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Nontoxic, odorless and recoverable environmentally-friendly polyurethane foaming material and preparation method thereof

A polyurethane, odor-free technology, applied in coatings and other directions, can solve problems such as excessive foaming of the core layer, optimizing the mechanical properties of materials, and inability to reduce weight.

Active Publication Date: 2011-11-02
浙江博发新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As we all know, this microcellular foaming technology of extrusion injection molding is difficult to overcome the defect of uneven distribution of cells in the surface layer and the core layer, that is, the surface layer is an unfoamed skin layer, while the core layer is excessively foamed, and it is not easy to obtain high foaming. Foaming material with uniform ratio and cell size distribution
The cell density of the foam given in the examples is only 12×10 3 / cm 3 The cell diameter is 50-90 μm, which is much lower than the cell density of the microcellular foam material with the same cell diameter at least >10 6 / cm 3 , it can be inferred that the cells of such a foamed material are distributed discretely in the material entity, which cannot maximize the weight reduction and optimize the mechanical properties of the material

Method used

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  • Nontoxic, odorless and recoverable environmentally-friendly polyurethane foaming material and preparation method thereof
  • Nontoxic, odorless and recoverable environmentally-friendly polyurethane foaming material and preparation method thereof
  • Nontoxic, odorless and recoverable environmentally-friendly polyurethane foaming material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Different kinds of polyurethane raw material particles are respectively placed in the high-pressure mold of the molded physical gas foaming device to ensure that the total volume of the particles does not exceed 1 / 25 of the mold volume, so that the particles have enough space for foaming. When the mold reaches the set temperature, a certain pressure of N 2 or CO 2 , constant temperature and pressure for a period of time, and then release the pressure to normal pressure at a certain speed. The foamed material was taken out and subjected to optical microscope analysis and density measurement, the results are shown in Table 1.

[0046] Table 1 Comparison of structural properties of foamed materials of different types of polyurethane raw materials

[0047]

Embodiment 2

[0049] Place No. 2 and No. 3 samples in the high-pressure mold of the physical gas foaming device, so that the total volume of the particles does not exceed 1 / 25 of the mold volume, so that the particles have enough space for foaming. When the mold reaches the set temperature, fill it with 20MPa N 2 , kept at constant temperature and pressure for a certain period of time, and then released to normal pressure at a speed of 28MPa / s. The foamed material was taken out and subjected to optical microscope analysis and density measurement, the results are shown in Table 2.

[0050] Table 2 Comparison of structural properties of polyurethane foam materials prepared at different foaming temperatures

[0051]

Embodiment 3

[0053] Place the No. 2 sample in a high-pressure mold in a molding physical gas foaming device to ensure that the total particle volume does not exceed 1 / 25 of the mold volume, so that the particles have enough space for foaming. When the mold reaches 160°C, fill it with 10MPa N 2 , kept at constant temperature and pressure for a period of time, and then released to normal pressure at a rate of 15MPa / s. The foamed material was taken out and subjected to optical microscope analysis and density measurement, the results are shown in Table 3.

[0054] Table 3 Comparison of structural properties of polyurethane foam materials prepared with different holding times

[0055]

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Abstract

The invention discloses a nontoxic, odorless and recoverable environmentally-friendly polyurethane foaming material and a preparation method thereof. The foaming material is characterized in that a raw material of polyurethane is adopted and is directly subjected to a physical gas foaming in the presence of a physical gas foaming agent to prepare the foaming material. The foaming material has a foaming density of 0.08-0.80 g / cm<3>, a foaming ratio of 1.5-15 times, a average pore diameter of 10-100 [mu]m, uniform distribution of cells, wherein diameter deviations of 95% of the cells do not exceed 10% of the average pore diameter. In addition, the foaming material has no surface structure and can be the foaming material with any shape. The foaming material has an adjustable softness and hardness and excellent performance, and can be widely applicable for the fields of packaging, human protector, shoe product, automobile inner garnish, amortization cushion, building energy conservation, acoustic insulating material and the like. According to the present invention, the following problems that: harmful gas is discharged during the production process of the polyurethane foaming material, and monomer residues are harmful to human health and cause environmental pollution, are thoroughly solved from the source, such that a practicable development approach is provided for green environmental protection, energy saving and emission reduction of the foaming material.

Description

Technical field: [0001] The invention relates to a non-toxic, odorless and recyclable environmentally friendly polyurethane foam profile and a preparation method thereof, belonging to the field of high polymer physical gas foam materials. Background technique: [0002] Polymer foam material is a kind of aggregate formed by gas dispersed in solid polymer, which has the advantages of light weight, heat insulation, cushioning and insulation, so it has a wide range of applications in many fields. Polyurethane foam material is one of the most important foam materials, it has a large amount, a wide range of applications, and is irreplaceable. [0003] At present, the method of producing polyurethane foam materials is mainly the chemical foaming method, that is, various raw materials such as isocyanate, polyol, catalyst, external foaming agent, crosslinking agent, etc. are mixed uniformly in a certain proportion and then injected into the mold. Foaming is carried out during the re...

Claims

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Application Information

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IPC IPC(8): C08J9/12C08J9/14C08L75/04B29C41/52B29C47/92B29C44/60C08J9/228B29C48/92
Inventor 李文光虞晨阳王亚吴炳田
Owner 浙江博发新材料股份有限公司
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