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A thermoplastic polyurethane product molding process for special airtight clothing

A thermoplastic polyurethane and molding process technology, applied in the field of thermoplastic polyurethane, can solve the problems of uneven thickness, flow marks, bubbles, etc., and achieve the effect of high appearance and good gas tightness

Active Publication Date: 2020-02-11
HUBEI INST OF AEROSPACE CHEMOTECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a thermoplastic polyurethane product molding process for special airtight clothing consisting only of thermoplastic polyurethane elastomer components. Bubbles, flow marks, uneven thickness, etc.

Method used

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  • A thermoplastic polyurethane product molding process for special airtight clothing
  • A thermoplastic polyurethane product molding process for special airtight clothing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The process flow is as follows:

[0023] Step A: Preparation of thermoplastic polyurethane elastomer diaphragm: Add thermoplastic polyurethane pellets (referred to as TPU pellets) to the mixed solution of acetone and tetrahydrofuran with a mass ratio of 1:6, and the mass ratio of TPU pellets to solvent is 1:4, 30 Stir in a water bath until completely dissolved. Pour the solution into a stainless steel shallow dish, place it at room temperature for 5 hours, then put it in an oil bath oven at 70°C for 24 hours, and take out the diaphragm for later use;

[0024] Step B: Mold preheating: Put the single-opening cylindrical mold (see the attached product diagram) figure 1 ) placed in the middle of the heating plate of the rubber flat vulcanizing machine, pressurized at 3MPa, and turned on the flat vulcanizing machine to heat until the mold temperature stabilized to 155°C;

[0025] Step C: pressurized cooling molding: remove the preheated mold from the flat vulcanizing machi...

Embodiment 2

[0029] The process flow is as follows:

[0030] Step A: Preparation of thermoplastic polyurethane elastomer diaphragm: Add TPU pellets to the mixed solution of acetone and tetrahydrofuran with a mass ratio of 1:7, the mass ratio of TPU pellets to solvent is 1:6, and stir until completely in a water bath at 30°C dissolve. Pour the solution into a stainless steel shallow dish, place it at room temperature for 4 hours, then put it in an oil bath oven at 70°C for 24 hours, and take out the diaphragm for later use;

[0031] Step B: Mold preheating: Put the double-opening cylindrical mold (see the attached product diagram) figure 2 ) is placed in the middle of the heating plate of the rubber flat vulcanizing machine, pressurized at 3MPa, and the flat vulcanizing machine is turned on to heat until the mold temperature stabilizes to 160°C;

[0032] Step C: pressurized cooling molding: remove the preheated mold from the flat vulcanizing machine, open the mold, fill the diaphragm int...

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Abstract

Provided is a thermoplastic polyurethane product forming process for special airtight clothing. Thermoplastic polyurethane elastomer granules are added into a solvent to be dissolved so that a thermoplastic polyurethane elastomer solution can be obtained; solvent desorption of the thermoplastic polyurethane elastomer solution is performed so that membranes can be made; the membranes are placed into a preheated mold cavity; a mold is placed on a flat plate vulcanizing machine to be subjected to pressurizing and cooling forming; and after the mold is cooled, compressed air is adopted for pressurizing demolding. The thermoplastic polyurethane product forming process for the special airtight clothing solves the problems of bubbles, flow marks, uneven thickness and the like frequently happeningto other processes. The product compressive strength is high, and the thermoplastic polyurethane product forming process for the special airtight clothing is especially suitable for internal pressureclothing, inflatable toys and products with the gas sealing requirements.

Description

technical field [0001] The invention relates to the technical field of thermoplastic polyurethane (TPU for short) products and its production process, in particular to a molding process of thermoplastic polyurethane used for special airtight clothing. Background technique [0002] Thermoplastic polyurethane is an elastomeric material between rubber and plastic. Due to its excellent tensile properties, wear resistance, flex resistance, low temperature resistance and oil resistance, it is widely used in the automotive industry, various shoe materials and clothing industries, and aerospace fields. [0003] At present, TPU has a variety of molding processes, because of its low melting point, blow molding, injection molding and other processes are generally used in industry. Most of the reported TPU molding processes are TPU sheets or composite TPU foam materials, and most of them are breathable materials, which are often used in shoe materials and other fields. There is no rep...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C43/02B29C43/50B29C43/58B29K75/00B29L31/48
CPCB29C43/003B29C43/02B29C43/50B29C43/58B29C2043/5053B29C2043/5808B29C2043/5816B29K2075/00B29L2031/48
Inventor 陈兵勇李杰张万欣李猛上官绪水赵志祥冉倩王凡李彦荣熊中年魏荣梅
Owner HUBEI INST OF AEROSPACE CHEMOTECHNOLOGY
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