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Hybrid polymers made of cyanates and silazanes, method for the production and use thereof

A cyanate ester and silazane technology, applied in the field of hybrid prepolymers and hybrid polymers, can solve problems such as lack of fire resistance, achieve low hardening temperature, improve flame retardancy, and high inherent flame retardancy Effect

Inactive Publication Date: 2012-05-09
FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, epoxy resin and bismaleimide resin are mainly used as RTM resin, but neither of them has satisfactory fire resistance

Method used

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  • Hybrid polymers made of cyanates and silazanes, method for the production and use thereof
  • Hybrid polymers made of cyanates and silazanes, method for the production and use thereof
  • Hybrid polymers made of cyanates and silazanes, method for the production and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-

[0118] Example 1 - Preparation of polymer from 4,4'-methylmethylene-diphenyl dicyanate (L10) and hexamethylcyclotrisilazane (HMCTS)

[0119] 4,4'-Methylmethylene-diphenyl dicyanate (L10) was mixed with Hexamethylcyclotrisilazane (HMCTS) mixed.

[0120] This mixture was poured into a flat casting mold and heated to 70°C. After about 2 hours, the temperature was increased to 200° C., and after a further 2 hours to 250° C., and kept at this temperature for 1 hour to post-harden the prepolymer formed. After a total of 6.5 hours, the temperature was slowly lowered to room temperature. A slightly yellowish-brown translucent plate with a dry surface was obtained.

Embodiment 2-

[0121] Example 2 - Preparation of polymer from 4,4'-methylmethylene-diphenyl dicyanate (L10) and trimethyltrivinylcyclotrisilazane (TMTVCTS)

[0122] The dicyanate is mixed with the silazane in an equivalent ratio of about 7:3 to about 9:1 at room temperature (at which temperature it is liquid) without solvent.

[0123] At an equivalence ratio of 7:3, heat to 70° C. and keep at this temperature for about 2 hours. It was then heated to 200° C. and kept at this temperature for 1 hour. After a total of 6.5 hours, the temperature was slowly lowered to room temperature. A slightly yellowish-brown translucent plate is obtained. Its glass transition temperature is about 80°C.

[0124] In another hardening embodiment, the mixture (equivalent ratio 7:3 to 9:1) is likewise poured into a flat casting mold and heated to 70°C. After about 2 hours, the temperature was increased to 200° C., and after a further 2 hours to 250° C., and kept at this temperature for 1 hour to post-harden the...

Embodiment 3a and 3b

[0140] 4,4′-Methylmethylene-diphenyl dicyanate (L10) was mixed with vinyl in an equivalent ratio of 8:2 at room temperature (at which it was liquid) without solvent - Methyl-polysilazane (VL100) (Example 3a) or a cyclic silazane (VML50) obtained from 50 mol % of dichlorovinylmethylsilane and 50 mol % of dichlorodimethylsilane (Example 3a) 3b) Mixing. These mixtures were all fed into the mold here and hardened according to embodiment 1 of example 2 (equivalent ratio 1:1) at a maximum hardening temperature of 200° C. The glass transition temperature T of the final hardened polymer from Example 3b was measured g It is 185°C; Example 3a is slightly higher.

[0141] figure 1 Shown are the exotherms of the reactions according to examples 3a (curve A) and 3b (curve 3b). -ΔH(J / g -1 ) has a numerical value of 450 or 480.

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Abstract

The invention relates to hybrid pre-polymers and polymers produced by converting difunctional, oligofunctional and / or polyfunctional cyanates and / or pre-polymers thereof with monomer, oligomer and / or polymer silazanes. The polymers are duromers having high glass transition temperature and very high fracture toughness from the respective cyanate output materials. They can be dissolved in a pre-polymerized state in solvents and are therefore suitable as impregnating resins for prepregs, for example. In addition, they can be processed to moulded articles. The fire characteristics thereof are particularly exceptional.

Description

technical field [0001] The present invention relates to hybrid prepolymers prepared by reaction of difunctional, oligofunctional and / or polyfunctional cyanate esters and / or prepolymers thereof with monomeric, oligomeric and / or polymeric silazanes and hybrid polymers. The polymer is a thermoset with a high glass transition temperature, which has very high fracture toughness compared to thermosets made from a single cyanate starting material. In the prepolymerized state they are soluble in solvents and are therefore suitable, for example, as impregnating resin for prepreg tapes. Furthermore, it can also be processed into shaped bodies. Particularly outstanding are its combustion properties. Background technique [0002] For the production of shaped bodies, for example from casting resins, coated surface formers, adhesives, adhesion assistants, etc., there is an increasing demand for lightweight plastic materials which are flame-retardant or have a flame-retardant effect, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/54C08L83/14
CPCC08L83/14C08G77/54Y10T428/249921C08G18/61C08J5/24C08G77/62C08L83/16B32B17/02
Inventor M·鲍尔D·德克尔F·里希特M·格维阿茨达
Owner FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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