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TPU sheet foaming process

A sheet and process technology, applied in the field of polymer preparation, can solve problems such as uncontrollable product quality, cumbersome procedures, and low production efficiency, and achieve the effects of reducing production equipment investment, reducing costs, and improving production efficiency

Inactive Publication Date: 2019-12-03
锋特(福建)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

[0005] The above-mentioned patent adopts the TPU material foaming process, which is mainly used to make TPU particle foaming materials. If downstream manufacturers want to make insoles, they also need to mold TPU foaming particles. The process is cumbersome, the production efficiency is low, and the product quality cannot be controlled.

Method used

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  • TPU sheet foaming process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] S10 sheet material preparation, heating the TPU raw material with a hardness of 85A to a molten state, and preparing a 4mm thick TPU original plate by heating and forming; S20 shearing, cutting the TPU original plate into a first TPU plate of 15*7cm; S30 Infiltration, the first TPU plate is placed in a 5L autoclave and sealed, and supercritical CO is introduced into the autoclave 2 to a pressure of 15MPa, and the temperature was raised to 60°C, and the CO 2 Evacuate quickly; then pass supercritical N into the autoclave 2 to a pressure of 5MPa, and the temperature was raised to 50°C, and the N 2 Empty quickly; take out the swollen first TPU sheet from the autoclave to obtain a second TPU sheet; S40 foaming, place the second TPU sheet in a constant temperature device at 95°C for 3 minutes to foam to obtain foaming The final TPU sheet; S50 holding pressure, the TPU sheet is dried and placed in a closed high-pressure container, and 0.5:1 CO is introduced into the high-pre...

Embodiment 2

[0045] S10 sheet material preparation, heating the TPU raw material with a hardness of 85A to a molten state, and preparing a 1.8 thick TPU original plate by heating and forming; S20 shearing, cutting the TPU original plate into a first TPU plate of 15*15cm; S30 Infiltration, the first TPU plate is placed in a 5L autoclave and sealed, and supercritical CO is introduced into the autoclave 2 to a pressure of 13MPa, and the temperature was raised to 55°C, and the CO 2 Evacuate quickly; then pass supercritical N into the autoclave 2 to a pressure of 5MPa, and the temperature was raised to 55°C, and the N 2 Rapid emptying; take out the swollen first TPU sheet from the autoclave to obtain the second TPU sheet; S40 foaming, place the second TPU sheet in a constant temperature device at 85°C for 30s to obtain foaming The final TPU sheet; S50 pressure keeping, the TPU sheet is dried and placed in a closed high-pressure container, and 1:1 CO is passed into the high-pressure container....

Embodiment 3

[0050] S10 sheet material preparation, heating the TPU raw material with a hardness of 85A to a molten state, and preparing a 3mm thick TPU original plate by heating and forming; S20 shearing, cutting the TPU original plate into a first TPU plate of 15*7cm; S30 Infiltration, the first TPU plate is placed in a 5L autoclave and sealed, and supercritical CO is introduced into the autoclave 2 to a pressure of 15MPa, and the temperature was raised to 55°C, and the CO 2 Evacuate quickly; then pass supercritical N into the autoclave 2 to a pressure of 5.5MPa, and the temperature was raised to 55°C, and the N 2 Fast emptying; take out the swollen first TPU sheet from the autoclave to obtain a second TPU sheet; S40 foaming, place the second TPU sheet in a water bath constant temperature equipment at 90°C for 2.5 minutes to foam to obtain The TPU sheet after foaming; S50 holding pressure, the TPU sheet is dried and placed in a closed high-pressure container, and 0.8:1 CO is introduced...

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Abstract

The invention provides a TPU sheet foaming process which comprises the following steps: preparing a sheet to obtain a TPU raw plate; shearing to obtain a first TPU plate; soaking, namely putting the first TPU plate into a high-pressure kettle, sealing, introducing supercritical CO2 into the high-pressure kettle until the pressure is 8-30MPa, heating to 50-85 DEG C, maintaining the pressure and theconstant temperature for 1.5-5 hours, and quickly emptying CO2; introducing supercritical N2 into the high-pressure kettle until the pressure is 5-20 MPa, heating to 50-85 DEG C, maintaining the pressure and the constant temperature for 0.5-2 hours, and quickly emptying N2; taking out the swollen first TPU plate from the high-pressure kettle to obtain a second TPU plate; and foaming to obtain theTPU sheet. The invention discloses a TPU sheet foaming process. The TPU sheet is directly prepared through foaming by adopting an infiltration process combining supercritical CO2 and supercritical N2, the product prepared by adopting the process is good in flatness and plumpness, the phenomena of edge curling and the like are avoided, the production convenience is provided for downstream manufacturers, and the equipment investment of the downstream manufacturers is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of polymer preparation, in particular to a TPU sheet foaming process. Background technique [0002] TPU (Thermoplastic polyurethanes) is called thermoplastic polyurethane elastomer rubber, which is a kind of polymer material between rubber and plastic. TPU has high modulus, high strength, high elongation and high elasticity, and its hardness range is wide (60HA-85HD ), wear resistance, oil resistance, aging resistance, transparency, good elasticity, widely used in daily necessities, sporting goods, toys, decorative materials and other fields. [0003] Foaming TPU materials by physical or chemical methods to obtain micro-foamed TPU materials has broadened the application field of TPU materials and has attracted increasing attention. The traditional TPU foaming technology is based on peroxide bridging, and then foaming with chemical foaming agent to form a foam material with independent foam. The blowing age...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C44/60B29C44/34B29C69/00B29C73/02
CPCB29C44/3403B29C44/3415B29C44/3492B29C44/35B29C44/60B29C69/001B29C73/02
Inventor 许世贤陈金水
Owner 锋特(福建)新材料科技有限公司
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