阅读说明：本技术 交联橡胶组合物及其制造方法 (Crosslinked rubber composition and method for producing same ) 是由 大久保贵幸 升田贵文 于 2019-03-14 设计创作，主要内容包括：交联橡胶组合物中含有橡胶成分和分散在所述橡胶成分中的对位芳纶短纤维。在所述对位芳纶短纤维的表面,附着有RFL覆膜,所述RFL覆膜包括在分子内具有多个双键的(甲基)丙烯酸酯。(The crosslinked rubber composition contains a rubber component and a para-aramid short fiber dispersed in the rubber component. An RFL coating is attached to the surface of the para-aramid short fiber, and the RFL coating comprises (methyl) acrylate having a plurality of double bonds in the molecule.)

1. A crosslinked rubber composition comprising a rubber component and a para-aramid short fiber dispersed in the rubber component, characterized in that:

an RFL coating is attached to the surface of the para-aramid short fiber, and the RFL coating comprises (methyl) acrylate with a plurality of double bonds in molecules.

2. The crosslinked rubber composition according to claim 1, characterized in that:

the para-aramid staple fibers include poly (p-phenylene terephthalamide) staple fibers.

3. The crosslinked rubber composition according to claim 1 or 2, characterized in that:

the content of the para-aramid short fiber is 1 to 35 parts by mass with respect to 100 parts by mass of the rubber component.

4. The crosslinked rubber composition according to any one of claims 1 to 3, characterized in that:

the filament fineness of the para-aramid short fiber is more than 1.5dtex and less than 5.0 dtex.

5. The crosslinked rubber composition according to any one of claims 1 to 4, characterized in that:

the length of the para-aramid short fiber is more than 0.5mm and less than 10 mm.

6. The crosslinked rubber composition according to any one of claims 1 to 5, characterized in that:

The (meth) acrylate having a plurality of double bonds in the molecule includes polyethylene glycol dimethacrylate.

7. The crosslinked rubber composition according to claim 6, characterized in that:

the polymerization degree of the ethylene glycol monomer in the polyethylene glycol dimethacrylate is below 20.

8. The crosslinked rubber composition according to any one of claims 1 to 7, characterized in that:

the content of the (meth) acrylate having a plurality of double bonds in the molecule in the RFL coating is 2 to 20 parts by mass with respect to 100 parts by mass of the latex-derived solid content of the RFL coating.

9. The crosslinked rubber composition according to any one of claims 1 to 8, characterized in that:

the rubber component includes an ethylene-alpha-olefin elastomer.

10. The crosslinked rubber composition according to any one of claims 1 to 9, characterized in that:

the rubber component is obtained by crosslinking using an organic peroxide as a crosslinking agent.

11. A method for producing a crosslinked rubber composition, which comprises a step of kneading a rubber component and a para-aramid short fiber, characterized in that:

The para-aramid short fiber is prepared before the kneading by dipping a yarn of the para-aramid fiber in an RFL aqueous solution containing a (meth) acrylate having a plurality of double bonds in the molecule, then heating the yarn, and then cutting the yarn into a predetermined fiber length.

Technical Field

The present invention relates to a crosslinked rubber composition and a method for producing the same.

Background

Among various rubber products, a crosslinked rubber composition containing a para-aramid short fiber is generally used. For example, patent document 1 discloses a transmission belt using a rubber composition containing a para-aramid short fiber. Patent document 2 discloses a tire using a rubber composition containing a para-aramid short fiber. Patent document 3 discloses a hose using a rubber composition containing a para-aramid short fiber.

Patent document 1: japanese laid-open patent publication No. 2013-108564

Patent document 2: japanese laid-open patent publication No. 2013-18893

Patent document 3: japanese laid-open patent publication No. 2005-200545

Disclosure of Invention

Technical solution for solving technical problem

The present invention is a crosslinked rubber composition containing a rubber component and a para-aramid short fiber dispersed in the rubber component, wherein an RFL coating is attached to the surface of the para-aramid short fiber, and the RFL coating contains a (meth) acrylate having a plurality of double bonds in the molecule.

The present invention is a method for producing a crosslinked rubber composition, comprising a step of kneading a rubber component and a para-aramid short fiber, wherein, before the kneading, a para-aramid fiber yarn is immersed in an RFL aqueous solution containing a (meth) acrylate having a plurality of double bonds in the molecule, then heated again, and then cut into a predetermined fiber length, thereby preparing the para-aramid short fiber before the kneading.

Drawings

FIG. 1 is a graph showing the relationship between the content of poly (p-phenylene terephthalamide) short fibers (PPTA short fibers) and the Young's modulus of storage;

figure 2 is a graph showing the relationship between the content of poly (p-phenylene terephthalamide) staple fibers (PPTA staple fibers) and the mooney viscosity.

Detailed Description

The following describes embodiments in detail.