CN115821571A - Method for improving initial performance of papermaking felt - Google Patents
Method for improving initial performance of papermaking felt Download PDFInfo
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- CN115821571A CN115821571A CN202211580817.1A CN202211580817A CN115821571A CN 115821571 A CN115821571 A CN 115821571A CN 202211580817 A CN202211580817 A CN 202211580817A CN 115821571 A CN115821571 A CN 115821571A
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- papermaking felt
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- papermaking
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000003607 modifier Substances 0.000 claims abstract description 64
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 39
- 238000001035 drying Methods 0.000 claims abstract description 31
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 29
- 229930040373 Paraformaldehyde Natural products 0.000 claims abstract description 27
- 229920002866 paraformaldehyde Polymers 0.000 claims abstract description 27
- 238000005406 washing Methods 0.000 claims abstract description 27
- 230000002708 enhancing effect Effects 0.000 claims abstract description 21
- 238000002791 soaking Methods 0.000 claims abstract description 19
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 18
- 239000003513 alkali Substances 0.000 claims abstract description 17
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000004140 cleaning Methods 0.000 claims abstract description 6
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 238000007493 shaping process Methods 0.000 claims abstract description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 52
- 229920000877 Melamine resin Polymers 0.000 claims description 38
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims description 38
- 239000000243 solution Substances 0.000 claims description 30
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 26
- 238000006243 chemical reaction Methods 0.000 claims description 23
- 238000003756 stirring Methods 0.000 claims description 16
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 239000013067 intermediate product Substances 0.000 claims description 15
- 239000003054 catalyst Substances 0.000 claims description 14
- 125000004029 hydroxymethyl group Chemical group [H]OC([H])([H])* 0.000 claims description 12
- 229920005989 resin Polymers 0.000 claims description 12
- 239000011347 resin Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000007864 aqueous solution Substances 0.000 claims description 10
- 238000000967 suction filtration Methods 0.000 claims description 10
- 229940113088 dimethylacetamide Drugs 0.000 claims description 9
- IYDGMDWEHDFVQI-UHFFFAOYSA-N phosphoric acid;trioxotungsten Chemical group O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.OP(O)(O)=O IYDGMDWEHDFVQI-UHFFFAOYSA-N 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 230000002378 acidificating effect Effects 0.000 claims description 4
- 238000010902 jet-milling Methods 0.000 claims description 4
- 239000000428 dust Substances 0.000 abstract description 7
- 239000012535 impurity Substances 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 29
- 239000012744 reinforcing agent Substances 0.000 description 22
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 15
- 239000003063 flame retardant Substances 0.000 description 15
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 9
- 238000012360 testing method Methods 0.000 description 9
- 230000003247 decreasing effect Effects 0.000 description 8
- 238000001514 detection method Methods 0.000 description 7
- WQDUMFSSJAZKTM-UHFFFAOYSA-N Sodium methoxide Chemical compound [Na+].[O-]C WQDUMFSSJAZKTM-UHFFFAOYSA-N 0.000 description 6
- 239000008367 deionised water Substances 0.000 description 6
- 229910021641 deionized water Inorganic materials 0.000 description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 229910052698 phosphorus Inorganic materials 0.000 description 5
- 239000011574 phosphorus Substances 0.000 description 5
- 238000009998 heat setting Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- CGFYHILWFSGVJS-UHFFFAOYSA-N silicic acid;trioxotungsten Chemical compound O[Si](O)(O)O.O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1.O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1.O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1.O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1 CGFYHILWFSGVJS-UHFFFAOYSA-N 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- LBLYYCQCTBFVLH-UHFFFAOYSA-N 2-Methylbenzenesulfonic acid Chemical compound CC1=CC=CC=C1S(O)(=O)=O LBLYYCQCTBFVLH-UHFFFAOYSA-N 0.000 description 3
- JXBAVRIYDKLCOE-UHFFFAOYSA-N [C].[P] Chemical compound [C].[P] JXBAVRIYDKLCOE-UHFFFAOYSA-N 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 125000003277 amino group Chemical group 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000007127 saponification reaction Methods 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 229920002994 synthetic fiber Polymers 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- KIRIXOGQHXHZKY-UHFFFAOYSA-N 1,1,2,2,3,3,4,4,5,5,6,6,7-tridecafluorooctan-1-ol Chemical compound CC(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(O)(F)F KIRIXOGQHXHZKY-UHFFFAOYSA-N 0.000 description 1
- 238000012935 Averaging Methods 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- YUWBVKYVJWNVLE-UHFFFAOYSA-N [N].[P] Chemical compound [N].[P] YUWBVKYVJWNVLE-UHFFFAOYSA-N 0.000 description 1
- 230000003373 anti-fouling effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 125000002023 trifluoromethyl group Chemical group FC(F)(F)* 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
Abstract
The application relates to a method for improving the initial performance of a papermaking felt, which comprises the following steps: s1, soaking a newly prepared papermaking felt in alkali liquor, taking out the papermaking felt after soaking, washing the papermaking felt by using a washing reagent, and cleaning residual alkali liquor to obtain a clean papermaking felt; s2, drying the clean papermaking felt obtained in the step S1, soaking the clean papermaking felt into a reinforcing reagent, taking out the clean papermaking felt, drying the clean papermaking felt again to enable a reinforcing reagent layer to be attached to the surface of the clean papermaking felt, and then shaping the clean papermaking felt to obtain a papermaking felt with high initial performance; in the step S2, raw materials of the enhancing reagent comprise a modifier, paraformaldehyde, dimethylacetamide, methanol and 1H, 2H-tridecafluoro-1-octanol. This application uses alkali lye to soak the washing to the papermaking woollen blanket of newly-prepared, gets rid of the greasy dirt and the dust impurity on papermaking woollen blanket surface, has reduced the emergence of the phenomenon of the attached greasy dirt of papermaking woollen blanket surface of newly-prepared and dust increase papermaking woollen blanket surface's resistance, promotes the initial performance of new papermaking woollen blanket.
Description
Technical Field
The present application relates to the field of papermaking felts, and more particularly, to a method for improving the starting performance of a papermaking felt.
Background
The paper-making felt is a fabric felt used for forming and conveying paper in paper-making industry, and is made up by using synthetic fibre to make base fabric with thick and thin cloth eye, then laying a mixed fibre web of synthetic fibre and a small quantity of wool, needling, chemical treatment, resin finishing and heat-setting.
The newly manufactured papermaking felt is easy to have greasy dirt adhered to the surface, the greasy dirt adhered to the surface of the papermaking felt is easy to combine with dust, and the dried greasy dirt can form small particles on the surface of the papermaking felt, so that the resistance of the surface of the papermaking felt is improved, the speed of a machine is reduced, the speed of a papermaking machine is reduced, and the conveying efficiency of paper is reduced, therefore, the inventor thinks that a method for improving the initial performance of the papermaking felt is needed to be developed.
Disclosure of Invention
In order to improve the starting performance of the papermaking felt, the application provides a method for improving the starting performance of the papermaking felt.
The method for improving the initial performance of the papermaking felt adopts the following technical scheme:
a method of improving the starting performance of a papermaking felt, comprising the steps of:
s1, soaking a newly prepared papermaking felt in 3-5% alkali liquor for 2-4h, taking out the papermaking felt, washing with a washing reagent, and cleaning residual alkali liquor to obtain a clean papermaking felt;
s2, drying the clean papermaking felt in the step S1, then soaking the clean papermaking felt in a reinforcing reagent for 6-8 hours, then taking out the soaked clean papermaking felt, drying the clean papermaking felt again to enable a reinforcing reagent layer to be attached to the surface of the clean papermaking felt, then shaping, and obtaining the papermaking felt with high initial performance after shaping;
in the step S2, raw materials of the enhancing reagent comprise a modifier, paraformaldehyde, dimethylacetamide, methanol and 1H, 2H-tridecafluoro-1-octanol.
The method comprises the following steps that firstly, a papermaking felt is soaked in alkali liquor, oil stains on the surface of the papermaking felt and the alkali liquor are subjected to saponification reaction, so that grease on the surface of the papermaking felt is decomposed, then, a washing reagent is used for washing, the oil stains on the surface of the papermaking felt can be washed clean, a clean papermaking felt is obtained, after the oil stains with dust on the surface of the clean papermaking felt are washed, the resistance of the clean papermaking felt is reduced, the phenomenon that the machine speed of a newly-prepared papermaking felt is reduced due to the oil stains and the dust is reduced, and the initial performance of the papermaking felt is improved;
the clean papermaking felt is soaked in the enhancing reagent, the enhancing reagent is prepared from a modifier, paraformaldehyde, dimethylacetamide, methanol, 1H, 2H-tridecafluoro-1-octanol, the modifier and paraformaldehyde are used as raw materials, dimethylacetamide is used as a solvent, a resin material can be prepared, the 1H, 2H-tridecafluoro-1-octanol is introduced into a system, the contact angle of the modifier is improved, the enhancing reagent has oleophobic property, subsequent oil stains are prevented from being attached to the surface of the papermaking felt, the enhancing reagent is combined with impurities such as dust and the like to generate particles, the resistance of the surface of the papermaking felt is increased, the use performance of the papermaking felt is influenced, after the enhancing reagent is attached to the surface of the papermaking felt, the thermal stability of the papermaking felt is improved, and the service life of the papermaking felt is prolonged.
Preferably, the enhancing agent is prepared by the following method:
(1) Adjusting the pH value of dimethyl acetamide to 9-10, then mixing with a modifier and paraformaldehyde, and stirring and reacting at 85-95 ℃ for 40-60min to obtain a colorless and transparent hydroxymethyl modifier solution;
(2) Adjusting the pH value of the hydroxymethyl modifier prepared in the step (1) to be acidic, adding 1H, 2H-tridecafluoro-1-octanol, heating, stirring for reacting for 40min, adjusting the pH value of a system to be 8 after reacting to obtain modified resin, and dissolving the modified resin in methanol to obtain the reinforcing reagent.
Preferably, the pH value of the hydroxymethyl modifier adjusted to be acidic in step S2 is adjusted within a range of 5.5 to 6.5, and the temperature rise temperature is 85 to 95 ℃.
Preferably, the mass ratio of the modifier to the paraformaldehyde to the 1H, 2H-tridecafluoro-1-octanol is 1 (2.6-2.8) to (0.02-0.04).
By controlling the mass ratio of the modifier, paraformaldehyde, and 1H,2H, and tridecafluoro-1-octanol within the above range, an enhancing agent having a better performance can be obtained.
Preferably, the modifier raw materials comprise melamine, phosphoric acid and a catalyst.
The phosphoric acid contains phosphorus, and after the phosphoric acid and the melamine are combined and modified, the flame retardant property of the enhancing reagent can be synergistically improved, so that the papermaking felt has good flame retardant property, a phosphorus-carbon expanded heat insulation layer can be generated on the surface of the papermaking felt when the papermaking felt is burnt, the heat conduction is reduced, and the flame retardant effect is achieved; meanwhile, the melamine has the performances of high temperature resistance, scraping resistance and high mechanical strength, and has stable chemical performance, thereby improving the mechanical property of the modifier.
Preferably, the mass ratio between the melamine and the phosphoric acid is 1 (0.7-0.9).
By controlling the mass ratio between melamine and phosphoric acid within the above range, a modifier having more excellent properties can be obtained.
Preferably, the modifier is prepared by adopting the following method:
dissolving melamine to obtain a melamine aqueous solution, adding phosphoric acid into the melamine aqueous solution, reacting for 2 hours, adding a catalyst, continuing to react to obtain a reaction solution, cooling to room temperature, carrying out suction filtration and washing on the reaction solution, drying for 4 hours to obtain an intermediate product, crushing the intermediate product, carrying out suction filtration and washing again, drying the washed intermediate product again, and carrying out jet milling to obtain the modifier.
The modifier is processed and synthesized by melamine and phosphoric acid, so that the synergistic flame retardant property of the melamine is improved, and meanwhile, the modifier prepared by the preparation method can improve the thermal stability of the modifier.
Preferably, the catalyst is phosphotungstic acid.
The phosphotungstic acid is used as a catalyst for the reaction, so that the caking phenomenon in the reaction can be reduced, the reaction temperature is easy to control, the occurrence phenomenon of local overheating reaction in the reaction process is greatly reduced, the reaction is more stable, and the purity of the obtained product is improved.
Preferably, the alkali solution in step S1 is a sodium hydroxide solution with a mass concentration of 3-5%, and the cleaning reagent in step S2 is clear water.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the newly prepared papermaking felt is washed by alkali liquor, and the alkali liquor and grease are subjected to saponification reaction, so that oil stains attached to the surface of the papermaking felt can be removed, the influence of the oil stains on the machine of the papermaking felt is reduced, the resistance of the surface of the papermaking felt is reduced, the machine speed of the papermaking felt is increased, the initial performance of the papermaking felt is improved, and the working efficiency of the newly prepared papermaking felt is further improved; the enhancing reagent is prepared from the modifier, paraformaldehyde and 1H, 2H-tridecafluoro-1-octanol, and can increase the contact angle of the surface of the modifier, so that the enhancing reagent has good oleophobic performance, the phenomenon that impurities such as subsequent oil stain, dust and the like are attached to a papermaking felt can be reduced, the cleaning performance of the papermaking felt is improved, and the service life of the papermaking felt is prolonged;
2. the modifier is prepared from melamine and phosphoric acid, the phosphoric acid enables the enhancing reagent to introduce phosphorus, the phosphorus and the melamine are cooperated to improve the flame retardant property, a layer of compact phosphorus-nitrogen expansion heat insulation layer is generated on the surface of the papermaking felt when the papermaking felt burns, on one hand, heat can be isolated, on the other hand, the continuous burning of the papermaking felt can be reduced, so that the papermaking felt has the flame retardant property and plays a role in fire prevention, and the melamine has good high temperature resistance and wear resistance, and the mechanical property of the enhancing reagent can be improved.
Detailed Description
The embodiments of the present application disclose a method for improving the initial performance of a papermaking felt, and the following embodiments are combined to further describe the present application in detail.
Example 1
Preparing a modifier:
adding 11.76g of melamine into 5L of deionized water, stirring and dissolving at 90 ℃ to obtain a melamine aqueous solution, adding 8.24g of phosphoric acid into the melamine aqueous solution, reacting at 85 ℃ for 2 hours, adding 0.12g of a catalyst, continuing to react for 3 hours to obtain a reaction solution, cooling the reaction solution to room temperature, carrying out suction filtration on the reaction solution, washing with deionized water, drying at 120 ℃ for 4 hours to obtain an intermediate product, crushing the intermediate product, carrying out suction filtration and washing again, drying the washed intermediate product at 120 ℃ for 4 hours, and carrying out jet milling to obtain a modifier; wherein the catalyst is phosphotungstic acid.
Preparing an enhancing agent:
(1) Adjusting the pH value of 200ml of dimethylacetamide to 10 by using a sodium methoxide solution with the mass fraction of 20%, then adding 12.36g of the prepared modifier and 32.14g of paraformaldehyde, mixing, and stirring and reacting at 95 ℃ for 40min to obtain a colorless and transparent hydroxymethyl modifier solution;
(2) Regulating the pH value of the hydroxymethyl modifier solution prepared in the step (1) to 5 by using toluenesulfonic acid, adding 0.5g of 1H,2H and 2H-tridecafluoro-1-octanol, heating to 90 ℃, stirring for reacting for 40min, regulating the pH value of a system to 8 by using triethylamine after the reaction is finished to obtain modified resin, adding the modified resin into 300ml of methanol, and fully and uniformly stirring to obtain a reinforcing reagent;
treating the newly prepared papermaking felt:
s1, soaking a newly prepared felt into a sodium hydroxide solution with the mass concentration of 3%, taking out the papermaking felt after soaking for 4 hours, performing spray washing on the papermaking felt by using clean water at a setting machine, and washing out alkali liquor remained on the surface of the papermaking felt to obtain a clean papermaking felt;
s2, drying the washed clean papermaking felt in a dryer at 50 ℃, soaking the cleaned papermaking felt in the prepared reinforcing reagent after drying for 20min, taking out the soaked clean papermaking felt after soaking for 6h, drying the cleaned papermaking felt again by the dryer, drying the cleaned papermaking felt for 20min at 50 ℃ to enable the surface of the cleaned papermaking felt to be attached with a reinforcing reagent layer, performing needle punching treatment on the cleaned papermaking felt after drying again, and performing heat setting to obtain the high-starting-performance papermaking felt.
Example 2
Preparing a modifier:
adding 12.63g of melamine into 5L of deionized water, stirring and dissolving at 90 ℃ to obtain a melamine aqueous solution, adding 11.37g of phosphoric acid into the melamine aqueous solution, reacting at 95 ℃ for 1 hour, adding 0.16g of a catalyst, continuing to react for 3 hours to obtain a reaction solution, cooling the reaction solution to room temperature, carrying out suction filtration on the reaction solution, washing with deionized water, drying at 120 ℃ for 4 hours to obtain an intermediate product, crushing the intermediate product, carrying out suction filtration again, washing, drying at 120 ℃ for 4 hours to obtain the washed intermediate product, and carrying out air flow crushing to obtain the modifier; wherein the catalyst is phosphotungstic acid.
Preparing an enhancing agent:
(1) Adjusting the pH value of 300ml of dimethylacetamide to 9 by using a sodium methoxide solution with the mass fraction of 20%, then adding 12.83g of the prepared modifier and 35.92g of paraformaldehyde, mixing, and stirring and reacting at 85 ℃ for 60min to obtain a colorless and transparent hydroxymethyl modifier solution;
(2) Adjusting the pH value of the hydroxymethyl modifier solution prepared in the step (1) to 6 by using toluenesulfonic acid, adding 0.25g of 1H,2H and 2H-tridecafluoro-1-octanol, heating to 90 ℃, stirring for reacting for 40min, adjusting the pH value of a system to 8 by using triethylamine after the reaction is finished to obtain modified resin, adding the modified resin into 320ml of methanol, and fully and uniformly stirring to obtain an enhanced reagent;
treating the newly prepared papermaking felt:
s1, soaking a newly prepared felt into a sodium hydroxide solution with the mass concentration of 5%, taking out the papermaking felt after soaking for 2 hours, performing spray washing on the papermaking felt by using clean water at a setting machine, and washing out alkali liquor remained on the surface of the papermaking felt to obtain a clean papermaking felt;
and S3, drying the washed clean papermaking felt in a dryer at 60 ℃, soaking the cleaned papermaking felt in the prepared reinforcing reagent after drying for 15min, taking out the soaked clean papermaking felt after soaking for 8h, drying the cleaned papermaking felt again by the dryer, drying the cleaned papermaking felt for 15min at 60 ℃ to enable the surface of the cleaned papermaking felt to be attached with a reinforcing reagent layer, carrying out needle punching treatment on the cleaned papermaking felt after drying again, and carrying out heat setting to obtain the high-starting-performance papermaking felt.
Example 3
Preparing a modifier:
adding 12.22g of melamine into 5L of deionized water, stirring and dissolving at 90 ℃ to obtain a melamine aqueous solution, adding 9.78g of phosphoric acid into the melamine aqueous solution, reacting at 90 ℃ for 2 hours, adding 0.14g of a catalyst, continuing to react for 3 hours to obtain a reaction solution, cooling the reaction solution to room temperature, carrying out suction filtration on the reaction solution, washing with deionized water, drying at 120 ℃ for 4 hours to obtain an intermediate product, crushing the intermediate product, carrying out suction filtration and washing again, drying the washed intermediate product at 120 ℃ for 4 hours, and carrying out jet milling to obtain a modifier; wherein the catalyst is phosphotungstic acid.
Preparing an enhancing agent:
(1) Adjusting the pH value of 250ml of dimethylacetamide to 9.5 by using a sodium methoxide solution with the mass fraction of 20%, then adding 12.6g of the prepared modifier and 34.02g of paraformaldehyde, mixing, and stirring and reacting at 90 ℃ for 50min to obtain a colorless and transparent hydroxymethyl modifier solution;
(2) Regulating the pH value of the hydroxymethyl modifier solution prepared in the step (1) to 5.5 by using toluenesulfonic acid, adding 0.38g of 1H,2H and 2H-tridecafluoro-1-octanol, heating to 90 ℃, stirring for reaction for 40min, regulating the pH value of a system to 8 by using triethylamine after the reaction is finished to obtain modified resin, adding the modified resin into 310ml of methanol, and fully and uniformly stirring to obtain a reinforcing reagent;
treating the newly prepared papermaking felt:
s1, soaking a newly prepared felt into a sodium hydroxide solution with the mass concentration of 4%, taking out the papermaking felt after soaking for 3 hours, performing spray washing on the papermaking felt by using clean water at a setting machine, and washing out alkali liquor remained on the surface of the papermaking felt to obtain a clean papermaking felt;
s2, performing spray washing on the papermaking felt soaked in the step S1 at a setting machine by using clean water, and washing out alkali liquor remained on the surface of the papermaking felt;
s2, drying the washed clean papermaking felt in a dryer at 55 ℃, soaking the cleaned papermaking felt in the prepared reinforcing reagent after drying for 17min, taking out the soaked clean papermaking felt after soaking for 7h, drying the cleaned papermaking felt again by the dryer, drying the cleaned papermaking felt for 17min at 55 ℃, attaching a reinforcing reagent layer to the surface of the cleaned papermaking felt, performing needle punching treatment on the cleaned papermaking felt after drying again, and performing heat setting to obtain the high-starting-performance papermaking felt.
Example 4
Example 4 is based on example 3, the only difference between example 4 and example 3 being: in preparing the modifier in example 4, 15.71g of melamine was weighed and 6.29g of phosphoric acid was weighed.
Example 5
Example 5 is based on example 3, and the only difference between example 5 and example 3 is that: in the preparation of the modifier in example 5, 10g of melamine was weighed and 12g of phosphoric acid was weighed.
Example 6
Example 6 is based on example 3, and the only difference between example 6 and example 3 is that: in example 6, the reinforcing agent was prepared by weighing 16.61g of the modifier, 29.89g of paraformaldehyde and 0.5g of 1H, 2H-tridecafluoro-1-octanol.
Example 7
Example 7 is based on example 3, and the only difference between example 7 and example 3 is that: in example 7, the reinforcing agent was prepared by weighing 10.15g of the modifier, 36.54g of paraformaldehyde and 0.31g of 1H, 2H-tridecafluoro-1-octanol.
Example 8
Example 8 is based on example 3, and example 8 differs from example 3 only in that: in example 8, 12.67g of the modifier, 34.2g of paraformaldehyde, and 0.13g of 1H, 2H-tridecafluoro-1-octanol were weighed.
Example 9
Example 9 is based on example 3, the only difference between example 9 and example 3 being: in example 9, the reinforcing agent was prepared by weighing 12.47g of the modifier, 33.66g of paraformaldehyde and 0.87g of 1H, 2H-tridecafluoro-1-octanol.
Comparative example 1
Comparative example 1 is based on example 3, the only difference between comparative example 1 and example 3 being: in comparative example 1 phosphotungstic acid was replaced by silicotungstic acid.
Comparative example 2
Comparative example 2 is based on example 3, the only difference between comparative example 2 and example 3 being: the modifier was prepared in comparative example 2 with 22g of melamine weighed and 0g of phosphoric acid weighed.
Comparative example 3
Comparative example 3 is based on example 3, which differs from example 3 only in that: comparative example 3 in preparing the reinforcing agent, 12.7g of the modifier was weighed, 34.3g of paraformaldehyde was weighed, and 0g of 1H, 2H-tridecafluoro-1-octanol was weighed.
Performance test
Test for testing performance of papermaking felt
The papermaker's felts of examples 1-9, comparative examples 1-4 were sampled and tested for the following properties:
(1) Mechanical property detection
Taking FZ _ T25002-2012 paper making felt test method as a standard, manufacturing each sample into a test piece of 100mm multiplied by 50mm, manufacturing each sample into three samples, carrying out a tensile strength detection test, averaging detection results, and filling the detection results into a table 1;
(2) Flame retardant property test
With FZ _ T25002-2012 test method for papermaking felt as a standard, a test piece with the thickness of 100mm multiplied by 1000mm multiplied by 50mm is manufactured for each sample, three test pieces are manufactured for each sample, a combustion test is performed, the oxygen index of each sample is measured, an average value is taken, and the detection results are filled in a table 1.
(3) Oil contamination resistance detection test
Dripping oil drops (the diameter of the oil drops is 5mm, and the volume of the oil drops is 0.05 ml) on the surface of each sample, detecting the state of the oil drops permeating into the sample, wherein the oil drops are excellent when the volume change of the oil drops is between 0.048 and 0.05, good when the volume change of the oil drops is between 0.042 and 0.048, poor when the volume change of the oil drops is between 0.03 and 0.042, and poor when the volume change of the oil drops is below 0.03.
TABLE 1
Performance detection analysis
As can be seen from Table 1, the tensile strengths of examples 1-3 are all above 4.0MPa, so that the papermaking felts prepared by the examples of the present application have good mechanical strength; the burning time of the embodiments 1-3 is below 1.0s, and the damage length is below 80mm, so that the papermaking felt prepared by the method has good flame retardant new performance; the oil repellency of examples 1-3 was excellent, and it can be seen that the papermaker's felt prepared by the present application had good oil repellency.
As can be seen from table 1, the only difference between example 4 and example 3 is that: example 4 differs from example 3 only in that: the modifier prepared in example 3 comprises 12.22g of weighed melamine, 9.78g of phosphoric acid, the modifier prepared in example 4 comprises 15.71g of weighed melamine, 6.29g of weighed phosphoric acid, the burning time of example 3 is 0.5s, the damage length is 59mm, the burning time of example 4 is 2.1s, and the damage length is 134mm, because the phosphorus content in the modifier is reduced after the proportion of the phosphoric acid is reduced, and a phosphorus-carbon expanded heat insulation layer formed on the surface of a papermaking felt is thinned after the papermaking felt is burnt, and the degree of densification is reduced, so that the flame retardance of the papermaking felt in example 4 is reduced.
As can be seen from table 1, the only difference between example 5 and example 3 is that: example 5 the tensile properties of the papermaker's felt prepared in example 5 were reduced, possibly because the thermal stability of the whole system was reduced after the addition of phosphoric acid was excessive, and the mechanical strength of example 5 was reduced, as compared with example 3, in which 10g of melamine was weighed, 12g of phosphoric acid was weighed, and the tensile strength of example 5 was reduced.
As can be seen from table 1, the only difference between example 6 and example 3 is that: example 3 in the preparation of the reinforcing agent, 12.6g of the modifier was weighed, 34.02g of paraformaldehyde, 0.38g of 1H, 2H-tridecafluoro-1-octanol was weighed, 16.61g of the modifier was weighed, 29.89g of paraformaldehyde, 0.5g of 1H, 2H-tridecafluoro-1-octanol was weighed, and 3.1MPa of tensile strength was measured in example 6 and was lower than that in example 3 because the proportion of paraformaldehyde was decreased, the proportion of melamine was increased, the amount of free amino groups in the reinforcing agent was too large, and the stability of the whole reinforcing agent was decreased, so that the degree of improvement of mechanical properties of the felt was low, and the tensile strength of the felt of example 6 was decreased.
The oil repellency of example 6 was good and the oil repellency rating was reduced compared to example 3 because the stability of the reinforcing agent was reduced and fluorine incorporated into the system was less likely to migrate to the surface of the reinforcing agent, and thus the oil repellency of example 6 was reduced and the oil repellency rating was good.
As can be seen from table 1, the only difference between example 7 and example 3 is that: in example 7, when preparing the reinforcing agent, 10.15g of the modifier was weighed, 36.54g of paraformaldehyde was weighed, 0.31g of 1H, 2H-tridecafluoro-1-octanol was weighed, and the tensile strength of example 7 was 3.0MPa, which was lower than that of example 3 because the melamine content was decreased due to an excessive amount of paraformaldehyde, and the excessive methylol group was hard to be bonded to all the amino groups, so that the methylol group content was decreased, the stability of the reinforcing agent was decreased, the mechanical properties of the felt were improved to a lesser extent, and the tensile strength of example 7 was decreased.
As can be seen from table 1, the only difference between example 8 and example 3 is that: example 8 in the production of the reinforcing agent, 12.67g of the modifier was weighed, 34.2g of paraformaldehyde was weighed, 0.13g of 1H, 2H-tridecafluoro-1-octanol was weighed, and the tensile strength of example 8 was 3.1MPa, which was lower than that of example 3 because the C-F bond in the organofluorine compound had excellent stability, and when the content of 1H, 2H-tridecafluoro-1-octanol in the system was too small, the stability of the system was lowered, so that the mechanical properties of the reinforcing agent were lowered, the degree of improvement of the mechanical properties of the papermaking felt of example 8 was weak, and the tensile strength of the papermaking felt of example 8 was lowered.
The oil repellency of example 8 was inferior and was reduced compared with that of example 3, because the amount of 1H, 2H-tridecafluoro-1-octanol in example 8 was too low, the trifluoromethyl group migrating on the surface of the reinforcing agent was reduced, the oil repellency was reduced, and the anti-fouling ability of example 8 was reduced.
As can be seen from table 1, the only difference between example 9 and example 3 is that: example 3 in the preparation of the reinforcing agent, 12.47g of the modifier was weighed, 33.66g of paraformaldehyde was weighed, 0.87g of 1H, 2H-tridecafluoro-1-octanol was weighed, and the tensile strength in example 9 was 3.3MPa, and the tensile strength in example 9 was decreased because the amount of 1H, 2H-tridecafluoro-1-octanol added was too large, too much unreacted 1H, 2H-tridecafluoro-1-octanol occurs and a delamination phenomenon occurs with the reinforcing agent, floating on the surface of the reinforcing agent, so that the stability of the reinforcing agent is lowered and thus the performance of the papermaking felt prepared in example 9 is lowered.
The felt of example 9 had a burn time of 3.4s and a damaged length of 185mm, and the flame retardant performance was lowered as compared with that of example 3, because too much 1H, 2H-tridecafluoro-1-octanol was released on the surface of the reinforcing agent and phosphorus in the system was blocked, so that the time for forming a phosphorus-carbon intumescent insulation layer on the surface of the felt was prolonged, and thus the flame retardant performance of the felt prepared in example 9 was lowered.
As can be seen from table 1, comparative example 1 differs from example 3 only in that: in comparative example 1, phosphotungstic acid is replaced by silicotungstic acid, the tensile strength of comparative example 1 is 2.6MPa, and is reduced compared with example 3, because the thermal stability of silicotungstic acid is inferior to that of phosphotungstic acid, so when silicotungstic acid is used as a catalyst, the stability of a reinforcing reagent system is reduced, and therefore, the papermaking felt treated by the reinforcing reagent in comparative example 1 has poor modification effect on the mechanical properties, and the tensile strength of comparative example 1 is reduced.
As can be seen from table 1, comparative example 2 differs from example 3 only in that: the modifier is prepared in the comparative example 2, 22g of melamine is weighed, 0g of phosphoric acid is weighed, the burning time of the comparative example 2 is 5.2s, the damage length is 245mm, and the flame retardant property is reduced, because the melamine is not modified by using the phosphoric acid, and only the melamine is decomposed and absorbs heat to generate non-combustible gas, so that the combustible is diluted to achieve the flame retardant effect, compared with the example 3, the flame retardant property of the papermaking felt treated in the comparative example 2 is reduced to some extent by using the phosphoric acid for synergetic flame retardant, so that the flame retardant effect of the comparative example 2 is weakened.
As can be seen from table 1, comparative example 3 differs from example 3 only in that: the reinforcing agent prepared in comparative example 3, in which 12.7g of the modifier, 34.3g of paraformaldehyde, 0g of 1H, 2H-tridecafluoro-1-octanol and 2.2MPa of tensile strength in comparative example 3 were weighed, was reduced as compared with example 3 because the reinforcing agent in comparative example 3 had no C-F bond and its chemical stability and mechanical strength were reduced, and thus the mechanical properties of comparative example 3 were reduced.
The oil repellency rating of comparative example 3 was poor because, without the fluorochemical, the reinforcing agent had difficulty in imparting excellent oil repellency to the treated papermaker's felt, and thus comparative example 3 had poor oil repellency.
The present embodiment is merely illustrative and not restrictive, and various changes and modifications may be made by persons skilled in the art without departing from the scope of the present invention as defined in the appended claims. The technical scope of the present application is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (9)
1. A method of improving the initial performance of a papermaking felt, comprising: the method comprises the following steps:
s1, soaking a newly prepared papermaking felt in alkali liquor for 2-4 hours, taking out the papermaking felt, washing with a washing reagent, and cleaning residual alkali liquor to obtain a clean papermaking felt;
s2, drying the clean papermaking felt obtained in the step S1, then soaking the clean papermaking felt in a reinforcing reagent for 6-8 hours, taking out the soaked clean papermaking felt, drying the clean papermaking felt again to enable a reinforcing reagent layer to be attached to the surface of the clean papermaking felt, then shaping, and obtaining the high-starting-performance papermaking felt after shaping;
in the step S2, raw materials of the enhancing reagent comprise a modifier, paraformaldehyde, dimethylacetamide, methanol and 1H, 2H-tridecafluoro-1-octanol.
2. The method of improving the starting performance of a papermaker's felt according to claim 1, wherein: the enhancing reagent is prepared by adopting the following method:
(1) Adjusting the pH value of dimethyl acetamide to 9-10, then mixing with a modifier and paraformaldehyde, and stirring and reacting at 85-95 ℃ for 40-60min to obtain a colorless and transparent hydroxymethyl modifier solution;
(2) Adjusting the pH value of the hydroxymethyl modifier prepared in the step (1) to be acidic, adding 1H, 2H-tridecafluoro-1-octanol, heating, stirring for reacting for 40min, adjusting the pH value of a system to be 8 after reacting to obtain modified resin, and dissolving the modified resin in methanol to obtain the reinforcing reagent.
3. The method of improving the starting performance of a papermaker's felt according to claim 2, wherein: the pH value adjusting range of the hydroxymethyl modifier which is adjusted to be acidic in the step S2 is 5.5-6.5, and the temperature rise temperature is 85-95 ℃.
4. The method of improving the starting performance of a papermaker's felt according to claim 1, wherein: the mass ratio of the modifier to the paraformaldehyde to the 1H,2H and 2H-tridecafluoro-1-octanol is 1 (2.6-2.8) to 0.02-0.04.
5. The method of enhancing a papermaker's felt starting performance according to claim 1, wherein: the raw materials of the modifier comprise melamine, phosphoric acid and a catalyst.
6. The method of improving the starting performance of a papermaker's felt according to claim 5, wherein: the mass ratio of the melamine to the phosphoric acid is 1 (0.7-0.9).
7. The method of improving the starting performance of a papermaker's felt according to claim 5, wherein: the modifier is prepared by adopting the following method:
dissolving melamine to obtain a melamine aqueous solution, adding phosphoric acid into the melamine aqueous solution, reacting for 2 hours, adding a catalyst, continuing to react to obtain a reaction solution, cooling to room temperature, carrying out suction filtration and washing on the reaction solution, drying for 4 hours to obtain an intermediate product, crushing the intermediate product, carrying out suction filtration and washing again, drying the washed intermediate product again, and carrying out jet milling to obtain the modifier.
8. The method of improving the starting performance of a papermaker's felt according to claim 5, wherein: the catalyst is phosphotungstic acid.
9. The method of enhancing a papermaker's felt starting performance according to claim 1, wherein: the alkali liquor in the step S1 is a sodium hydroxide solution with the mass concentration of 3-5%, and the cleaning reagent in the step S2 is clear water.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1763307A (en) * | 2004-10-19 | 2006-04-26 | 上海金熊造纸网毯有限公司 | Method for manufacturing antifouling Batt-on-mesh press felt |
| CN101709545A (en) * | 2009-12-15 | 2010-05-19 | 宁波艾利特服饰有限公司 | Finishing method for textile fabrics |
| CN102587024A (en) * | 2012-01-11 | 2012-07-18 | 临沂绿因工贸有限公司 | Flame-retardant blanket and preparation process for same |
| CN111893691A (en) * | 2020-08-19 | 2020-11-06 | 苏州优莱特种织物新科技有限公司 | Papermaking felt shaping process |
-
2022
- 2022-12-10 CN CN202211580817.1A patent/CN115821571A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1763307A (en) * | 2004-10-19 | 2006-04-26 | 上海金熊造纸网毯有限公司 | Method for manufacturing antifouling Batt-on-mesh press felt |
| CN101709545A (en) * | 2009-12-15 | 2010-05-19 | 宁波艾利特服饰有限公司 | Finishing method for textile fabrics |
| CN102587024A (en) * | 2012-01-11 | 2012-07-18 | 临沂绿因工贸有限公司 | Flame-retardant blanket and preparation process for same |
| CN111893691A (en) * | 2020-08-19 | 2020-11-06 | 苏州优莱特种织物新科技有限公司 | Papermaking felt shaping process |
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Application publication date: 20230321 |