CN116219801A - Method for enhancing pulp molding property and application thereof - Google Patents
Method for enhancing pulp molding property and application thereof Download PDFInfo
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- CN116219801A CN116219801A CN202310035767.7A CN202310035767A CN116219801A CN 116219801 A CN116219801 A CN 116219801A CN 202310035767 A CN202310035767 A CN 202310035767A CN 116219801 A CN116219801 A CN 116219801A
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- citric acid
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- fiber
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- 238000000465 moulding Methods 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 40
- 230000002708 enhancing effect Effects 0.000 title claims abstract description 21
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 132
- 239000000835 fiber Substances 0.000 claims abstract description 126
- 239000002002 slurry Substances 0.000 claims abstract description 61
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000003377 acid catalyst Substances 0.000 claims abstract description 37
- 238000002156 mixing Methods 0.000 claims abstract description 36
- 238000002791 soaking Methods 0.000 claims abstract description 35
- 239000011259 mixed solution Substances 0.000 claims abstract description 33
- 239000003054 catalyst Substances 0.000 claims abstract description 22
- 210000001161 mammalian embryo Anatomy 0.000 claims abstract description 22
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 20
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 12
- 239000000123 paper Substances 0.000 claims description 62
- 239000000725 suspension Substances 0.000 claims description 53
- 241000196324 Embryophyta Species 0.000 claims description 22
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 15
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 15
- 241001330002 Bambuseae Species 0.000 claims description 15
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 15
- 239000011425 bamboo Substances 0.000 claims description 15
- 240000000111 Saccharum officinarum Species 0.000 claims description 13
- 235000007201 Saccharum officinarum Nutrition 0.000 claims description 13
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 claims description 11
- KRKNYBCHXYNGOX-UHFFFAOYSA-K Citrate Chemical compound [O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O KRKNYBCHXYNGOX-UHFFFAOYSA-K 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- IYDGMDWEHDFVQI-UHFFFAOYSA-N phosphoric acid;trioxotungsten Chemical compound 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 8
- 239000000203 mixture Substances 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 3
- 239000010902 straw Substances 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 229920002678 cellulose Polymers 0.000 abstract description 18
- 239000001913 cellulose Substances 0.000 abstract description 18
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 238000004132 cross linking Methods 0.000 abstract description 5
- 238000004513 sizing Methods 0.000 abstract description 5
- 239000003208 petroleum Substances 0.000 abstract description 4
- 239000003431 cross linking reagent Substances 0.000 abstract description 3
- 239000008104 plant cellulose Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 29
- 238000010438 heat treatment Methods 0.000 description 25
- 229920002472 Starch Polymers 0.000 description 24
- 125000002091 cationic group Chemical group 0.000 description 24
- 239000008107 starch Substances 0.000 description 24
- 235000019698 starch Nutrition 0.000 description 24
- 229920002401 polyacrylamide Polymers 0.000 description 22
- 238000003860 storage Methods 0.000 description 14
- 238000000227 grinding Methods 0.000 description 9
- 238000007865 diluting Methods 0.000 description 7
- 150000002500 ions Chemical class 0.000 description 7
- 239000004745 nonwoven fabric Substances 0.000 description 7
- 238000004537 pulping Methods 0.000 description 7
- 238000009966 trimming Methods 0.000 description 7
- -1 polybutylene succinate Polymers 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- NCPXQVVMIXIKTN-UHFFFAOYSA-N trisodium;phosphite Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])[O-] NCPXQVVMIXIKTN-UHFFFAOYSA-N 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000005871 repellent Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 239000001509 sodium citrate Substances 0.000 description 3
- HRXKRNGNAMMEHJ-UHFFFAOYSA-K trisodium citrate Chemical compound [Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O HRXKRNGNAMMEHJ-UHFFFAOYSA-K 0.000 description 3
- 229940038773 trisodium citrate Drugs 0.000 description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002939 oilproofing Substances 0.000 description 2
- 239000011087 paperboard Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VOWAEIGWURALJQ-UHFFFAOYSA-N Dicyclohexyl phthalate Chemical compound C=1C=CC=C(C(=O)OC2CCCCC2)C=1C(=O)OC1CCCCC1 VOWAEIGWURALJQ-UHFFFAOYSA-N 0.000 description 1
- 101001136034 Homo sapiens Phosphoribosylformylglycinamidine synthase Proteins 0.000 description 1
- 229920000881 Modified starch Polymers 0.000 description 1
- 239000004368 Modified starch Substances 0.000 description 1
- 150000005857 PFAS Chemical class 0.000 description 1
- 102100036473 Phosphoribosylformylglycinamidine synthase Human genes 0.000 description 1
- 239000005819 Potassium phosphonate Substances 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 239000002671 adjuvant Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011111 cardboard Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- YXXXKCDYKKSZHL-UHFFFAOYSA-M dipotassium;dioxido(oxo)phosphanium Chemical compound [K+].[K+].[O-][P+]([O-])=O YXXXKCDYKKSZHL-UHFFFAOYSA-M 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005886 esterification reaction Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 235000019426 modified starch Nutrition 0.000 description 1
- 238000010534 nucleophilic substitution reaction Methods 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000011846 petroleum-based material Substances 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920002961 polybutylene succinate Polymers 0.000 description 1
- 239000004631 polybutylene succinate Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000001508 potassium citrate Substances 0.000 description 1
- QEEAPRPFLLJWCF-UHFFFAOYSA-K potassium citrate (anhydrous) Chemical compound [K+].[K+].[K+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O QEEAPRPFLLJWCF-UHFFFAOYSA-K 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011973 solid acid Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 235000015870 tripotassium citrate Nutrition 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
- D21J3/00—Manufacture of articles by pressing wet fibre pulp, or papier-mâché, between moulds
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Paper (AREA)
Abstract
The invention belongs to the technical field of paper production, and discloses a method for enhancing the molding property of paper pulp and application thereof. The method comprises three modes: (1) Mixing the slurry with a citric acid-catalyst mixed solution, and performing slurry suction and hot press molding to obtain the catalyst; (2) Soaking wet embryo paper products by using a citric acid-catalyst mixed solution; then hot-press molding is carried out to obtain the product; (3) The citric acid-catalyst mixed solution is adopted to soak the dry paper product, and then the paper product is prepared by hot press molding. According to the invention, plant fibers are used as a main body of a pulp molding product, citric acid is used as a cross-linking agent, and a catalyst is used, so that the citric acid is reserved among plant cellulose in the modes of internal sizing, wet film soaking, dry film soaking and the like, and the citric acid and the cellulose undergo a cross-linking reaction under high temperature and high pressure conditions, so that the strength, the water and oil resistance of the pulp molding product can be improved under the condition that petroleum-based water and oil resistance auxiliary agents are not used.
Description
Technical Field
The invention belongs to the technical field of paper production, and particularly relates to a method for enhancing the molding property of paper pulp and application thereof.
Background
The pulp molding product is a packaging product which is formed by taking plant fiber as a raw material and molding through a certain molding process. The pulp molding product has the advantages of simple processing technology, easy molding, degradable and recyclable material and the like, and is widely applied to various fields. In order to achieve the water and oil proofing effect of the pulp molding product, a common method is to add a water and oil proofing agent in the pulp molding preparation process. The most widely used oil-repellent agents at present are fluorine-containing oil-repellent agents, but fluorine-containing oil-repellent agents belong to the class of PFAS (polyfluoroalkyl substances), called permanent compounds, belonging to substances harmful to the human body and the environment. The development of fluorine-free water-and oil-repellent adjuvants is therefore an important research direction in the pulp molding industry.
In the technical scheme in the prior art, polymer emulsion with a hydrophobic structure is mostly adopted for carrying out the interaction to obtain the waterproof and oil-proof auxiliary agent. If the butyl acrylate polymer, the modified starch and the wax emulsion are used for matching to obtain an oil-proof auxiliary agent; pulp molding is prepared by using nano titanium dioxide, polybutylene succinate, dicyclohexyl phthalate, stearic acid and a wet strength agent for internal sizing. However, most of these water-proof and oil-proof assistants are petroleum-based materials, and it is imperative to adopt natural biomass materials in the current environment of green and low carbon. In addition, pulp molding using plant fibers as a raw material is required to further improve the strength such as compressive strength, burst index.
Accordingly, there is a need to provide a method for enhancing the molding properties of pulp, which can improve the strength and water and oil repellency of pulp molded articles without using petroleum-based water and oil repellency aids.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the prior art described above. To this end, the invention proposes a method for enhancing the moulding properties of pulp and its use. The method provided by the invention can improve the strength and the water and oil resistance of the pulp molding product under the condition of not using petroleum-based water and oil resistance auxiliary agent.
In a first aspect the invention provides a method of enhancing pulp moulding properties.
Specifically, a method for enhancing the molding property of paper pulp is selected from one of the following three modes:
(1) Preparing plant fibers into fiber suspension, fluffing, and adding papermaking auxiliary agents to obtain slurry; mixing citric acid with a catalyst, and adding water to prepare a citric acid-catalyst mixed solution; mixing the slurry with the citric acid-catalyst mixed solution, stirring, absorbing slurry to obtain wet embryo paper products, and performing hot press molding on the wet embryo paper products to obtain pulp molded products; or (b)
(2) Preparing plant fibers into fiber suspension, fluffing, and adding papermaking auxiliary agents to obtain slurry; then the slurry is absorbed to prepare wet embryo paper products; mixing citric acid with a catalyst, and adding water to prepare a citric acid-catalyst mixed solution; soaking the wet embryonic paper product by using the citric acid-catalyst mixed solution, and performing hot press molding to obtain a pulp molding product; or (b)
(3) Preparing plant fibers into fiber suspension, fluffing, and adding papermaking auxiliary agents to obtain slurry; then the slurry is subjected to slurry absorption and hot press molding to prepare dry paper products; mixing citric acid with a catalyst, and adding water to prepare a citric acid-catalyst mixed solution; soaking the dry paper product at least once by using the citric acid-catalyst mixed solution, and performing hot press molding again to obtain a pulp molding product;
in the modes (1) to (3), the catalyst is selected from at least one of soluble phosphite, phosphotungstic acid and soluble citrate.
Preferably, the soluble phosphite may be sodium phosphite, potassium phosphite, or the like; the soluble citrate may be selected from trisodium citrate, tripotassium citrate, and the like.
Preferably, when the catalyst selects soluble phosphite, the mass ratio of citric acid to phosphite is (1-5): 1; it is further preferred that when the catalyst selects a soluble phosphite, the mass ratio of citric acid to phosphite is (2-3): 1.
Preferably, when the catalyst selects phosphotungstic acid, the mass ratio of the citric acid to the phosphotungstic acid is (20-30): 1.
Preferably, when the catalyst selects soluble citrate, the mass ratio of the citric acid to soluble citrate is (0.5-3): 1; it is further preferred that when the catalyst selects soluble citrate, the mass ratio of the citric acid to soluble citrate is (1-2): 1.
Preferably, in the modes (1) to (3), the mass content of the citric acid in the citric acid-catalyst mixed solution is 5% to 20%; further preferably, in the modes (1) to (3), the mass content of the citric acid in the citric acid-catalyst mixed solution is 8% to 15%.
Preferably, in the mode (1), the mass ratio of the citric acid in the citric acid-catalyst mixed solution to the plant fiber is 1-2:1.
preferably, in the modes (1) to (3), the plant fiber is selected from at least one of bamboo pulp fiber, wood pulp fiber, pomace fiber, straw fiber, and sugarcane pulp fiber; further preferably, in the modes (1) to (3), the plant fiber is selected from at least three of bamboo pulp fiber, wood pulp fiber, pomace fiber, straw fiber, and cane pulp fiber. When two or more kinds of plant fibers are selected, the plant fibers are mixed in an arbitrary ratio.
More preferably, in the modes (1) to (3), the plant fibers are bamboo pulp fibers, wood pulp fibers and sugarcane pulp fibers. The mass ratio of the bamboo pulp fiber, the wood pulp fiber and the sugarcane pulp fiber can be (1-5) 1: (3-8). The mass ratio of the bamboo pulp fiber, the wood pulp fiber and the sugarcane pulp fiber can be 3:1:5.
preferably, in modes (1) - (3), the mass content of the plant fiber in the fiber suspension is 1% -8%; further preferably, the mass content of plant fibers in the fiber suspension is 2% -5%.
Preferably, in the modes (1) - (3), the fluffing is performed for 20-60min by adopting a fluffer.
Preferably, in the modes (1) to (3), a grinding process of grinding the cellulose suspension to a freeness of 440 to 500mL is further included after the defibering process.
Preferably, in modes (1) - (3), the papermaking auxiliary agent comprises, but is not limited to, cationic starch, polyacrylamide.
Preferably, in the modes (1) - (3), the pulp sucking process is to dilute the pulp first and then suck the pulp under the vacuum degree of 0.04-0.08Mpa to obtain the wet embryo paper product.
Preferably, in the mode (2), the soaking time is 20 to 90min; further preferably, in the step (2), the soaking time is 30-90min; more preferably, in step (2), the soaking time is 60-90min.
Preferably, in the modes (1) - (3), the hot press forming process is to place the wet blank paper product in a hot press forming machine, control the temperature of the upper and lower heating plates to be 150-250 ℃ and perform hot press treatment for 60-120s under the pressure of 5.5-10 Mpa.
Preferably, in mode (3), the dry paper product is soaked at least twice with the citric acid-catalyst mixture; more preferably, in mode (3), the dry paper product is soaked 2-4 times with the citric acid-catalyst mixture. It will be appreciated that when soaking at least twice, each soaking is followed by a drying process and then the next soaking.
Preferably, in the mode (3), the time of each soaking is 30-90min; further preferably, in the mode (3), the time for each soaking is 50 to 90 minutes.
The second aspect of the present invention provides the use of the above method for enhancing the moulding properties of pulp.
In particular, the use of the above method for enhancing pulp moulding properties in the preparation of paper.
In a third aspect, the present invention provides a pulp molded article.
Specifically, a pulp molding product is prepared by the method for enhancing the pulp molding performance. The pulp molding product has a compressive strength of more than 39.0 N.m/g and a burst index of more than 2.50 kPa.m when the thickness is 0.7+/-0.05 2 And/g, the waterproof contact angle is greater than 99.0 degrees.
Preferably, the paperThe pulp molded product has a compressive strength of more than 40.0 N.m/g and a burst index of more than 2.80 kPa.m at a thickness of 0.7 + -0.05 2 /g, the waterproof contact angle is greater than 103.0 degrees; further preferably, the pulp molded article has a compressive strength of greater than 50.0 N.m/g and a burst index of greater than 3.20 kPa.m at a thickness of 0.7.+ -. 0.05 2 And/g, the waterproof contact angle is more than 110.0 degrees.
According to the invention, plant fibers are used as a main body of a pulp molding product, citric acid is used as a cross-linking agent, and the citric acid is reserved between plant cellulose in three modes of internal sizing (mode (1)), wet film soaking (mode (2)), dry film soaking (mode (3)), and is subjected to cross-linking reaction with cellulose under the action of a catalyst (such as soluble phosphite, phosphotungstic acid and soluble citrate) under the condition of high temperature and high pressure, so that the pulp molding strength and the water and oil resistance are improved. Wherein phosphotungstic acid is a common solid acid catalyst capable of catalyzing citric acid and cellulose to generate crosslinking reaction. The soluble phosphite not only can reduce the temperature of the formation of the polybasic cyclic anhydride intermediate and accelerate the formation of the polybasic cyclic anhydride, but also has obvious catalytic effect on nucleophilic substitution reaction of the polybasic cyclic anhydride and cellulose to form ester. Trisodium citrate is used as a catalyst and the principle is as follows: the crosslinking reaction of citric acid and cellulose is divided into two stages, and the specific reaction is as follows: firstly, citric acid is dehydrated to form cyclic anhydride, and then esterification reaction is carried out on the cyclic anhydride and cellulose, so that cellulose molecular chains are bridged mutually, and further the mechanical property, water resistance and oil resistance of pulp molding are improved.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, plant fibers are used as a main body of a pulp molding product, citric acid is used as a cross-linking agent, and a catalyst is used, so that the citric acid is reserved between plant cellulose in the modes of internal sizing, wet film soaking, dry film soaking and the like, and the citric acid and the cellulose undergo a cross-linking reaction under the conditions of high temperature and high pressure (hot press molding process), so that the strength and the water and oil resistance of the pulp molding product can be improved under the condition that petroleum-based water and oil resistance auxiliary agents are not used.
Detailed Description
In order to make the technical solutions of the present invention more apparent to those skilled in the art, the following examples will be presented. It should be noted that the following examples do not limit the scope of the invention.
The starting materials, reagents or apparatus used in the following examples are all available from conventional commercial sources or may be obtained by methods known in the art unless otherwise specified.
Example 1
A method of enhancing pulp molding properties comprising the steps of:
(1) Mixing 30 parts by weight of bamboo pulp fibers, 10 parts by weight of wood pulp fibers and 50 parts by weight of sugarcane pulp fibers, adding water into a dispersing machine, stirring to prepare fiber suspension with fiber content of 2wt%, dispersing, and transferring into a storage barrel for later use;
(2) Fluffing the fiber suspension in the step (1) for 30min by a fluffer, then transferring into a pulping machine for grinding to obtain a pulp suspension with the freeness of 480mL, and transferring into a storage barrel for standby;
(3) Adding 2 parts by weight of cationic starch into water to prepare cationic starch suspension with the concentration of 2wt%, curing at 80 ℃ to obtain cationic starch solution, adding the cationic starch solution into paper pulp suspension in an amount of 2wt% of absolute dry fibers (total absolute dry fiber mass), and mixing for 20min at the rotating speed of 80rpm for standby; then adding 1 part by weight of polyacrylamide (with the molecular weight of 300-800 ten thousand and the ion degree of 20-40) into water slowly to prepare a polyacrylamide solution with the concentration of 1wt%, adding the polyacrylamide solution into the pulp suspension with the dosage of 0.5wt% of absolute dry fibers, and mixing for 30min at the rotating speed of 100rpm to obtain slurry.
(4) Mixing 8 parts by mass of citric acid and 4 parts by mass of sodium phosphite, adding water to prepare a citric acid-catalyst mixed solution with the content of 10%, adding the citric acid-catalyst mixed solution into the slurry in the step (4) according to the mass ratio of the citric acid to the cellulose (absolute dry weight) of 1.5:1, and stirring at the speed of 100rpm for 30min; and then diluting the slurry with water to form slurry with cellulose content of 0.5%, transferring the slurry into a slurry suction tank, and vacuum sucking the slurry into wet embryo paper products in a forming machine by using a die under the condition of vacuum degree of 0.06 Mpa.
(5) Transferring the wet blank paper product obtained in the step (4) into a hot press forming machine, heating the upper and lower heating plates to 200 ℃, carrying out hot press treatment for 90s under the pressure of 7.5Mpa, and trimming to obtain the final pulp molding product.
Example 2
A method of enhancing pulp molding properties comprising the steps of:
(1) Mixing 30 parts by weight of bamboo pulp fibers, 10 parts by weight of wood pulp fibers and 50 parts by weight of sugarcane pulp fibers, adding water into a dispersing machine, stirring to prepare fiber suspension with fiber content of 2wt%, dispersing, and transferring into a storage barrel for later use;
(2) Fluffing the fiber suspension in the step (1) for 30min by a fluffer, then transferring into a pulping machine for grinding to obtain a pulp suspension with the freeness of 480mL, and transferring into a storage barrel for standby;
(3) Adding 2 parts by weight of cationic starch into water to prepare cationic starch suspension with the concentration of 2wt%, curing at 80 ℃ to obtain cationic starch solution, adding the cationic starch solution into paper pulp suspension in an amount of 2wt% of absolute dry fibers (total absolute dry fiber mass), and mixing for 20min at the rotating speed of 80rpm for standby; then slowly adding water into 1 part by weight of polyacrylamide (with the molecular weight of 300-800 ten thousand and the ion degree of 20-40) to prepare a polyacrylamide solution with the concentration of 1wt%, adding the polyacrylamide solution into pulp suspension with the dosage of 0.5wt% of absolute dry fibers, and mixing for 30min at the rotating speed of 100rpm to obtain slurry; and then diluting the slurry with water to form slurry with cellulose content of 0.5wt%, transferring the slurry into a slurry suction tank, and vacuum sucking the slurry into wet embryo paper products in a forming machine by using a die under the condition of vacuum degree of 0.06 Mpa.
(4) Mixing 8 parts by mass of citric acid and 4 parts by mass of sodium phosphite, adding water to prepare a citric acid-catalyst mixed solution with the content of 10wt%, soaking the wet embryo paper product obtained in the step (3) in the citric acid-catalyst mixed solution for 30min, and wiping the surface of the wet embryo paper product with non-woven fabric after soaking.
(5) Transferring the wet blank paper product obtained in the step (4) into a hot press forming machine, heating the upper and lower heating plates to 200 ℃, carrying out hot press treatment for 90s under the pressure of 7.5Mpa, and trimming to obtain the final pulp molding product.
Example 3
A method of enhancing pulp molding properties comprising the steps of:
(1) Mixing 30 parts by weight of bamboo pulp fibers, 10 parts by weight of wood pulp fibers and 50 parts by weight of sugarcane pulp fibers, adding water into a dispersing machine, stirring to prepare fiber suspension with fiber content of 2wt%, dispersing, and transferring into a storage barrel for later use;
(2) Fluffing the fiber suspension in the step (1) for 30min by a fluffer, then transferring into a pulping machine for grinding to obtain a pulp suspension with the freeness of 480mL, and transferring into a storage barrel for standby;
(3) Adding 2 parts by weight of cationic starch into water to prepare a suspension with the concentration of 2wt%, curing at 80 ℃ to obtain cationic starch solution, adding the cationic starch solution into the pulp suspension in an amount of 2wt% of absolute dry fibers (total absolute dry fiber mass), and mixing for 20min at the rotating speed of 80rpm for standby; then slowly adding water into 1 part by weight of polyacrylamide (with the molecular weight of 300-800 ten thousand and the ion degree of 20-40) to prepare a polyacrylamide solution with the concentration of 1wt%, adding the polyacrylamide solution into pulp suspension with the dosage of 0.5wt% of absolute dry fibers, and mixing for 30min at the rotating speed of 100rpm to obtain slurry; and then diluting the slurry with water to form slurry with cellulose content of 0.5wt%, transferring the slurry into a slurry suction tank, and vacuum sucking the slurry into wet embryo paper products in a forming machine by using a die under the condition of vacuum degree of 0.06 Mpa.
(4) Mixing 8 parts by mass of citric acid and 4 parts by mass of sodium phosphite, adding water to prepare a citric acid-catalyst mixed solution with the content of 10wt%, soaking the wet embryo paper product obtained in the step (3) in the citric acid-catalyst mixed solution for 60min, and wiping the surface of the wet embryo paper product with non-woven fabric after soaking.
(5) Transferring the wet blank paper product obtained in the step (4) into a hot press forming machine, heating the upper and lower heating plates to 200 ℃, carrying out hot press treatment for 90s under the pressure of 7.5Mpa, and trimming to obtain the final pulp molding product.
Example 4
A method of enhancing pulp molding properties comprising the steps of:
(1) Mixing 30 parts by weight of bamboo pulp fibers, 10 parts by weight of wood pulp fibers and 50 parts by weight of sugarcane pulp fibers, adding water into a dispersing machine, stirring to prepare fiber suspension with fiber content of 2%, dispersing pulp, and transferring into a storage barrel for later use;
(2) Fluffing the fiber suspension in the step (1) for 30min by a fluffer, then transferring into a pulping machine for grinding to obtain a pulp suspension with the freeness of 480mL, and transferring into a storage barrel for standby;
(3) Adding 2 parts by weight of cationic starch into water to prepare a suspension with the concentration of 2wt%, curing at 80 ℃ to obtain cationic starch solution, adding the cationic starch solution into the pulp suspension in an amount of 2wt% of absolute dry fibers (total absolute dry fiber mass), and mixing for 20min at the rotating speed of 80rpm for standby; then slowly adding water into 1 part by weight of polyacrylamide (with the molecular weight of 300-800 ten thousand and the ion degree of 20-40) to prepare a polyacrylamide solution with the concentration of 1wt%, adding the polyacrylamide solution into pulp suspension with the dosage of 0.5wt% of absolute dry fibers, and mixing for 30min at the rotating speed of 100rpm to obtain slurry; and then diluting the slurry with water to form slurry with cellulose content of 0.5wt%, transferring the slurry into a slurry suction tank, and vacuum sucking the slurry into wet embryo paper products in a forming machine by using a die under the condition of vacuum degree of 0.06 Mpa.
(4) Transferring the wet embryo paper product obtained in the step (3) into a hot press forming machine, heating the upper and lower heating plates to 200 ℃, and carrying out hot press treatment for 90s under the pressure of 7.5Mpa to obtain the dry state paper product.
(5) Mixing 8 parts by mass of citric acid and 4 parts by mass of sodium phosphite, adding water to prepare a citric acid-catalyst mixed solution with the content of 10%, soaking the dry paper product obtained in the step (4) in the citric acid-catalyst mixed solution for 60min, and wiping the surface of the paper product with non-woven fabrics after soaking; then the pulp is moved into a hot press forming machine, the temperature of the upper heating plate and the lower heating plate is heated to 200 ℃, hot press treatment is carried out for 90s under the pressure of 7.5Mpa, and the final pulp molding product is obtained after trimming.
Example 5
A method of enhancing pulp molding properties comprising the steps of:
(1) Mixing 30 parts by weight of bamboo pulp fibers, 10 parts by weight of wood pulp fibers and 50 parts by weight of sugarcane pulp fibers, adding water into a dispersing machine, stirring to prepare fiber suspension with fiber content of 2wt%, dispersing, and transferring into a storage barrel for later use;
(2) Fluffing the fiber suspension in the step (1) for 30min by a fluffer, then transferring into a pulping machine for grinding to obtain a pulp suspension with the freeness of 480mL, and transferring into a storage barrel for standby;
(3) Adding 2 parts by weight of cationic starch into water to prepare a suspension with the concentration of 2wt%, curing at 80 ℃ to obtain cationic starch solution, adding the cationic starch solution into the pulp suspension in an amount of 2wt% of absolute dry fibers (total absolute dry fiber mass), and mixing for 20min at the rotating speed of 80rpm for standby; then slowly adding water into 1 part by weight of polyacrylamide (with the molecular weight of 300-800 ten thousand and the ion degree of 20-40) to prepare a polyacrylamide solution with the concentration of 1wt%, adding the polyacrylamide solution into pulp suspension with the dosage of 0.5wt% of absolute dry fibers, and mixing for 30min at the rotating speed of 100rpm to obtain slurry; and then diluting the slurry with water to form slurry with cellulose content of 0.5wt%, transferring the slurry into a slurry suction tank, and vacuum sucking the slurry into wet embryo paper products in a forming machine by using a die under the condition of vacuum degree of 0.06 Mpa.
(4) Transferring the wet embryo paper product obtained in the step (3) into a hot press forming machine, heating the upper and lower heating plates to 200 ℃, and carrying out hot press treatment for 90s under the pressure of 7.5Mpa to obtain the dry state paper product.
(5) Mixing 8 parts by mass of citric acid and 4 parts by mass of sodium phosphite, adding water to prepare a citric acid-catalyst mixed solution with the content of 10wt%, soaking the dry paper product obtained in the step (4) in the citric acid-catalyst mixed solution for 60min, and wiping the surface of the paper product with a non-woven fabric after soaking; then the paper product is moved into a hot press forming machine, the temperature of the upper heating plate and the lower heating plate is heated to 200 ℃, and the paper product is subjected to hot press treatment for 90s under the pressure of 7.5Mpa, so that the once soaked dry paper product is obtained.
(6) Soaking the dry paper product obtained in the step (5) into the citric acid-catalyst mixed solution (the content is 10wt%) again for 60min, and wiping the surface of the paper product with non-woven fabric after soaking; then the pulp is moved into a hot press forming machine, the temperature of the upper heating plate and the lower heating plate is heated to 200 ℃, hot press treatment is carried out for 90s under the pressure of 7.5Mpa, and the final pulp molding product is obtained after trimming.
Example 6
A method of enhancing pulp molding properties comprising the steps of:
(1) Mixing 30 parts by weight of bamboo pulp fibers, 10 parts by weight of wood pulp fibers and 50 parts by weight of sugarcane pulp fibers, adding water into a dispersing machine, stirring to prepare fiber suspension with fiber content of 2wt%, dispersing, and transferring into a storage barrel for later use;
(2) Fluffing the fiber suspension in the step (1) for 30min by a fluffer, then transferring into a pulping machine for grinding to obtain a pulp suspension with the freeness of 480mL, and transferring into a storage barrel for standby;
(3) Adding 2 parts by weight of cationic starch into water to prepare a suspension with the concentration of 2wt%, curing at 80 ℃ to obtain cationic starch solution, adding the cationic starch solution into the pulp suspension in an amount of 2wt% of absolute dry fibers (total absolute dry fiber mass), and mixing for 20min at the rotating speed of 80rpm for standby; then slowly adding water into 1 part by weight of polyacrylamide (with the molecular weight of 300-800 ten thousand and the ion degree of 20-40) to prepare a polyacrylamide solution with the concentration of 1wt%, adding the polyacrylamide solution into pulp suspension with the dosage of 0.5wt% of absolute dry fibers, and mixing for 30min at the rotating speed of 100rpm to obtain slurry; and then diluting the slurry with water to form slurry with cellulose content of 0.5wt%, transferring the slurry into a slurry suction tank, and vacuum sucking the slurry into wet embryo paper products in a forming machine by using a die under the condition of vacuum degree of 0.06 Mpa.
(4) Transferring the wet embryo paper product obtained in the step (3) into a hot press forming machine, heating the upper and lower heating plates to 200 ℃, and carrying out hot press treatment for 90s under the pressure of 7.5Mpa to obtain the dry state paper product.
(5) Mixing 8 parts by mass of citric acid and 4 parts by mass of trisodium citrate, adding water to prepare a citric acid-catalyst mixed solution with the content of 10wt%, soaking the dry paper product obtained in the step (4) in the citric acid-catalyst mixed solution for 60min, and wiping the surface of the paper product with a non-woven fabric after soaking; then the paper product is moved into a hot press forming machine, the temperature of the upper heating plate and the lower heating plate is heated to 200 ℃, and the paper product is subjected to hot press treatment for 90s under the pressure of 7.5Mpa, so that the once soaked dry paper product is obtained.
(6) Soaking the dry paper product obtained in the step (5) into the citric acid-catalyst mixed solution (the content is 10wt%) again for 60min, and wiping the surface of the paper product with non-woven fabric after soaking; then the pulp is moved into a hot press forming machine, the temperature of the upper heating plate and the lower heating plate is heated to 200 ℃, hot press treatment is carried out for 90s under the pressure of 7.5Mpa, and the final pulp molding product is obtained after trimming.
Comparative example 1
A method of enhancing pulp molding properties comprising the steps of:
(1) Mixing 30 parts by weight of bamboo pulp fibers, 10 parts by weight of wood pulp fibers and 50 parts by weight of sugarcane pulp fibers, adding water into a dispersing machine, stirring to prepare fiber suspension with fiber content of 2wt%, dispersing, and transferring into a storage barrel for later use;
(2) Fluffing the fiber suspension in the step (1) for 30min by a fluffer, then transferring into a pulping machine for grinding to obtain a pulp suspension with the freeness of 480mL, and transferring into a storage barrel for standby;
(3) Adding 2 parts by weight of cationic starch into water to prepare a suspension with the concentration of 2wt%, curing at 80 ℃ to obtain cationic starch solution, adding the cationic starch solution into the pulp suspension in an amount of 2wt% of absolute dry fibers (total absolute dry mass of fibers), and mixing for 20min at a rotating speed of 80rpm for standby; then slowly adding water into 1 part by weight of polyacrylamide (with the molecular weight of 300-800 ten thousand and the ion degree of 20-40) to prepare a polyacrylamide solution with the concentration of 1wt%, adding the polyacrylamide solution into pulp suspension with the dosage of 0.5wt% of absolute dry fibers, and mixing for 30min at the rotating speed of 100rpm to obtain slurry; and then diluting the slurry with water to form slurry with cellulose content of 0.5wt%, transferring the slurry into a slurry suction tank, and vacuum sucking the slurry into wet embryo paper products in a forming machine by using a die under the condition of vacuum degree of 0.06 Mpa.
(4) Transferring the wet blank paper product obtained in the step (3) into a hot press forming machine, heating the upper and lower heating plates to 200 ℃, carrying out hot press treatment for 90s under the pressure of 7.5Mpa to obtain a dry paper product, and trimming to obtain a final pulp molding product.
Product effect test
The pulp molded articles prepared in examples 1 to 6 and comparative example 1 were subjected to test performance tests, and the main test items include compressive strength, burst index, water resistance/contact angle and oil resistance. Wherein the compression strength is tested with reference to GB/T12914-2008 "determination of tensile Strength of paper and cardboard"; the burst index is tested by referring to GB/T454-2002 paper burst test; waterproof properties/contact angles were measured using a video optical contact angle meter; oil repellency reference GB/T22805.2-2008 "determination of paper and paperboard resistance to greasiness part 2: the surface repellency method was tested, i.e., the "KIT TEST" method. The test results are shown in Table 1.
TABLE 1
As is clear from Table 1, the pulp molded articles obtained by treating the pulp or the wet and dry paper products with citric acid in examples 1 to 6 are significantly superior to comparative example 1 in compressive strength, burst index and water and oil resistance. Comparing examples 2-6 with example 1, example 1 showed slightly poorer internal sizing performance, and the effect of treating wet and dry paper products with citric acid was better than the effect of directly treating pulp with citric acid. Because citric acid is soluble in water, when the pulp is treated by citric acid, the citric acid is lost too much during vacuum pulp suction, and the citric acid cannot sufficiently crosslink with cellulose.
Claims (10)
1. A method of enhancing pulp molding properties selected from one of three ways:
(1) Preparing plant fibers into fiber suspension, fluffing, and adding papermaking auxiliary agents to obtain slurry; mixing citric acid with a catalyst, and adding water to prepare a citric acid-catalyst mixed solution; mixing the slurry with the citric acid-catalyst mixed solution, stirring, absorbing slurry to obtain wet embryo paper products, and performing hot press molding on the wet embryo paper products to obtain pulp molded products; or (b)
(2) Preparing plant fibers into fiber suspension, fluffing, and adding papermaking auxiliary agents to obtain slurry; then the slurry is absorbed to prepare wet embryo paper products; mixing citric acid with a catalyst, and adding water to prepare a citric acid-catalyst mixed solution; soaking the wet embryonic paper product by using the citric acid-catalyst mixed solution, and performing hot press molding to obtain a pulp molding product; or (b)
(3) Preparing plant fibers into fiber suspension, fluffing, and adding papermaking auxiliary agents to obtain slurry; then the slurry is subjected to slurry absorption and hot press molding to prepare dry paper products; mixing citric acid with a catalyst, and adding water to prepare a citric acid-catalyst mixed solution; soaking the dry paper product at least once by using the citric acid-catalyst mixed solution, and performing hot press molding again to obtain a pulp molding product;
in the modes (1) to (3), the catalyst is selected from at least one of soluble phosphite, phosphotungstic acid and soluble citrate.
2. The method of claim 1, wherein when the catalyst selects a soluble phosphite, the mass ratio of citric acid to phosphite is (1-5): 1; when the catalyst selects phosphotungstic acid, the mass ratio of the citric acid to the phosphotungstic acid is (20-30): 1; when the catalyst selects soluble citrate, the mass ratio of the citric acid to the soluble citrate is (0.5-3): 1.
3. The method according to claim 1 or 2, wherein in modes (1) to (3), the plant fiber is at least one selected from the group consisting of bamboo pulp fiber, wood pulp fiber, pomace fiber, straw fiber, and cane pulp fiber.
4. A method according to claim 3, wherein in modes (1) to (3), the plant fibers are bamboo pulp fibers, wood pulp fibers and sugar cane pulp fibers; the mass ratio of the bamboo pulp fiber, the wood pulp fiber and the sugarcane pulp fiber can be (1-5) 1: (3-8).
5. The method according to claim 4, wherein in modes (1) to (3), the mass content of the plant fiber in the fiber suspension is 1% to 8%; preferably, the mass content of plant fibers in the fiber suspension is 2% -5%.
6. The method according to claim 1, wherein in modes (1) to (3), the mass content of citric acid in the citric acid-catalyst mixture is 5% to 20%; preferably, in the modes (1) to (3), the mass content of the citric acid in the citric acid-catalyst mixed solution is 8% to 15%.
7. The method according to claim 1, wherein in the mode (2), the soaking time is 20 to 90 minutes.
8. The method of claim 1, wherein in mode (3), the dry paper product is soaked at least twice with the citric acid-catalyst mixture; the soaking time is 30-90min.
9. Use of the method for enhancing pulp moulding properties according to any of claims 1-8 for the preparation of paper.
10. A pulp molded article, characterized by being produced by the method for enhancing pulp moldability of any one of claims 1 to 8; the pulp molding product has a compressive strength of more than 39.0 N.m/g and a burst index of more than 2.50 kPa.m when the thickness is 0.7+/-0.05 2 And/g, the waterproof contact angle is greater than 99.0 degrees.
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