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Composite semifinished products and mouldings produced therefrom and directly produced mouldings based on hydroxy-functionalized (meth)acrylates and uretdiones which are crosslinked by means of radiation to give thermosets

A technology of acrylate and molded products, which is applied in the field of preparing storage-stable polyurethane prepregs to achieve good mechanical properties, high flexibility, and good weather resistance

Inactive Publication Date: 2015-12-23
EVONIK DEGUSSA GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These systems have the disadvantage of high melt viscosity or the use of solvents which have to be removed during this or may also have attendant toxicological disadvantages

Method used

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  • Composite semifinished products and mouldings produced therefrom and directly produced mouldings based on hydroxy-functionalized (meth)acrylates and uretdiones which are crosslinked by means of radiation to give thermosets
  • Composite semifinished products and mouldings produced therefrom and directly produced mouldings based on hydroxy-functionalized (meth)acrylates and uretdiones which are crosslinked by means of radiation to give thermosets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] The prepreg of Example 1 exhibited a weight loss of about 34% based on the substrate after drying.

[0111] The impregnated glass fiber mat was pressed at 180° C. and 50 bar for 1 hour (Polystat 200T from the company Schwabenthan) and was completely crosslinked there. The hard, rigid, chemical resistant and impact resistant composite component (sheet material) has a Tg of 119°C.

[0112]

[0113] The starting materials in this table were mixed intimately in a pre-mixer and then dissolved. The mixture can be stored for about 1 to 2 years without gelling, under conditions where light is excluded.

[0114] To prepare the prepreg, the glass fiber woven is impregnated with a solution of the matrix material. Then use UVLED lamps below (Heraeus Water-cooled heat sink, wavelength: 395±5nm, power density: 8W / cm at 5mm operating distance 2 ;Launch window: 251×35mm 2 ) was dried at 1.5 m / min. The fiber mass content determined in Example 1 was 54%. The prepreg of Example...

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Abstract

The invention relates to a process for producing polyurethane prepregs which are stable during storage, and to mouldings (composite components) produced therefrom. The prepregs or components are produced by mixing, for example, (meth)acrylate monomers, (meth)acrylate polymers, hydroxy-functionalized (meth)acrylate monomers and / or hydroxy-functionalized (meth)acrylate polymers with uretdione materials. Optionally, photoinitiators can also be added. This mixture or solution is applied by known processes to fibre material, e.g. carbon fibres, glass fibres or polymer fibres, and is polymerized with the aid of radiation or plasma applications. Polymerization, e.g. at room temperature or at up to 80 DEG C, gives thermoplastics or, respectively, thermoplastic prepregs which can subsequently be subjected to forming processes. By using elevated temperature, the hydroxy-functionalized (meth)acrylate constituents can then be crosslinked with the uretdiones already present in the system. It is thus possible to produce dimensionally stable thermosets and, respectively, crosslinked composite components.

Description

technical field [0001] The present invention relates to a process for producing storage-stable polyurethane prepregs and to moldings (composite components) produced therefrom. To prepare the prepregs and / or components, for example (meth)acrylate monomers, (meth)acrylate polymers, hydroxyl-functionalized (meth)acrylate monomers and / or hydroxyl-functionalized The (meth)acrylate polymer is mixed with uretdione material. A photoinitiator may also optionally be added. This mixture or solution is applied by known methods to fibrous materials, such as carbon fibers, glass fibers or polymer fibers, and polymerized by means of radiation or plasma application. After polymerization, for example at room temperature or at temperatures up to 80° C., thermoplastics or thermoplastic prepregs are produced, which can then also be shaped. The hydroxy-functional (meth)acrylate component can then crosslink with the uretdione already present in the system by means of elevated temperature. In th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/28C08J5/24
CPCB29C70/50C08G18/672C08G18/798C08G18/8025C08F290/067C08J2375/04C08F297/06C08F220/20C08J5/245C08J5/244C08J5/246C08J5/243C08J5/249C08F220/14B29C43/003B29K2033/08B29K2033/12C08J3/24C08J3/28C08J5/043C08J2375/06
Inventor E·施皮鲁G·施米特F·G·施密特S·雷默斯B·奥尔兰德M·施皮特勒H·勒施
Owner EVONIK DEGUSSA GMBH
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