitrogen is 0.4wt%.

[0068] The twin-screw temperature is set to 220°C; the barrel temperature of the twin-screw extruder is set to 60°C–160°C–200°C–210°C–220°C–220°C–220°C–220°C–210°C from the hopper to the extrusion port ℃–200℃–180℃–180℃, the screw speed is 25 rpm; the temperature of the static mixer is set to 170℃; the control pressure of the gear pump is set to 20MPa, and the temperature of the gear pump is set to 170℃; The temperature of the melt cooler is set to 145°C; the temperatur...

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Abstract

The invention provides a method for preparing low-density TPU bead foam through extrusion foaming based on polytetrafluoroethylene and talcum powder coupled modification. The low-density TPU bead foamis prepared through extrusion foaming based on polytetrafluoroethylene (PTFE) and talcum powder coupled modification, and the method comprises the following materials in a formula: 85-98 wt% of TPU,0.5-10 wt% of PTFE, 0.5-8 wt% of talcum powder, 0-10 wt% of supercritical carbon dioxide and 0-1 wt% of supercritical nitrogen. A foamed product prepared according to the method is of a finer, more uniform, neater, and higher-porosity cell structure, the foaming ratio of the foamed product can be up to ten times and above, the density of the foamed product can be lower to 0.1 g / cm<3>, the percentage of close area is 96% or above, and the bead foam is uniform in appearance, lustrous, and easy for realizing later steam mould shaping.

Description

technical field [0001] The invention relates to the technical field of preparation of microporous plastics, in particular to a method for preparing low-density thermoplastic polyurethane bead foam by extrusion foaming based on polytetrafluoroethylene and talcum powder coupling modification. Background technique [0002] Thermoplastic polyurethane (TPU) bead foam is a kind of bead-shaped substance with a porous structure obtained by foaming thermoplastic polyurethane as a matrix. Through steam molding or bonding molding, TPU bead foam can be processed into a block foam product with a certain geometric structure, which has the characteristics of light weight, high elasticity, heat insulation, noise reduction, and toughness, and can be widely used in In sports equipment, packaging, construction, transportation, safety protection and other industries. At present, TPU bead foam is mainly prepared by autoclave pressure foaming method. The process control of the kettle pressure f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/08C08L75/06C08L27/18C08K3/34C08J9/12B29C48/92
CPCC08J9/0061C08J9/0066C08J9/122C08J2203/06C08J2203/18C08J2203/182C08J2205/052C08J2375/06C08J2375/08
Inventor 王桂龙赵国群潘涵遇
Owner 福建鑫瑞新材料科技有限公司
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