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Shoe press belt for papermaking

A shoe-shaped press, polyurethane layer technology, applied in the direction of paper making, paper machine, pressing part, etc., can solve the problem of harsh use environment of shoe-shaped press belts

Active Publication Date: 2011-01-05
ICHIKAWA ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, in recent years, the use environment of shoe press belts has become very severe due to the increase in operating speed due to the improvement of paper productivity, the expansion of the width of shoe press belts to about 10m, and the increase in pressure in the press section. , so it is required to further improve the above-mentioned various characteristics

Method used

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  • Shoe press belt for papermaking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0054] Hereinafter, in order to evaluate the physical properties of the polyurethane forming the shoe press belt, a polyurethane test piece was produced.

reference example 1

[0056] Urethane prepolymer obtained by reacting p-phenylene diisocyanate (PPDI) with polytetramethylene glycol (PTMG) (NCO% is 5.51%, viscosity at 55°C is 1,800cps, preheating temperature Is 66°C), and a curing agent mixture composed of 97 mol% of 1,4-butanediol (1,4-BD) and 3 mol% of trimethylolpropane (TMP) (H / NCO equivalent ratio 0.95), the mixture was poured into a mold preheated to 127°C, heated to 127°C, the upper mold was removed from the mold after 0.5 hours of pre-curing at this temperature, and 16 hours at 127°C Post-curing was performed to obtain a cured polyurethane sheet having a JIS A hardness of 98.1 degrees. Using this sheet, a test piece (thickness: 3.4 mm) was produced.

reference example 2

[0058] The urethane prepolymer obtained by reacting 4,4'-methylene bis(phenyl isocyanate) (MDI) and polytetramethylene glycol (PTMG) (NCO% is 8.85%, at 100°C) The viscosity is 400cps, the preheating temperature is 80℃), and the curing is composed of 97 mol% of 1,4-butanediol (1,4-BD) and 3 mol% of trimethylolpropane (TMP) The agent mixture is mixed (H / NCO equivalent ratio is 0.90), the mixture is poured into a mold preheated to 115°C, heated to 115°C, and the upper mold is removed from the mold after curing at this temperature for 1 hour Further, post-curing was performed at 115°C for 16 hours to obtain a cured polyurethane sheet having a JIS A hardness of 92.2 degrees. Using this sheet, a test piece (thickness: 3.4 mm) was produced.

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Abstract

A belt for papermaking shoe presses is provided which comprises a reinforcing fibrous base (6) and a polyurethane layer (2) united therewith, the reinforcing fibrous base (6) having been embedded in the polyurethane layer (2). The belt includes a polyurethane layer obtained by curing a mixture comprising: a urethane prepolymer obtained by reacting a polyisocyanate compound selected among p-phenylene diisocyanate, 4,4'-methylenebis(phenyl isocyanate), and tolylene diisocyanate with a polyol compound selected among polypropylene glycol, polytetramethylene glycol, and a polycarbonate diol; a hardener selected among an aliphatic diol compound, hydroquinone bis-ss-hydroxyethyl ether, and organic polyamine compound; and an aliphatic triol compound. Due to this layer, the shoe press belt for papermaking is excellent in wearing resistance and flexing fatigue resistance.

Description

Technical field [0001] The present invention relates to a shoe press belt used in a shoe press for papermaking, and more particularly to a shoe press belt used in a closed shoe press. More specifically, it is a shoe press belt for papermaking that has a resin layer formed of a polyurethane of a specific composition and has excellent mechanical properties such as abrasion resistance, crack resistance, and bending fatigue resistance. Background technique [0002] Such as image 3 As shown, in the shoe press process, a shoe press mechanism in which an annular shoe press belt 2 is inserted between the press roll 1 and the shoe 5 is used, and the shoe press mechanism is formed by the press roll 1 and the shoe 5. In the press section, the threading felt 3 and the wet paper 4 are passed through to perform dehydration. [0003] In addition, such as figure 2 As shown, the shoe press belt 2 is provided with a polyurethane outer peripheral layer 21 and a polyurethane inner peripheral layer 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21F7/08C08G18/10C08G18/32C08J5/04D21F3/00
CPCC08G18/4854C08J2375/04D21F3/0227C08J5/046C08G18/10C08J5/24C08G18/44Y10S162/901C08J5/246C08J5/249C08G18/3215C08G18/3857C08G18/324C08G18/3206
Inventor 矢崎高雄铃木伸治山崎新太郎石野淳高森裕也梅原亮田村蓝
Owner ICHIKAWA ELECTRIC CO LTD
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