CN113059885B - Preparation method of moso bamboo fiber bundle reinforced plastic-suction forming packaging container - Google Patents
Preparation method of moso bamboo fiber bundle reinforced plastic-suction forming packaging container Download PDFInfo
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- CN113059885B CN113059885B CN202110288360.6A CN202110288360A CN113059885B CN 113059885 B CN113059885 B CN 113059885B CN 202110288360 A CN202110288360 A CN 202110288360A CN 113059885 B CN113059885 B CN 113059885B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B11/00—Making preforms
- B29B11/14—Making preforms characterised by structure or composition
- B29B11/16—Making preforms characterised by structure or composition comprising fillers or reinforcement
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/10—Forming by pressure difference, e.g. vacuum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
- B32B37/1284—Application of adhesive
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
- D06M13/322—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing nitrogen
- D06M13/46—Compounds containing quaternary nitrogen atoms
- D06M13/463—Compounds containing quaternary nitrogen atoms derived from monoamines
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/643—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds containing silicon in the main chain
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
- D21H11/20—Chemically or biochemically modified fibres
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
- D21J7/00—Manufacture of hollow articles from fibre suspensions or papier-mâché by deposition of fibres in or on a wire-net mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/306—Resistant to heat
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/02—Natural fibres, other than mineral fibres
- D06M2101/04—Vegetal fibres
- D06M2101/06—Vegetal fibres cellulosic
Abstract
The invention discloses a preparation method of a moso bamboo fiber bundle reinforced plastic uptake forming packaging container, which comprises the following steps: rinsing and sterilizing the long bamboo fibers of the moso bamboo, putting the fibers into a compound softening agent for hydrophobic softening treatment, and adding polyethylene terephthalate fibers, polyacrylamide, polyglycerol caprylate and water to prepare a modified bamboo fiber suspension; carrying out reciprocating vibration and ultrasonic treatment on the modified bamboo fiber suspension, attaching the modified bamboo fiber suspension to a forming filter screen, filtering water, vacuumizing the lower part of the formed filter screen, and dehydrating to obtain a modified fiber thin felt; heating and rolling the modified fiber mat and the polyethylene terephthalate film in a hot-melt impregnator to prepare a bamboo fiber reinforced plastic-absorbing sheet; and then, carrying out secondary heating by adopting a continuous feeding plastic uptake process, and then preparing the bamboo fiber reinforced plastic uptake packaging container by utilizing a vacuum adsorption process. The moso bamboo fiber bundle reinforced plastic-suction forming packaging container prepared by the invention has the characteristics of good heat resistance and compactness, high strength, environmental protection and no pollution.
Description
Technical Field
The invention belongs to the technical field of green fiber materials, and particularly relates to a preparation method of a moso bamboo fiber bundle reinforced plastic-suction forming packaging container.
Background
With the prohibition of producing and selling disposable plastic packaging materials such as ultrathin plastic shopping bags, foamed plastic tableware and the like nationwide, the main purpose of the method is to enhance environmental protection and reduce damage to ecology caused by disposable plastics, and the implementation of 'plastic forbidden' will undoubtedly lead the packaging materials to be newly changed.
A method for manufacturing the product with plastic shell with opening by vacuum sucking moulding technique features that after the plastic sheet is cut to a certain size and heated for softening, it is deformed by the pressure difference between two surfaces of the sheet and mechanical pressure, then it is applied to the contour surface of mould, cooled for shaping, and after trimming, the sucking moulding is finished. With the rapid development of electronic and packaging industries in recent years, the demand of plastic boards and sheets in domestic markets is continuously increasing at a rate of 12% per year. At present, the synthetic resins used for producing plastic plates and sheets in China mainly comprise polyvinyl chloride (PVC), polypropylene (PP), Polystyrene (PS), Polyethylene (PE), polyethylene terephthalate (PET) and the like. However, those packaging materials such as PVC, which are difficult to recycle and environmentally hazardous, have begun to restrict their use in many countries; PS releases toxic gases when burned, while PET is relatively expensive. With the implementation of "forbidden plastic" and the enhancement of environmental awareness of human beings, the influence of packaging materials on the environment is also widely concerned by people. Therefore, a novel low-cost environment-friendly material is developed, and is applied to the fields of logistics, food entrustment, electronic industry and the like instead of plastics in a large quantity, and the reduction of the environmental pollution caused by plastic products is urgent.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of a moso bamboo fiber bundle reinforced plastic-suction forming packaging container aiming at the defects of the prior art. The method takes bamboo fiber as a raw material and modifies the bamboo fiber to be suitable for a plastic suction molding technology, and the prepared moso bamboo fiber bundle reinforced plastic suction molding packaging container has stronger heat resistance and strength and is an environment-friendly, ecological, degradable and sustainable container.
In order to solve the technical problems, the invention adopts the technical scheme that: a preparation method of a moso bamboo fiber bundle reinforced plastic uptake forming packaging container is characterized by comprising the following steps:
step one, bamboo fiber modification: rinsing and sterilizing the long moso bamboo fibers, putting the long moso bamboo fibers into a compound softening agent for hydrophobic softening treatment for 30-40 min under the conditions that the temperature is 40-50 ℃ and the stirring speed is 2000-3000 r/min, and then adding the long moso bamboo fibers, water a, polyethylene terephthalate fibers, polyacrylamide and polyglycerol caprylate into the compound softening agent according to the mass ratio of 100: 1000: (5-9): (2-6): (8-12) adding water a, polyethylene terephthalate fibers, polyacrylamide and polyglycerol caprylate, uniformly mixing, and finally adjusting the pH value to 4-6 to prepare a modified bamboo fiber suspension;
the compound softening agent consists of water b, dimethyl silicone oil and an emulsifier, and the mass ratio of the long bamboo fibers of the moso bamboos to the water b, the dimethyl silicone oil and the emulsifier in the hydrophobic softening treatment process is 100: 1000: (5-9): (10-15);
step two, preparing the modified bamboo fiber thin felt: simultaneously carrying out mechanical reciprocating vibration and ultrasonic treatment on the modified bamboo fiber suspension liquid in the step one, then uniformly attaching the modified bamboo fiber suspension liquid on a forming filter screen to form a wet fiber thin felt, and sequentially carrying out water filtration, lower part vacuumizing and directional dehydration to obtain the modified bamboo fiber thin felt;
step three, preparing the bamboo fiber reinforced plastic sheet: heating, rolling and compounding the modified bamboo fiber mat and the polyethylene terephthalate film coated with the coupling agent by using a hot melting impregnator, and keeping the temperature to obtain a bamboo fiber reinforced plastic-absorbing sheet;
step four, preparing the bamboo fiber reinforced plastic packaging container: and (4) carrying out secondary heating on the bamboo fiber reinforced plastic-absorbing sheet in the step three by adopting a continuous feeding plastic-absorbing process, and then manufacturing the bamboo fiber reinforced plastic-absorbing packaging container by utilizing a vacuum adsorption process.
The preparation method of the moso bamboo fiber bundle reinforced plastic-suction forming packaging container is characterized in that in the step one, the emulsifier is an anionic emulsifier or a cationic emulsifier, the anionic emulsifier is potassium lauryl phosphate, and the cationic emulsifier is hexadecyl trimethyl ammonium chloride or octadecyl trimethyl ammonium chloride.
The preparation method of the moso bamboo fiber bundle reinforced plastic-suction forming packaging container is characterized in that the solid content of the modified bamboo fiber suspension in the step one is 70-80%.
The preparation method of the moso bamboo fiber bundle reinforced plastic molding packaging container is characterized in that in the second step, the ultrasonic treatment frequency is 20KHz-130KHz, the oscillation frequency is 30r/min-300r/min, and the treatment time is 5min-10 min; the surface density of the modified bamboo fiber thin felt is 50g/m2-250g/m2The thickness is 5mm-20mm, and the water content is less than 10%.
The preparation method of the moso bamboo fiber bundle reinforced plastic uptake forming packaging container is characterized in that in the third step, the mass fraction of the polyethylene terephthalate film in the bamboo fiber reinforced plastic uptake sheet is 15-30%; the coating amount of the coupling agent is 3% of the mass of the polyethylene terephthalate film, and the coupling agent is a silane coupling agent or a nano-silver modified silane coupling agent; the feeding speed of the hot melting impregnator is 2m/min, the rolling temperature is 110-200 ℃, and the rolling pressure is 0.2-0.3 MPa.
The preparation method of the moso bamboo fiber bundle reinforced plastic uptake forming packaging container is characterized in that the performance of the bamboo fiber reinforced plastic uptake sheet material in the third step is as follows: the density was 0.5g/cm3-0.7g/cm3The internal bonding strength is more than or equal to 0.2MPa, the elongation at break is 50-100%, the bending strength is 20-40 MPa, and the molding compression ratio is less than 5%.
The preparation method of the moso bamboo fiber bundle reinforced plastic molding packaging container is characterized in that in the fourth step, the secondary heating temperature is 150-220 ℃, and the heating time is 5-10 s.
The preparation method of the moso bamboo fiber bundle reinforced blister forming packaging container is characterized in that the bamboo fiber reinforced blister packaging container in the fourth step is a bamboo fiber reinforced blister lunch box.
The performance of the prepared moso bamboo fiber bundle reinforced plastic molding packaging container is as follows: the folding strength is more than or equal to 80 times, and the impact strength of the notch of the simply supported beam is 6-9kJ/m2(ii) a Physical and chemical properties: the performances of the dropping performance, the water leakage performance, the hot water resistance, the hot oil resistance, the soaking solution and the like reach the standard requirements; heavy metals (calculated as Pb, 4% acetic acid, volume fraction, 60 ℃, 2h) < 2mg/kg, fluorescent substances (254nm and 365nm) are negative, and microorganisms including coliform bacteria and salmonella (/50 cm)2) No mould (CFU/g) < 10 was detected.
Compared with the prior art, the invention has the following advantages:
1. the modified bamboo fiber thin felt is mixed with polyethylene terephthalate fiber when the long bamboo fiber of the moso bamboo is modified, so that the bonding property of the interface of the modified bamboo fiber thin felt and the polyethylene terephthalate fiber thin film is improved, and the heat resistance and the absorbability of the prepared bamboo fiber reinforced plastic-absorbing sheet are ensured.
2. According to the invention, the bamboo fiber thin felt and the polyethylene terephthalate fiber film are compounded into the felt, so that the prepared bamboo fiber reinforced plastic uptake sheet has better uniformity, ductility and strength.
3. The invention adopts the moso bamboo as the raw material, develops a novel environment-friendly packaging container and reduces the pollution to the environment.
The technical solution of the present invention will be described in further detail by examples.
Detailed Description
Example 1
The preparation method of the moso bamboo fiber bundle reinforced plastic molding packaging container (lunch box) comprises the following steps:
step one, bamboo fiber modification: the method comprises the following steps of taking moso bamboos as raw materials, preparing the moso bamboo long bamboo fibers by adopting the method disclosed in the patent name 'preparation method of long bamboo fibers for molding composite materials (application number 202010385470. X'), rinsing and sterilizing, putting 100 parts of the moso bamboo long bamboo fibers into a compound softening agent for hydrophobic softening treatment, wherein the proportion of each component of the compound softening agent to the moso bamboo long bamboo fibers is as follows: the mass ratio of the long bamboo fibers of the moso bamboo, the water b, the dimethyl silicone oil and the hexadecyl trimethyl ammonium chloride is 100: 1000: 7: 15, the temperature of hydrophobic softening treatment is 40 ℃, the time is 40min, and the stirring speed is 2500 r/min; after softening treatment, according to the mass ratio of the long bamboo fibers of the moso bamboo, water a, polyethylene terephthalate fibers, polyacrylamide and polyglycerol caprylate of 100: 1000: 9: 3: 10, adding polyethylene terephthalate fiber, polyacrylamide, polyglycerol caprylate and water a, continuously stirring, and then adjusting the pH value to 6 to prepare modified bamboo fiber suspension with the solid content of 75%;
step two, preparing the modified bamboo fiber thin felt: simultaneously carrying out mechanical reciprocating vibration with the oscillation frequency of 300r/min and ultrasonic treatment with the ultrasonic frequency of 70KHz on the modified bamboo fiber suspension liquid obtained in the step one, wherein the treatment time is 7min, then moving a forming filter screen, uniformly attaching the forming filter screen to the filter screen to form a wet fiber mat, and sequentially carrying out water filtration, lower part vacuum pumping and directional dehydration to obtain the modified bamboo fiber mat, wherein the surface density of the modified bamboo fiber mat is 250g/m2The thickness is 5mm, and the water content is lower than 10 percent;
step three, preparing the bamboo fiber reinforced plastic sheet: rolling and compounding the modified bamboo fiber mat and the polyethylene terephthalate film coated with the silane coupling agent in the second step, then performing heating and rolling compounding by a hot melt impregnator under the conditions that the feeding speed is 2m/min, the rolling temperature is 150 ℃ and the rolling pressure is 0.2MPa, and keeping the temperature to prepare the bamboo fiber reinforced plastic uptake sheet; the coating amount of the coupling agent is 3% of the mass of the polyethylene terephthalate film, and the mass fraction of the polyethylene terephthalate film in the bamboo fiber reinforced plastic sheet is 15%;
step four, preparing the bamboo fiber reinforced plastic packaging container: and (3) carrying out secondary heating on the bamboo fiber reinforced plastic-absorbing sheet prepared in the step three under the conditions that the temperature is 180 ℃ and the heating time is 6s by adopting a continuous feeding plastic-absorbing process, then manufacturing the bamboo fiber reinforced plastic-absorbing lunch box by utilizing a vacuum adsorption process, and finally carrying out air cooling, demolding, post-treatment, cutting and trimming to obtain a finished product of the moso bamboo fiber bundle reinforced plastic-absorbing formed lunch box.
The performance of the bamboo fiber reinforced plastic sheet prepared by the embodiment is as follows: the density was 0.6g/cm3The internal bonding strength is more than or equal to 0.2MPa, the elongation at break is 75%, the bending strength is 25MPa, and the molding compression ratio is less than 5%.
The performance of the finished product of the plastic uptake forming lunch box reinforced by the moso bamboo fiber bundles prepared by the embodiment is as follows: the folding strength is more than or equal to 100 times, and the impact strength of the simply supported beam notch is 7kJ/m2(ii) a Physical and chemical properties: the performances of the dropping performance, the water leakage performance, the hot water resistance, the hot oil resistance, the soaking solution and the like reach the standard requirements; heavy metals (calculated as Pb, 4% acetic acid, volume fraction, 60 ℃, 2h) < 2mg/kg, fluorescent substances (254nm and 365nm) are negative.
Example 2
This example is the same as example 1, except that: in the first step, the emulsifier is an anionic emulsifier or a cationic emulsifier, the anionic emulsifier is potassium lauryl phosphate, and the cationic emulsifier is octadecyl trimethyl ammonium chloride.
Example 3
The preparation method of the moso bamboo fiber bundle reinforced plastic molding packaging container (lunch box) comprises the following steps:
step one, bamboo fiber modification: the method comprises the following steps of taking moso bamboos as raw materials, preparing the moso bamboo long bamboo fibers by adopting the method disclosed in the patent name 'preparation method of long bamboo fibers for molding composite materials (application number 202010385470. X'), rinsing and sterilizing, putting 100 parts of the moso bamboo long bamboo fibers into a compound softening agent for hydrophobic softening treatment, wherein the proportion of each component of the compound softening agent to the moso bamboo long bamboo fibers is as follows: the mass ratio of the long bamboo fibers of the moso bamboo to the water b to the dimethyl silicone oil to the octadecyl trimethyl ammonium chloride is 100: 1000: 9: 13, the temperature of hydrophobic softening treatment is 50 ℃, the time is 30min, and the stirring speed is 2000 r/min; after softening treatment, according to the mass ratio of the long bamboo fibers of the moso bamboo, water a, polyethylene terephthalate fibers, polyacrylamide and polyglycerol caprylate of 100: 1000: 5: 6: 8, adding polyethylene terephthalate fiber, polyacrylamide, polyglycerol caprylate and water a in proportion, continuously stirring, and then adjusting the pH value to 5 to prepare a modified bamboo fiber suspension with the solid content of 70 percent;
step two, preparing the modified bamboo fiber thin felt: simultaneously carrying out mechanical reciprocating vibration with oscillation frequency of 30r/min and ultrasonic treatment with ultrasonic frequency of 130KHz on the modified bamboo fiber suspension liquid obtained in the step one, wherein the treatment time is 5min, then moving a forming filter screen, uniformly attaching the forming filter screen to the filter screen to form a wet fiber mat, and sequentially carrying out water filtration, lower part vacuum pumping and directional dehydration to obtain the modified bamboo fiber mat, wherein the surface density of the modified bamboo fiber mat is 150g/m2The thickness is 20mm, and the water content is lower than 10 percent;
step three, preparing the bamboo fiber reinforced plastic sheet: rolling and compounding the modified bamboo fiber mat obtained in the step two and a nano silver polyethylene terephthalate film coated with a nano silver modified silane coupling agent (commercially available), then heating and rolling and compounding by a hot melt impregnator under the conditions that the feeding speed is 2m/min, the rolling temperature is 200 ℃ and the rolling pressure is 0.3MPa, and keeping the temperature to obtain the bamboo fiber reinforced plastic-absorbing sheet; the coating amount of the coupling agent is 3% of the mass of the polyethylene terephthalate film, and the mass fraction of the polyethylene terephthalate film in the bamboo fiber reinforced plastic sheet is 30%;
the specific process for preparing the nano silver polyethylene terephthalate fiber comprises the following steps: mixing polyethylene terephthalate fiber, distilled water and nano silver according to the mass ratio of 120:1000:5, stirring at a high speed under the conditions of 80 ℃ and 2000r/min of rotation speed, reacting for 30min, and then carrying out suction filtration and drying to obtain the nano silver polyethylene terephthalate fiber.
Step four, preparing the bamboo fiber reinforced plastic packaging container: and (3) carrying out secondary heating on the bamboo fiber reinforced plastic-absorbing sheet prepared in the step three under the conditions that the temperature is 220 ℃ and the heating time is 5s by adopting a continuous feeding plastic-absorbing process, then manufacturing the bamboo fiber reinforced plastic-absorbing lunch box by utilizing a vacuum adsorption process, and finally carrying out air cooling, demolding, post-treatment, cutting and trimming to obtain a finished product of the moso bamboo fiber bundle reinforced plastic-absorbing formed lunch box.
The performance of the bamboo fiber reinforced plastic sheet prepared by the embodiment is as follows: the density was 0.7g/cm3The internal bonding strength is more than or equal to 0.3MPa, the elongation at break is 80 percent, the bending strength is 20MPa, and the molding compression ratio is less than 5 percent.
The performance of the finished product of the plastic uptake forming lunch box reinforced by the moso bamboo fiber bundles prepared by the embodiment is as follows: the folding strength is more than or equal to 120 times, and the impact strength of the simply supported beam notch is 6.5kJ/m2(ii) a Physical and chemical properties: the performances of the dropping performance, the water leakage performance, the hot water resistance, the hot oil resistance, the soaking solution and the like reach the standard requirements; heavy metals (calculated as Pb, 4% acetic acid, volume fraction, 60 ℃, 2h) < 2mg/kg, fluorescent substances (254nm and 365nm) are negative.
Experiments prove that the bamboo fiber reinforced plastic-absorption lunch box prepared by the embodiment has the bacteriostatic function, and the microorganisms comprise coliform group bacteria and salmonella (/50 cm)2) No mould (CFU/g) < 10 was detected.
Example 4
This example is the same as example 1, except that: in the step one, the emulsifier is an anionic emulsifier or a cationic emulsifier, the anionic emulsifier is potassium lauryl phosphate, and the cationic emulsifier is hexadecyltrimethylammonium chloride.
Example 5
The preparation method of the moso bamboo fiber bundle reinforced plastic molding packaging container (tray) comprises the following steps:
step one, bamboo fiber modification: the method comprises the following steps of taking moso bamboos as raw materials, preparing the moso bamboo long bamboo fibers by adopting the method disclosed in the patent name 'preparation method of long bamboo fibers for molding composite materials (application number 202010385470. X'), rinsing and sterilizing, putting 100 parts of the moso bamboo long bamboo fibers into a compound softening agent for hydrophobic softening treatment, wherein the proportion of each component of the compound softening agent to the moso bamboo long bamboo fibers is as follows: the mass ratio of the long bamboo fibers of the moso bamboo, the water b, the dimethyl silicone oil and the potassium lauryl phosphate is 100: 1000: 5: 10, the temperature of hydrophobic softening treatment is 45 ℃, the time is 35min, and the stirring speed is 3000 r/min; after softening treatment, according to the mass ratio of the long bamboo fibers of the moso bamboo, water a, polyethylene terephthalate fibers, polyacrylamide and polyglycerol caprylate of 100: 1000: 6: 2: 12, adding polyethylene terephthalate fiber, polyacrylamide, polyglycerol caprylate and water a, continuously stirring, and then adjusting the pH value to 4 to prepare a modified bamboo fiber suspension with the solid content of 80%;
step two, preparing the modified bamboo fiber thin felt: simultaneously carrying out mechanical reciprocating vibration with the oscillation frequency of 200r/min and ultrasonic treatment with the ultrasonic frequency of 20KHz on the modified bamboo fiber suspension liquid obtained in the step one, wherein the treatment time is 10min, then moving a forming filter screen, uniformly attaching the forming filter screen to the filter screen to form a wet fiber mat, and sequentially carrying out water filtration, lower part vacuum pumping and directional dehydration to obtain the modified bamboo fiber mat, wherein the surface density of the modified bamboo fiber mat is 50g/m2The thickness is 10mm, and the water content is lower than 10 percent;
step three, preparing the bamboo fiber reinforced plastic sheet: rolling and compounding the modified bamboo fiber mat obtained in the step two and a graphene polyethylene terephthalate film coated with a modified silane coupling agent (commercially available), then heating and rolling and compounding by using a hot melt impregnator under the conditions that the feeding speed is 2m/min, the rolling temperature is 110 ℃ and the rolling pressure is 0.25MPa, and keeping the temperature to obtain a bamboo fiber reinforced plastic-absorbing sheet; the coating amount of the coupling agent is 3% of the mass of the polyethylene terephthalate film, and the mass fraction of the polyethylene terephthalate film in the bamboo fiber reinforced plastic sheet is 23%;
the specific process for preparing the graphene polyethylene terephthalate fiber comprises the following steps: mixing polyethylene terephthalate fiber, distilled water and graphene according to the mass ratio of 150:1000:5, reacting for 60min at the temperature of 90 ℃ and the rotating speed of 3000r/min, and then carrying out suction filtration and drying to obtain graphene polyethylene terephthalate fiber;
step four, preparing the bamboo fiber reinforced plastic packaging container: and (3) carrying out secondary heating on the bamboo fiber reinforced plastic-absorbing sheet prepared in the step three under the conditions that the temperature is 150 ℃ and the heating time is 10s by adopting a continuous feeding plastic-absorbing process, then manufacturing a bamboo fiber reinforced plastic-absorbing bowl by utilizing a vacuum adsorption process, and finally carrying out air cooling, demolding, post-treatment, cutting and trimming to obtain a finished product of the moso bamboo fiber bundle reinforced plastic-absorbing forming tray.
The performance of the bamboo fiber reinforced plastic sheet prepared by the embodiment is as follows: the density was 0.5g/cm3The internal bonding strength is more than or equal to 0.2MPa, the elongation at break is 50 percent, the bending strength is 40MPa, and the molding compression ratio is less than 5 percent.
The performance of the finished product of the moso bamboo fiber bundle reinforced plastic molding tray prepared by the embodiment is as follows: the folding strength is more than or equal to 80 times, and the impact strength of the simply supported beam notch is 9kJ/m2(ii) a Physical and chemical properties: the performances of the dropping performance, the water leakage performance, the hot water resistance, the hot oil resistance, the soaking solution and the like reach the standard requirements; heavy metals (calculated as Pb, 4% acetic acid, volume fraction, 60 ℃, 2h) < 2mg/kg, fluorescent substances (254nm and 365nm) are negative.
Experiments prove that the bamboo fiber reinforced plastic suction bowl prepared by the embodiment has the antistatic function, and the surface resistivity is 1 multiplied by 104-omega and less than 1 multiplied by 106。
Example 6
This example is the same as example 1, except that: in the step one, the emulsifier is hexadecyl trimethyl ammonium chloride or octadecyl trimethyl ammonium chloride.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.
Claims (8)
1. A preparation method of a moso bamboo fiber bundle reinforced plastic uptake forming packaging container is characterized by comprising the following steps:
step one, bamboo fiber modification: rinsing and sterilizing the long moso bamboo fibers, putting the long moso bamboo fibers into a compound softening agent for hydrophobic softening treatment for 30-40 min under the conditions that the temperature is 40-50 ℃ and the stirring speed is 2000-3000 r/min, and then adding the long moso bamboo fibers, water a, polyethylene terephthalate fibers, polyacrylamide and polyglycerol caprylate into the compound softening agent according to the mass ratio of 100: 1000: (5-9): (2-6): (8-12) adding water a, polyethylene terephthalate fibers, polyacrylamide and polyglycerol caprylate, uniformly mixing, and finally adjusting the pH value to 4-6 to prepare a modified bamboo fiber suspension;
the compound softening agent consists of water b, dimethyl silicone oil and an emulsifier, and the mass ratio of the long bamboo fibers of the moso bamboos to the water b, the dimethyl silicone oil and the emulsifier in the hydrophobic softening treatment process is 100: 1000: (5-9): (10-15);
step two, preparing the modified bamboo fiber thin felt: simultaneously carrying out mechanical reciprocating vibration and ultrasonic treatment on the modified bamboo fiber suspension liquid in the step one, then uniformly attaching the modified bamboo fiber suspension liquid on a forming filter screen to form a wet fiber thin felt, and sequentially carrying out water filtration, lower part vacuumizing and directional dehydration to obtain the modified bamboo fiber thin felt;
step three, preparing the bamboo fiber reinforced plastic sheet: heating, rolling and compounding the modified bamboo fiber mat and the polyethylene terephthalate film coated with the coupling agent by using a hot melting impregnator, and keeping the temperature to obtain a bamboo fiber reinforced plastic-absorbing sheet;
step four, preparing the bamboo fiber reinforced plastic packaging container: and (4) carrying out secondary heating on the bamboo fiber reinforced plastic-absorbing sheet in the step three by adopting a continuous feeding plastic-absorbing process, and then manufacturing the bamboo fiber reinforced plastic-absorbing packaging container by utilizing a vacuum adsorption process.
2. The method for preparing the phyllostachys edulis fiber bundle-reinforced plastic uptake forming packaging container according to claim 1, wherein in the first step, the emulsifier is an anionic emulsifier or a cationic emulsifier, the anionic emulsifier is potassium lauryl phosphate, and the cationic emulsifier is cetyltrimethylammonium chloride or octadecyltrimethylammonium chloride.
3. The method for preparing the moso bamboo fiber bundle reinforced plastic uptake forming packaging container according to claim 1, wherein the solid content of the modified bamboo fiber suspension in the step one is 70-80%.
4. The method for preparing the moso bamboo fiber bundle reinforced plastic uptake forming packaging container according to claim 1, wherein the ultrasonic treatment frequency in the second step is 20KHz to 130KHz, the oscillation frequency is 30r/min to 300r/min, and the treatment time is 5min to 10 min; the surface density of the modified bamboo fiber thin felt is 50g/m2-250g/m2The thickness is 5mm-20mm, and the water content is less than 10%.
5. The method for preparing the moso bamboo fiber bundle reinforced plastic uptake forming packaging container according to claim 1, wherein the mass fraction of the polyethylene terephthalate film in the bamboo fiber reinforced plastic uptake sheet in the step three is 15-30%; the coating amount of the coupling agent is 3% of the mass of the polyethylene terephthalate film, and the coupling agent is a silane coupling agent or a nano-silver modified silane coupling agent; the feeding speed of the hot melting impregnator is 2m/min, the rolling temperature is 110-200 ℃, and the rolling pressure is 0.2-0.3 MPa.
6. The method for preparing the moso bamboo fiber bundle reinforced plastic uptake forming packaging container according to the claim 1, wherein the performance of the bamboo fiber reinforced plastic uptake sheet material in the third step is as follows: the density was 0.5g/cm3-0.7g/cm3The internal bonding strength is more than or equal to 0.2MPa, the elongation at break is 50-100%, the bending strength is 20-40 MPa, and the molding compression ratio is less than 5%.
7. The method for preparing the moso bamboo fiber bundle reinforced plastic uptake forming packaging container according to claim 1, wherein the secondary heating temperature in the fourth step is 150 ℃ to 220 ℃ and the heating time is 5s to 10 s.
8. The method for preparing the moso bamboo fiber bundle-reinforced plastic molding packaging container according to claim 1, wherein the bamboo fiber-reinforced plastic molding packaging container in the fourth step is a bamboo fiber-reinforced plastic molding lunch box.
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