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Foaming type thermoplastic polyurethane particles and preparation method thereof

A thermoplastic polyurethane, foaming technology, applied in the field of foaming materials and its preparation, can solve the problems of large particle gap, large particle size, difficult feeding, etc., and achieves low dimensional shrinkage, excellent dimensional stability, and easy feeding. Effect

Active Publication Date: 2014-12-24
MIRACLL CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a foamed thermoplastic polyurethane particle and its preparation method to overcome the difficulty in feeding the foamed thermoplastic polyurethane particle into the mold due to the large particle size in the prior art, and to fill it between the particles after the mold The gap is large, and the surface of the molded product obtained by sintering the foamed particles by heating with water vapor is prone to defects such as cracks, holes, wrinkles or tortoise shells

Method used

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  • Foaming type thermoplastic polyurethane particles and preparation method thereof
  • Foaming type thermoplastic polyurethane particles and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Mix 100 parts of TPU particles with a MI of 5g / 10min and a hardness of 55A and 0.1g of talc through a high-speed mixer and put them into a twin-screw extrusion for melt mixing. MI is the melt index. The molten kneaded product was extruded from the die head of the extruder and subjected to underwater granulation to obtain thermoplastic polyurethane beads. The die used had 12 holes, each with a diameter of 0.6 mm, and the resulting thermoplastic polyurethane beads had an average diameter of 0.8-1.0 mm.

[0034] 100g of thermoplastic polyurethane beads and 400g of water were added to a 10L autoclave, and 30g of n-butane blowing agent was added while stirring. The autoclave was heated to 110°C, and then kept at this temperature for 20 minutes, the discharge valve at the bottom of the autoclave was opened, and the mixed liquid in the autoclave was discharged into the atmosphere, thereby obtaining foamed thermoplastic polyurethane particles P1. The obtained foamed thermoplas...

Embodiment 2

[0037] 100 parts of TPU granules with an MI of 21g / 10min and a hardness of 75A and 2g of silicon dioxide were uniformly mixed by a high-speed mixer and then put into twin-screw extrusion for melt mixing. The molten kneaded product was extruded from the die head of the extruder for underwater granulation to obtain thermoplastic polyurethane beads. The die used had 12 holes, each with a diameter of 0.8 mm, and the resulting thermoplastic polyurethane beads had a diameter of 1.0-1.2 m.

[0038] 100g of thermoplastic polyurethane beads and 400g of water were added to a 10L autoclave, and 35g of n-pentane blowing agent was added while stirring. Raise the temperature of the autoclave to 120°C and keep it at this temperature for 20 minutes, open the discharge valve at the bottom of the autoclave, and discharge the mixed liquid in the autoclave to the atmosphere, thereby obtaining foamable thermoplastic polyurethane particles P2. The particle density of foamed thermoplastic polyureth...

Embodiment 3

[0041] 100 parts of TPU granules with an MI of 50g / 10min and a hardness of 95A and 5g of zinc borate were mixed uniformly by a high-speed mixer and then put into a twin-screw extrusion for melt mixing. The molten kneaded product was extruded from the die head of the extruder for underwater granulation to obtain thermoplastic polyurethane beads. The die used had 12 holes each with a diameter of 1.2 mm, resulting in thermoplastic polyurethane beads with a diameter of 1.5-1.8 mm.

[0042] 100g of thermoplastic polyurethane beads and 400g of water were added into a 10L autoclave, and 10g of carbon dioxide blowing agent was added while stirring. The autoclave was heated to 135°C, and then kept at this temperature for 20 minutes, the discharge valve at the bottom of the autoclave was opened, and the mixed liquid in the autoclave was discharged into the atmosphere, thereby obtaining foamed thermoplastic polyurethane particles P3. The obtained expanded thermoplastic polyurethane part...

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Abstract

The invention relates to foaming type thermoplastic polyurethane particles and a preparation method thereof. The particles are prepared from the following components in parts by weight: 100 parts of thermoplastic polyurethane elastomer particles, 0.1-5 parts of a pore nucleating agent and 1-40 parts of a foaming agent. The average diameter of the foaming type thermoplastic polyurethane particles which is prepared by mixing the thermoplastic polyurethane elastomer particles and the pore nucleating agent in a certain ratio is 1-4mm, so that the particles can be easily charged, and can be fused and molded at a relatively low water vapor pressure during a moulding process; and a molded foam product prepared from the foaming type thermoplastic polyurethane particles has the advantages of small deformation, low size shrinkage rate relative to the die, excellent size stability and attractive appearance.

Description

technical field [0001] The invention relates to foamed thermoplastic polyurethane particles and a preparation method thereof, belonging to the field of foaming materials, preparation methods and applications thereof. Background technique [0002] Polymer foaming materials are based on polymers, and a large number of cell structures are generated inside the polymer matrix by physical or chemical methods. Because the unique cell structure of the foamed material endows it with a series of excellent properties, such as low density, heat and sound insulation, high specific strength, cushioning, etc., it is widely used in packaging, industry, agriculture, transportation, military industry, aerospace, etc. It has a wide range of applications in the fields of industry and daily necessities. Commonly used types of foam materials are polyurethane (PU) soft and rigid foam, polystyrene (PS) foam, polyethylene (PE) foam, polypropylene (PP) foam, etc. Polyurethane foam is prone to resid...

Claims

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Application Information

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IPC IPC(8): C08L75/04C08J9/14C08J9/16C08J9/228
Inventor 王仁鸿王光阜张生赵玮孙其军
Owner MIRACLL CHEM
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