A crushing part or component of a gyratory grinder or other crushing, grinding or material-reducing machine is provided with a shock-absorbing backing material (3) which has improved flow properties at low ambient temperatures and is formed of a filled polyurethane resin composition derived from a cold-curing liquid system formed by mixing together (a) a liquid material comprising the polyol component and at least part of the filler in the composition and wherein the polyol component comprises (i) one or more polyether polyols each having at least two hydroxyl groups per molecule, the average number of hydroxyl groups per molecule being more than 2 but not more than 3.3, (ii) one or more polyols each having at least two hydroxyl groups per molecule and containing both ether and ester groups, the average number of hydroxyl groups per molecule being more than 2 but not more than 3.3, and (iii) at least one ester of a long chain hydroxylated fatty acid having at least 10 carbon atoms (including the carboxylic carbon atom); (i) and (ii) being present in amounts such that (i) provides from 1.5 to 3.5 hydroxy groups for each hydroxy group provided by (ii), and (iii) being present in an amount of 2 to 10% by weight of said liquid material, and (b) at least one aromatic polyisocyanate in an amount such that there is an excess of isocyanate groups over hydroxyl groups in the cold-curing system, and said liquid material also includes a quaternary ammonium smectite, as defined, in an amount of from 0.2% to 2% by weight of the liquid material.
一种回转式粉碎机或其他粉碎机、研磨机或减料机的粉碎部件或组件具有减震背衬材料 (3),该背衬材料在低环境温度下具有更好的流动性能,由填充聚
氨酯
树脂组合物形成,该组合物由冷固化液体体系衍生而来,冷固化液体体系是将 (a) 一种液体材料混合在一起形成的,该液体材料包括多元醇组分和组合物中至少一部分填料,其中多元醇组分包括 (i) 一种或多种聚醚多元醇,每种多元醇每个分子至少有两个羟基、每个分子的羟基平均数目多于 2 个但不多于 3 个。3,(ii)一种或多种多元醇,每种多元醇每分子至少有两个羟基,并含有醚基和酯基,每分子羟基的平均数目大于2但不大于3.3,以及(iii)至少一种长链羟化
脂肪酸酯,该
脂肪酸至少有10个碳原子(包括羧基碳原子);(i)和(ii)的存在量使得(i)每一个羟基提供1.5至3.(b) 至少一种芳香族多
异氰酸酯,其用量应使冷固化体系中的
异氰酸酯基团超过羟基基团,且所述液体材料还包括一种季
铵盐,如所定义,其用量为液体材料重量的 0.2% 至 2%。