US20130192787A1 - Paper making shoe press belt - Google Patents
Paper making shoe press belt Download PDFInfo
- Publication number
- US20130192787A1 US20130192787A1 US13/541,907 US201213541907A US2013192787A1 US 20130192787 A1 US20130192787 A1 US 20130192787A1 US 201213541907 A US201213541907 A US 201213541907A US 2013192787 A1 US2013192787 A1 US 2013192787A1
- Authority
- US
- United States
- Prior art keywords
- shoe press
- curing agent
- press belt
- paper making
- polyurethane
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 229920002635 polyurethane Polymers 0.000 claims abstract description 133
- 239000004814 polyurethane Substances 0.000 claims abstract description 133
- 238000001723 curing Methods 0.000 claims abstract description 74
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 70
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000012783 reinforcing fiber Substances 0.000 claims abstract description 34
- 239000000758 substrate Substances 0.000 claims abstract description 34
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 claims abstract description 33
- -1 diisocyanate compound Chemical class 0.000 claims abstract description 23
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 claims abstract description 17
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 claims abstract description 16
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 claims abstract description 15
- ALQLPWJFHRMHIU-UHFFFAOYSA-N 1,4-diisocyanatobenzene Chemical compound O=C=NC1=CC=C(N=C=O)C=C1 ALQLPWJFHRMHIU-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229920005862 polyol Polymers 0.000 claims abstract description 12
- AOFIWCXMXPVSAZ-UHFFFAOYSA-N 4-methyl-2,6-bis(methylsulfanyl)benzene-1,3-diamine Chemical compound CSC1=CC(C)=C(N)C(SC)=C1N AOFIWCXMXPVSAZ-UHFFFAOYSA-N 0.000 claims abstract description 11
- 150000003077 polyols Chemical class 0.000 claims abstract description 11
- 238000013007 heat curing Methods 0.000 claims abstract description 10
- YBRVSVVVWCFQMG-UHFFFAOYSA-N 4,4'-diaminodiphenylmethane Chemical compound C1=CC(N)=CC=C1CC1=CC=C(N)C=C1 YBRVSVVVWCFQMG-UHFFFAOYSA-N 0.000 claims abstract description 8
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims abstract description 8
- VIOMIGLBMQVNLY-UHFFFAOYSA-N 4-[(4-amino-2-chloro-3,5-diethylphenyl)methyl]-3-chloro-2,6-diethylaniline Chemical compound CCC1=C(N)C(CC)=CC(CC=2C(=C(CC)C(N)=C(CC)C=2)Cl)=C1Cl VIOMIGLBMQVNLY-UHFFFAOYSA-N 0.000 claims abstract description 7
- 230000002093 peripheral effect Effects 0.000 claims description 74
- 238000012360 testing method Methods 0.000 description 27
- 239000000203 mixture Substances 0.000 description 25
- 230000000052 comparative effect Effects 0.000 description 19
- IBOFVQJTBBUKMU-UHFFFAOYSA-N 4,4'-methylene-bis-(2-chloroaniline) Chemical compound C1=C(Cl)C(N)=CC=C1CC1=CC=C(N)C(Cl)=C1 IBOFVQJTBBUKMU-UHFFFAOYSA-N 0.000 description 18
- 241001112258 Moca Species 0.000 description 12
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 10
- 239000000835 fiber Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 6
- 229920000139 polyethylene terephthalate Polymers 0.000 description 6
- 239000005020 polyethylene terephthalate Substances 0.000 description 6
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 241000063973 Mattia Species 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 238000009661 fatigue test Methods 0.000 description 3
- 239000006082 mold release agent Substances 0.000 description 3
- 238000011417 postcuring Methods 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011265 semifinished product Substances 0.000 description 3
- 239000004970 Chain extender Substances 0.000 description 2
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- ZFMQKOWCDKKBIF-UHFFFAOYSA-N bis(3,5-difluorophenyl)phosphane Chemical compound FC1=CC(F)=CC(PC=2C=C(F)C=C(F)C=2)=C1 ZFMQKOWCDKKBIF-UHFFFAOYSA-N 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000012948 isocyanate Substances 0.000 description 2
- 150000002513 isocyanates Chemical class 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 229920000909 polytetrahydrofuran Polymers 0.000 description 2
- 229920003225 polyurethane elastomer Polymers 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000001988 toxicity Effects 0.000 description 2
- 231100000419 toxicity Toxicity 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- RTTZISZSHSCFRH-UHFFFAOYSA-N 1,3-bis(isocyanatomethyl)benzene Chemical compound O=C=NCC1=CC=CC(CN=C=O)=C1 RTTZISZSHSCFRH-UHFFFAOYSA-N 0.000 description 1
- AEYNYHSOGNVQRY-UHFFFAOYSA-N 1-n,1-n-diethyl-4-methylbenzene-1,3-diamine Chemical compound CCN(CC)C1=CC=C(C)C(N)=C1 AEYNYHSOGNVQRY-UHFFFAOYSA-N 0.000 description 1
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
- 229920002292 Nylon 6 Polymers 0.000 description 1
- 229920000305 Nylon 6,10 Polymers 0.000 description 1
- 229920002302 Nylon 6,6 Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 230000009422 growth inhibiting effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000013035 low temperature curing Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- AICOOMRHRUFYCM-ZRRPKQBOSA-N oxazine, 1 Chemical compound C([C@@H]1[C@H](C(C[C@]2(C)[C@@H]([C@H](C)N(C)C)[C@H](O)C[C@]21C)=O)CC1=CC2)C[C@H]1[C@@]1(C)[C@H]2N=C(C(C)C)OC1 AICOOMRHRUFYCM-ZRRPKQBOSA-N 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920001610 polycaprolactone Polymers 0.000 description 1
- 239000004632 polycaprolactone Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920005906 polyester polyol Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/0209—Wet presses with extended press nip
- D21F3/0218—Shoe presses
- D21F3/0227—Belts or sleeves therefor
Definitions
- dehydration is performed by passing a transportation felt 3 and a wet web 4 through a press section formed of a press roll 1 and a shoe 5 using a shoe press mechanism in which a loop-like shoe press belt 2 is provided between the press roll 1 and the shoe 5 , as shown, for example, in FIG. 3 .
- the shoe press belt 2 includes a outer peripheral polyurethane layer 21 and a inner peripheral polyurethane layer 22 provided on both surfaces of a reinforcing fiber substrate 6 , which is integrated into the polyurethane layers.
- a large number of concave grooves 24 are formed in the press roll side surface of the outer peripheral polyurethane layer 21 . Water squeezed from a wet web 4 during pressing is held in the concave grooves 24 , and the held water is further transferred to the outside of the press section by the rotation of the belt.
- the concave grooves 24 formed in the press roll side surface of the outer peripheral polyurethane layer 21 should have improved shape retention properties when pressurized by a press roll 1 and the shoe 5 . It is further desired that a convex part 25 of the press roll side surface of the outer peripheral polyurethane layer 21 be improved in mechanical properties such as cracking resistance, resistance to fatigue from flexing, and wear resistance against vertical pressing force by the press roll 1 , the friction of the shoe press belt in a shoe press region, and fatigue from flexing.
- Polyurethanes that exhibit excellent cracking resistance and wear resistance are widely used as resin materials to form the outer peripheral polyurethane layer 21 of the shoe press belt 2 .
- JP-A-11-247086 discloses a shoe press belt including an outer peripheral polyurethane layer and an inner peripheral polyurethane layer provided on both surfaces of a reinforcing fiber substrate, which is integrated into the polyurethane layers.
- the polyurethane of the outer peripheral layer and inner peripheral layer is obtained by heat-curing a urethane prepolymer having a terminal isocyanate group (TAKENATE L2395 manufactured by Takeda Pharmaceutical Company Limited), obtained by reacting toluene-diisocyanate (TDI) with polytetramethylene glycol (PTMG), and 3,3′-dichloro-4,4′-diaminodiphenylmethane (which is a compound commercially available as MBOCA and MOCA and also known as 4,4′-methylene bis-orthochloroaniline or 4,4′-methylene bis-(2-chloroaniline)) as a curing agent (chain extender).
- TAKENATE L2395 manufactured by Takeda
- JP-B-3698984, U.S. Pat. No. 7,374,641, EP 0 855 414, JP-B-3803106, and U.S. Pat. No. 7,090,747 disclose a shoe press belt including an outer peripheral polyurethane layer and an inner peripheral polyurethane layer provided on both surfaces of a reinforcing fiber substrate, which is integrated into the polyurethane layers.
- the polyurethane of the outer peripheral layer is obtained by heat-curing a urethane prepolymer having a terminal isocyanate group (HIPREN L manufactured by Mitsui Chemicals, Inc.), obtained by reacting toluene-diisocyanate (TDI) with polytetramethylene glycol (PTMG), and dimethylthiotoluenediamine (ETHACURE 300).
- HIPREN L a terminal isocyanate group
- PTMG polytetramethylene glycol
- ETHACURE 300 dimethylthiotoluenediamine
- Dimethylthiotoluenediamine is used instead of 3,3′-dichloro-4,4′-diaminodiphenylmethane as a curing agent in JP-B-3698984, U.S. Pat. No. 7,374,641, EP 0 855 414, JP-B-3803106, and U.S. Pat. No. 7,090,747 because: (i) JP-A-7-292237 points out the toxicity of 4,4′-methylenebis-(2-chloroaniline) and recommends use of diethyltolylenediamine as a curing agent (see paragraph [0006]), (ii) the journal “Polyfile,” January 1999, pp.
- ETHACURE 300 New Curing Agent as Substitute for MOCA” describes that ETHACURE 300 has excellent low-temperature curability equivalent to that of MOCA and lower toxicity than MOCA, and thus is used as a substitute for MOCA; and (iii) the journal “POLYMER,” vol. 36, 1995, pp.
- ETHACURE 300 as a substitute for MOCA as a curing agent for a TDI/PTMG-based urethane prepolymer because a polyurethane cured with ETHACURE 300 is superior in low-temperature curability and crack growth inhibiting effect to a polyurethane cured with MOCA (see FIG. 7 and column “Conclusion”).
- JP-A-10-212333 describes both 4,4′-methylenebis-(2-chloroaniline) and dimethylthiotoluenediamine as curing agents for a polyurethane constituting a belt.
- the present invention is directed to a paper making shoe press belt (also referred to as a shoe press belt) used in a paper making shoe press device.
- the present invention is directed to a shoe press belt used in a closed type shoe press.
- Exemplary shoe press belts according to the present invention are excellent in cracking resistance.
- Exemplary shoe press belts according to the present invention include a reinforcing fiber substrate embedded in one or more adjacent polyurethane layers formed from a urethane prepolymer having specific composition that is heat-cured with a mixed chain extender.
- Exemplary shoe press belts according to the present invention exhibit excellent results in a crack occurrence resistance test whether the belts include or do not include grooves in an outermost surface.
- Exemplary shoe press belts according to the present invention may be prepared using both ETHACURE 300 as a main component and another curing agent having excellent low-temperature curability as a subcomponent, as curing agents employed to completely cure a urethane prepolymer.
- a paper making shoe press belt includes a reinforcing fiber substrate and a polyurethane laminate.
- the polyurethane laminate is integrally constituted.
- the reinforcing fiber substrate is embedded in at least one layer of the polyurethane laminate.
- At least one layer of the polyurethane laminate includes a polyurethane obtained by heat-curing a urethane prepolymer (A) together with a mixed curing agent (B).
- the urethane prepolymer (A) includes a terminal isocyanate group.
- the urethane prepolymer (A) is obtained by reacting a diisocyanate compound (a) and a long-chain polyol (b).
- the diisocyanate compound (a) includes at least one of toluene-diisocyanate (TDI), diphenylmethane-diisocyanate (MDI), and paraphenylene-diisocyanate (PPDI).
- the mixed curing agent (B) includes 70-99.5 mol % of dimethylthiotoluenediamine (c) and 0.5-30 mol % of a curing agent (d).
- the curing agent (d) includes at least one of 4,4′-methylenebis(2,6-diethyl-3-chloroaniline), 4,4′-methylenedianiline, and 1,4-butanediol.
- An equivalent ratio of active hydrogen groups of the mixed curing agent (B) to isocyanate groups of the urethane prepolymer (A) ((—H)/(—NCO)) is from 1.02 to 1.15.
- a paper making shoe press belt is formed of a polyurethane, wherein a reinforcing fiber substrate is integrated with polyurethane layers and the reinforcing fiber substrate is buried in the polyurethane, wherein the polyurethane is obtained by heat-curing
- a urethane prepolymer (A) having a terminal isocyanate group obtained by reacting
- an outer peripheral polyurethane layer of the shoe press belt facing a wet web side is formed from a polyurethane that is completely cured with a mixed curing agent, the shoe press belt exhibits improved results in a crack occurrence resistance test.
- FIG. 1 is a cross-sectional view of an exemplary shoe press belt
- FIG. 2 is a cross-sectional view of an exemplary shoe press belt
- FIG. 3 is a cross-sectional view of an exemplary shoe press device
- FIG. 4 is a schematic depiction of a test for crack propagation properties using a De Mattia flex tester.
- FIG. 5 is a schematic depiction of a test for measuring crack occurrence in a shoe press belt.
- FIG. 1 is a cross-sectional view of an exemplary shoe press belt 1 according to the present invention, in which a reinforcing fiber substrate 6 is integrated with a polyurethane in an outer peripheral layer 21 and an inner peripheral layer 22 .
- the reinforcing fiber substrate 6 is embedded in the polyurethane, and grooves 24 are formed in the outer peripheral polyurethane layer 21 .
- FIG. 2 illustrates an alternative exemplary embodiment of the present invention, in which grooves 24 are not formed in an outer peripheral polyurethane layer.
- FIG. 2( a ) shows a configuration in which a reinforcing fiber substrate 6 is embedded at the interface of an outer peripheral polyurethane layer 2 a and an inner peripheral polyurethane layer 2 b , the layers being of like composition.
- FIG. 2( b ) shows a configuration in which a reinforcing fiber substrate 6 is embedded at the interface of an outer peripheral polyurethane layer 2 a and an inner peripheral polyurethane layer 2 b , the layers being of different composition.
- FIG. 2( c ) shows a configuration in which a reinforcing fiber substrate 6 is embedded in an intermediate polyurethane layer 2 c provided between an outer peripheral polyurethane layer 2 a and an inner peripheral polyurethane layer 2 b.
- FIG. 3 is a simplified diagram of a shoe press mechanism in a paper making machine.
- reference numeral 2 denotes a shoe press belt
- reference numeral 4 denotes a wet web
- reference numeral 3 denotes a paper-making felt
- reference numeral 1 denotes a press roll
- reference numeral 5 denotes a shoe.
- FIG. 4 is an explanatory drawing showing conduct of a test for crack propagation properties of a polyurethane test piece 61 using a De Mattia flex tester.
- FIG. 5 is an explanatory drawing of a tester 42 for measuring crack occurrence in a shoe press belt 41 .
- the reinforcing fiber substrate 6 may be a woven fabric as described in JP-A-11-247086, U.S. Pat. No. 7,374,641, or EP 0 855 414, or alternative reinforcing fiber substrates described in other documents.
- the reinforcing fiber substrate 6 may be a grid-like material in which 5000 dtex multifilament twisted yarns of polyethylene terephthalate (PET) fibers are used as warp and weft, the warp is sandwiched in the weft, and the intersections between the weft and the warp are bonded by polyurethane adhesion.
- PET polyethylene terephthalate
- polyamide fibers such as fibers of aramid, nylon 6,6, nylon 6,10, and nylon 6 may be used instead of polyethylene terephthalate fibers. Further, fibers made of different materials may be used for the warp and the weft, or warp and weft having different thicknesses like 5000 dtex and 7000 dtex may be used.
- the polyurethane that forms the outer peripheral polyurethane layer 21 of the shoe press belt is a polyurethane with a JIS-A hardness of 90 to 99, preferably 94 to 97, obtained by heat-curing a urethane prepolymer (A) having a terminal isocyanate group, obtained by reacting (a) a diisocyanate compound selected from toluene-diisocyanate (TDI), diphenylmethane-diisocyanate (MDI), and paraphenylene-diisocyanate (PPDI) with (b) a long-chain polyol, and a mixed curing agent (B) comprising (c) 70-99.5 mol % of dimethylthiotoluenediamine and (d) 0.5-30 mol % of a curing agent selected from 4,4′-methylenebis(2,6-diethyl-3-chloroaniline), 4,4′-methylenedianiline, and 1,4
- TDI to
- the polyurethane that forms the inner peripheral polyurethane layer 22 of the shoe press belt may be identical to the polyurethane that forms the outer peripheral polyurethane layer 21 or may be a polyurethane having different composition.
- the long-chain polyol which is the raw material of the urethane prepolymer (A) may include one or two or more polyol compounds selected from polyether polyols, polyester polyols, polycaprolactone polyols, and polycarbonate polyols.
- polyether polyols polyether polyols
- polyester polyols polycaprolactone polyols
- polycarbonate polyols polycarbonate polyols.
- polytetramethylene glycol (PTMG) polyethylene glycol
- PEG polyethylene glycol
- PPG propylene glycol
- the shoe press belt is manufactured by a method in which a mandrel surface coated with a mold release agent is coated and impregnated with a mixture of a urethane prepolymer and a mixed curing agent for forming an inner peripheral polyurethane layer while rotating the mandrel so that the inner peripheral polyurethane layer is formed to a thickness of 0.8-3.5 mm on a mandrel surface.
- the resulting layer is pre-cured at 85-125° C. for 0.5-1 hour.
- a reinforcing fiber substrate is wound therearound and a mixture of a urethane prepolymer and a curing agent for forming an intermediate layer is then coated to a thickness of 0.5-2 mm.
- the reinforcing fiber substrate is impregnated with the mixture which also adheres to the inner peripheral polyurethane layer, and the resulting layer is pre-cured at 50-120° C. for 0.5-1 hour. Thereafter, the surface of the reinforcing fiber substrate is coated and impregnated with a mixture of a urethane prepolymer and a curing agent for forming an outer peripheral polyurethane layer while rotating the mandrel so that the outer peripheral polyurethane layer is formed to a thickness of 1.5-4 mm. The resulting structure is cured at 100-130° C. for 2-20 hours. Thereafter, grooves as illustrated in FIG. 1 are carved into the outer peripheral polyurethane layer.
- the grooves may be carved into the outer peripheral polyurethane layer by bringing a heated emboss roll having a surface with protrusions having heights of groove depths into pressure contact with the outer peripheral polyurethane layer during curing of the outer peripheral polyurethane layer.
- the mandrel includes a heating apparatus.
- the shoe press belt is manufactured by a method in which a mandrel surface coated with a mold release agent is coated with a mixture of a urethane prepolymer and a mixed curing agent for forming an inner peripheral polyurethane layer so that the inner peripheral polyurethane layer is formed to a thickness of 0.8-3 mm.
- the resulting layer is pre-cured at 70-130° C. for 0.5-2 hours.
- a reinforcing fiber substrate is then wound around the external surface of the inner peripheral polyurethane layer and a mixture of a urethane prepolymer and a curing agent for forming an intermediate layer is coated to a thickness of 0.5-2 mm.
- the reinforcing fiber substrate is impregnated with the mixture, which also adheres to the inner peripheral polyurethane layer.
- the resulting layer is pre-cured at 50-120° C. for 0.5-1 hour.
- a mixture of a urethane prepolymer and a mixed curing agent for forming an outer peripheral polyurethane layer is coated so that the outer peripheral polyurethane layer has a thickness of 2-4 mm.
- the resulting structure is cured at 70-130° C. for 12-20 hours. Grooves are cut and processed in the outer peripheral polyurethane layer with a cutting tool, and the outer peripheral polyurethane layer is polished with sandpaper or a polyurethane abrasive cloth.
- the shoe press belt is manufactured by a method in which a mandrel surface coated with a mold release agent is coated with a mixture of a urethane prepolymer and a curing agent for forming an inner peripheral polyurethane layer so that the inner peripheral polyurethane layer is formed to a thickness of 0.8-3 mm.
- the resulting layer is pre-cured at 50-140° C. for 0.5-2 hours.
- An intermediate polyurethane layer having a thickness of 1-2 mm in which a reinforcing fiber substrate is embedded (produced beforehand) is wound around the outer surface of the inner peripheral polyurethane layer.
- the intermediate layer is pressed by a nip roll heated to 50-140° C.
- a mixture of a urethane prepolymer and a mixed curing agent for forming an outer peripheral polyurethane layer is further coated so that the outer peripheral polyurethane layer is formed to a thickness of 2-4 mm.
- the resulting structure is cured at 70-140° C. for 2-20 hours.
- the outer peripheral polyurethane layer is polished with sandpaper or a polyurethane abrasive cloth. Grooves are cut and processed in the polished outer peripheral polyurethane layer with a cutting tool.
- the shoe press belt is manufactured by a method using two rolls instead of a mandrel.
- an endless reinforcing fiber substrate is extended between two rolls.
- the surface of the reinforcing fiber substrate is coated with a mixture of a urethane prepolymer and a curing agent.
- the reinforcing fiber substrate is impregnated with the mixture and the resulting structure is pre-cured at 50-120° C. for 0.5-2 hours.
- a mixture of a urethane prepolymer and a mixed curing agent for forming an inner peripheral polyurethane layer is coated onto the reinforcing fiber substrate so that the inner peripheral polyurethane layer is formed to a thickness of 0.5-3 mm.
- the resulting structure is pre-cured at 70-140° C. for 2-12 hours.
- a surface of the inner peripheral polyurethane layer is polished with sandpaper or an abrasive cloth.
- the semifinished product is reversed, hung on the two rolls, and extended.
- the surface of the extended semifinished product is coated with a mixture of a urethane prepolymer and a mixed curing agent for forming an outer peripheral polyurethane layer to impregnate the reinforcing fiber substrate.
- the surface of the extended semifinished product is further coated with the mixture so that the outer peripheral polyurethane layer is formed to a thickness of 1.5-4 mm.
- the resulting structure is cured at 70-140° C. for 2-20 hours. After curing, the outer peripheral polyurethane layer is polished to a predetermined thickness, and grooves are cut and processed in the outer peripheral polyurethane layer with a cutting tool.
- polyurethane test pieces were produced as described below.
- a urethane prepolymer (percentage of NCO: 6.02%, viscosity at 80° C.: 400 cps, preheat temperature: 66° C.) obtained by reacting toluene-diisocyanate (TDI) with polytetramethylene glycol (PTMG) and a mixed curing agent consisting of 90 mol % of dimethylthiotoluenediamine (ETHACURE 300) and 10 mol % of 1,4-butanediol (H/NCO ratio of the mixed curing agent to the urethane prepolymer would be 1.05) were poured into a preheated die, heated to 100° C., precured at 100° C. for 0.5 hour, then removed from the die, and post-cured at 100° C. for 16 hours to obtain a polyurethane sheet. A test piece (thickness of 3.5 mm) was produced from the sheet.
- a urethane prepolymer (percentage of NCO: 6.02%, viscosity at 80° C.: 400 cps, preheat temperature: 66° C.) obtained by reacting toluene-diisocyanate (TDI) with polytetramethylene glycol (PTMG) and a curing agent composed of dimethylthiotoluenediamine (ETHACURE 300) (H/NCO ratio of the mixed curing agent to the urethane prepolymer would be 0.95) were poured into a preheated die, heated to 100° C., precured at 100° C. for 0.5 hour, then removed from the die, and post-cured at 100° C. for 16 hours to obtain a polyurethane sheet. A test piece (thickness of 3.5 mm) was produced from the sheet.
- Polyurethane sheets were obtained in the same manner as in Reference Example 1 except that urethane prepolymers listed in TABLE 1 and TABLE 2 as urethane prepolymers and curing agents listed in TABLE 1 and TABLE 2 as curing agents were used at H/NCO ratios listed in the tables and under preheating and curing conditions listed in the tables. Test pieces (thicknesses of 3.5 mm) were produced from the sheets.
- the curing agents listed in TABLE 1 and TABLE 2 are dimethylthiotoluenediamine (ETHACURE 300), 4,4′-methylenebis(2,6-diethyl-3-chloroaniline) (LONZACURE MCDEA), 4,4′-methylenedianiline (CAYTUR 31DA), 1,4-butanediol (1,4-BD), and 4,4′-methylenebis-(2-chloroaniline) (MOCA).
- CAYTUR 31DA is a complex of 4,4′-methylenedianiline and sodium chloride dispersed in dioctyl adipate (DOA).
- the polyurethane sheet test pieces obtained in Examples 1-13 were subjected to a De Mattia flex test.
- a test for crack propagation properties was conducted using a tester, illustrated in FIG. 4 , similar to that in the De Mattia flex test defined in JIS-K-6260 (2005) under an atmosphere at 20° C. and a relative humidity of 52% under the following conditions.
- the test piece 61 had a width of 25 mm, a length of 185 mm (including one side of tong hold of 20 mm), a length of 150 mm between grippers 62 , a thickness of 3.4 mm, and a semicircular dimple 61 a having a radius of 1.5 mm in a center.
- the maximum distance between the grippers was 100 mm, the minimum distance was 35 mm, a motion distance was 65 mm, and a reciprocation speed was 360 reciprocations/min.
- a slit having a length of about 2 mm was notched in the center of the test piece in a width direction.
- the right and left grippers were set to be at angles of 45° with respect to a reciprocation direction, respectively. Flexing was repeated under the foregoing conditions and crack length was measured after predetermined increments of strokes.
- the number of strokes as used herein was a value obtained by multiplying test time by reciprocation speed.
- the test was finished when the crack length exceeded 15 mm from a measurement value of an early notch length (about 2 mm), an approximate curve of the number of strokes and the crack length was drawn, the number of strokes was read when the crack length was 15 mm, and a value obtained by dividing a growing crack length (15 mm in crack length ⁇ measurement value of early notch length) by the number of strokes at this time was regarded as a crack propagation property.
- the obtained physical properties are summarized in TABLE 1 and TABLE 2.
- Example 6 Urethane prepolymer Isocyanate TDI TDI TDI MDI TDI/MDI 5/5 Polyol PTMG PTMG PTMG PTMG PTMG PTMG PTMG NCO (%) 6.02 6.02 6.02 6.02 8.85 7.44 Viscosity (cps) 400 400 400 400 400 600 (@80° C.) (@80° C.) (@80° C.) (@100° C.) (@80° C.) Preheat temperature (° C.) 66 66 66 66 80 80 Curing agent ETHACURE ETHACURE MOCA MOCA ETHACURE ETHACURE (compound name) 300 300 300 300 300 300 300 Equivalent value 107.15 107.15 133.6 133.6 107.15 107.15 Active hydrogen (mol %) 100 100 100 100 100
- Shoe press belts were prepared using the polyurethane compositions described above in the manner described below.
- Step 1 A release agent (KS-61: manufactured by Shin-Etsu Chemical Co., Ltd.) was coated on the surface of a mandrel having a diameter of 1500 mm and that was rotatable by driving means. Then, a composition prepared by mixing the urethane prepolymer (TDI/PTMG-based prepolymer) and the mixed curing agent as specified in Reference Example 1 was spirally coated onto the rotating mandrel to a thickness of 1.4 mm using an injection molding nozzle movable in parallel to the rotation axis of the mandrel, and a urethane resin layer was formed. The layer was left to stand at room temperature for 40 minutes while rotating the mandrel, and the resin was further heated at 115° C. for 0.5 hour by a heating apparatus attached to the mandrel and precured to produce a shoe side inner peripheral polyurethane layer.
- KS-61 manufactured by Shin-Etsu Chemical Co., Ltd.
- Step 2 A grid-like material was prepared using a 5000 dtex multifilament twisted yarn of polyethylene terephthalate fibers as weft and a 550 dtex multifilament yarn of polyethylene terephthalate fibers as warp. The warp was sandwiched in the weft, and the intersections between the weft and the warp were bonded by urethane-based resin adhesion (warp density of 1 strand/cm; and weft density of 4 strands/cm). One layer of the grid-like material having a plurality of pieces was placed on the outer periphery of the shoe side layer without any gap so that the weft was along the axial direction of the mandrel.
- 6700 dtex multifilament yarn of polyethylene terephthalate fibers was helically wound around the outer periphery of the grid-like material at a pitch of 30 strands/5 cm to form a spool layer. Then, the polyurethane composition was coated to a thickness of about 1.6 mm and integrated as an intermediate layer to fill the gap between the grid-like material and the spool layer, and a reinforcing fiber substrate polyurethane intermediate layer was formed.
- Step 3 A composition prepared by mixing the urethane prepolymer and the curing agent as specified in Reference Example 1 was impregnated and coated to a thickness of about 2.5 mm on the intermediate layer by spiral coating, heated at 115° C. for 16 hours, and post-cured to produce an outer peripheral layer.
- the surface of the outer peripheral layer was polished to have an overall thickness of 5.2 mm, and a shoe press belt was obtained by forming a large number of concave grooves (of 1.0 mm in groove width, 1.0 mm in depth, and 3.18 mm in pitch width) in the machine direction of the belt by a rotary blade.
- a shoe press belt was obtained in the same manner as in Example 1 except that the polyurethane composition used in Reference Example 6 was used instead of the polyurethane composition in Reference Example 1 and the curing conditions of precuring and post-curing were changed to 100° C. for 0.5 hour and 100° C. for 16 hours, respectively.
- Shoe press belts were obtained in the same manner as in Example 1 except that the urethane prepolymers listed in TABLE 1 and TABLE 2 as urethane prepolymers and the curing agents listed in TABLE 1 and TABLE 2 as curing agents were used under the preheating and curing conditions listed in the tables.
- a flexing fatigue test was conducted for the obtained shoe press belts.
- the flexing fatigue test was conducted by evaluating the grooved belt samples.
- As the flexing fatigue test a crack occurrence test was conducted under an atmosphere of 20° C. and a relative humidity of 52% using the device illustrated in FIG. 5 .
- the test piece 71 had a width of 60 mm and a length between grippers of 70 mm.
- an upper gripper 42 b and the test piece also reciprocated along a circular-arc path so that the test piece was flexed to cause fatigue on the top of the lower gripper.
- a distance between the center of the circular arc and the top of the lower gripper was 168 mm, the migration length of the lower gripper was 161 mm, and a reciprocation speed was 162 reciprocations/min.
- the weight of the upper gripper was 400 g. Flexing was repeated under the conditions specified, and the number of flexings until a crack occurred was measured. All the shoe press belts according to Examples exhibited the results in which 1 million flexings could be born. The results are listed in TABLE 3 and TABLE 4.
- Example 1 Example 2
- Example 3 Example 4
- Example 5 Example 6
- shoe press belts according to embodiments of the present invention are excellent in low-temperature curing properties, exhibit improved crack occurrence inhibiting effect, and have excellent practical values in comparison with known shoe press belts (e.g., as in the Comparative Examples).
Landscapes
- Paper (AREA)
- Polyurethanes Or Polyureas (AREA)
- Reinforced Plastic Materials (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012020045A JP5161376B1 (ja) | 2012-02-01 | 2012-02-01 | 製紙用シュープレスベルト |
JP2012-020045 | 2012-02-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20130192787A1 true US20130192787A1 (en) | 2013-08-01 |
Family
ID=47715822
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/541,907 Abandoned US20130192787A1 (en) | 2012-02-01 | 2012-07-05 | Paper making shoe press belt |
Country Status (4)
Country | Link |
---|---|
US (1) | US20130192787A1 (fr) |
EP (1) | EP2623667B1 (fr) |
JP (1) | JP5161376B1 (fr) |
CN (1) | CN103243603B (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160130755A1 (en) * | 2013-06-14 | 2016-05-12 | Ichikawa Co., Ltd. | Shoe press belt for papermaking |
US20160208437A1 (en) * | 2015-01-16 | 2016-07-21 | Ichikawa Co., Ltd. | Shoe press belt and method of manufacturing the same |
US20170218568A1 (en) * | 2016-02-01 | 2017-08-03 | Ichikawa Co., Ltd. | Shoe press belt |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017117227A1 (de) * | 2017-07-31 | 2019-01-31 | Voith Patent Gmbh | Pressmantel und dessen Verwendung sowie Presswalze und Schuhpresse |
JP6580774B1 (ja) * | 2018-05-16 | 2019-09-25 | 第一工業製薬株式会社 | 熱可塑性マトリックス樹脂形成用二液硬化型組成物、繊維強化複合材料用マトリックス樹脂、及び繊維強化複合材料 |
DE102018122782A1 (de) * | 2018-09-18 | 2020-03-19 | Voith Patent Gmbh | Pressmantel, dessen Verwendung sowie Presswalze und Schuhpresse |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07292237A (ja) | 1994-04-28 | 1995-11-07 | Bando Chem Ind Ltd | ベルト用ポリウレタン組成物 |
US5821316A (en) | 1997-01-24 | 1998-10-13 | Air Products And Chemicals, Inc. | Polyurethane prepolymers for making elastomers having improved dynamic properties |
JP3408416B2 (ja) | 1998-02-26 | 2003-05-19 | 市川毛織株式会社 | シュープレス用ベルト及びその製造法 |
JP3698984B2 (ja) | 2000-11-10 | 2005-09-21 | ヤマウチ株式会社 | シュープレス用ベルト |
JP3803106B2 (ja) * | 2004-11-26 | 2006-08-02 | ヤマウチ株式会社 | 製紙用ベルトおよび製紙用ベルトの製造方法 |
JP2006225839A (ja) * | 2006-04-03 | 2006-08-31 | Yamauchi Corp | シュープレス用ベルト |
JP4516583B2 (ja) * | 2007-05-18 | 2010-08-04 | イチカワ株式会社 | シュープレス用ベルト |
CA2692264C (fr) * | 2007-06-25 | 2014-09-23 | Ichikawa Co., Ltd. | Bande de presse a sabot pour la fabrication de papier |
JP2010116652A (ja) * | 2008-11-14 | 2010-05-27 | Ichikawa Co Ltd | シュープレス用ベルト |
JP4444367B1 (ja) * | 2009-07-21 | 2010-03-31 | イチカワ株式会社 | 製紙用シュープレスベルト |
-
2012
- 2012-02-01 JP JP2012020045A patent/JP5161376B1/ja active Active
- 2012-07-05 US US13/541,907 patent/US20130192787A1/en not_active Abandoned
-
2013
- 2013-02-01 EP EP13000525.9A patent/EP2623667B1/fr active Active
- 2013-02-01 CN CN201310041248.8A patent/CN103243603B/zh active Active
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160130755A1 (en) * | 2013-06-14 | 2016-05-12 | Ichikawa Co., Ltd. | Shoe press belt for papermaking |
US9732470B2 (en) * | 2013-06-14 | 2017-08-15 | Ichikawa Co., Ltd. | Shoe press belt for papermaking |
US20160208437A1 (en) * | 2015-01-16 | 2016-07-21 | Ichikawa Co., Ltd. | Shoe press belt and method of manufacturing the same |
US10196777B2 (en) * | 2015-01-16 | 2019-02-05 | Ichikawa Co., Ltd. | Shoe press belt and method of manufacturing the same |
US20170218568A1 (en) * | 2016-02-01 | 2017-08-03 | Ichikawa Co., Ltd. | Shoe press belt |
US10036120B2 (en) * | 2016-02-01 | 2018-07-31 | Ichikawa Co., Ltd. | Shoe press belt |
Also Published As
Publication number | Publication date |
---|---|
EP2623667A1 (fr) | 2013-08-07 |
CN103243603A (zh) | 2013-08-14 |
JP2013159860A (ja) | 2013-08-19 |
CN103243603B (zh) | 2015-12-09 |
EP2623667B1 (fr) | 2015-04-08 |
JP5161376B1 (ja) | 2013-03-13 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4516610B2 (ja) | シュープレス用ベルト | |
EP3101174B1 (fr) | Courroie de presse à sabot | |
JP4444367B1 (ja) | 製紙用シュープレスベルト | |
KR101075479B1 (ko) | 제지용 슈프레스 벨트 | |
JP4516583B2 (ja) | シュープレス用ベルト | |
EP3009561B1 (fr) | Courroie de presse à sabot pour la fabrication du papier | |
EP2623667B1 (fr) | Courroie de presse à sabot pour la fabrication de papier | |
JP4516584B2 (ja) | 製紙用シュープレスベルト | |
EP2623668B1 (fr) | Courroie de presse à sabot pour la fabrication de papier | |
JP7290127B2 (ja) | シュープレスベルトおよびシュープレスベルトの製造方法 | |
JP7290128B2 (ja) | シュープレスベルトおよびシュープレスベルトの製造方法 | |
JP7205506B2 (ja) | シュープレスベルトおよびシュープレスベルトの製造方法 | |
CN113322708A (zh) | 靴形压榨带及靴形压榨带的制备方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: ICHIKAWA CO., LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:YAZAKI, TAKAO;YAMAZAKI, SHINTARO;TAKAMORI, YUYA;SIGNING DATES FROM 20120628 TO 20120703;REEL/FRAME:028491/0748 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |