US12428778B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12428778-B2 |
| Application number | US-202118014443-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jul 2, 2021 |
| Priority date | Jul 7, 2020 |
| Publication date | Sep 30, 2025 |
| Grant date | Sep 30, 2025 |
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A carbon fiber bundle having a high abrasion resistance property and simultaneously being excellent in widening property is provided by a carbon fiber bundle with an adhered sizing agent including a carbon fiber bundle, and a sizing agent adhered to a surface of the carbon fiber bundle, wherein the sizing agent contains an epoxy compound, and shows an intersection of a storage modulus and a loss modulus at an angular frequency in the range of 1×105 to 1×109 rad/sec in a measurement at 25° C.
Opening claim text (preview).
The invention claimed is: 1. A carbon fiber bundle with an adhered sizing agent comprising: a carbon fiber, and a sizing agent adhered to a surface of the carbon fiber, wherein the sizing agent contains an epoxy compound, and shows an intersection of a storage modulus and a loss modulus at an angular frequency in the range of 1×10 5 to 1×10 9 rad/sec in a measurement at 25° C. 2. The carbon fiber bundle with an adhered sizing agent according to claim 1 , wherein the sizing agent has Tan δ at 25° C. of 1 or more in an entire range of an angular frequency of 1 to 1×10 5 rad/sec. 3. The carbon fiber bundle with an adhered sizing agent according to claim 1 , wherein the sizing agent further contains a thermoplastic resin, and the thermoplastic resin has a complex viscosity at 25° C. 1 Hz of 100 Pa·s or more. 4. The carbon fiber bundle with an adhered sizing agent according to claim 1 , wherein the sizing agent further contains a polyoxyalkylene-based compound as an emulsifier. 5. The carbon fiber bundle with an adhered sizing agent according to claim 4 , wherein the content of the polyoxyalkylene-based compound in the sizing agent is 1 to 50% by weight per 100% by weight of a total weight of the epoxy compound and the polyoxyalkylene-based compound. 6. The carbon fiber bundle with an adhered sizing agent according to claim 2 , wherein the sizing agent further contains a thermoplastic resin, and the thermoplastic resin has a complex viscosity at 25° C. 1 Hz of 100 Pa·s or more. 7. The carbon fiber bundle with an adhered sizing agent according to claim 2 , wherein the sizing agent further contains a polyoxyalkylene-based compound as an emulsifier. 8. The carbon fiber bundle with an adhered sizing agent according to claim 3 , wherein the sizing agent further contains a polyoxyalkylene-based compound as an emulsifier. 9. The carbon fiber bundle with an adhered sizing agent according to claim 6 , wherein the sizing agent further contains a polyoxyalkylene-based compound as an emulsifier. 10. The carbon fiber bundle with an adhered sizing agent according to claim 7 , wherein the content of the polyoxyalkylene-based compound in the sizing agent is 1 to 50% by weight per 100% by weight of a total weight of the epoxy compound and the polyoxyalkylene-based compound. 11. The carbon fiber bundle with an adhered sizing agent according to claim 8 , wherein the content of the polyoxyalkylene-based compound in the sizing agent is 1 to 50% by weight per 100% by weight of a total weight of the epoxy compound and the polyoxyalkylene-based compound. 12. The carbon fiber bundle with an adhered sizing agent according to claim 9 , wherein the content of the polyoxyalkylene-based compound in the sizing agent is 1 to 50% by weight per 100% by weight of a total weight of the epoxy compound and the polyoxyalkylene-based compound.
Reduced friction resistance, lubricant properties; Sizing compositions · CPC title
Fibres of carbon · CPC title
Polyethers (polyacetals D06M15/39) · CPC title
Polyesters · CPC title
Epoxy resins · CPC title
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