CN111423625A - Preparation method of environment-friendly packaging material based on modified corn starch - Google Patents
Preparation method of environment-friendly packaging material based on modified corn starch Download PDFInfo
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/46—Applications of disintegrable, dissolvable or edible materials
- B65D65/466—Bio- or photodegradable packaging materials
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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
- C08J2303/00—Characterised by the use of starch, amylose or amylopectin or of their derivatives or degradation products
- C08J2303/02—Starch; Degradation products thereof, e.g. dextrin
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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
- C08J2401/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J2401/02—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
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/04—Ingredients characterised by their shape and organic or inorganic ingredients
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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
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/05—Alcohols; Metal alcoholates
- C08K5/053—Polyhydroxylic alcohols
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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
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/10—Esters; Ether-esters
- C08K5/12—Esters; Ether-esters of cyclic polycarboxylic acids
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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
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/15—Heterocyclic compounds having oxygen in the ring
- C08K5/151—Heterocyclic compounds having oxygen in the ring having one oxygen atom in the ring
- C08K5/1545—Six-membered rings
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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
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
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Abstract
The invention discloses a preparation method of an environment-friendly packaging material based on modified corn starch. According to the invention, the corn starch is subjected to multi-section modification treatment, the performance of the corn starch is greatly enhanced, and the corn starch, diatomite, a coupling agent and the like are extruded by a double screw to prepare the packaging material which is not easy to break and layer when in use, so that the packaging material has excellent mechanical and mechanical properties, the preparation process is simple as a whole, the raw material source is wide, the utilization rate of waste resources is improved, and meanwhile, the product has excellent degradability and has an ideal environment-friendly effect when being used as the packaging material.
Description
Technical Field
The invention belongs to the technical field of packaging materials, and particularly relates to a preparation method of an environment-friendly packaging material based on modified corn starch.
Background
The packaging material is used for manufacturing packaging containers, packaging decoration, packaging printing, packaging transportation and the like, and meets the requirements of product packaging, and the packaging materials which are commonly used at present comprise metal, paper, expanded polystyrene plastics, polyurethane plastics and the like. The metal package has high cost, heavy weight and poor buffering performance, and if the instrument and the equipment collide with each other, the metal package also can damage the instrument and the equipment due to the lack of buffering toughness. The strength of paper packaging materials is not enough, in addition, a large amount of paper is wasted by paper packaging, and the paper is mainly made of wood, so that a large amount of wood is cut down naturally due to excessive use of the paper packaging, and the environment protection and water and soil conservation are not facilitated. The cost of the mould is high by adopting the moulded or assembled polystyrene; the mechanical property of the spliced polystyrene is poor, the polystyrene is easy to break under impact, and in addition, the polystyrene is often separated out by monomer styrene in the using process, which is not good for human health and is easy to produce white pollution after being discarded. Therefore, the packaging performance is met, the pollution to the environment is reduced, and the green production concept is met.
The corn starch has the advantages of low price, wide source, complete biodegradation and the like, is an important raw material for preparing a completely biodegradable material, is suitable for preparing a packaging material, and has higher hardness and brittleness due to the semi-rigid characteristic of glucose residues on macromolecular chains in the corn starch and the hydrogen bond action among starch molecules, and is easy to pulverize under the action of external force, so the application effect of the corn starch as the packaging material is influenced.
Disclosure of Invention
The invention aims to make up the defects of the prior art and provides a preparation method of an environment-friendly packaging material based on modified corn starch.
In order to achieve the above object, the present invention provides the following technical solutions:
the preparation method of the environment-friendly packaging material based on the modified corn starch comprises the steps of plasticizing and modifying the corn starch to obtain the modified corn starch, reinforcing the modified corn starch by paper fibers, mixing with polyvinyl alcohol, extruding and blowing the polyvinyl alcohol by a double screw rod to obtain the environment-friendly packaging material.
The preparation method of the environment-friendly packaging material based on the modified corn starch comprises the following specific steps:
(1) dissolving corn starch in water to prepare a solution with the mass concentration of 3-4%, heating to 95-98 ℃, adding urea and sucrose stearate, mixing and boiling for 60-90 minutes, and drying to obtain modified corn starch for later use;
(2) placing the waste paper packaging material in alkali liquor to be soaked for 12-36 hours, then diluting to be neutral, drying at the temperature of 100 ℃ and 120 ℃, and then crushing to obtain paper fibers for later use;
(3) adding the modified corn starch obtained in the step (1), the paper fiber obtained in the step (2), glycerol and dioctyl phthalate into a blender, mixing for 20-30 minutes, adding 60% polyvinyl alcohol aqueous solution into the blender, stirring uniformly, standing for 24-48 hours, and fully swelling to obtain a pad fluid;
(4) and (3) uniformly stirring the pre-solution, the diatomite and the coupling agent, feeding the mixture into a double-screw extruder, and blowing a film by using a double-screw extruder to form a packaging film.
Furthermore, in the step 1, the adding amount of the urea is 20-25% of the dry weight of the corn starch, and the adding amount of the sucrose stearate is 3-6% of the dry weight of the corn starch.
Further, the waste paper packaging material in the step 2 comprises a waste paper box, a waste paperboard and a waste paper box.
Further, the mass ratio of the modified corn starch, the paper fiber, the glycerol, the dioctyl phthalate and the polyvinyl alcohol aqueous solution in the step 3 is (22-26): (10-14): (6-8): (3-4): (12-18).
Further, the coupling agent in the step 4 is gamma-methacryloxypropyltrimethoxysilane.
Further, the mass ratio of the pad fluid, the diatomite and the coupling agent in the step 4 is (40-50): (25-30): (10-15).
Further, the rotation speed of the extruder in the step 4 is controlled to be 80-100 rpm, and the temperatures of the extrusion zones are respectively 80-85 ℃, 115-120 ℃, 130-140 ℃, 140-150 ℃, 110-120 ℃ and 85-90 ℃.
The invention has the advantages that:
1. according to the invention, the corn starch is plasticized and modified by using sucrose stearate, the sucrose stearate contains a stearic acid hydrophobic chain and a sucrose hydrophilic group, after the sucrose stearate is contacted with a starch material, the hydrophobic group can enter an amylose single helix, and meanwhile, a plurality of hydroxyl groups of sucrose group can be combined with a starch molecular hydrogen bond, so that the corn starch is plasticized, and the mechanical property and mechanical property of the corn starch are improved.
2. A large amount of paper fibers are obtained by hydrolyzing waste paper packaging materials with alkali liquor, and the paper fibers are added into corn starch, so that components among the starch are mutually entangled, the supporting force among chain segments is increased, and the overall mechanical property and mechanical property of the material are further improved.
3. According to the invention, the corn starch is subjected to multi-section modification treatment, the performance of the corn starch is greatly enhanced, and the corn starch, diatomite, a coupling agent and the like are extruded by a double screw to prepare the packaging material which is not easy to break and layer when in use, so that the packaging material has excellent mechanical and mechanical properties, the preparation process is simple as a whole, the raw material source is wide, the utilization rate of waste resources is improved, and meanwhile, the product has excellent degradability and has an ideal environment-friendly effect when being used as the packaging material.
Detailed Description
The technical scheme of the invention is further explained by combining the specific examples as follows:
example 1
A preparation method of an environment-friendly packaging material based on modified corn starch comprises the following steps:
(1) dissolving corn starch in water to prepare a solution with the mass concentration of 3%, heating to 95 ℃, adding urea with the weight of 20% of the dry weight of the corn starch and sucrose stearate with the weight of 3% of the dry weight of the corn starch, mixing, boiling for 60 minutes, and drying to obtain modified corn starch for later use;
(2) placing the waste paper box in alkali liquor to be soaked for 12 hours, then diluting to be neutral, drying at 100 ℃, and then crushing to obtain paper fibers for later use;
(3) adding the modified corn starch obtained in the step 1, the paper fiber obtained in the step 2, glycerol and dioctyl phthalate into a blender, mixing for 20 minutes, adding 60% of polyvinyl alcohol aqueous solution into the blender, stirring uniformly, standing for 24 hours, and fully swelling to obtain a pad fluid, wherein the mass ratio of the modified corn starch to the paper fiber to the glycerol to the dioctyl phthalate to the polyvinyl alcohol aqueous solution is 22: 10: 6: 3: 12;
(4) mixing the pad fluid with diatomite and gamma-methacryloxypropyltrimethoxysilane according to a mass ratio of 40: 25: 10, stirring and mixing uniformly, feeding into a double-screw extruder, controlling the rotating speed of the extruder to be 80 rpm, and blowing a film by using a double-screw extrusion forming machine to form a packaging film, wherein the temperatures of extrusion zones are respectively 80 ℃, 115 ℃, 130 ℃, 140 ℃, 110 ℃ and 85 ℃.
Example 2
A preparation method of an environment-friendly packaging material based on modified corn starch comprises the following steps:
(1) dissolving corn starch in water to prepare a solution with the mass concentration of 4%, heating to 98 ℃, adding urea with the weight of 25% of the dry weight of the corn starch and sucrose stearate with the weight of 6% of the dry weight of the corn starch, mixing, boiling for 90 minutes, and drying to obtain modified corn starch for later use;
(2) soaking the waste paperboard in alkali liquor for 36 hours, then diluting to be neutral, drying at 120 ℃, and crushing to obtain paper fibers for later use;
(3) adding the modified corn starch obtained in the step 1, the paper fiber obtained in the step 2, glycerol and dioctyl phthalate into a blender, mixing for 30 minutes, adding 60% of polyvinyl alcohol aqueous solution into the blender, stirring uniformly, standing for 48 hours, and fully swelling to obtain a pad fluid, wherein the mass ratio of the modified corn starch to the paper fiber to the glycerol to the dioctyl phthalate to the polyvinyl alcohol aqueous solution is 26: 14: 8: 4: 18;
(4) mixing the pad fluid with diatomite and gamma-methacryloxypropyltrimethoxysilane according to a mass ratio of 50: 30: 15, stirring and mixing uniformly, feeding into a double-screw extruder, controlling the rotating speed of the extruder to be 100 revolutions per minute, and blowing a film by using a double-screw extrusion forming machine to form the packaging film, wherein the temperatures of extrusion zones are 85 ℃, 120 ℃, 140 ℃, 150 ℃, 120 ℃ and 90 ℃.
Example 3
A preparation method of an environment-friendly packaging material based on modified corn starch comprises the following steps:
(1) dissolving corn starch in water to prepare a solution with the mass concentration of 3%, heating to 96 ℃, adding urea with the weight of 24% of the dry weight of the corn starch and sucrose stearate with the weight of 5% of the dry weight of the corn starch, mixing, boiling for 75 minutes, and drying to obtain modified corn starch for later use;
(2) soaking the waste paper box in alkali liquor for 24 hours, diluting to be neutral, drying at 110 ℃, and crushing to obtain paper fibers for later use;
(3) adding the modified corn starch obtained in the step 1, the paper fiber obtained in the step 2, glycerol and dioctyl phthalate into a blender, mixing for 25 minutes, adding 60% of polyvinyl alcohol aqueous solution into the blender, stirring uniformly, standing for 36 hours, and fully swelling to obtain a pad fluid, wherein the mass ratio of the modified corn starch to the paper fiber to the glycerol to the dioctyl phthalate to the polyvinyl alcohol aqueous solution is 24: 12: 7: 3: 15;
(4) mixing the pad fluid with diatomite and gamma-methacryloxypropyltrimethoxysilane according to a mass ratio of 45: 28: 12, stirring and mixing uniformly, feeding into a double-screw extruder, controlling the rotating speed of the extruder to be 90 revolutions per minute, and blowing a film by using a double-screw extrusion forming machine to form the packaging film, wherein the temperatures of extrusion zones are 85 ℃, 115 ℃, 135 ℃, 145 ℃, 115 ℃ and 85 ℃.
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 changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The preparation method of the environment-friendly packaging material based on the modified corn starch is characterized in that the corn starch is plasticized and modified to obtain the modified corn starch, and then the modified corn starch is reinforced by paper fibers, mixed with polyvinyl alcohol and subjected to double-screw extrusion and film blowing to obtain the environment-friendly packaging material.
2. The preparation method of the environment-friendly packaging material based on the modified corn starch as claimed in claim 1, which is characterized by comprising the following specific steps:
(1) dissolving corn starch in water to prepare a solution with the mass concentration of 3-4%, heating to 95-98 ℃, adding urea and sucrose stearate, mixing and boiling for 60-90 minutes, and drying to obtain modified corn starch for later use;
(2) placing the waste paper packaging material in alkali liquor to be soaked for 12-36 hours, then diluting to be neutral, drying at the temperature of 100 ℃ and 120 ℃, and then crushing to obtain paper fibers for later use;
(3) adding the modified corn starch obtained in the step (1), the paper fiber obtained in the step (2), glycerol and dioctyl phthalate into a blender, mixing for 20-30 minutes, adding 60% polyvinyl alcohol aqueous solution into the blender, stirring uniformly, standing for 24-48 hours, and fully swelling to obtain a pad fluid;
(4) and (3) uniformly stirring the pre-solution, the diatomite and the coupling agent, feeding the mixture into a double-screw extruder, and blowing a film by using a double-screw extruder to form a packaging film.
3. The method for preparing the environment-friendly packaging material based on modified corn starch as claimed in claim 2, wherein the adding amount of urea in the step 1 is 20-25% of the dry weight of the corn starch, and the adding amount of sucrose stearate is 3-6% of the dry weight of the corn starch.
4. The method for preparing the environment-friendly packaging material based on modified corn starch as claimed in claim 2, wherein the waste paper packaging material in the step 2 comprises waste paper boxes, waste paperboard and waste paper boxes.
5. The method for preparing the environment-friendly packaging material based on modified corn starch as claimed in claim 2, wherein the mass ratio of the modified corn starch, the paper fiber, the glycerol, the dioctyl phthalate and the aqueous solution of the polyvinyl alcohol in the step 3 is (22-26): (10-14): (6-8): (3-4): (12-18).
6. The method for preparing the environment-friendly packaging material based on modified corn starch as claimed in claim 2, wherein the coupling agent in the step 4 is gamma-methacryloxypropyltrimethoxysilane.
7. The method for preparing the environment-friendly packaging material based on the modified corn starch as claimed in claim 2, wherein the mass ratio of the pad fluid, the diatomite and the coupling agent in the step 4 is (40-50): (25-30): (10-15).
8. The method as claimed in claim 2, wherein the rotation speed of the extruder in step 4 is controlled to be 80-100 rpm, and the temperatures of the extrusion zones are 80-85 ℃, 115-120 ℃, 130-140 ℃, 140-150 ℃, 110-120 ℃ and 85-90 ℃.
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2020
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Application publication date: 20200717 |