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Foaming thermoplastic polyurethane bead and preparation method thereof

A technology of thermoplastic polyurethane and plastic polyurethane, applied in the field of foamed thermoplastic polyurethane beads and its preparation, can solve the problems of coarse size, environmental pollution, etc., achieve the effects of small deformation, high product yield, and avoid size shrinkage

Active Publication Date: 2014-03-19
MIRACLL CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention mainly solves the problem that the existing thermoplastic polyurethane foam beads have relatively thick cell structure size, the foaming process is easy to cause environmental pollution, and the slits, holes, wrinkles or tortoise shells will be generated at the welded surface between the beads of the molded product. Stretch marks and other issues

Method used

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  • Foaming thermoplastic polyurethane bead and preparation method thereof
  • Foaming thermoplastic polyurethane bead and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1, with 100Kg TPU particle A shown in table 1, 1Kg dihydroxypropyl octadecanoate, 1Kg EVA drops into twin-screw extruder after mixing homogeneously by high-speed mixer and carries out melt kneading; Melt kneading The material is extruded into strips from a die head with a diameter of 2 mm in the extruder, then cooled and shaped in a water tank, and cut with a pelletizer to obtain thermoplastic polyurethane particles T1;

[0043] Add 100Kg of thermoplastic polyurethane particles T1 obtained above and 400Kg of water into the autoclave, add 40Kg of carbon dioxide foaming agent while stirring, raise the temperature of the autoclave to 118°C, then keep the temperature at this temperature for 2 hours, and finally Open the discharge valve at the bottom of the autoclave to discharge the mixed solution in the autoclave into the atmosphere, thereby obtaining foamed thermoplastic polyurethane beads F1; the obtained foamed thermoplastic polyurethane beads have a density o...

Embodiment 2

[0045] Embodiment 2, 100Kg TPU particle B shown in table 1, 5Kg sorbitan laurate monoester, 15Kg PVC drop into twin-screw extruder after mixing homogeneously by high-speed mixer and carry out melt kneading; Extrude into strips from a die with a diameter of 2 mm in the extruder, then cool and shape in a water tank, and cut with a pelletizer to obtain thermoplastic polyurethane particles T2;

[0046] Except adopting thermoplastic polyurethane particle T2, foaming temperature is set to 116 ℃, constant temperature is 3 hours, 1Kg nitrogen is used as foaming agent, 1.1 bar of water vapor, obtain foamed thermoplastic polyurethane beads F2 according to the same method as Example 1 Compared with foamed thermoplastic polyurethane molded foam products, performance evaluation is shown in Table 2.

Embodiment 3

[0047] Embodiment 3, 100Kg TPU particle C shown in table 1, 10Kg fatty acid sucrose ester, 35Kg ABS are put into twin-screw extruder after mixing homogeneously by high-speed mixer and melt kneading; Extrude into strips from a die head of 2 mm, then cool and shape in a water tank, and cut with a pelletizer to obtain thermoplastic polyurethane particles T3;

[0048] In addition to using thermoplastic polyurethane particles T3, the foaming temperature is set to 115 ° C, constant temperature for 4 hours, 28Kg of carbon dioxide and nitrogen mixed gas as a foaming agent, 1.0 bar of water vapor; according to the same method as in Example 1 to obtain foaming The performance evaluation of thermoplastic polyurethane beads F3 and foamed thermoplastic polyurethane molded foam products is shown in Table 2.

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Abstract

The invention discloses a foaming thermoplastic polyurethane bead. The foaming bead comprises 100 parts of thermoplastic polyurethane particles, 1-10 parts of cell size stabilizer, and 1-35 parts of melt viscosity modifier. The bead is prepared through the following steps: steeping the thermoplastic polyurethane particles containing a cell size stabilizer and a melt viscosity modifier in an aqueous suspension and foaming by volatilizing foaming agent. The melt viscosity of the foaming thermoplastic polyurethane bead is 8000-15000 poise below 180 DEG C, the size of the prepared foaming thermoplastic polyurethane bead is stable, the diameter of the cell is uniform, the surface is bright, the yield of the product is high, the foaming thermoplastic polyurethane bead has good sintering property even under lower vapor pressure, and the molding foam product deforms slightly and has low shrinking percentage compared with the size of the die, good dimensional stability and attractive appearance.

Description

Technical field: [0001] The invention relates to the technical field of foaming materials, in particular to a foamed thermoplastic polyurethane bead and a preparation method thereof. The molded foamed product made of the foamed bead can be used for cushioning packaging materials, thermal insulation materials , bedding (such as pillows, mattresses), leisure places (such as floor coatings), shock-absorbing and energy-absorbing materials (such as car bumper core materials). Background technique: [0002] Using plastic as a matrix, a large number of air bubbles are filled inside the plastic by physical or chemical methods to obtain a polymer foam material. Foam materials have a series of advantages such as low density, heat and sound insulation, high specific strength, and cushioning, so they are widely used in the fields of packaging, industry, agriculture, transportation, military industry, aerospace industry, and daily necessities. Commonly used types of foam are polyurethan...

Claims

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Application Information

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IPC IPC(8): C08L75/04C08J9/18
Inventor 王仁鸿王光阜张生孙其军赵玮
Owner MIRACLL CHEM
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