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Shoe press belt
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A shoe press, polyurethane technology, applied in the press section, textiles and papermaking, paper machines, etc., can solve the problem of harsh use environment for shoe press belts, and achieve excellent mechanical properties, durability, and wear resistance. sexual effect
Active Publication Date: 2011-11-16
ICHIKAWA ELECTRIC CO LTD
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[0033] However, in recent years, the use environment of shoe press belts has changed due to the increase in operating speed due to the increase in paper productivity, the expansion of the width of shoe press belts to about 10 m, and the increase in pressure in the press section. very harsh
Method used
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[0137] Next, in order to evaluate the physical properties of the polyurethane forming the belt 10 for a shoe press, a case where a polyurethane test piece is produced will be described.
reference example 1
[0139] A urethane prepolymer is obtained by reacting p-phenylene diisocyanate (PPDI) with polytetramethylene glycol (PTMG). A curing agent mixture was obtained using 97 mole % of 1,4-butanediol (1,4BD) and 3 mole % of 3,5-diethyltoluenediamine (ETHACURE 100).
[0140] Then, a urethane prepolymer (NCO% 5.51%, viscosity 1800 cps at 55°C, preheating temperature 66°C) and a curing agent mixture were mixed. The H / NCO equivalent ratio at this time was 0.95. In addition, this polyurethane resin mixture is simply expressed as "PPDI / PTMG / 1,4BD+ETHACURE100:H / NCO=0.95".
[0141] The mixture thus obtained was poured into a mold preheated to 127°C, the mold was heated up to 127°C, and pre-cured at 127°C for 30 minutes. Then, the upper mold was removed from the mold, and the mixture was further post-cured at 127° C. for 16 hours. Thus, a cured polyurethane sheet having a "JIS A hardness" of 98.1 degrees was obtained. A test piece (thickness: 1.5 mm) was produced from this sheet.
reference example 2
[0143] A urethane prepolymer is obtained by reacting p-phenylene diisocyanate (PPDI) with polytetramethylene glycol (PTMG). A curing agent mixture was obtained using 95 mole % of 1,4-butanediol (1,4BD) and 5 mole % of 3,5-dimethylthiotoluenediamine (ETHACURE 300).
[0144] Then, a urethane prepolymer (NCO% 5.51%, viscosity 1800 cps at 55°C, preheating temperature 66°C) and a curing agent mixture were mixed. The H / NCO equivalent ratio at this time was 0.95.
[0145] The mixture thus obtained was poured into a mold preheated to 127°C, the mold was heated to 127°C, and pre-cured at 127°C for 30 minutes. Then, the upper mold was removed from the mold, and the mixture was further post-cured at 127° C. for 16 hours. Thus, a cured polyurethane sheet having a "JIS A hardness" of 98.2 degrees was obtained. A test piece (thickness: 1.5 mm) was produced from this sheet.
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Abstract
Disclosed is a shoe press belt (10) which comprises a reinforcing fibrous base material (6) embedded in a polyurethane layer, and has an outer circumference layer (2a) and an inner circumference layer (2b) each formed with a polyurethane. The polyurethane layer constituting the outer circumference layer (2a) comprises a polyurethane which is cured by the reaction of an urethane prepolymer (A) with a curing agent mixture (B). The urethane prepolymer (A) is produced by reacting an isocyanate compound selected from p-phenylene-diisocyanate and 4,4'-methylenebis(phenylisocyanate) with a polytetramethylene glycol and has an isocyanate group at its terminal. The curing agent mixture (B) comprises 1,4-butanediol and an aromatic polyamine having an active hydrogen group (H). The shoe press belt has excellent wear resistance, cracking resistance and bending fatigue resistance.
Description
technical field [0001] The present invention relates to a belt for a shoe press used in a shoe press for papermaking, and more particularly to a belt for a shoe press used in a closed type shoe press. More specifically, the belt has a resin layer made of polyurethane having a specific composition, and is a shoe press belt excellent in mechanical properties such as wear resistance, crack resistance, and bending fatigue resistance. Background technique [0002] Figure 4 is a cross-sectional view of a shoe press belt, Figure 5 It is a sectional view of the wet paper dehydrator. [0003] like Figure 5 As shown, in the shoe press process, a shoe press mechanism is employed in which an endless shoe press belt 2 is interposed between a press roll 1 and a shoe 5 . In this mechanism, a transfer felt 3 and a wet paper 4 are passed through a press section formed by a press roll 1 and a shoe 5 to perform dehydration. [0004] like Figure 4 As shown, the shoe press belt 2 is prov...
Claims
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