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Low density rigid reinforced polyurethanes and a process for their production

A technology of polyurethane and density, applied in the field of low-density rigid reinforced polyurethane, can solve the problem that the rapid demoulding time is not long enough

Inactive Publication Date: 2011-10-05
BAYER MATERIALSCIENCE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the rapid demold times reported in the examples of 43-45 seconds for 0.5 inch flat panels are not long enough to produce larger articles by RIM, Enhanced RIM or LFI methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-15

[0075] Formulations that can be used to produce composite articles according to the above procedure are given in Tables 1-4 below. These examples illustrate various specific polyurethane-forming compositions suitable for use in the practice of this invention. Use a different isocyanate or mixture of isocyanates in each table. Amounts stated in Tables 1-4 are parts by weight, based on the total weight of the polyurethane-forming mixture, except that glass is expressed in weight percent.

[0076] Table 1

[0077] Example

[0078] Table 2

[0079] Example

[0080] table 3

[0081] Example

[0082] Polyol K

[0083] Table 4

[0084] Example

[0085] EG

Embodiment 16-20

[0087] These examples are given to illustrate the effect of the amount of dissolved carbon dioxide on the density, gel time and strength properties of rigid polyurethane composites produced from "typical" polyurethane-forming mixtures.

[0088] In each of Examples 16-20, CO dissolved in the polyol component of a typical polyurethane-forming mixture 2 The amount varied from 0.4 g / L to 1.4 g / L. The mixture was then poured into a steel mold measuring 24" by 24". The properties of the polyurethane compounds produced are shown in Table 5.

[0089] table 5

[0090] Example

[0091] Notch Izod

[0092] In an attempt to further reduce the density of the composite article by adding 0.2-0.5% water to the resin, the gel time was shortened from 32 seconds to 28-25 seconds, resulting in a product with poor surface quality.

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PUM

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Abstract

Fiber-reinforced polyurethanes having densities no greater than 0.9 g / cc which are suitable for use as automotive components are produced from a polyurethane-forming reaction mixture in which carbon dioxide is dissolved in one or both of the reaction components. The amount of dissolved carbon dioxide is from 0.2 to 2.0 g / l. The isocyanate-reactive component is a polyol having a functionality of from 3 to 8 and a hydroxyl number of at least 600. Any fibrous material may be used but glass fiber, particularly glass fibers having lengths from 12.5 to 100 mm are particularly preferred.

Description

technical field [0001] The present invention relates to low density (ie density less than 0.9 g / cm3) rigid reinforced polyurethanes suitable for the production of molded articles, especially composite articles, and methods for producing such low density rigid reinforced polyurethanes. Background of the invention [0002] One of the most common methods of reducing the density of polymeric materials such as polyurethane is the use of blowing agents. A number of blowing agents can be used to produce polymers with reduced density. Examples of such known blowing agents include hydrochlorofluorocarbons ("HCFCs"), hydrofluorocarbons ("HFCs") and hydrocarbons such as pentane. However, since HCFC, HFC and hydrocarbon blowing agents increase the cost of polyurethane production and may cause adverse environmental impacts, water is a particularly preferred blowing agent. [0003] Although the density of polyurethanes can be reduced by simply adding more water to the polyurethane-formi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/04C08K7/14C08G18/48C08G18/72C08G18/08
CPCC08G2101/0025C08J2375/04C08G18/482C08G18/10C08J9/122C08G18/5021C08G2101/0066C08J9/0085C08G2110/0025C08G2110/0066C08G18/36
Inventor U·E·尤尼斯
Owner BAYER MATERIALSCIENCE AG
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