Efficient production of composite semifinished products and components in a wet pressing method using hydroxy functionalized (meth)acrylates which are duroplastically crosslinked using isocyanates or uretdiones

A technology of isocyanate components and composite materials, applied in the direction of synthetic resin layered products, chemical instruments and methods, lamination, etc., to achieve the effect of improving heat deformation resistance

Inactive Publication Date: 2017-04-19
EVONIK DEGUSSA GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages of these systems are the high melt viscosity or the use of solvents which have to be removed during this period or which may also present their own disadvantages from a toxicological point of view

Method used

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  • Efficient production of composite semifinished products and components in a wet pressing method using hydroxy functionalized (meth)acrylates which are duroplastically crosslinked using isocyanates or uretdiones
  • Efficient production of composite semifinished products and components in a wet pressing method using hydroxy functionalized (meth)acrylates which are duroplastically crosslinked using isocyanates or uretdiones

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0131] Table 1

[0132]

[0133] To manufacture the assembly, 10 layers of glass fiber cloth are stacked on top of each other in a metal mold measuring 25×25 cm and purged with nitrogen.

[0134] The ingredients in this table were mixed in a premixer and then dissolved. This mixture can be used at room temperature for about 15 minutes before it gels.

[0135] The matrix is ​​then applied to the fibers. During the closing operation, this matrix distributes and wets the reinforcing fibers within the mold. After 20 minutes, the reaction at room temperature is completely over and the preform (here synonymous with semi-finished product) can be removed from the mold. The preform of Example 1 exhibited a weight loss, based on the matrix, of approximately 2% by weight after the reaction.

[0136] The preform was then pressed in another mold at 180° C. and 50 bar for 1 hour, during which time the matrix material was completely crosslinked. The hard, rigid, chemical and impact r...

Embodiment 2

[0138] In Example 2, it proceeds analogously to Example 1. The only difference is the use of a resin component that additionally contains non-(meth)acrylic polyols. The composition is derived from Table 2.

[0139] The implementation procedure of embodiment 2 is carried out according to embodiment 1. The weight loss of the preform after the reaction was determined here to be 1% by weight instead of 2% by weight as in Example 1. The hard, rigid, chemical and impact resistant composite component (sheet) has a glass transition temperature T of 80°C g And overall slightly more flexible than the sheet from Example 1.

[0140] Table 2

[0141]

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Abstract

The invention relates to a method for producing composite semi-finished products and components. In order to produce the semifinished products or components, (meth)acrylate monomers, (meth)acrylate polymers, multi-functionalized (meth)acrylates, hydroxy functionalized (meth)acrylate monomers, and/or hydroxy functionalized (meth)acrylate polymers are mixed with di- or poly isocyanates or uretdione materials. The liquid mixture is applied onto fiber materials, such as carbon fibers, glass fibers, or polymer fibers for example, using known methods and polymerized using a first temperature increase, a redox accelerator, or a photo-initiation. After the polymerization process, for example at room temperature or a temperature of up to 120 DEG C, thermoplastics are produced which can then still be deformed. The hydroxy functionalized (meth)acrylate components can then be crosslinked with the isocyanates or uretdiones which are already present in the system in a press at a second temperature which is at least 20 DEG C higher than the polymerization temperature. At the same time, the final component is shaped in said press. In this manner, dimensionally stable duroplastics or crosslinked composite components can be produced.

Description

technical field [0001] The invention relates to a method of manufacturing composite semi-finished products and components. For the manufacture of semi-finished products or components, (meth)acrylate monomers, (meth)acrylate polymers, polyfunctional (meth)acrylates, hydroxyl functional (meth)acrylate monomers and / or hydroxyl Functionalized (meth)acrylate polymers mixed with di- or polyisocyanates or with uretdione materials. This liquid mixture is applied according to known methods to fiber materials, for example carbon fibers, glass fibers or polymer fibers, and the polymerization is initiated by means of a first temperature increase, a redox accelerator or by means of photoinitiation. For example, after polymerization at room temperature or at a temperature of up to 120° C., thermoplastics or weakly crosslinked systems result, which can be shaped during the polymerization or subsequently. The hydroxy-functional (meth)acrylate component can then be crosslinked in a press at ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B9/00B32B5/02B32B9/04B32B5/26B32B17/02B32B17/12B32B27/34B32B27/02B32B27/12B32B18/00B32B9/02B32B7/08B32B33/00B32B37/10B29C70/28C08J5/04C08J3/24C08K5/29C08J5/24C08L33/04
CPCB29C70/28B32B5/024B32B5/26B32B7/08B32B15/14B32B33/00B32B37/10C08J3/24C08J5/04C08K5/29C08L33/04B32B2307/4026B32B2307/51B32B2262/101B32B2262/106B32B2262/105B32B2262/0276B32B2260/046B32B2260/021B32B2605/18B32B2605/12B32B2605/00C08J5/244B29C70/42B32B37/153B32B2309/02B29B11/16B29K2033/08B29K2105/0002B29K2105/089C08J2333/12
Inventor S·里默斯Z·唐凯M·库比F·G·施密特
Owner EVONIK DEGUSSA GMBH
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