Papermaking shoe press belt
View Patent ↗A papermaking shoe press belt is formed of a reinforcing fiber base material and a polyurethane layer integrated with each other. The reinforcing fiber base material is embedded in the polyurethane layer. The papermaking shoe press belt includes, as the polyurethane layer, a polyurethane layer obtainable by curing a composition composed in combination of a urethane prepolymer and one or more curing agent. The urethane prepolymer is obtainable by reacting a p-phenylene diisocyanate compound with a long-chain polyol. The at least one curing agent is selected from 4,4′-methylene bis(2,6-diethyl-3-chloroaniline), 4,4′-methylene bis(2-chloroaniline), methylene bis(2-ethyl-6-methylaniline), 4,4′-methylene bis(2-ethylbenzeneamine), methylene bis(2,3-dichloroaniline), 4,4′-methylenedianiline, 3,5-dimethylthiotoluene-2,4-diamine, 3,5-dimethylthiotoluene-2,6-diamine, 3,5-diethyltoluene-2, 4-diamine, 3,5-diethyltoluene-2,6-diamine, polytetramethylene oxide di-p-aminobenzoate, poly(tetramethylene/3-methyl tetramethylene ether)glycol bis(4-aminobenzoate) , trimethylene bis(4-aminobenzoate) and isobutyl 4-chloro-3,5-diaminobenzoate.
1. A papermaking shoe press belt, comprising a reinforcing fiber base and a polyurethane layer that are integral with each other, the reinforcing fiber base being embedded in the polyurethane layer, wherein:
the polyurethane layer comprises a polyurethane obtained by curing a composition comprising a urethane prepolymer (A) and a curing agent (B) having active hydrogen groups (H);
the urethane prepolymer (A) comprises a terminal isocyanate group, and is obtained by reacting an isocyanate compound comprising 55 to 100 mol % of p-phenylene diisocyanate with polytetramethylene glycol;
the curing agent (B) comprises 65 to 100 mol % of at least one organic polyamine compound having the active hydrogen groups (H) selected from (B 1 ) and (B 2 ):
(B 1 ) 4,4′-methylenedianiline or a complex of 4,4′-methylenedianiline and sodium chloride; and
(B 2 ) 4,4′-methylene bis(2,6-diethyl-3-chloroaniline).
2. The papermaking shoe press belt according to claim 1 , wherein the papermaking shoe press belt has at least one of:
a tensile strain of 25.1% or less; and
a retention rate (%) of cross-sectional concave groove area of 90% or more.