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Process for the production of polyurethane molded articles

A technology of molded products and production methods, applied in the direction of chemical instruments and methods, layered products, layered product processing, etc., can solve the problem of limited quantity of polyurethane

Inactive Publication Date: 2005-12-28
BAYER MATERIALSCIENCE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, due to the tendency of the applied liquid polyurethane mixture to drip, the amount of polyurethane that can be applied is limited

Method used

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  • Process for the production of polyurethane molded articles
  • Process for the production of polyurethane molded articles
  • Process for the production of polyurethane molded articles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Example 1 (according to the invention)

[0053] Addition of gaseous CO to component A of formulation 1 using a star type hollow shaft stirrer 2 . After feeding, measure 420kg / m by liter meter 3 polyol density.

[0054] Use 450g / m of crushed glass fiber 2 The area weight is applied to both sides of the core layer consisting of corrugated cardboard 5 / 5 type 10mm thick paper honeycomb and at room temperature using a total amount of 450g / m 2 The join CO 2 The polyurethane formulation 1 was sprayed.

[0055] This interlayer was placed into a sheet forming mold into which a sharp-edged flat sheet of steel measuring 6x30x300 mm was previously inserted for forming. The sandwich was then compressed to a wall thickness of 9.8 mm, heated to 130° C. in a mold, and the sandwich was more strongly compressed to a wall thickness of 3.8 mm in the region of the planar steel insert.

[0056] Regions that are more strongly compressed have sharp edge definitions, such as figure 1 ...

Embodiment 2

[0057] Example 2 (Compared)

[0058] The experiment described in Example 1 was repeated with the difference that no CO was added to the formulation 2 .

[0059] Regions that are more strongly compressed have defective edge definition, such as figure 2 shown.

Embodiment 3

[0060] Example 3 (according to the invention)

[0061] Gas CO was added to polyurethane forming formulation 1 as in Example 1 2 .

[0062] Use 450g / m of crushed glass fiber 2 The area weight is applied to both sides of the core layer consisting of corrugated cardboard 5 / 5 type 40mm thick paper honeycomb and at room temperature using a total amount of 550g / m 2 The join CO 2 The polyurethane formulation 1 was sprayed. Furthermore, during spraying, in the area of ​​subsequent shaping, chopped glass fibers of type 816, 2400 tex / Muhlmerier are applied by a cutting machine, type SW2 / Wolfangel.

[0063] This sandwich was placed into a sheet forming mold which, through corresponding depressions in the upper part of the mold, allowed the formation of a cylindrical dome 35 mm high and 50 mm in diameter. The sandwich was then compressed to a wall thickness of 17 mm, heated in a mold to 130° C., corresponding to less pronounced compression of the dome area.

[0064] The formed dom...

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PUM

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Abstract

The present invention relates to a process for the production of polyurethane molded articles, wherein the polyurethane forming mixture applied to the reinforcing fiber layer or reinforcing fiber mat comprises a gas and a foam stabilizer. These moldings are used in automotive and construction applications and in furniture.

Description

technical field [0001] The present invention relates to a process for the production of polyurethane (PU) molded articles, in particular PU sandwich structural components, and their use. Background technique [0002] Production methods for sandwich elements for planar panel manufacture have been known for some time. Sandwich construction consists of a light and compression resistant core with high strength cover layers. This composite structure is formed from a PU reactive mixture that, when applied on both sides in a thermocompression molding process, can form a strong bond. The inner core layer of the sandwich structure preferably consists of a cardboard with a honeycomb structure, which during the compression process acts as a spacer for the covering layer moistened by PU. The wetting of the interlayer cover is preferably carried out by spraying. Since the two-sided application can be carried out simultaneously with this orientation, the substrate carrier is robot-guid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C44/12B29C44/14B29C70/08B29C70/28B32B5/22B32B27/04B32B27/12B60R13/02C08G18/48C08J5/00C08J5/04
CPCB29C44/1209B29C70/086B29C70/088B32B5/22C08G18/4812C08G2110/0008B29C43/00B29C44/12B29C44/16B32B27/12B32B27/18B32B27/40B32B2250/40B32B2266/00B32B2305/28B32B2309/02B32B2310/04B32B2375/00B32B2419/00B32B2605/08
Inventor H·-G·维尔茨A·西曼内克R·保罗D·维格纳
Owner BAYER MATERIALSCIENCE AG
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