Surfaces containing coupling activator compounds and reinforced composites produced therefrom

a technology of activator compounds and surface, which is applied in the direction of weaving, transportation and packaging, ceramic layered products, etc., can solve the problems of high glass loading of glass-reinforced polyamide composites, and achieve the effects of improving interfacial adhesion, tougher composite materials, and improving the coupling between glass and polymer

Inactive Publication Date: 2010-11-11
JOHNS MANVILLE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011]Blocked precursors of coupling activator compounds may include isocyanates blocked with compounds other than the activator compound. Under the processing conditions, such blocked isocyanate would become unblocked to furnish free isocyanate. The isocyanate may, under the reaction conditions, become blocked with the monomer thus forming the polymerisation activator. The silane functionality of the isocyanate compound may react with the substrate, such as glass, thus leading to improved interfacial adhesion.
[0012]In another embodiment, the invention provides a process for preparing a reinforced resin material, e.g. a glass-reinforced resin polyamide. A sizing composition comprising a coupling activator compound of formula I above may be applied to a glass substrate. In one embodiment, the sized glass substra

Problems solved by technology

There is a need to provide glass-reinforced polyamide composites with high glass loading; how

Method used

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  • Surfaces containing coupling activator compounds and reinforced composites produced therefrom
  • Surfaces containing coupling activator compounds and reinforced composites produced therefrom
  • Surfaces containing coupling activator compounds and reinforced composites produced therefrom

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0037]Chopped fibre strands sized with a sizing composition comprising 2-oxo-N-(3-(triethoxysilyl)propyl)azepane-1-carboxamide (compound 3 in reaction scheme A above) may be fed into an extruder as previously described. A monomer mix comprising caprolactam monomer 1 and sodium caprolactam catalyst 4, as shown in reaction scheme B above, may also be fed into the extruder to be mixed and heated with the sized glass fibres. The processing conditions within the extruder initiate and complete an anionic ring-opening polymerization of caprolactam 1 in accordance with reaction scheme B, and strands of the resulting glass-reinforced Nylon-6 may be extruded through the extruder die. A sample strand of the glass-reinforced Nylon-6 may be broken under tension. The breaking point may be analyzed with a Scanning Electron Microscope (SEM) to show the outstanding coupling of glass and polymer in the composite material provided by the present invention.

example 2

[0038]Chopped glass fibres strands may be sized with a conventional sizing composition comprising 0-30 wt % of γ-aminopropyltriethoxysilane or other suitable silane coupling agent, 20-70 wt % of a polyurethane emulsion or a suitable mixture of emulsions, and 10-50 wt % of a lubricant or mixture of lubricants, and 0-50 wt % of any other required or preferred additives. The chopped sized fibres may be fed into the same extruder used in Example 1 above. Referring to reaction scheme E below, monomer mix comprising caprolactam monomer 1, sodium caprolactam catalyst 4 and a commercially-available activator 5 may also be fed into the extruder, thereby mixing and heating the mix with the sized glass fibres. The processing conditions within the extruder initiate and complete an anionic ring-opening polymerization of the caprolactam monomer 1 within the extruder in accordance with reaction scheme E below:

[0039]Strands of the resulting Nylon-6 may then be obtained from the extruder die and ana...

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Abstract

The invention relates to products and processes employing coupling activator compounds represented by the following formula I:
S—X-A  (I)
wherein S represents a silane coupling moiety capable of bonding with the surface of an inorganic substrate, A represents a ring-opening polymerization activator moiety, or blocked precursor thereof, and X represents a linking moiety. Substrates containing the coupling activator compounds are useful in preparing reinforced resins.

Description

BACKGROUND OF THE INVENTION[0001]It is well-known to employ inorganic materials in composite articles to strengthen and reinforce the articles. In addition to increased dimensional stability, addition of the inorganic material provides polymer composites with significantly improved physical and mechanical properties. As one example, glass fibres may be placed into a polymer matrix where the high tensile strength of glass causes the composite to become more rigid. The glass fibres incorporated in the polymer matrix may take various forms: continuous or chopped strands, rovings, woven or non-woven fabrics, continuous or chopped strand mats, etc.[0002]Conventionally, glass fibres are formed by attenuating streams of a molten glass material from a bushing or orifice. The glass fibres may be attenuated by pulling by a winder, which collects filaments into a package or by other equipment or method capable of pulling the fibres. A sizing composition, or chemical treatment, is typically app...

Claims

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Application Information

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IPC IPC(8): C08L77/04B32B9/04B32B17/02B32B5/02B29C47/02B29C39/10C08G63/08C08G69/14C08F210/00C08G18/00B05D3/10B29C48/04
CPCB29C47/0004Y10T428/30B29K2105/06B29K2301/10C08G18/718C08G18/8074C08J5/08C08J5/24C08J2365/00C08J2367/04C08J2375/04C08J2377/02C08L75/04C08L77/02B29C47/0011B29C48/022B29C48/04Y10T428/31663Y10T428/31612Y10T442/20Y10T428/31504C08J5/04
Inventor BURGHARDT, THOMASASRAR, JAWEDGLEICH, KLAUS FRIEDRICH
Owner JOHNS MANVILLE CORP
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