CN116903921B - Pulp foam material and preparation method thereof - Google Patents
Pulp foam material and preparation method thereof Download PDFInfo
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- CN116903921B CN116903921B CN202311174604.3A CN202311174604A CN116903921B CN 116903921 B CN116903921 B CN 116903921B CN 202311174604 A CN202311174604 A CN 202311174604A CN 116903921 B CN116903921 B CN 116903921B
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- treatment
- pulp
- sepiolite powder
- foam material
- deionized water
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- 239000006261 foam material Substances 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title claims abstract description 31
- 239000004113 Sepiolite Substances 0.000 claims abstract description 68
- 239000000843 powder Substances 0.000 claims abstract description 68
- 229910052624 sepiolite Inorganic materials 0.000 claims abstract description 68
- 235000019355 sepiolite Nutrition 0.000 claims abstract description 68
- 239000008367 deionised water Substances 0.000 claims abstract description 41
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000007788 liquid Substances 0.000 claims abstract description 35
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 26
- 239000006260 foam Substances 0.000 claims abstract description 22
- 238000001035 drying Methods 0.000 claims abstract description 21
- 238000005187 foaming Methods 0.000 claims abstract description 14
- 235000021355 Stearic acid Nutrition 0.000 claims abstract description 11
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims abstract description 11
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims abstract description 11
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims abstract description 11
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims abstract description 11
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims abstract description 11
- 239000001509 sodium citrate Substances 0.000 claims abstract description 11
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims abstract description 11
- 239000008117 stearic acid Substances 0.000 claims abstract description 11
- 235000011083 sodium citrates Nutrition 0.000 claims abstract description 6
- 238000005507 spraying Methods 0.000 claims abstract description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 30
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 30
- 238000002156 mixing Methods 0.000 claims description 25
- 238000000465 moulding Methods 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 15
- 238000001354 calcination Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 13
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 10
- CYDQOEWLBCCFJZ-UHFFFAOYSA-N 4-(4-fluorophenyl)oxane-4-carboxylic acid Chemical compound C=1C=C(F)C=CC=1C1(C(=O)O)CCOCC1 CYDQOEWLBCCFJZ-UHFFFAOYSA-N 0.000 claims description 10
- KWIUHFFTVRNATP-UHFFFAOYSA-N Betaine Natural products C[N+](C)(C)CC([O-])=O KWIUHFFTVRNATP-UHFFFAOYSA-N 0.000 claims description 10
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 10
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims description 10
- 108010010803 Gelatin Proteins 0.000 claims description 10
- IMQLKJBTEOYOSI-GPIVLXJGSA-N Inositol-hexakisphosphate Chemical compound OP(O)(=O)O[C@H]1[C@H](OP(O)(O)=O)[C@@H](OP(O)(O)=O)[C@H](OP(O)(O)=O)[C@H](OP(O)(O)=O)[C@@H]1OP(O)(O)=O IMQLKJBTEOYOSI-GPIVLXJGSA-N 0.000 claims description 10
- KWIUHFFTVRNATP-UHFFFAOYSA-O N,N,N-trimethylglycinium Chemical compound C[N+](C)(C)CC(O)=O KWIUHFFTVRNATP-UHFFFAOYSA-O 0.000 claims description 10
- IMQLKJBTEOYOSI-UHFFFAOYSA-N Phytic acid Natural products OP(O)(=O)OC1C(OP(O)(O)=O)C(OP(O)(O)=O)C(OP(O)(O)=O)C(OP(O)(O)=O)C1OP(O)(O)=O IMQLKJBTEOYOSI-UHFFFAOYSA-N 0.000 claims description 10
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 10
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 10
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims description 10
- 229960003237 betaine Drugs 0.000 claims description 10
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 10
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 10
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 10
- 239000008273 gelatin Substances 0.000 claims description 10
- 229920000159 gelatin Polymers 0.000 claims description 10
- 235000019322 gelatine Nutrition 0.000 claims description 10
- 235000011852 gelatine desserts Nutrition 0.000 claims description 10
- 239000011121 hardwood Substances 0.000 claims description 10
- 235000002949 phytic acid Nutrition 0.000 claims description 10
- 239000000467 phytic acid Substances 0.000 claims description 10
- 229940068041 phytic acid Drugs 0.000 claims description 10
- 235000010482 polyoxyethylene sorbitan monooleate Nutrition 0.000 claims description 10
- 229920000053 polysorbate 80 Polymers 0.000 claims description 10
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 10
- 238000002791 soaking Methods 0.000 claims description 10
- 235000010413 sodium alginate Nutrition 0.000 claims description 10
- 239000000661 sodium alginate Substances 0.000 claims description 10
- 229940005550 sodium alginate Drugs 0.000 claims description 10
- 239000001540 sodium lactate Substances 0.000 claims description 10
- 229940005581 sodium lactate Drugs 0.000 claims description 10
- 235000011088 sodium lactate Nutrition 0.000 claims description 10
- 239000011975 tartaric acid Substances 0.000 claims description 10
- 235000002906 tartaric acid Nutrition 0.000 claims description 10
- 239000000230 xanthan gum Substances 0.000 claims description 10
- 235000010493 xanthan gum Nutrition 0.000 claims description 10
- 229920001285 xanthan gum Polymers 0.000 claims description 10
- 229940082509 xanthan gum Drugs 0.000 claims description 10
- 239000012530 fluid Substances 0.000 claims description 8
- 241000220479 Acacia Species 0.000 claims description 5
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 claims description 5
- 235000010643 Leucaena leucocephala Nutrition 0.000 claims description 5
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 5
- 235000010489 acacia gum Nutrition 0.000 claims description 5
- 239000001785 acacia senegal l. willd gum Substances 0.000 claims description 5
- 229940105329 carboxymethylcellulose Drugs 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000000265 homogenisation Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 238000003828 vacuum filtration Methods 0.000 claims description 5
- 229940068984 polyvinyl alcohol Drugs 0.000 claims description 4
- 235000019422 polyvinyl alcohol Nutrition 0.000 claims description 4
- 229940083608 sodium hydroxide Drugs 0.000 claims description 4
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 4
- 230000014759 maintenance of location Effects 0.000 abstract description 4
- 230000006835 compression Effects 0.000 description 12
- 238000007906 compression Methods 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 6
- 238000009413 insulation Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000011256 inorganic filler Substances 0.000 description 2
- 229910003475 inorganic filler Inorganic materials 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000010097 foam moulding Methods 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 229910052901 montmorillonite Inorganic materials 0.000 description 1
- 239000005543 nano-size silicon particle Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/30—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by mixing gases into liquid compositions or plastisols, e.g. frothing with air
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J2301/02—Cellulose; Modified cellulose
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2405/00—Characterised by the use of polysaccharides or of their derivatives not provided for in groups C08J2401/00 or C08J2403/00
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2405/00—Characterised by the use of polysaccharides or of their derivatives not provided for in groups C08J2401/00 or C08J2403/00
- C08J2405/02—Dextran; Derivatives thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2489/00—Characterised by the use of proteins; Derivatives thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/22—Expanded, porous or hollow particles
- C08K7/24—Expanded, porous or hollow particles inorganic
- C08K7/26—Silicon- containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/02—Ingredients treated with inorganic substances
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/08—Ingredients agglomerated by treatment with a binding agent
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Paper (AREA)
Abstract
The invention provides a paper pulp foam material and a preparation method thereof, belonging to the technical field of paper pulp foam; the preparation method comprises the steps of preparing paper pulp solution, modifying sepiolite powder, preparing paper pulp foaming solution, preparing primary paper pulp foam material and post-treatment; spraying post-treatment liquid on the surface of the primary pulp foam material, drying for 1.8-2.2h at 44-46 ℃ under vacuum, forming, standing for 18-22min at-8 to-4 ℃ after forming, and naturally recovering to room temperature to obtain the pulp foam material; the post-treatment liquid consists of stearic acid, sodium citrate, polyvinylpyrrolidone and deionized water, wherein the mass ratio is 2.3-2.5:1.4-1.6:1.8-2.2:68-80. The paper pulp foam material prepared by the invention has the advantages of improving mechanical properties, reducing heat conductivity coefficient and ensuring the retention rate of mechanical properties in a wet state.
Description
Technical Field
The invention belongs to the technical field of pulp foam, and particularly relates to a pulp foam material and a preparation method thereof.
Background
The foam material is a light high-porosity material capable of achieving certain specific performance indexes, has the characteristics of light weight, permeability, high porosity, high contact area and the like, and gradually becomes a hot spot for new material research;
the pulp has great application potential as a green renewable and degradable material of main cellulose.
The pulp foam material is prepared by utilizing a foam molding technology, has higher heat insulation and sound absorption performance, and is prepared by adding a surfactant into slurry suspension, reducing the surface tension of the slurry after mechanical stirring foaming to form stable bubbles, and further drying and removing residual moisture;
but as a porous material with low density, the mechanical property of the pulp foam material is poor and cannot adapt to harsh environments;
in the prior art, inorganic fillers such as nano silicon dioxide, montmorillonite and the like and functional auxiliary agents are added to enhance the functionality of the foam pulp material, but the inorganic fillers are easy to agglomerate, so that the problem of two-phase/multi-phase interface combination is introduced, the foaming performance is influenced, and the heat insulation performance of the pulp foam material is reduced.
Therefore, providing a pulp foam material, improving mechanical properties, improving retention of mechanical properties in different environments, and enhancing heat insulation properties is a technical problem to be solved in the prior art.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a paper pulp foam material and a preparation method thereof, which can improve the mechanical property, improve the retention rate of the mechanical property under different environments and enhance the heat insulation property.
In order to solve the technical problems, the invention adopts the following technical scheme:
a preparation method of a pulp foam material specifically comprises the following steps:
1. preparation of pulp solution
Mixing bleached hardwood pulp with deionized water, adding treatment fluid, performing ultrasonic vibration after mixing, controlling the frequency of ultrasonic vibration to be 38-42kHz, the power of ultrasonic vibration to be 18-22kW, and the time of ultrasonic vibration to be 26-33min to prepare a pulp solution;
the mass ratio of the bleached hardwood pulp to deionized water to the treatment fluid is 4-7:180-220:2.2-2.6;
the preparation method of the treatment fluid comprises the steps of mixing gelatin, arabic gum, xanthan gum and deionized water, performing heat treatment at 58-62 ℃ for 32-37min, then cooling to 1.8-2.2 ℃ at 0.4-0.6 ℃/min, adding sodium hydroxide, polyvinyl alcohol and betaine, uniformly stirring, standing at 1.8-2.2 ℃ for 18-22min, and ending the standing to obtain the treatment fluid;
the mass ratio of the deionized water to the gelatin, the acacia, the xanthan gum, the sodium hydroxide, the polyvinyl alcohol and the betaine is 110-130:1.0-1.4:0.6-1.0:1.4-1.6:1.6-1.8:2.1-2.5:1.8-2.2.
2. Modified sepiolite powder
(1) Calcination
Soaking sepiolite powder in hydrochloric acid solution for 48-52min, drying after soaking, calcining in a calciner at 265-275 deg.C for 1.4-1.6 hr, and returning to room temperature to obtain calcined sepiolite powder;
the sepiolite powder has particle diameter of 70-90nm and density of 1.1-1.3g/cm 3 ，SiO 2 The content is 58.2-59.0%, and the MgO content is 23.4-23.8%;
the mass concentration of the hydrochloric acid solution is 38-42%;
the mass ratio of the sepiolite powder to the hydrochloric acid solution is 1:5-7;
(2) Vacuum homogenizing treatment
Mixing the calcined sepiolite powder with deionized water, adding hexadecyl trimethyl ammonium bromide, carboxymethyl cellulose, sodium alginate and phytic acid, homogenizing in a vacuum homogenizer at a vacuum degree of 37-43kPa and a rotating speed of 410-430rpm for 2 times, homogenizing for 6-8min each time, and drying after finishing to obtain the sepiolite powder after vacuum homogenizing;
the mass ratio of the calcined sepiolite powder to deionized water to cetyl trimethyl ammonium bromide to carboxymethyl cellulose to sodium alginate to phytic acid is 28-32:124-135:3.0-3.2:4.0-4.4:1.8-2.2:1.6-1.8;
(3) Low temperature low pressure treatment
And (3) carrying out low-temperature and low-pressure treatment on the sepiolite powder subjected to the vacuum homogenization treatment, wherein the treatment temperature is between-16 ℃ and-12 ℃, the treatment pressure is between 0.10MPa and 0.14MPa, the treatment time is between 18min and 22min, and the modified sepiolite powder is prepared after the treatment is finished.
3. Preparation of pulp foaming solution
Mixing the paper pulp solution with modified sepiolite powder and sodium dodecyl sulfate, mechanically stirring at 980-1020rpm for 28-32min, adding tartaric acid, sodium lactate and Tween 80, and continuously stirring for 8-12min to obtain paper pulp foaming solution;
the mass ratio of the paper pulp solution to the modified sepiolite powder to the sodium dodecyl sulfate to the tartaric acid to the sodium lactate to the tween 80 is 190-210:1.2-1.4:0.1-0.3:0.3-0.5:1.6-1.8:0.1-0.3.
4. Preparation of Primary pulp foam
Removing excessive foam and liquid by vacuum filtration, standing the obtained pulp foam at 24-26 ℃ for 1.8-2.2h, and drying at 44-46 ℃ for 1.8-2.2h for molding to obtain the primary pulp foam material.
5. Post-treatment
Spraying post-treatment liquid on the surface of the primary pulp foam material, drying for 1.8-2.2h at 44-46 ℃ under vacuum condition, molding, standing for 18-22min at-8-4 ℃ after molding, and naturally recovering to room temperature to obtain the pulp foam material;
the mass ratio of the primary pulp foam material to the post-treatment liquid is 10:1.0-1.2;
the post-treatment liquid consists of stearic acid, sodium citrate, polyvinylpyrrolidone and deionized water, wherein the mass ratio of the stearic acid to the sodium citrate to the polyvinylpyrrolidone to the deionized water is 2.3-2.5:1.4-1.6:1.8-2.2:68-80.
Compared with the prior art, the invention has the beneficial effects that:
1. the sepiolite powder is modified, the porosity of the sepiolite powder is increased, the density of the pulp foam material is further reduced, the specific modification method is adopted, the aggregation of the sepiolite powder is avoided, the combination with other components is promoted, the stability and uniformity of an internal structure are improved, the sepiolite powder is combined with specific paper pulp solution, post-treatment and other technical means, the mechanical performance is improved, the heat conductivity is reduced, and the mechanical performance retention rate in a wet state is ensured;
the density of the pulp foam material prepared by the method is 14.70-14.75mg/cm 3 The compression strength is 1.03-1.06MPa, the tensile strength is 6.41-6.48MPa, the elastic modulus is 10.0-10.3MPa, and the heat conductivity coefficient is 10-12 mW/(m.K);
in the state that the moisture content in a humid environment is 10%, the compression strength is 1.00-1.04MPa, the tensile strength is 6.28-6.36MPa, and the elastic modulus is 9.6-10.1MPa.
Detailed Description
For a clearer understanding of the technical features, objects and effects of the present invention, specific embodiments of the present invention will be described.
Example 1
A preparation method of a pulp foam material specifically comprises the following steps:
1. preparation of pulp solution
Mixing bleached hardwood pulp with deionized water, adding treatment liquid, performing ultrasonic vibration after mixing, controlling the frequency of ultrasonic vibration to be 40kHz, the power of ultrasonic vibration to be 20kW, and the time of ultrasonic vibration to be 30min to prepare a pulp solution;
the mass ratio of the bleached hardwood pulp to deionized water to the treatment fluid is 6:200:2.4;
the preparation method of the treatment liquid comprises the steps of mixing gelatin, arabic gum, xanthan gum and deionized water, performing heat treatment at 60 ℃ for 35min, then cooling to 2 ℃ at 0.5 ℃/min, adding sodium hydroxide, polyvinyl alcohol and betaine, uniformly stirring, and then standing at 2 ℃ for 20min, wherein the standing is finished to obtain the treatment liquid;
the mass ratio of deionized water to gelatin, acacia, xanthan gum, sodium hydroxide, polyvinyl alcohol and betaine is 120:1.2:0.8:1.5:1.7:2.3:2.0.
2. Modified sepiolite powder
(1) Calcination
Soaking sepiolite powder in hydrochloric acid solution for 50min, drying after soaking, calcining in a calciner at 270 ℃ for 1.5h, and returning to room temperature after calcining to obtain calcined sepiolite powder;
the sepiolite powder has a particle size of 80nm and a density of 1.2g/cm 3 ，SiO 2 58.7 percent of MgO and 23.6 percent of MgO;
the mass concentration of the hydrochloric acid solution is 40%;
the mass ratio of the sepiolite powder to the hydrochloric acid solution is 1:6;
(2) Vacuum homogenizing treatment
Mixing the calcined sepiolite powder with deionized water, adding hexadecyl trimethyl ammonium bromide, carboxymethyl cellulose, sodium alginate and phytic acid, homogenizing in a vacuum homogenizer at a vacuum degree of 40kPa and a rotation speed of 420rpm for 2 times, homogenizing for 7min each time, and drying after finishing to obtain the sepiolite powder after vacuum homogenizing;
the mass ratio of the calcined sepiolite powder to deionized water to cetyl trimethyl ammonium bromide to carboxymethyl cellulose to sodium alginate to phytic acid is 30:130:3.1:4.2:2.0:1.7;
(3) Low temperature low pressure treatment
And (3) carrying out low-temperature and low-pressure treatment on the sepiolite powder subjected to the vacuum homogenization treatment, wherein the treatment temperature is-14 ℃, the treatment pressure is 0.12MPa, the treatment time is 20min, and the modified sepiolite powder is obtained after the treatment is finished.
3. Preparation of pulp foaming solution
Mixing the paper pulp solution with modified sepiolite powder and sodium dodecyl sulfate, mechanically stirring at 1000rpm for 30min, adding tartaric acid, sodium lactate and Tween 80, and continuously stirring for 10min to obtain paper pulp foaming solution;
the mass ratio of the paper pulp solution to the modified sepiolite powder to the sodium dodecyl sulfate to the tartaric acid to the sodium lactate to the tween 80 is 200:1.3:0.2:0.4:1.7:0.2.
4. Preparation of Primary pulp foam
Removing excessive foam and liquid by vacuum filtration, standing the obtained pulp foam at 25 ℃ for 2 hours, and drying at 45 ℃ under vacuum condition for 2 hours for molding to obtain the primary pulp foam material.
5. Post-treatment
Spraying post-treatment liquid on the surface of the primary pulp foam material, drying for 2 hours at 45 ℃ under vacuum condition for molding, standing for 20 minutes at minus 6 ℃ after molding, and naturally recovering to room temperature to prepare the pulp foam material;
the mass ratio of the primary pulp foam material to the post-treatment liquid is 10:1.1;
the post-treatment liquid consists of stearic acid, sodium citrate, polyvinylpyrrolidone and deionized water, wherein the mass ratio of the stearic acid to the sodium citrate to the polyvinylpyrrolidone to the deionized water is 2.4:1.5:2.0:70.
The pulp foam obtained by the method of example 1 had a density of 14.75mg/cm 3 The compression strength is 1.06MPa, the tensile strength is 6.48MPa, the elastic modulus is 10.3MPa, and the heat conductivity coefficient is 12 mW/(m.K);
the pulp foam material prepared by the method of example 1 had a compression strength of 1.04MPa, a tensile strength of 6.36MPa and an elastic modulus of 10.1MPa in a state where the moisture content in a wet environment was 10%.
Example 2
A preparation method of a pulp foam material specifically comprises the following steps:
1. preparation of pulp solution
Mixing bleached hardwood pulp with deionized water, adding treatment liquid, performing ultrasonic vibration after mixing, controlling the frequency of ultrasonic vibration to be 38kHz, the power of ultrasonic vibration to be 18kW, and the time of ultrasonic vibration to be 26min to prepare a pulp solution;
the mass ratio of the bleached hardwood pulp to deionized water to the treatment fluid is 4:180:2.2;
the preparation method of the treatment liquid comprises the steps of mixing gelatin, arabic gum, xanthan gum and deionized water, performing heat treatment at 58 ℃ for 32min, then cooling to 1.8 ℃ at 0.4 ℃/min, adding sodium hydroxide, polyvinyl alcohol and betaine, uniformly stirring, and standing at 1.8 ℃ for 18min, wherein the standing is finished to obtain the treatment liquid;
the mass ratio of deionized water to gelatin, acacia, xanthan gum, sodium hydroxide, polyvinyl alcohol and betaine is 110:1.0:0.6:1.4:1.6:2.1:1.8.
2. Modified sepiolite powder
(1) Calcination
Soaking sepiolite powder in hydrochloric acid solution for 48min, drying after soaking, calcining in a calciner at 265 ℃ for 1.4h, and returning to room temperature after calcining to obtain calcined sepiolite powder;
the sepiolite powder has a particle size of 70nm and a density of 1.1g/cm 3 ，SiO 2 58.2 percent of MgO and 23.4 percent of MgO;
the mass concentration of the hydrochloric acid solution is 38%;
the mass ratio of the sepiolite powder to the hydrochloric acid solution is 1:5;
(2) Vacuum homogenizing treatment
Mixing the calcined sepiolite powder with deionized water, adding hexadecyl trimethyl ammonium bromide, carboxymethyl cellulose, sodium alginate and phytic acid, homogenizing in a vacuum homogenizer at a vacuum degree of 37kPa and a rotation speed of 410rpm for 2 times, homogenizing for 6min each time, and drying after finishing to obtain the sepiolite powder after vacuum homogenizing;
the mass ratio of the calcined sepiolite powder to deionized water to cetyl trimethyl ammonium bromide to carboxymethyl cellulose to sodium alginate to phytic acid is 28:124:3.0:4.0:1.8:1.6;
(3) Low temperature low pressure treatment
And (3) carrying out low-temperature and low-pressure treatment on the sepiolite powder subjected to the vacuum homogenization treatment, wherein the treatment temperature is-16 ℃, the treatment pressure is 0.10MPa, the treatment time is 18min, and the modified sepiolite powder is prepared after the treatment is finished.
3. Preparation of pulp foaming solution
Mixing the paper pulp solution with modified sepiolite powder and sodium dodecyl sulfate, mechanically stirring at 980rpm for 32min, adding tartaric acid, sodium lactate and Tween 80, and continuously stirring for 8min to obtain paper pulp foaming solution;
the mass ratio of the paper pulp solution to the modified sepiolite powder to the sodium dodecyl sulfate to the tartaric acid to the sodium lactate to the tween 80 is 190:1.2:0.1:0.3:1.6:0.1.
4. Preparation of Primary pulp foam
Removing excessive foam and liquid by vacuum filtration, standing the obtained pulp foam at 24 ℃ for 2.2 hours, and then drying at 44 ℃ under vacuum for 2.2 hours for molding to obtain the primary pulp foam material.
5. Post-treatment
Spraying post-treatment liquid on the surface of the primary pulp foam material, drying for 1.8 hours at 46 ℃ under vacuum condition, molding, standing for 18 minutes at-8 ℃ after molding, and naturally recovering to room temperature to prepare the pulp foam material;
the mass ratio of the primary pulp foam material to the post-treatment liquid is 10:1.0;
the post-treatment liquid consists of stearic acid, sodium citrate, polyvinylpyrrolidone and deionized water, wherein the mass ratio of the stearic acid to the sodium citrate to the polyvinylpyrrolidone to the deionized water is 2.3:1.4:1.8:68.
Pulp foam obtained by the method of example 2 had a density of 14.70mg/cm 3 The compression strength is 1.03MPa, the tensile strength is 6.41MPa, the elastic modulus is 10.0MPa, and the heat conductivity coefficient is 10 mW/(m.K);
the pulp foam material prepared by the method of example 2 had a compression strength of 1.00MPa, a tensile strength of 6.28MPa and an elastic modulus of 9.6MPa in a state where the moisture content in a wet environment was 10%.
Example 3
A preparation method of a pulp foam material specifically comprises the following steps:
1. preparation of pulp solution
Mixing bleached hardwood pulp with deionized water, adding treatment liquid, performing ultrasonic vibration after mixing, controlling the frequency of ultrasonic vibration to be 42kHz, the power of ultrasonic vibration to be 22kW, and the time of ultrasonic vibration to be 33min to prepare a pulp solution;
the mass ratio of the bleached hardwood pulp to deionized water to the treatment fluid is 7:220:2.6;
the preparation method of the treatment liquid comprises the steps of mixing gelatin, arabic gum, xanthan gum and deionized water, performing heat treatment at 62 ℃ for 37min, then cooling to 2.2 ℃ at 0.6 ℃/min, adding sodium hydroxide, polyvinyl alcohol and betaine, uniformly stirring, and standing at 2.2 ℃ for 22min, wherein the standing is finished to obtain the treatment liquid;
the mass ratio of deionized water to gelatin, acacia, xanthan gum, sodium hydroxide, polyvinyl alcohol and betaine is 130:1.4:1.0:1.6:1.8:2.5:2.2.
2. Modified sepiolite powder
(1) Calcination
Soaking sepiolite powder in hydrochloric acid solution for 52min, drying after soaking, calcining in a calciner at 275 ℃ for 1.6h, and returning to room temperature after calcining to obtain calcined sepiolite powder;
the sepiolite powder has a particle size of 90nm and a density of 1.3g/cm 3 ，SiO 2 The content is 59.0 percent, and the MgO content is 23.8 percent;
the mass concentration of the hydrochloric acid solution is 42%;
the mass ratio of the sepiolite powder to the hydrochloric acid solution is 1:7;
(2) Vacuum homogenizing treatment
Mixing the calcined sepiolite powder with deionized water, adding hexadecyl trimethyl ammonium bromide, carboxymethyl cellulose, sodium alginate and phytic acid, homogenizing in a vacuum homogenizer at a vacuum degree of 43kPa and a rotating speed of 430rpm for 2 times, homogenizing for 8min each time, and drying after finishing to obtain the sepiolite powder after vacuum homogenizing;
the mass ratio of the calcined sepiolite powder to deionized water to cetyl trimethyl ammonium bromide to carboxymethyl cellulose to sodium alginate to phytic acid is 32:135:3.2:4.4:2.2:1.8;
(3) Low temperature low pressure treatment
And (3) carrying out low-temperature and low-pressure treatment on the sepiolite powder subjected to the vacuum homogenization treatment, wherein the treatment temperature is-12 ℃, the treatment pressure is 0.14MPa, the treatment time is 22min, and the modified sepiolite powder is obtained after the treatment is finished.
3. Preparation of pulp foaming solution
Mixing the paper pulp solution with modified sepiolite powder and sodium dodecyl sulfate, mechanically stirring at 1020rpm for 28min, adding tartaric acid, sodium lactate and Tween 80, and continuously stirring for 12min to obtain paper pulp foaming solution;
the mass ratio of the paper pulp solution to the modified sepiolite powder to the sodium dodecyl sulfate to the tartaric acid to the sodium lactate to the tween 80 is 210:1.4:0.3:0.5:1.8:0.3.
4. Preparation of Primary pulp foam
The excess foam and liquid are removed by vacuum filtration, the obtained pulp foam is stood for 1.8 hours at 26 ℃, and then dried for 1.8 hours under the vacuum condition at 46 ℃ for molding, so that the primary pulp foam material is prepared.
5. Post-treatment
Spraying post-treatment liquid on the surface of the primary pulp foam material, drying for 2.2 hours at 44 ℃ under vacuum condition, molding, standing for 22min at-4 ℃ after molding, and naturally recovering to room temperature to prepare the pulp foam material;
the mass ratio of the primary pulp foam material to the post-treatment liquid is 10:1.2;
the post-treatment liquid consists of stearic acid, sodium citrate, polyvinylpyrrolidone and deionized water, wherein the mass ratio of the stearic acid to the sodium citrate to the polyvinylpyrrolidone to the deionized water is 2.5:1.6:2.2:80.
Pulp foam material prepared by the method of example 3 had a density of 14.73mg/cm 3 The compression strength is 1.05MPa, the tensile strength is 6.43MPa, the elastic modulus is 10.2MPa, and the heat conductivity coefficient is 11 mW/(m.K);
the pulp foam material prepared by the method of example 3 had a compression strength of 1.02MPa, a tensile strength of 6.32MPa and an elastic modulus of 9.8MPa in a state where the moisture content in a wet environment was 10%.
Comparative example 1
On the basis of example 1, the modification step of sepiolite powder was omitted, sepiolite powder without any treatment was directly used, and the rest of the operations were the same.
The pulp foam obtained by the method of comparative example 1 had a density of 15.94mg/cm 3 The compression strength is 0.64MPa, the tensile strength is 4.72MPa, the elastic modulus is 6.85MPa, and the heat conductivity coefficient is 19 mW/(m.K);
the pulp foam material prepared by the method of comparative example 1 had a compression strength of 0.38MPa, a tensile strength of 2.88MPa and an elastic modulus of 4.04MPa in a state where the moisture content in a wet environment was 10%.
Comparative example 2
On the basis of example 1, the modification was that in the step of preparing a pulp solution, the treatment liquid component and the shaking treatment were omitted, and the post-treatment step was omitted, and the remaining operations were the same.
The pulp foam obtained by the method of comparative example 2 had a density of 14.86mg/cm 3 The compression strength is 0.68MPa, the tensile strength is 4.75MPa, the elastic modulus is 6.90MPa, and the heat conductivity coefficient is 18 mW/(m.K);
the pulp foam material prepared by the method of comparative example 2 had a compression strength of 0.43MPa, a tensile strength of 3.00MPa and an elastic modulus of 4.21MPa in a state where the moisture content in a wet environment was 10%.
The percentages used in the present invention are mass percentages unless otherwise indicated.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. A method for preparing a pulp foam material is characterized in that,
the preparation method comprises the steps of preparing paper pulp solution, modifying sepiolite powder, preparing paper pulp foaming solution, preparing primary paper pulp foam material and post-treatment; the method comprises the following steps:
(1) Preparation of pulp solution
Mixing bleached hardwood pulp with deionized water, adding treatment liquid, performing ultrasonic vibration after mixing, controlling the frequency of ultrasonic vibration to be 40kHz, the power of ultrasonic vibration to be 20kW, and the time of ultrasonic vibration to be 30min to prepare a pulp solution;
the mass ratio of the bleached hardwood pulp to deionized water to the treatment fluid is 6:200:2.4;
the preparation method of the treatment liquid comprises the steps of mixing gelatin, arabic gum, xanthan gum and deionized water, performing heat treatment at 60 ℃ for 35min, then cooling to 2 ℃ at 0.5 ℃/min, adding sodium hydroxide, polyvinyl alcohol and betaine, uniformly stirring, and then standing at 2 ℃ for 20min, wherein the standing is finished to obtain the treatment liquid;
the mass ratio of deionized water to gelatin, acacia, xanthan gum, sodium hydroxide, polyvinyl alcohol and betaine is 120:1.2:0.8:1.5:1.7:2.3:2.0;
(2) Modified sepiolite powder
a. Calcination
Soaking sepiolite powder in hydrochloric acid solution for 50min, drying after soaking, calcining in a calciner at 270 ℃ for 1.5h, and returning to room temperature after calcining to obtain calcined sepiolite powder;
the sepiolite powder has a particle size of 80nm and a density of 1.2g/cm 3 ，SiO 2 58.7 percent of MgO and 23.6 percent of MgO;
the mass concentration of the hydrochloric acid solution is 40%;
the mass ratio of the sepiolite powder to the hydrochloric acid solution is 1:6;
b. vacuum homogenizing treatment
Mixing the calcined sepiolite powder with deionized water, adding hexadecyl trimethyl ammonium bromide, carboxymethyl cellulose, sodium alginate and phytic acid, homogenizing in a vacuum homogenizer at a vacuum degree of 40kPa and a rotation speed of 420rpm for 2 times, homogenizing for 7min each time, and drying after finishing to obtain the sepiolite powder after vacuum homogenizing;
the mass ratio of the calcined sepiolite powder to deionized water to cetyl trimethyl ammonium bromide to carboxymethyl cellulose to sodium alginate to phytic acid is 30:130:3.1:4.2:2.0:1.7;
c. low temperature low pressure treatment
Carrying out low-temperature low-pressure treatment on the sepiolite powder subjected to the vacuum homogenization treatment, wherein the treatment temperature is-14 ℃, the treatment pressure is 0.12MPa, the treatment time is 20min, and the modified sepiolite powder is prepared after the treatment is finished;
(3) Preparation of pulp foaming solution
Mixing the paper pulp solution with modified sepiolite powder and sodium dodecyl sulfate, mechanically stirring at 1000rpm for 30min, adding tartaric acid, sodium lactate and Tween 80, and continuously stirring for 10min to obtain paper pulp foaming solution;
the mass ratio of the paper pulp solution to the modified sepiolite powder to the sodium dodecyl sulfate to the tartaric acid to the sodium lactate to the tween 80 is 200:1.3:0.2:0.4:1.7:0.2;
(4) Preparation of Primary pulp foam
Removing excessive foam and liquid by vacuum filtration, standing the obtained pulp foam at 25 ℃ for 2 hours, and then drying at 45 ℃ under vacuum condition for 2 hours for molding to obtain a primary pulp foam material;
(5) Post-treatment
Spraying post-treatment liquid on the surface of the primary pulp foam material, drying for 2 hours at 45 ℃ under vacuum condition for molding, standing for 20 minutes at minus 6 ℃ after molding, and naturally recovering to room temperature to prepare the pulp foam material;
the mass ratio of the primary pulp foam material to the post-treatment liquid is 10:1.1;
the post-treatment liquid consists of stearic acid, sodium citrate, polyvinylpyrrolidone and deionized water, wherein the mass ratio of the stearic acid to the sodium citrate to the polyvinylpyrrolidone to the deionized water is 2.4:1.5:2.0:70.
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