CN112080155B - Preparation method of recycled paperboard fiber-based composite molded product - Google Patents
Preparation method of recycled paperboard fiber-based composite molded product Download PDFInfo
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Abstract
The invention discloses a preparation method of a fiber-based composite molded product of recycled paper boards, which is characterized in that the recycled paper boards are used as main materials, polyvinyl alcohol, hydroxypropyl methyl cellulose, four-arm polyethylene glycol hydroxyl, starch and poly epsilon-caprolactone particles are added, and the mixture is mixed, dried and molded by a molding press.
Description
Technical Field
The invention relates to the field of printing and packaging, in particular to a preparation method of a recycled paperboard fiber-based composite molded product.
Background
The existing molded products mainly take plastic materials such as PE, PP, PS and the like, and have the advantages of good mechanical property, simple processing condition, long service life and obvious advantages. The wood-plastic composite material is prepared by mixing wood powder and plastic, has certain degradability, but the plastic cannot be degraded, and the wood powder is degraded to cause fragmentation of the plastic and environmental pollution. China highly attaches importance to environmental problems caused by plastics, strict plastic forbidding orders are issued in succession in 1 month and 7 months in 2020, and the use of plastic packaging products is forbidden, so that high requirements are provided for degradable material substitutes of plastics. Various biomass degradable bases are used in this field of development, such as starch, vegetable fibers, biopolyesters such as polylactic acid, and the like.
Along with the rapid development of express delivery, a large amount of carton cartons are used for express delivery packing in the society at present, simultaneously because its recovery recycles the not enough of technique, leads to a large amount of carton packing to be abandoned at will, has also aroused the problem of environment. How to efficiently and scientifically utilize the express paper package to develop a novel material is one of important ways for treating express package pollution. The cardboard is composed of paper fiber, and the recycled cardboard is used as a product independently, which has great difficulty, on one hand, the vegetable fiber is insoluble and infusible, the processing fluidity is very poor, and on the other hand, the problem that the uniform and tight combination of the vegetable fiber is realized to improve the strength of the product is also solved. Among the various processing methods, molding is the most suitable method for treating fibers, does not require long-distance displacement and mutual agglomeration during flow, and does not cause processing difficulties due to differences in flow properties between other materials, but the problem of molding is still solved if the bonding strength of the fibers is improved. There are several attempts to solve this problem, such as adding more adhesive resins with good flowability, such as EVA, LLDPE, etc., but this is costly and the degradable components are reduced, such as increasing the molding pressure and simultaneously compacting to increase the strength, but this results in an increase in the density of the article and thus the cost. The preparation method of the molded product which has high strength, low cost and environmental protection property is searched, the application range and the application value of the plant fiber are greatly improved, and the problem of recycling the recycled paperboard is solved. The invention develops a preparation method of a recycled paperboard fiber-based composite molded product, which realizes good performance, full degradability and low density by matching a formula, raw material treatment and a molding process, and is beneficial to popularization of the molding process.
Disclosure of Invention
The invention mainly aims to overcome the problems of poor performance and high cost of the molded products prepared from the recycled paperboards, and provides a preparation method of a recycled paperboard fiber-based composite molded product of the molded product, which takes the recycled paperboards as main raw materials and has the characteristics of high strength, complete degradation and low density.
A method for preparing fiber-based composite die pressing products of recycled paper boards comprises the steps of taking recycled paper boards as main materials, adding polyvinyl alcohol, hydroxypropyl methyl cellulose, four-arm polyethylene glycol hydroxyl, starch and poly epsilon-caprolactone particles, mixing, drying, and then carrying out die pressing by a die pressing machine to obtain the product; the preparation method comprises the following steps:
1) Putting the recycled paper board into a crusher for crushing, and screening fibers with the particle size of less than 600 meshes to obtain recycled paper board fibers;
2) Putting the recycled cardboard fibers into water to prepare a suspension with the mass concentration of 8-12%, heating to 40-50 ℃, adding a complex enzyme of cellulase and pectinase, uniformly stirring, standing for 20-40 minutes, cooling to 15-25 ℃, adding laccase, uniformly stirring, standing for 20-40 minutes, washing, and filtering to obtain a wet fiber material; the adding amount of the cellulase, the pectinase and the laccase is between 6-12U/g, 4-8U/g and 20-40U/g by taking the quality of the fiber as a standard;
3) Adding starch into deionized water to prepare 4-8% emulsion, sealing, heating in boiling water bath for 30min to fully gelatinize starch, cooling to 40 ℃, adjusting the pH value of the starch paste to 4.5-5, adding pullulanase, uniformly mixing, carrying out debranching treatment in a water bath shaker at 55-60 ℃ at a speed of 100-200rmp for 5-10min, inactivating enzyme in boiling water bath for 30min after treatment, evaporating water to improve the concentration of the gelatinized liquid to 15-20%, adjusting the pH value of the gelatinized liquid to neutral, cooling to room temperature, cleaning, and standing for 10-20min to obtain the treated starch gelatinized liquid for later use; wherein the addition amount of pullulanase is 20-40U/g;
4) Mixing the wet fiber material, the starch pasting solution, the hydroxypropyl methyl cellulose aqueous solution, the four-arm polyethylene glycol hydroxyl aqueous solution, the polyvinyl alcohol aqueous solution and the poly epsilon-caprolactone particles, stirring at the speed of 200-300rmp for 5-10 minutes until the slurry is uniform, and then evaporating to dryness at the temperature of 50-60 ℃ until the water content of the material is between 30-50% to obtain a processed material for later use; wherein, the concentrations of the hydroxypropyl methyl cellulose aqueous solution, the four-arm polyethylene glycol hydroxyl aqueous solution and the polyvinyl alcohol aqueous solution are respectively between 15-25%, 20-30% and 10-20%.
5) Heating the processed materials to 80 ℃, putting the heated materials into a mould press, setting the temperature of the mould to be 95-115 ℃, setting the pressure to be 6.5-8.5MPa, and carrying out mould pressing for 4-6 minutes to obtain the product.
Preferably, the mold is provided with vent holes, and the distance between every two adjacent vent holes is 15cm-30 cm.
Preferably, the wet fiber material may be subjected to a bleaching or dyeing process to impart different colors.
The preparation method of the recycled paperboard fiber-based composite molded product has the beneficial effects that:
1. the paper fiber is further homogenized and recovered through a special enzyme treatment process, so that the damage to fiber cell walls is improved, and the combination between fibers and between the fibers and other components is improved; the starch after enzyme treatment plays a role in binding and filling in the product, and the combination between amylose and fiber can improve the contribution of the fiber to the strength so as to improve the toughness of the product;
2. the hydroxypropyl methyl cellulose is homologous with plant fiber and starch, has water solubility, and can be easily combined to play a role in binding a matrix.
3. The four-arm polyethylene glycol hydroxyl has a large number of hydroxyl groups and a star-shaped chemical structure, and can effectively connect all components in the matrix, thereby being beneficial to improving the strength and toughness of the matrix; when a large amount of water in the prepressed matrix is evaporated and the mould pressing process is carried out at high temperature, the polyvinyl alcohol is separated out from the matrix and is uniformly dispersed and bonded with the matrix.
4. The low-melting poly epsilon-caprolactone has fluidity at the mould pressing temperature, so that the fluidity of the matrix is effectively improved, the uniformity of the matrix is facilitated, and the function of adhering the matrix is also realized.
Drawings
FIG. 1 is a process flow diagram of a method of making a recycled paperboard fiber-based composite molded article of the present invention;
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, an embodiment of the method of making a recycled paperboard fiber-based composite molded article of the present invention is presented:
a recycled paperboard fiber-based composite die-pressed product comprises the following raw materials in parts by weight:
64 portions of recycled paperboard fiber
6.5 parts of polyvinyl alcohol
Hydroxypropyl methylcellulose 2.4 parts
2.6 parts of four-arm polyethylene glycol hydroxyl
21 portions of starch
6.2 parts of poly-epsilon-caprolactone
The wet fiber material is bleached to form white.
The recycled paper board is a mixture of recycled corrugated paper board and honeycomb paper board in a proportion of 50 percent
The starch is corn starch.
The degree of substitution of hydroxypropylmethylcellulose was 1.2.
The molecular weight of the four-arm polyethylene glycol hydroxyl group is 8000.
The molecular weight of the polyvinyl alcohol is 25000.
The molecular weight of poly-epsilon-caprolactone is 150000.
The preparation method comprises the following steps:
(1) Putting the recycled paper board into a crusher for crushing, and screening fibers with the particle size of less than 600 meshes to obtain recycled paper board fibers;
(2) Putting the recycled paperboard fibers into water to prepare a suspension with the mass concentration of 10%, heating to 45 ℃, adding a complex enzyme of cellulase and pectinase, uniformly stirring, standing for 30 minutes, cooling to 20 ℃, adding laccase, uniformly stirring, standing for 25 minutes, washing, and filtering to obtain a wet fiber material; the adding amount of the cellulase, the pectinase and the laccase is 8.4U/g, 6.2U/g and 30U/g by taking the quality of the fiber as a standard;
(3) Adding starch into deionized water to prepare an emulsion with the mass fraction of 6.5%, sealing, heating in a boiling water bath for 30min to fully gelatinize the starch, cooling to 40 ℃, adjusting the pH value of the starch paste to 4.8, adding pullulanase, uniformly mixing, carrying out debranching treatment in a water bath shaking table at the temperature of 58 ℃ for 8min at the speed of 150rmp, inactivating the enzyme in the boiling water bath for 30min after the treatment is finished, evaporating water to improve the concentration of the gelatinized liquid to 17.5%, adjusting the pH value of the gelatinized liquid to be neutral, cooling to room temperature, and standing for 15min to obtain the treated starch gelatinized liquid for later use; wherein the adding amount of the pullulanase is 35U/g;
(4) Mixing the wet fiber material, starch pasting liquid, hydroxypropyl methyl cellulose aqueous solution, four-arm polyethylene glycol hydroxyl aqueous solution, polyvinyl alcohol aqueous solution and poly epsilon-caprolactone particles, stirring at the rate of 250rmp for 7 minutes until the slurry is uniform, and then evaporating water at the temperature of 55 ℃ until the water content of the material is 45% to obtain a processed material for later use; wherein, the concentrations of the hydroxypropyl methyl cellulose aqueous solution, the four-arm polyethylene glycol hydroxyl aqueous solution and the polyvinyl alcohol aqueous solution are respectively 18.5 percent, 25 percent and 12.5 percent;
(5) Heating the processed material to 80 ℃, putting the heated processed material into a mould press, setting the temperature of the mould to be 100 ℃ and the pressure to be 7.5MPa, and carrying out mould pressing for 5 minutes to obtain the product.
The mold used for mold pressing in the preparation process is provided with vent holes, and the distance between every two adjacent vent holes is 25cm.
The molded articles prepared by this example were tested for mechanical properties by proofing and had the following properties:
| density of | Tensile strength | Impact strength | Compressive strength |
| 0.84Kg/m3 | 32.5MPa | 4.6KJ/m2 | 41.5MPa |
Referring to fig. 1, another embodiment of the method of making a recycled paperboard fiber-based composite molded article of the present invention is presented:
a recycled paperboard fiber-based composite die-pressed product comprises the following raw materials in parts by weight:
68.5 portions of recycled paperboard fiber
Polyvinyl alcohol 7.2 parts
Hydroxypropyl methylcellulose 2.6 parts
2.8 parts of four-arm polyethylene glycol hydroxyl
18.5 portions of starch
5.5 parts of poly-epsilon-caprolactone
The wet fiber material is bleached and dyed green.
The recycled paper board is 70% of corrugated paper board and 30% of box board.
The starch is tapioca starch.
The degree of substitution of hydroxypropylmethylcellulose was 0.9.
The molecular weight of the four-arm polyethylene glycol hydroxyl group is 9500.
The molecular weight of the polyvinyl alcohol is 32000.
The molecular weight of poly-epsilon-caprolactone is 180000.
The preparation method comprises the following steps:
(1) Putting the recycled paper board into a crusher for crushing, and screening fibers with the particle size of less than 600 meshes to obtain recycled paper board fibers;
(2) Putting recycled paperboard fibers into water to prepare a suspension with the mass concentration of 9%, heating to 48 ℃, adding a complex enzyme of cellulase and pectinase, uniformly stirring, standing for 35 minutes, cooling to 24 ℃, adding laccase, uniformly stirring, standing for 35 minutes, washing, and filtering to obtain a wet fiber material; the adding amount of the cellulase, the pectinase and the laccase is between 10.5U/g, 5.5U/g and 35U/g by taking the quality of the fiber as a standard;
(3) Adding starch into deionized water to prepare an emulsion with the mass fraction of 6%, sealing, heating in a boiling water bath for 30min to fully gelatinize the starch, cooling to 40 ℃, adjusting the pH value of the starch paste to 4.6, adding pullulanase, uniformly mixing, then carrying out debranching treatment in a 58 ℃ water bath shaking table at the speed of 180rmp for 7min, inactivating the enzyme in the boiling water bath for 30min after the treatment is finished, evaporating water to improve the concentration of the gelatinized liquid to 18%, adjusting the pH value of the gelatinized liquid to be neutral, cooling to room temperature, and then placing for 15min to obtain the treated starch gelatinized liquid for later use; wherein the addition amount of the pullulanase is 32U/g;
(4) Mixing the wet fiber material, the starch pasting solution, the hydroxypropyl methyl cellulose aqueous solution, the four-arm polyethylene glycol hydroxyl aqueous solution, the polyvinyl alcohol aqueous solution and the poly epsilon-caprolactone particles, stirring at the speed of 240rmp for 8 minutes until the slurry is uniform, and then further evaporating water to dryness at 55 ℃ until the water content of the material is 42% to obtain a processed material for later use; wherein, the concentrations of the hydroxypropyl methyl cellulose aqueous solution, the four-arm polyethylene glycol hydroxyl aqueous solution and the polyvinyl alcohol aqueous solution are respectively 18.5 percent, 26.5 percent and 15.5 percent;
(5) Heating the processed materials to 80 ℃, putting the heated materials into a mould press, setting the mould temperature to 105 ℃, the pressure to 7.8MPa, and carrying out mould pressing for 5.5 minutes to obtain the product.
The mold used for mold pressing in the preparation process is provided with vent holes, and the distance between every two adjacent vent holes is 20cm.
The molded articles prepared by this example, after being tested for mechanical properties by sample testing, had the following properties:
| density of | Tensile strength | Impact strength | Compressive strength | Elongation at break |
| 0.92Kg/m3 | 28.4MPa | 3.9KJ/m2 | 36.8MPa | 192.7％ |
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the specification and drawings, or any other related technical fields, are all included in the scope of the present invention.
Claims (3)
1. A preparation method of a recycled paperboard fiber-based composite molded product is characterized in that the recycled paperboard fiber-based composite molded product takes a recycled paperboard as a main material, and is formed by adding polyvinyl alcohol, hydroxypropyl methyl cellulose, four-arm polyethylene glycol hydroxyl, starch and poly epsilon-caprolactone particles, mixing, drying and then molding by a molding press; the preparation method comprises the following steps:
1) Putting the recycled paper board into a crusher for crushing, and screening fibers with the particle size of less than 600 meshes to obtain recycled paper board fibers;
2) Putting the recycled cardboard fibers into water to prepare a suspension with the mass concentration of 8-12%, heating to 40-50 ℃, adding a complex enzyme of cellulase and pectinase, uniformly stirring, standing for 20-40 minutes, cooling to 15-25 ℃, adding laccase, uniformly stirring, standing for 20-40 minutes, washing, and filtering to obtain a wet fiber material; the adding amount of cellulase, pectinase and laccase is 6-12U/g, 4-8U/g and 20-40U/g based on the quality of the fiber;
3) Adding starch into deionized water to prepare 4-8% emulsion, sealing, heating in boiling water bath for 30min to fully gelatinize starch, cooling to 40 ℃, adjusting the pH value of the starch paste to 4.5-5, adding pullulanase, uniformly mixing, carrying out debranching treatment in a water bath shaker at 55-60 ℃ at a speed of 100-200rmp for 5-10min, inactivating enzyme in boiling water bath for 30min after treatment, evaporating water to improve the concentration of the gelatinized liquid to 15-20%, adjusting the pH value of the gelatinized liquid to neutral, cooling to room temperature, cleaning, and standing for 10-20min to obtain the treated starch gelatinized liquid for later use; wherein the addition amount of pullulanase is 20-40U/g;
4) Mixing the wet fiber material, starch pasting liquid, hydroxypropyl methyl cellulose aqueous solution, four-arm polyethylene glycol hydroxyl aqueous solution, polyvinyl alcohol aqueous solution and poly epsilon-caprolactone particles, stirring at the speed of 200-300rmp for 5-10 minutes until the slurry is uniform, and then evaporating water to dryness at the temperature of 50-60 ℃ until the water content of the material is between 30-50% to obtain a processed material for later use; wherein, the concentrations of the hydroxypropyl methyl cellulose aqueous solution, the four-arm polyethylene glycol hydroxyl aqueous solution and the polyvinyl alcohol aqueous solution are respectively between 15-25%, 20-30% and 10-20%;
5) Heating the processed material to 80 ℃, putting the heated material into a mould press, setting the temperature of the mould to be 95-115 ℃, setting the pressure to be 6.5-8.5MPa, and carrying out mould pressing for 4-6 minutes to obtain the product.
2. The method of claim 1, wherein the mold is provided with vent holes, and the distance between adjacent vent holes is between 15cm and 30 cm.
3. The method of making a recycled paperboard fiber-based composite molded article of claim 1, wherein the wet fiber stock is subjected to a bleaching or dyeing process to impart different colors.
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| CN114381135A (en) * | 2021-12-15 | 2022-04-22 | 淮安金利达包装有限公司 | Degradable environment-friendly fiber packaging material and manufacturing process thereof |
| CN115807354B (en) * | 2022-12-19 | 2023-12-08 | 湖南工业大学 | Efficient treatment mode of plant fibers and preparation process of molded material of efficient treatment mode |
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