Fiber material for cement reinforcement

Patent metadata

Field	Value
Publication number	US-11535979-B2
Application number	US-202017023970-A
Country	US
Kind code	B2
Filing date	Sep 17, 2020
Priority date	Jan 19, 2015
Publication date	Dec 27, 2022
Grant date	Dec 27, 2022

Abstract

Provided is a fiber material for cement reinforcement, configured such that a resin A containing an isocyanate compound as a constituent component is present inside a fiber bundled body, and a resin B containing an epoxy resin as a constituent component is present on a surface of the fiber bundled body. Further, it is preferable that the resin A contains a polyol or an epoxy compound as a constituent component in addition to the isocyanate compound, the resin B contains an acrylic-modified epoxy resin or a bisphenol-A epoxy resin as a main component, the fiber bundled body has a tensile strength of 7 cN/dtex or more, and the fiber bundled body includes 50 to 3,000 single fibers. The invention is also addressed to a concrete or mortar molded article using the above fiber material for reinforcement.

First claim

What is claimed is:

1. A concrete or mortar formed body, characterized in that the formed body comprises a fiber material for cement reinforcement,
wherein the fiber material is organic fibers,
wherein a resin A containing a dimethylpyrazole-blocked isocyanate compound or a caprolactam-blocked isocyanate compound as a constituent component is present inside a fiber bundled body, and a resin B containing an epoxy resin as a constituent component is present on a surface of the fiber bundled body,
wherein the resin A contains a sorbitol polyglycidyl ether epoxy compound as a constituent component in addition to the isocyanate compound,
and the resin B contains a bisphenol-A epoxy resin as a main component; and
wherein the resin A is applied in an amount of 5.0 to 15.0 wt % relative to the total fiber weight, and the resin B is applied in an amount of 0.5 to 5.0 wt % relative to the total fiber weight.

2. The concrete or mortar formed body according to claim 1 ,
wherein the resin B contains an acrylic-modified bisphenol-A epoxy resin as a main component.

3. The concrete or mortar formed body according to claim 1 ,
wherein the fiber bundled body has a tensile strength of 7 cN/dtex or more.

4. The concrete or mortar formed body according to claim 1 ,
wherein the fiber bundled body includes 50 to 3,000 single fibers.

5. The concrete or mortar formed body according to claim 1 ,
wherein the resin A contains a polyol compound as a constituent component in addition to the isocyanate compound.

6. The concrete or mortar formed body according to claim 5 ,
wherein the resin B contains an acrylic-modified bisphenol-A epoxy resin as a main component.

7. The concrete or mortar formed body according to claim 1 ,
wherein the fiber bundled body has a tensile strength of 7 to 40 cN/dtex.

8. The concrete or mortar formed body according to claim 7 ,
wherein the fiber bundled body has a tensile strength of 7 to 21.0 cN/dtex.

9. The concrete or mortar formed body according to claim 8 ,
wherein the fiber bundled body has a tensile strength of 7 to 16.6 cN/dtex.

10. The concrete or mortar formed body according to claim 7 ,
wherein the fiber bundled body has a tensile strength of 10 to 40 cN/dtex.

11. The concrete or mortar formed body according to claim 10 ,
wherein the fiber bundled body has a tensile strength of 10 to 16.6 cN/dtex.

12. The concrete or mortar formed body according to claim 1 ,
wherein the fibers forming the fiber material are incorporated into the concrete or mortar formed body in an amount of 0.1 to 10.0 vol %,
wherein the amount is a fiber incorporation rate (V f : fiber volume fraction) expressed by the following equation:
V f =( V 1 /V 2 )×100

wherein V 1 represents the volume (liter) of the fibers for reinforcement incorporated per unit volume (1,000 l=1 m 3 ) of the fiber-containing cement formed body, and V 2 represents the unit volume (1,000 l=1 m 3 ) of the cement formed body.

13. The concrete or mortar formed body according to claim 9 , wherein the organic fibers are polyparaphenylene terephthalamide.

14. The concrete or mortar formed body according to claim 9 , wherein the organic fibers are copolyparaphenylene-3,4′-oxydiphenylene-terephthalamide.

15. The concrete or mortar formed body according to claim 1 ,
wherein the isocyanate compound is an isocyanate having an aliphatic hexamethylene diisocyanate (HDI) structure.

16. The concrete or mortar formed body according to claim 1 ,
wherein the isocyanate compound is dimethylpyrazole-blocked hexamethylene diisocyanate or caprolactam blocked diphenylmethane diisocyanate.

Assignees

• Teijin Ltd

Inventors

• Okamura Shuhei
• Shimada Shintaro
• Teraoka Akira
• Dei Takeya

Classifications

• C04B18/022

  agglomerated by an organic binder · CPC title

• C04B14/38

  Fibrous materials; Whiskers · CPC title

• D06M13/395

  Isocyanates · CPC title

• C04B28/02 Primary

  containing hydraulic cements other than calcium sulfates · CPC title

• C04B20/1037

  obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds · CPC title