A kind of preparation method of biodegradable packaging material for food
Technical field
The invention belongs to technical field of composite preparation, and in particular to a kind of biological to be dropped using manioc vinasse slag preparation
The method for solving packaging material for food.
Background technique
Guangxi possesses cassava resource abundant, and cassava cultivated area and yield are the whole nation first.Cassava is applied to starch
With a large amount of waste is generated after Alcohol Production --- cassava grain stillage, main component are cellulose, hemicellulose, lignin etc.
High-molecular compound, wherein fiber content is 70% or more.Cassava grain stillage is except part is for biological feedstuff, chemical fertilizer production at present
Outside, remaining major part is discarded, and has not only caused the waste of biomass resource, but also causes environmental pollution.If it suitably can be located
It ought to be used for the preparation of environmentally friendly chemical materials, it will the comprehensive utilization to mitigating environmental pollution, improving agricultural wastes
It is of great immediate significance.
Plastics itself have many advantages, such as light weight, corrosion-resistant and easy to form processing, and it is indispensable to become people
Material.However the use of plastics but faces huge challenge now.Plastics are difficult to degrade in nature, generate after use a large amount of
Solid waste.At present when handling these plastic garbages largely using the method burned and buried, but it all not can solve dirt
The some toxic gases generated after dye problem, such as burning further cause the diffusion of pollution instead;Plastics are buried underground and are needed
Taking nearly 300 years can be degradable.In addition petroleum, the energy such as natural gas have all faced exhausted crisis, global stone
Oilreserves can only be about the plastics-production of raw material by very big resistance using petroleum again with more than 40 years.In order to mitigate waste and old modeling
Expect pollution to environment and alleviating energy crisis, people attempt research composite material for many years, improve plastic chemistry stability,
While rigidity, toughness and mechanical strength, the biodegradable plastic that application range is wider, more environmentally friendly is prepared.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of preparation methods of biodegradable packaging material for food, lead to
Cross and re-use abandoned vinasse slag, it is modified that addition particular modification agent carries out surface to it, become meet it is biodegradable
It is required that material, reduce the cost of packaging material, and solve that the pollution of abandoned vinasse slag environment, resource utilization are low etc. to ask
Topic.
The present invention solves above-mentioned technical problem with following technical solution:
A kind of preparation method of biodegradable packaging material for food of the present invention, including following operating procedure:
Step 1: by the washing of anaerobism manioc vinasse slag, natural air drying, crossing 20 meshes, removes fine dust and bulky grain is miscellaneous
Matter;
Step 2: treated vinasse slag is placed in a vacuum drying oven, the dry 4h at 80 DEG C, then through being crushed to
Without large grained, 40 meshes are crossed;
Step 3: the smashed vinasse slag of step 2 is dissolved in LiCl/DMAC dissolution system, under room temperature, is led to
Crossing stirring makes vinasse Fibrinolysis, obtains uniform solution;
Step 4: the lauric acid centainly matched, two (dioctylphosphoric acid ester) metatitanic acid second diester and the compound of polyethylene glycol are changed
Property agent be added in above-mentioned uniform solution, be thoroughly mixed, be placed in micro-wave oven with magnetic stirring apparatus, in 50-60 DEG C of temperature,
400W microwave radiation processing 10min carries out Aided Modification;
Step 5: treated that vinasse slag washed by step 4, filters, dries, crushing, and obtains modified vinasse ground-slag
End;
Step 6: modified vinasse ground-slag end made from step 5 is placed in high-speed mixer, and dispersing agent, toughening is added
Agent, stabilizer, plasticizer and polycaprolactone (PCL) control revolving speed 900-1000r/min, mix 15min, discharging;
Step 7: the mixed material that step 6 is obtained moves in double screw extruder, sets each area's temperature of each bringing-up section
175 DEG C, 175 DEG C, 180 DEG C, 180 DEG C, 185 DEG C, 180 DEG C, 180 DEG C are followed successively by, head temperature is 180 DEG C, main-machine screw revolving speed
The compound primary material of cassava anaerobism vinasse slag is made through extrusion granulation for 140r/min, rate of feeding 30r/min;
Step 8: the compound primary material of cassava anaerobism vinasse slag that step 7 obtains is placed in vulcanizing press, in temperature
Under the conditions of 160-180 DEG C of degree, pressure 5MPa, hot pressing 15min forms to arrive biodegradable packaging material for food finished product.
In the step 6, the dispersing agent is polyglycerol fatty acid rouge;Toughener is nanometer calcium carbonate;The stabilizer
For Ca-Zn composite heat stabilizer;The plasticizer is citrate.
In the step 6, modified vinasse ground-slag end is by weight ratio with other auxiliary agents: modified vinasse ground-slag end 50-
150 parts, 100-200 parts of polycaprolactone, 2-3 parts of toughener, 2-3 parts of plasticizer, 2-3.5 parts of dispersing agent, 2-3 parts of stabilizer.
In the step 3,10min is stirred in 2000r/min using electric mixer when stirring.
In the LiCl/DMAC dissolution system of the step 3, the mass concentration of LiCl is 10%, and vinasse slag is in LiCl/
Mass concentration in DMAC dissolution system is 6%.
In the step 4, in the composite modifier of lauric acid, two (dioctylphosphoric acid ester) metatitanic acid second diester and polyethylene glycol,
Amount of modifier accounts for 3%, 2%, 1% of vinasse slag additive amount in step 3 respectively.
In the step 5, drying is to dry 4h under the conditions of 105 DEG C;Crushing is to be crushed to powder using high speed disintegrator
Shape, and sieve with 100 mesh sieve step by step, 80 meshes, 60 meshes, 40 meshes, dress hermetic bag is spare.
By re-using abandoned vinasse slag, addition particular modification agent carries out surface to it and is modified the present invention, makes its table
Face is changed into hydrophobicity by hydrophilic, low-surface-energy is dropped, to be conducive to the compatibility of cellulose and plastics, to strengthen composite wood
Expect the performances such as toughness, tensile strength, impact strength, becomes the material for meeting biodegradable requirement, greatly reduce packet
The cost of package material.
For the polycaprolactone (PCL) that the present invention uses in soil and water environment, the 6-12 month can resolve into CO completely2And H2O,
Any pollution is not generated to environment.And the waste utilization to anaerobism manioc vinasse slag, it can not only substantially reduce composite material
Production cost, while can reduce environmental pollution, it economizes on resources, promotes resource circulation utilization.
The method of the present invention has the advantages that
(1) the method for the present invention is raw material using anaerobism vinasse slag, low in cost, raw material is crushed, to a certain degree
On increase the specific surface area of micro mist, enhance its absorption property, obtained conducive to modifying agent and raw material abundant and uniform
Mixing.
(2) microwave radiation Aided Modification method is used, the time, reaction speed is fast, reaction efficiency is high, saves energy with saving
The advantages such as source.
(3) anaerobism manioc vinasse slag biodegradation material has particular characteristic required for packaging after forming finished product;Product
Not mutability, the advantages that increasing elasticity, toughness, impact strength, tensile strength.
(4) using anaerobism vinasse slag as the raw material for preparing packaging material, this can not only substantially reduce production cost, simultaneously
It can reduce environmental pollution, economize on resources, promote resource circulation utilization.
It (5) the use of PCL is raw material, degradable in the natural environment is carbon dioxide and water, and degradation cycle is short, not to environment
Any harm is generated, the biodegradable characteristic of composite material is realized.
(6) anaerobism manioc vinasse slag is modified using composite modifier, compared with single modifying agent, various modifying agent
Between the advantages of can be complementary to one another, to a certain extent improve vinasse slag modified effect.
Specific embodiment
To facilitate a better understanding of the present invention, it is illustrated by the following examples, these examples belong to protection of the invention
Range, but do not limit the scope of the invention.
Dispersing agent described in following examples is polyglycerol fatty acid rouge;Toughener is nanometer calcium carbonate;The stabilizer
For Ca-Zn composite heat stabilizer;The plasticizer is citrate.
Embodiment 1
Preparation step is as follows:
S1: by the washing of anaerobism manioc vinasse slag, natural air drying, 20 meshes are crossed, remove fine dust and large granular impurity.
S2: vinasse slag made from S1 is placed in a vacuum drying oven, dry 4h at 80 DEG C, then through high speed Universal pulverizer powder
It is broken to no large grained, and crosses 40 meshes.
S3: vinasse slag made from step S2 is dissolved in LiCl/DMAC dicyandiamide solution, and wherein LiCl mass concentration is
10%, it is 6% that vinasse slag accounts for mass fraction in dicyandiamide solution, at room temperature, is stirred with electric mixer 2000r/min
10min makes cellulose dissolution, obtains uniform solution.
S4: step S3 is added in the composite modifier of lauric acid, two (dioctylphosphoric acid ester) metatitanic acid second diester and polyethylene glycol
In obtained uniform solution, the dosage of lauric acid, two (dioctylphosphoric acid ester) metatitanic acid second diester and polyethylene glycol accounts for step S3 respectively
3%, 2%, the 1% of middle vinasse slag additive amount., it is thoroughly mixed, is placed in micro-wave oven with magnetic stirring apparatus, temperature 50-60
DEG C, 400W microwave radiation processing 10min carries out Aided Modification.
S5: the vinasse wash heat after step S4 reaction being washed, dry 4h at 105 DEG C, is then crushed to powdered, and mistake step by step
100 mesh, 80 mesh, 60 mesh, 40 meshes obtain modified vinasse ground-slag end.
S6: modified vinasse ground-slag end made from step S5 is placed in high-speed mixer, and auxiliary agent dispersing agent, crosslinking is added
Agent, toughener, stabilizer, plasticizer and polycaprolactone, modified vinasse ground-slag end are by weight ratio with other auxiliary agents: modified
Vinasse ground-slag last 100 parts, 100 parts of polycaprolactone, 2 parts of toughener, 2 parts of plasticizer, 2 parts of dispersing agent, 2 parts of stabilizer, control turn
Fast 900-1000r/min mixes 15min, discharging.
S7: it is moved to material is uniformly mixed made from step S6 in double screw extruder, sets each area's temperature of each bringing-up section
175 DEG C, 175 DEG C, 180 DEG C, 180 DEG C, 185 DEG C, 180 DEG C, 180 DEG C are followed successively by, head temperature is 180 DEG C, main-machine screw revolving speed
The compound primary material of cassava anaerobism vinasse slag is made through extrusion granulation for 140r/min, rate of feeding 30r/min.
S8: preliminary composite material obtained is placed in vulcanizing press, under the conditions of 190 DEG C of temperature, pressure 5MPa, heat
Press 15min molding to get biodegradable packaging material for food finished product.
The performance test results of the biodegradable packaging material for food:
Case |
Tensile strength/MPa |
Stretched film amount/MPa |
Elongation at break/% |
Embodiment 1 |
43 |
952 |
18 |
Embodiment 2
Preparation step is as follows:
S1: by the washing of anaerobism manioc vinasse slag, natural air drying, 20 meshes are crossed, remove fine dust and large granular impurity.
S2: vinasse slag made from S1 is placed in a vacuum drying oven, dry 4h at 80 DEG C, then through high speed Universal pulverizer powder
It is broken to no large grained, and crosses 40 meshes.
S3: vinasse slag made from step S2 is dissolved in LiCl/DMAC dicyandiamide solution, and wherein LiCl mass concentration is
10%, it is 6% that vinasse slag accounts for mass fraction in dicyandiamide solution, under room temperature, is stirred with electric mixer 2000r/min
10min makes cellulose dissolution, obtains uniform solution.
S4: step S3 is added in the composite modifier of lauric acid, two (dioctylphosphoric acid ester) metatitanic acid second diester and polyethylene glycol
In obtained uniform solution, the dosage of lauric acid, two (dioctylphosphoric acid ester) metatitanic acid second diester and polyethylene glycol accounts for step S3 respectively
3%, 2%, the 1% of middle vinasse slag additive amount.It is thoroughly mixed, is placed in micro-wave oven with magnetic stirring apparatus, temperature 50-60
DEG C, 400W microwave radiation processing 10min carries out Aided Modification.
S5: the vinasse wash heat after step S4 reaction being washed, dry 4h at 105 DEG C, is then crushed to powdered, and crosses 100
Mesh, 80 mesh, 60 mesh, 40 meshes obtain modified vinasse ground-slag end.
S6: modified vinasse ground-slag end made from step S5 is placed in high-speed mixer, and auxiliary agent dispersing agent, crosslinking is added
Agent, toughener, stabilizer, plasticizer and polycaprolactone, modified vinasse ground-slag end are by weight ratio with other auxiliary agents: modified
Vinasse ground-slag last 50 parts, 150 parts of polycaprolactone, 3 parts of toughener, 3 parts of plasticizer, 3 parts of dispersing agent, 3 parts of stabilizer, control revolving speed
900-1000r/min mixes 15min, discharging.
S7: it is moved to material is uniformly mixed made from step S6 in double screw extruder, sets each area's temperature of each bringing-up section
175 DEG C, 175 DEG C, 180 DEG C, 180 DEG C, 185 DEG C, 180 DEG C, 180 DEG C are followed successively by, head temperature is 180 DEG C, main-machine screw revolving speed
The compound primary material of cassava anaerobism vinasse slag is made through extrusion granulation for 140r/min, rate of feeding 30r/min.
S8: preliminary composite material obtained is placed in compression molding agent, under the conditions of 170 DEG C of temperature, pressure 5MPa, heat
Press 15min molding to get biodegradable packaging material.
The performance test results of the biodegradable packaging material for food:
Case |
Tensile strength/MPa |
Stretched film amount/MPa |
Elongation at break/% |
Embodiment 2 |
24 |
400 |
19 |
Embodiment 3
Preparation step is as follows:
S1: by the washing of anaerobism manioc vinasse slag, natural air drying, 20 meshes are crossed, remove fine dust and large granular impurity.
S2: vinasse slag made from S1 is placed in a vacuum drying oven, dry 4h at 80 DEG C, then through high speed Universal pulverizer powder
It is broken to no large grained, and crosses 40 meshes.
S3: vinasse slag made from step S2 is dissolved in LiCl/DMAC dicyandiamide solution, and wherein LiCl mass concentration is
10%, it is 6% that vinasse slag accounts for mass fraction in dicyandiamide solution, under room temperature, is stirred with electric mixer 2000r/min
10min makes cellulose dissolution, obtains uniform solution.
S4: step S3 is added in the composite modifier of lauric acid, two (dioctylphosphoric acid ester) metatitanic acid second diester and polyethylene glycol
In obtained uniform solution, the dosage of lauric acid, two (dioctylphosphoric acid ester) metatitanic acid second diester and polyethylene glycol accounts for step S3 respectively
3%, 2%, the 1% of middle vinasse slag additive amount, is thoroughly mixed with magnetic stirring apparatus, is placed in micro-wave oven, temperature 50-60
DEG C, 400W microwave radiation processing 10min carries out Aided Modification.
S5: the vinasse wash heat after step S4 reaction being washed, dry 4h at 105 DEG C, is then crushed to powdered, and crosses 100
Mesh, 80 mesh, 60 mesh, 40 meshes obtain modified vinasse ground-slag end.
S6: modified vinasse ground-slag end made from step S5 is placed in high-speed mixer, and auxiliary agent dispersing agent, crosslinking is added
Agent, toughener, stabilizer, plasticizer and PCL, modified vinasse ground-slag end are by weight ratio with other auxiliary agents: modified vinasse
Ground-slag end 120 parts, 180 parts of polycaprolactone, 2.5 parts of toughener, 2.5 parts of plasticizer, 2.5 parts of dispersing agent, 2.5 parts of stabilizer, control
Revolving speed 900-1000r/min processed mixes 15min, discharging.
S7: it is moved to material is uniformly mixed made from step S6 in double screw extruder, sets each area's temperature of each bringing-up section
175 DEG C, 175 DEG C, 180 DEG C, 180 DEG C, 185 DEG C, 180 DEG C, 180 DEG C are followed successively by, head temperature is 180 DEG C, main-machine screw revolving speed
The compound primary material of cassava anaerobism vinasse slag is made through extrusion granulation for 140r/min, rate of feeding 30r/min.
S8: preliminary composite material obtained is placed in compression molding agent, under the conditions of 180 DEG C of temperature, pressure 5MPa, heat
Press 15min molding to get biodegradable packaging material.
The performance test results of the biodegradable packaging material for food:
Case |
Tensile strength/MPa |
Stretched film amount/MPa |
Elongation at break/% |
Embodiment 3 |
36 |
594 |
16 |
The above content is it cannot be assumed that present invention specific implementation is only limited to these instructions, for the technical field of the invention
Those of ordinary skill for, under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all answers
When being considered as belonging to present invention scope of patent protection determined by the appended claims.