硅烷在玻璃纖維與復(fù)合材料中的應(yīng)用

1、A Guide to Silane SolutionsFiberglass and Compositesdissolve in the bath at low con-centrations and give the stability needed to treat the fiberglass. Certain silanes, such as aminosi-lanes, are more hydrophilic and will dissolve at high concentrations in water even without pH adjustment. The size i

2、s applied to the fiberglass at the glass fiber manufacturing plant immediately after the glass fibers are extruded and bundled into glass fiber rovings.Depositing the silane as a silse-quioxane (organosilicon with three oxygen atoms shared with other silicon atoms on a surface and measuring the weig

3、ht loss by thermal gravimetric analysis (TGA can determine the thermal stability of the silane. Results of isothermal TGA at 300ºC (572ºF for several silanes are shown in Figure 1.The improvement in thermal stability of a fiberglass-polyimide composite is shown in Table 1.Some of the benef

4、its imparted to fiberglass-reinforced plastics by XIAMETER® silanes include: Improved mechanical strengthof the composites Improved electrical properties Improved resistance tomoisture attack at the interface Improved wet-out of theglass fiber Improved fiber strand integrity,protection, and han

5、dling Improved resistance to hotsolder during fabrication Improved performance incycling tests from hot to coldextremesTable 2 suggests silanes for evaluation with various fiberglass-reinforced polymer systems.Fiberglass and CompositesSilane coupling agents are a critical component of fiberglass-rei

6、nforced polymers. The glass is veryhydro-philic and attracts water to the interface. Without silane treatment on the surface, the bond between the glass fiber and the resin would weaken and eventually fail. Silane coupling agents are used on fiberglass for general-pur-pose reinforced plastic applica

7、tions, such as automotive, marine, sporting goods and building construction, as well as for high-performance applications in printed circuit boards and aerospace composites. XIAMETER® brand silanes figure prominently in the trend toward increasingly more durable, higher-strength plastic composi

8、tes.The chemical structure of the organic group in a silane coupling agent has a great effect on its performancein a composite, as measured by improvement of strength proper-ties under wet and dry conditions.A wet-aging test, usually in boilingwater, will show differences in the effectiveness of var

9、ious silanes.Fiberglass for general-purpose applications is treated with a dilute aqueous sizing bath consisting of a combination of ingredients (organic film formers, lubricants, antistats and a silane coupling agent. The silane must be soluble in the aqueous bath at levels of 0.2 to 1 percent. Nor

10、mally, if a water bath is acidified with acetic acid to a pH of 4, even hydrophobic silanes will Figure 1. Thermal stability of silanes at 300ºC (572ºF, TGA. Stability of RSiO3/2in AirHours at 300°C (572°F%RRemainingProduct Information A complete list of XIAMETER ® brand sil

11、anes for use as fiberglass and composite applications is available at .In addition, Dow Corning Corporation also offers a wide variety of Dow Corning ® brand specialty silicone material and service options as well as other silicon-based materials available to help you keep your innovative edge

12、in the marketplace. Visit to learn more about the many additional silicone and silicon-based options available to you from Dow Corning.Table 1. Thermal Stability of Mixed Silanes Phenyl + Amino,S-Glass/Polyimide LaminatesXIAMETER ®brand silane:A: OFS-6124 Ph-Si(OCH 33B: OFS-6011 H 2N(CH 23Si(OC

13、H 2CH 3C: OFS-6020 H 2N(CH 23NH(CH 22Si(OCH 33Table 2. Silane Coupling Agent Recommendations for VariousPolymers Matching Organoreactivity to Polymer TypeLIMITED WARRANTY INFORMATION PLEASE READ CAREFULLYThe information contained herein is offered in good faith and is believed to be accurate. Howeve

14、r, because conditions and methods of use of our products are beyond our control, this information should not be used in substitution for customers tests to ensure that our products are safe, effective and fully satisfactory for the intended end use. Suggestions of use shall not be taken as inducemen

15、ts to infringe any patent.Dow Cornings sole warranty is that our products will meet the sales specifications in effect at the time of shipment.Your exclusive remedy for breach of such warranty is limited to refund of purchase price or replacement of any product shown to be other than as warranted.DOW CORNING SPECIFICALLY DISCLAIMS ANY OTHER EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE OR MERCHANTABILITY. DOW CORNING DISCLAIMS LIABILITY FOR ANY INCIDENTAL OR