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Extrusion foaming thermoplastic polyurethane elastomer bead and preparation method thereof

A thermoplastic polyurethane, extrusion foaming technology, applied in the field of foaming materials, can solve problems such as environmental pollution, high cost, and complicated foaming process, and achieve the effects of no environmental pollution, stable quality, and uniform density distribution

Active Publication Date: 2014-04-09
MIRACLL CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention mainly solves the problems that the existing intermittent kettle pressure foaming process is complicated, high in cost, serious in environmental pollution, and requires special explosion-proof treatment for the equipment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0027] For the preparation of raw material thermoplastic polyurethane elastomer particles: it is usually produced by mixing isocyanate, an active hydrogen compound with a molar mass of 500-10000g / mol and a chain extender with a molar mass of 50-500g / mol, and a catalyst is added during production; The following examples describe preferred starting materials for the production of thermoplastic polyurethane particles in the present invention:

[0028] Isocyanates include aliphatic, cycloaliphatic, aromatic and araliphatic; diisocyanates such as toluene diisocyanate (TDI), diphenylmethane-2,2'-, 2,4'- or 4,4'-diisocyanate are preferred Isocyanate (MDI), 3-isocyanatomethylene-3,5,5-trimethylcyclohexylisocyanate (IPDI), hexamethylene diisocyanate (HDI), dicyclohexylmethane diisocyanate (HMDI), 1 ,5-Naphthalene diisocyanate (NDI), p-phenylene diisocyanate (PPDI), 1,4-cyclohexane diisocyanate (CHDI), cyclohexane dimethylene diisocyanate (HXDI), particularly preferably diphenylmethane ...

Embodiment 1

[0035] Example 1, 100Kg of thermoplastic polyurethane (TPU) particles A shown in Table 1, 0.5Kg of talc, and 0.05Kg of antioxidant 1010 were mixed evenly, and then the above mixture was put into an extruder to granulate to obtain foamable Particles, the above-mentioned particles are finally put into a single-stage single-screw extruder, the extrusion speed of the material is controlled at 80Kg per hour, the injection speed of supercritical carbon dioxide is controlled at 0.8Kg per hour, the die head pressure is 1Mpa, and the die head temperature The water temperature of the underwater pelletizer is controlled at 70°C; the material can be continuously added according to the above-mentioned component ratio for continuous production, and the foaming density of the pellets obtained is 0.306g / cm 3 .

Embodiment 2

[0036]Example 2, 100Kg of thermoplastic polyurethane (TPU) particles B shown in Table 1, 0.01Kg of talc, and 0.2Kg of antioxidant 1010 were mixed evenly, and then the above mixture was put into an extruder to granulate to obtain foamable Particle, above-mentioned particle is dropped into single-stage single-screw extruder at last, and the extruding speed of material is controlled at extruding 55Kg per hour, and the injection speed of supercritical nitrogen is controlled at 6Kg per hour, and die head pressure is 12Mpa, and die head temperature is 185°C, the water temperature of the underwater pelletizer is controlled at 70°C; materials can be added continuously according to the above-mentioned component ratio for continuous production, and the foaming density of the obtained particles is 0.208g / cm 3 .

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Abstract

The invention discloses an extrusion foaming thermoplastic polyurethane elastomer bead. The extrusion foaming thermoplastic polyurethane elastomer bead comprises the following components in parts by weight: 100 parts of thermoplastic polyurethane elastomer, 0.01-0.5 parts of a foaming nucleating agent, and 0.01-0.2 parts of an antioxidant, wherein a foaming process adopts supercritical fluid with the addition amount of 1-40 parts. The invention also discloses a preparation method of the extrusion foaming thermoplastic polyurethane elastomer bead. The extrusion foaming thermoplastic polyurethane elastomer bead and the preparation method have the advantages that the foaming process does not cause environmental pollution; the obtained foaming material is stable in quality and high in foaming ratio; and the operation method in production is easy and suitable for continuous industrial production.

Description

Technical field: [0001] The invention relates to the technical field of foaming materials, in particular to extruding foamed thermoplastic polyurethane elastomer beads and a preparation method thereof. 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 polyurethane (PU) soft and rigid foam, polystyrene (PS) foam, polyethylene (PE) foam, polypropylene (PP) foam, etc. However, isocyanate is likely to remain in the foaming process of polyurethane foam, which is harmful to the human body, and the foamed material cannot be recycled. Pol...

Claims

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Application Information

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IPC IPC(8): C08L75/06C08L75/08C08J9/12B29C47/92B29B9/06B29C48/92
CPCB29B7/40B29B7/46B29B7/72B29B7/7404B29B9/065B29B9/12B29C48/04B29C48/397B29C48/92B29C2948/92514B29C2948/926B29C2948/92685B29C2948/92704B29C2948/92866B29C2948/92895B29C2948/92904B29C2948/92923
Inventor 王仁鸿王光阜张生孙其军赵玮
Owner MIRACLL CHEM
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