CN108102146B - Application of inorganic nano material in improving smoothness and softness of cellulose membrane - Google Patents
Application of inorganic nano material in improving smoothness and softness of cellulose membrane Download PDFInfo
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- CN108102146B CN108102146B CN201711445510.XA CN201711445510A CN108102146B CN 108102146 B CN108102146 B CN 108102146B CN 201711445510 A CN201711445510 A CN 201711445510A CN 108102146 B CN108102146 B CN 108102146B
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- 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
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- 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
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- 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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/346—Clay
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- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
Abstract
The invention discloses a preparation method of a regenerated cellulose/inorganic nano-material composite membrane, which comprises the steps of firstly preparing an aqueous suspension of an inorganic nano-material, mixing the aqueous suspension with an ionic liquid aqueous solution, and dewatering and concentrating; then mixing the concentrated ionic liquid suspension of the inorganic nano material with a cellulose raw material, and carrying out dehydration and defoaming treatment to obtain a uniform and transparent cellulose/inorganic nano material solution; and finally, regenerating the cellulose/inorganic nano material solution to obtain a regenerated cellulose/inorganic nano material composite film. The preparation method of the invention improves the defects of low smoothness, poor softness, poor usability under low-temperature and high-humidity conditions and the like of the traditional regenerated cellulose membrane, and improves the quality of the cellulose membrane; meanwhile, the problems of high energy consumption and high pollution in the traditional preparation process of the regenerated cellulose membrane are solved.
Description
Technical Field
The invention relates to an application of an inorganic nano material in the aspects of improving the smoothness and softness of a cellulose membrane.
Background
Under the current severe environment-friendly situation, the application of the regenerated cellulose membrane is more and more extensive, and especially in the field of food and drug packaging, the cellulose membrane is favored by the unique characteristics of easy tearing, easy distortion, good air permeability and excellent printing composite performance. In developed countries in Europe and America, the regenerated cellulose membrane with the largest use amount belongs to two fields of meat food packaging and medicine packaging such as ham and the like, but with the continuous improvement of production efficiency, the regenerated cellulose membrane has the limitations of low smoothness, poor softness, poor usability under low-temperature and high-humidity conditions and the like under special use conditions.
According to investigation, the required environmental temperature is below 15 ℃ when meat such as ham and the like is produced or processed, the temperature of meat products packaged by the cellulose membrane is required to be 0-5 ℃, the relative humidity is about 70% RH, and the requirement on the smoothness of the cellulose membrane is quite high under the low-temperature and high-humidity condition; in the field of medicine packaging, a consumable material of a full-automatic medicine dispensing machine is a composite film of regenerated cellulose and polyethylene, and the requirements of the processing and using processes of products on the smoothness and softness of a regenerated cellulose film are strict.
Currently, the conventional cellulose film preparation in industry uses a multi-step, complex viscose process. The process is a high-energy-consumption and heavy-pollution technology, is complex and long, is difficult to control conditions, and has various chemical species, strong toxicity and corrosivity and large consumption; in the production process, a large amount of waste gas and waste water with high acidity and difficult treatment are generated. Therefore, researchers turn to new green and efficient cellulose membrane production processes, and at the present stage, methods for producing cellulose materials by dissolving ionic liquids are widely concerned. The invention provides a preparation method for preparing a regenerated cellulose/inorganic nano-material composite membrane by taking ionic liquid as a solvent, which not only meets the requirements of food and medicine packaging on smoothness and softness of a regenerated cellulose membrane, but also avoids the problems of high energy consumption and high pollution of the traditional regenerated cellulose membrane preparation.
Disclosure of Invention
The invention provides a preparation method of a regenerated cellulose/inorganic nano-material composite membrane by taking ionic liquid as a solvent, which overcomes the defects of low smoothness, poor softness, poor usability under low-temperature and high-humidity conditions and the like of the traditional regenerated cellulose membrane and improves the quality of the cellulose membrane; meanwhile, the problems of high energy consumption and high pollution in the traditional preparation process of the regenerated cellulose membrane are solved.
In order to achieve the purpose, the invention adopts the following technical scheme:
an application of inorganic nano material in improving smoothness and softness of cellulose membrane is prepared by preparing water suspension of inorganic nano material, mixing with ionic liquid water solution, dewatering and concentrating; then mixing the concentrated ionic liquid suspension of the inorganic nano material with a cellulose raw material, and carrying out dehydration and defoaming treatment to obtain a uniform and transparent cellulose/inorganic nano material solution; and finally, regenerating the cellulose/inorganic nano material solution to obtain a regenerated cellulose/inorganic nano material composite film.
The preparation method of the regenerated cellulose/inorganic nano-material composite membrane specifically comprises the following steps:
(1) preparing an aqueous suspension of inorganic nano materials: dispersing and mixing inorganic nano materials in water to obtain uniform suspension;
(2) preparing ionic liquid suspension of inorganic nano materials: fully stirring the aqueous suspension of the inorganic nano material obtained in the step (1) and an ionic liquid aqueous solution, and performing dewatering concentration treatment after uniform mixing;
(3) preparing a cellulose/inorganic nano material solution: mixing a cellulose raw material with the ionic liquid suspension of the inorganic nano material obtained in the step (2) according to a certain proportion, and dehydrating and defoaming after uniformly mixing to obtain a uniform and transparent cellulose/inorganic nano material solution;
(4) and (3) film regeneration: shaping the cellulose/inorganic nano material solution prepared in the step (3), and regenerating a film in a coagulating bath;
(5) and (3) post-treatment: and washing, plasticizing, drying and humidifying the regenerated cellulose membrane to obtain the regenerated cellulose/inorganic nano-material composite membrane.
Preferably, the inorganic nano material in the step (1) includes nano clay and nano oxide.
Preferably, the mass percentage of the inorganic nano material in the suspension in the step (1) is 0.5-10%, the mixing is performed by adopting a high-speed mechanical stirring or ultrasonic mode, the mixing temperature is 30-50 ℃, and the mixing time is 10-30 min.
Preferably, the ionic liquid in the step (2) is any one or more of the following ionic liquids: 1-allyl-3-methylimidazole chloride salt, 1-ethyl-3-methylimidazole acetate salt, 1-butyl-3-methylimidazole acetate salt, 1-ethyl-3-methylimidazole chloride salt, 1-ethyl-3-methylimidazole bromide salt and 1-butyl-3-methylimidazole chloride salt.
Preferably, in the step (2), the mass concentration of the ionic liquid aqueous solution is 40-60%, the mass percentage of the inorganic nano material in the pure ionic liquid is 0.05-0.15%, and the stirring and mixing time is 10-60 min. Mixing an ionic liquid aqueous solution with a certain concentration with an aqueous suspension of an inorganic nano material, wherein if the concentration of the ionic liquid aqueous solution is too high, the viscosity difference of the two systems is large, which is not beneficial to the mixing of the two systems and the dispersion of the inorganic nano material in the ionic liquid aqueous solution; if the concentration of the ionic liquid aqueous solution is too low, the dehydration load of the subsequent steps is increased, and the energy consumption is increased.
Preferably, in the step (2), a vacuum heating mode is adopted for dewatering and concentrating treatment, the water content of the ionic liquid suspension of the inorganic nano material obtained after dewatering and concentrating treatment is 2-10%, and the mass concentration of the ionic liquid aqueous solution is 90-98%.
Preferably, the mass percentage of the cellulose raw material in the step (3) is 5-15%, the mixing temperature is 30-60 ℃, and the mixing time is 20-50 min.
Preferably, the ionic liquid suspension of the inorganic nano-materials uniformly mixed in the step (3) is dehydrated and defoamed by a vacuum heating method.
Preferably, in the step (4), the coagulation bath is water or an aqueous solution of an ionic liquid, the temperature of the coagulation bath is 30-60 ℃, and the mass percentage of the ionic liquid in the aqueous solution of the ionic liquid is 0-60%.
In the technical scheme of the invention, the inorganic nano material is used for improving the smoothness and softness of the regenerated cellulose membrane.
The beneficial technical effects of the invention are as follows: the method adopts natural cellulose as a raw material, takes the ionic liquid as a solvent to prepare the regenerated cellulose membrane/inorganic nano composite material, does not use toxic and harmful acid, alkali and volatile organic solvent, and has the advantages of clean and environment-friendly production process, repeated recycling of the ionic liquid, low production cost and degradable product in practical application; the technical scheme of the invention has the advantages of simple steps, convenient operation, no pollution and the like; the product obtained by the invention is nontoxic and tasteless, has good smoothness, good softness and good tensile strength, and can adapt to automatic high-speed packaging of foods and medicines.
Detailed Description
The present invention will be further described with reference to the following specific examples.
Example 1
A preparation method of a regenerated cellulose/laponite nano material composite membrane comprises the following steps:
(1) preparation of an aqueous suspension of laponite: dispersing the laponite nano material in water, and dispersing at a high speed for 30min to obtain a uniform suspension, wherein the mass percentage of the laponite nano material is 2%;
(2) preparation of a 1-allyl-3-methylimidazolium chloride (AmimCl) ionic liquid suspension of laponite: adding the prepared water suspension of the laponite into an ionic liquid aqueous solution with the mass fraction of 60.0%, wherein the added amount of the laponite accounts for 0.05% of the mass percentage of the pure AmimCl, stirring and mixing for 30min, and then carrying out dewatering concentration treatment until the mass concentration of the ionic liquid aqueous solution is 95%;
(3) preparation of cellulose/laponite-ionic liquid solution: mixing a cellulose raw material with the concentrated AmimCl ionic liquid suspension of the laponite according to the mass percentage of 10 percent of cellulose, uniformly mixing, dehydrating, defoaming to dissolve the cellulose, and obtaining a uniform and transparent cellulose/laponite solution;
(4) and (3) film regeneration: conveying the uniform and transparent cellulose/laponite solution to a film spraying device, and spraying the solution into a coagulating bath with the mass percentage of ionic liquid of 10% and the temperature of 40 ℃ through a spraying seam of the film spraying device to prepare a film;
(5) and (3) post-treatment: and washing, plasticizing, drying and humidifying the regenerated cellulose membrane to obtain the regenerated cellulose/laponite nano material composite membrane.
The performance indexes of the regenerated cellulose/laponite nano material composite membrane obtained by the invention are detected, and the performance indexes of the obtained composite membrane are as follows: quantification: 41.5g/m2Moisture: 6.2%, longitudinal tensile strength: 49.5N/15mm, longitudinal elongation 19.4%, dry coefficient of friction: 0.087, wet coefficient of friction: 0.124, softness (machine/cross): 114/52. The detection criteria are as follows: the quantitative determination is carried out according to GB/T451.2 method for determining the quantitative determination of paper and paperboard; detecting the moisture according to GB/T462 paper and paperboard moisture determination; the tensile strength and the elongation are detected according to GB/T12914 determination of the tensile strength of paper and paperboard; the dry and wet friction coefficients are detected according to GB 10006 measuring method for friction coefficients of plastic films and sheets; the softness was measured according to GB/T8942 measurement of softness of paper.
Comparative example 1
A preparation method of a regenerated cellulose membrane without adding inorganic nano materials comprises the following steps:
(1) preparation of cellulose/1-allyl-3-methylimidazolium chloride (AmimCl) ionic liquid solution: mixing a cellulose raw material with 95% of AmimCl aqueous solution according to the proportion that the mass percentage of the cellulose is 10%, uniformly mixing, dehydrating, defoaming to dissolve the cellulose, and obtaining the uniform and transparent cellulose-AmimCl solution.
(2) And (3) film regeneration: and (3) conveying the uniform and transparent cellulose-AmimCl solution to a film spraying device, and spraying the solution into a coagulating bath with the mass percentage of the ionic liquid of 10% and the temperature of 40 ℃ through a spraying seam of the film spraying device to prepare a film.
(3) And (3) post-treatment: and washing, plasticizing, drying and humidifying the regenerated cellulose membrane to obtain the regenerated cellulose membrane.
Detecting the performance indexes of the regenerated cellulose membrane, wherein the performance indexes of the regenerated cellulose membrane are as follows: quantification: 41.0g/m2Moisture: 6.0%, longitudinal tensile strength: 47.5N/15mm, longitudinal elongation 20.1%, dry coefficient of friction: 0.3, wet coefficient of friction: 0.5, softness (machine/cross): 160/85. The detection criteria are as follows: the quantitative determination is carried out according to GB/T451.2 method for determining the quantitative determination of paper and paperboard; detecting the moisture according to GB/T462 paper and paperboard moisture determination; the tensile strength and the elongation are detected according to GB/T12914 determination of the tensile strength of paper and paperboard; the dry and wet friction coefficients are detected according to GB 10006 measuring method for friction coefficients of plastic films and sheets; the softness was measured according to GB/T8942 measurement of softness of paper.
By comparing example 1 with comparative example 1, the regenerated cellulose/nano material composite membrane obtained in example 1 of the present invention has improved tensile strength, and has good smoothness and softness.
Example 2
A preparation method of a regenerated cellulose/silicon dioxide nano material composite membrane comprises the following steps:
(1) preparation of aqueous suspensions of silica: dispersing the silicon dioxide nano material in water, and dispersing for 15min at a high speed to obtain a uniform suspension, wherein the mass percentage of the silicon dioxide nano material is 0.5%;
(2) preparation of a 1-butyl-3-methylimidazolium acetate (BmimAc) ionic liquid suspension of silica: adding the prepared water suspension of silicon dioxide into an ionic liquid aqueous solution with the mass fraction of 40.0%, wherein the adding amount of the silicon dioxide accounts for 0.15% of the mass percentage of the pure BmimAC, stirring and mixing for 50min, and then carrying out dewatering concentration treatment until the mass concentration of the ionic liquid aqueous solution is 98%;
(3) preparation of cellulose/silica-ionic liquid solution: mixing a cellulose raw material with the concentrated ionic liquid suspension of silicon dioxide according to the mass percentage of 15% of cellulose, and dehydrating and defoaming after uniformly mixing to dissolve cellulose to obtain a uniform and transparent cellulose/silicon dioxide solution;
(4) and (3) film regeneration: conveying the uniform and transparent cellulose/silicon dioxide solution to a film spraying device, and spraying the solution into a coagulating bath with the mass percentage of ionic liquid being 60% and the temperature being 60 ℃ through a spraying seam of the film spraying device to prepare a film;
(5) and (3) post-treatment: and washing, plasticizing, drying and humidifying the regenerated cellulose membrane to obtain the regenerated cellulose/silicon dioxide nano material composite membrane.
The performance indexes of the regenerated cellulose membrane/silicon dioxide nano composite material obtained by the invention are detected, and the performance indexes of the regenerated cellulose membrane/silicon dioxide nano composite material are as follows: quantification: 30.2g/m2Moisture: 6.0%, longitudinal tensile strength: 41.2N/15mm, longitudinal elongation 16.8%, dry coefficient of friction: 0.156, softness (machine/cross): 90/50. The detection criteria are as follows: the quantitative determination is carried out according to GB/T451.2 method for determining the quantitative determination of paper and paperboard; detecting the moisture according to GB/T462 paper and paperboard moisture determination; the tensile strength and the elongation are detected according to GB/T12914 determination of the tensile strength of paper and paperboard; the dry and wet friction coefficients are detected according to GB 10006 measuring method for friction coefficients of plastic films and sheets; the softness was measured according to GB/T8942 measurement of softness of paper.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and variations which do not require inventive efforts and are made by those skilled in the art are still within the scope of the present invention.
Claims (7)
1. An application of an inorganic nano material in improving the smoothness and softness of a cellulose membrane is characterized in that firstly, an aqueous suspension of the inorganic nano material is prepared and mixed with an ionic liquid aqueous solution, and then water is removed and concentrated; then mixing the concentrated ionic liquid suspension of the inorganic nano material with a cellulose raw material, and carrying out dehydration and defoaming treatment to obtain a uniform and transparent cellulose/inorganic nano material solution; and finally, regenerating the cellulose/inorganic nano material solution to obtain a regenerated cellulose/inorganic nano material composite membrane, which specifically comprises the following steps:
(1) preparing an aqueous suspension of inorganic nano materials: dispersing inorganic nano materials in water and mixing to obtain a uniform suspension, wherein the inorganic nano materials comprise nano clay and nano oxide;
(2) preparing ionic liquid suspension of inorganic nano materials: fully stirring the aqueous suspension of the inorganic nano material obtained in the step (1) and an ionic liquid aqueous solution, uniformly mixing, and then performing dewatering concentration treatment, wherein the ionic liquid is any one or combination of more of the following ionic liquids: 1-allyl-3-methylimidazole chloride salt, 1-ethyl-3-methylimidazole acetate, 1-butyl-3-methylimidazole acetate, 1-ethyl-3-methylimidazole chloride salt, 1-ethyl-3-methylimidazole bromide salt and 1-butyl-3-methylimidazole chloride salt;
(3) preparing a cellulose/inorganic nano material solution: mixing a cellulose raw material with the ionic liquid suspension of the inorganic nano material obtained in the step (2) according to a certain proportion, and dehydrating and defoaming after uniformly mixing to obtain a uniform and transparent cellulose/inorganic nano material solution;
(4) and (3) film regeneration: shaping the cellulose/inorganic nano material solution prepared in the step (3), and regenerating a film in a coagulating bath;
(5) and (3) post-treatment: and washing, plasticizing, drying and humidifying the regenerated cellulose membrane to obtain the regenerated cellulose/inorganic nano-material composite membrane.
2. The application of the inorganic nano material in improving the smoothness and softness of the cellulose membrane according to claim 1, wherein the mass percentage of the inorganic nano material in the suspension in the step (1) is 0.5-10%, the mixing is performed by high-speed mechanical stirring or ultrasonic stirring, the mixing temperature is 30-50 ℃, and the mixing time is 10-30 min.
3. The application of the inorganic nano material in improving the smoothness and softness of the cellulose membrane according to claim 1, wherein the mass concentration of the ionic liquid aqueous solution in the step (2) is 40-60%, the mass percentage of the inorganic nano material in the pure ionic liquid is 0.05-0.15%, and the stirring and mixing time is 10-60 min.
4. The application of the inorganic nanomaterial in improving the smoothness and softness of the cellulose membrane according to claim 1, wherein in the step (2), the dewatering concentration treatment is performed by adopting a vacuum heating mode, the water content of the ionic liquid suspension of the inorganic nanomaterial obtained after the dewatering concentration treatment is 2-10%, and the mass concentration of the ionic liquid aqueous solution is 90-98%.
5. The application of the inorganic nano material in improving the smoothness and softness of the cellulose membrane according to claim 1, wherein the cellulose raw material in the step (3) is 5-15% by mass, the mixing temperature is 30-60 ℃, and the mixing time is 20-50 min.
6. The application of the inorganic nano-material in improving the smoothness and softness of the cellulose membrane according to claim 1, wherein the ionic liquid suspension of the inorganic nano-material uniformly mixed in the step (3) is dehydrated and defoamed by vacuum heating.
7. The application of the inorganic nano material in improving the smoothness and softness of the cellulose membrane according to claim 1, wherein the coagulation bath in the step (4) is water or an aqueous solution of an ionic liquid, the temperature of the coagulation bath is 30-60 ℃, and the mass percentage of the ionic liquid in the aqueous solution of the ionic liquid is 0-60%.
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| CN103170255A (en) * | 2013-03-29 | 2013-06-26 | 华南理工大学 | Preparation method of nano-SiO2/cellulose composite separating membranes |
| CN103263896A (en) * | 2013-05-30 | 2013-08-28 | 新疆大学 | Cellulose-based polymer/montmorillonite nano composite adsorption material and preparation method thereof |
| WO2016077755A1 (en) * | 2014-11-13 | 2016-05-19 | Ohio State Innovation Foundation | Membranes for fluid separation |
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| JP2009143830A (en) * | 2007-12-12 | 2009-07-02 | Nippon Kenko Kagaku Kenkyu Center:Kk | Cooling film pharmaceutical preparation |
| CN104610557B (en) * | 2013-11-01 | 2018-03-02 | 中国科学院化学研究所 | A kind of regenerated cellulose film, functional membrane and preparation method thereof |
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| CN103170255A (en) * | 2013-03-29 | 2013-06-26 | 华南理工大学 | Preparation method of nano-SiO2/cellulose composite separating membranes |
| CN103263896A (en) * | 2013-05-30 | 2013-08-28 | 新疆大学 | Cellulose-based polymer/montmorillonite nano composite adsorption material and preparation method thereof |
| WO2016077755A1 (en) * | 2014-11-13 | 2016-05-19 | Ohio State Innovation Foundation | Membranes for fluid separation |
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