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Papermaking shoe press belt

A shoe-shaped press, polyurethane layer technology, applied in the direction of papermaking, papermaking machines, press parts, etc., can solve the problem of not improving the shape retention characteristics of grooves

Active Publication Date: 2011-02-02
ICHIKAWA ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, the shoe press belts described in the above-mentioned Patent Documents 1 to 6 do not improve the shape retention characteristics of the grooves that affect the water squeezing performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0078] Next, in order to evaluate the physical properties of the polyurethane forming the shoe press belt, polyurethane test pieces were produced.

reference example 1

[0080]The urethane prepolymer obtained by reacting p-phenylene diisocyanate (PPDI) with polytetramethylene glycol (PTMG) (NCO% is 5.51%, the viscosity at 55°C is 1800cps, and the preheating temperature is 66°C) and containing 90 mol% of 4,4'-methylenebis(2,6-diethyl-3-chloroaniline) (Lonzacure M-CDEA) and 10 mol% of 3,5-diethyl A composition composed of toluene diamine (ETHACURE100) curing agent (H / NCO ratio of 0.95) is injected into the preheated mold, heated to 127°C, and cured at 127°C for 0.5 hours before being released from the mold It was taken out and post-cured at 127° C. for 16 hours to obtain a polyurethane sheet. A test piece (thickness: 1.0 mm) was produced using this piece.

reference example 2

[0082] The urethane prepolymer obtained by reacting p-phenylene diisocyanate (PPDI) with polytetramethylene glycol (PTMG) (NCO% is 5.51%, the viscosity at 55°C is 1800cps, and the preheating temperature is 66°C) and a curing agent containing 90 mol% of 4,4'-methylenebis(2-chloroaniline) (MOCA) and 10 mol% of 3,5-dimethylthiotoluenediamine (ETHACURE 300) The formed composition (H / NCO ratio is 0.95) is poured into a preheated mold, heated to 127°C, pre-cured at 127°C for 0.5 hours, taken out from the mold, and used at 127°C for 16 hours Post-curing was performed, whereby a polyurethane sheet was obtained. A test piece (thickness: 1.0 mm) was produced using this piece.

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PUM

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Abstract

The invention provides a shoe press belt with more excellent shape keeping feature of a groove. The papermaking shoe press belt is formed of a reinforcing fiber base material (6) and a polyurethane layer (2) integrated with each other and the reinforcing fiber base material is embedded in the polyurethane layer, characterized in that: the polyurethane layer is obtainable by curing a composition composed in combination of a urethane prepolymer and a curing agent and the urethane prepolymer is obtainable by reacting a p-phenylene diisocyanate compound with a long-chain polyol and the curing agent is selected from the special substances.

Description

technical field [0001] The present invention relates to a shoe press belt for papermaking (hereinafter, sometimes referred to as 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 relates to a shoe press belt having a resin layer made of polyurethane having a specific composition and having excellent properties such as groove shape retention properties. Background technique [0002] like image 3 As shown, in the shoe press device for papermaking, a shoe press mechanism in which an endless shoe press belt 2 is interposed between the press roll 1 and the shoe 5 is adopted, and formed by the press roll 1 and the shoe 5 In the press section, the paper transfer felt 3 and the wet paper 4 are passed through for dehydration. [0003] In addition, if figure 2 As shown, the shoe-shaped press belt 2 is provided with a polyurethane outer peripheral layer 21 and a polyurethane inner p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21F3/00
CPCD21F3/0236D21F3/0227Y10S162/901
Inventor 矢崎高雄山崎新太郎高森裕也
Owner ICHIKAWA ELECTRIC CO LTD