| 摘要 |
PURPOSE:To raise the impact resistance and wear resistance of a patterned manhole cover by a method in which a nonsolvent-type chlorinated polyethylene- epoxy paste composed of specific components is packed into the recessed portion of the cover and hardened. CONSTITUTION:The 90-97wt.% mixture of a glycidyl compound of 300 or less molecular weight and liquid epoxy resin of 300-800 molecular weight is mixed with 10-3wt.% rubbery chlorinated polyethylene containing 25-50wt.% chlorine which is prepared by chlorinating a copolymer composed of polyethylene of a molecular weight of 10,000-100,000 or ethylene and another monomer, together with 0.1-20pts.wt. pigment and epoxy resin hardener on the basis of 100wt.% the mixture, to form a polyethylene-epoxy resin paste. The paste is cast into the recessed portions of the manhole cover and hardened by heating or at ordinary temperature to bond it to the cover. The impact resistance and wear resistance of the cover can thus be raised.
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