Water absorbing and releasing body for engine oil, automotive parts including water absorbing and releasing body, and method for producing water absorbing and releasing body for engine oil

1. An oil filter comprising a water absorbing and releasing body for engine oil, the water absorbing and releasing body comprising:

a water-soluble organic macromolecule in an amount of from 0.1% by mass to 10% by mass, based on 100% by mass of the absorbing and discharging body;

a silicate in an amount of 0.1% by mass to 15% by mass, based on 100% by mass of the absorbing and discharging body;

a dispersant for the silicate in an amount of from 0.1% by mass to 10% by mass, based on 100% by mass of the absorbing and discharging body;

a water-absorbing macromolecule in an amount of from 0.01% by mass to 20% by mass, based on 100% by mass of the absorbing and discharging body; and

a reinforcing material;

wherein the water absorbing and releasing body has been adapted for absorbing water in engine oil and releasing water when the engine oil has a temperature of about 40° C. to about 120° C., and wherein

the water-soluble organic macromolecule is a fully neutralized or partially neutralized polyacrylate having a weight average molecular weight of 1,000,000 to 10,000,000,

the silicate is at least one of water-swellable silicate particles selected from the group consisting of smectite, bentonite, vermiculite, and mica,

the dispersant is at least one substance selected from the group consisting of a fully neutralized salt or partially neutralized salt of orthophosphoric acid, a fully neutralized salt or partially neutralized salt of pyrophosphoric acid, a fully neutralized salt or partially neutralized salt of tripolyphosphoric acid, a fully neutralized salt or partially neutralized salt of tetraphosphoric acid, a fully neutralized salt or partially neutralized salt of hexametaphosphoric acid, a fully neutralized salt or partially neutralized salt of polyphosphoric acid, a fully neutralized salt or partially neutralized salt of etidronic acid, sodium poly(meth)acrylate, ammonium poly(meth)acrylate, a sodium acrylate/sodium maleate copolymer, an ammonium acrylate/ammonium maleate copolymer, sodium hydroxide, hydroxylamine, sodium carbonate, sodium silicate, polyethylene glycol, polypropylene glycol, sodium humate, and sodium lignin,

the water-absorbing macromolecule is at least one substance selected from the group consisting of a crosslinking-type polyacrylate and a crosslinking-type polyvinylsulfonate, and

the reinforcing material is a fiber, and the fiber is a pulp wherein the pulp is obtained from a grinded oil filter.

2. The oil filter according to claim 1 , further comprising a water-soluble organic solvent.

3. The oil filter according to claim 2 , wherein the water-soluble organic solvent is a nonvolatile water-soluble organic solvent.

4. The oil filter according to claim 3 , wherein the nonvolatile water-soluble organic solvent is at least one solvent selected from the group consisting of glycerin, diglycerin, ethylene glycol, and 1,3-butylene glycol.

5. The oil filter according to claim 1 , wherein the water absorbing and releasing body for engine oil is a sheet-like form.

6. The oil filter according to claim 1 , wherein the water-absorbing macromolecule is a crosslinking-type polyacrylate having a grain diameter of 0.01 mm to 5 mm.

7. The oil filter according to claim 6 , wherein the grain diameter 0.1 mm to 1 mm.