CN104910440A - Antibacterial starch-blended full-degradable plastic film and preparation method thereof - Google Patents

Abstract

The invention discloses an antibacterial starch-blended full-degradable plastic film. The antibacterial starch-blended full-degradable plastic film is prepared from following raw materials, by weight, 60 to 65 parts of corn starch, 7 to 9 parts of nano montmorillonite, 0.6 to 0.7 part of peanut oil, 1.2 to 1.4 parts of tetrabutyl titanate, 12 to 14 parts of ramie straw, 30 to 35 parts of polyvinyl alcohol, 1 to 1.2 parts of food-grade white oil, 2.5 to 4 parts of chitosan, 13 to 15 parts of tributyl citrate, 2 to 3 parts of mustard oil, 1 to 1.5 parts of potassium sorbate, 2 to 2.5 parts of stearic acid, and 3 to 5 parts of kaolin. The blended full-degradable plastic film is prepared by taking starch as matrix and via blending of an appropriate amount of polyvinyl alcohol; the antibacterial starch-blended full-degradable plastic film contains mustard oil, so that antibacterial effects are excellent; the antibacterial starch-blended full-degradable plastic film contains tributyl citrate, so that melting point of polyvinyl alcohol is reduced, and product processability and mechanical properties are improved; the food-grade raw materials are adopted, and are safe and non-toxic, so that the antibacterial starch-blended full-degradable plastic film is suitable to be made into food packaging materials or preservative film; and complete degradation can be realized in natural environment after discarding.

Description

A kind of antibacterial starch blending type Based Full-degradable Plastics Film and preparation method thereof

Technical field

The present invention relates to plastics film technical field, particularly a kind of antibacterial starch blending type Based Full-degradable Plastics Film and preparation method thereof.

Background technology

In recent years, because waste plastic " white pollution " brought that be difficult to degrade is on the rise, cause global extensive concern, countries in the world have been put into effect restriction successively or have been prohibitted the use the relevant laws and regulations of non-degradable plastic packing article.On the other hand, be Nonrenewable resources owing to manufacturing the raw material oil of conventional plastic, along with a large amount of uses of the mankind will be exhausted, thus developing with renewable resources is that raw material, degradable environmental friendliness plastic are extremely urgent.Utilize biodegradable starch material to prepare the focus that degradable packaging film has become countries in the world research.But starch is while raising plastics degradability, the decline of its physical and mechanical properties can be caused on the one hand, make its processing difficulties, also there is wetting ability on the other hand too strong, and the consistency between most of resins for universal use is very poor, cause the thin film mechanical performance made to decline to a great extent, block-water performance is poor, thus hinders the widespread use of starch plastic in industrialization promotion process.

Polyvinyl alcohol is a kind of broad-spectrum high molecular polymer; performance is between plastics and rubber; containing a large amount of polar group hydroxyls; toxicity is very low; molecular chain structure symmetry is regular; the water tolerance that there is unique strong adherence, epithelium snappiness, smoothness, oil-proofness, solvent resistance, protective colloid, gas barrier performance and have through special processing; also there is certain biological degradability simultaneously; having in wet environment under bacterium existent condition and can resolve into water and carbonic acid gas completely in 6 months, is Biodegradable Materials.

Ramie is the traditional fibre crop having distinct Chinese characteristics, and the long-term ramie planting area of China reaches about 200,000 hectares, and except ramie phloem extracts as except textile product, ramie boon is seldom utilized.The problems such as ramie boon utilization ratio is low, and process is difficult are governments at all levels and relevant department's question of common concern always, are also the problems that peasant is extremely concerned about.The by product that ramie core is processed as the large-scale production of ramie industry; important Biological resources; wherein rich cellulose, hemicellulose; its content of cellulose and the similar deciduous species of fibre shape; be the raw materials of desirable plant fiber tableware in theory, and it is rationally developed for raising ramie comprehensive value efficiently, promotes that ramie industry development is all significant.

Summary of the invention

The object of this invention is to provide a kind of antibacterial starch blending type Based Full-degradable Plastics Film and preparation method thereof.The present invention uses the starch of the surface hydrophobicity modification of high-content as matrix, add polyvinyl alcohol and the tributyl citrate of appropriate ratio, safety non-toxic, the fusing point of polyvinyl alcohol can be reduced, be convenient to carry out blended with starch matrix, mechanical property and the water tolerance of film can be improved; Add appropriate mustard oil, there is certain antibacterial effect, and safety non-toxic, can be used for manufacturing the wrapping material of food grade or preservative film etc.

In order to realize object of the present invention, the present invention is by following scheme implementation:

A kind of antibacterial starch blending type Based Full-degradable Plastics Film, is made up of the raw material of following weight part: W-Gum 60-65, nano imvite 7-9, peanut oil 0.6-0.7, tetrabutyl titanate 1.2-1.4, ramie boon 12-14, polyvinyl alcohol 30-35, food-level white oil 1-1.2, chitosan 2.5-4, tributyl citrate 13-15, mustard oil 2-3, potassium sorbate 1-1.5, stearic acid 2-2.5, kaolin 3-5;

One of the present invention antibacterial starch blending type Based Full-degradable Plastics Film, be made up of following concrete steps:

(1) baking oven is put into after being mixed with nano imvite by W-Gum, take out after dry 120 minutes under the condition of 130 DEG C, (controlling bath temperature is 30 DEG C after being cooled to room temperature, mixed powder to be utilized sonic oscillation 30-40 minute, ultrasonic power is 100W), then mixed powder is transferred in stirring tank, add tetrabutyl titanate, control temperature is 75 DEG C, after stirring 15 minutes with the speed of 1500 revs/min, continue to add peanut oil, stir 15 minutes, finally take out and put into baking oven, the dry mixed powder namely obtaining surface hydrophobicity process for 60 minutes under the condition of 120 DEG C,

(2) 80-100 object powder is made after the drying of ramie boon through corase grind, fine grinding, then put into nano grinder after mixing with kaolin and be ground into nanoscale powder, mix with chitosan again, kneader is put into after mixing, temperature control 120 DEG C, mediate 20 minutes, release cooling, obtain ramie boon and strengthen material;

(3) mixed powder of surface hydrophobicity modification step (1) obtained mixes with food-level white oil, stearic acid, by colloidal mill dispersion 60-90 minute, then the ramie boon enhancing material that step (2) obtains is added, by in dual-screw pelletizer, melt extrude granulation under the condition of control temperature 170-180 DEG C, obtain the starch masterbatch that diameter is 6mm;

(4) after starch masterbatch, polyvinyl alcohol, tributyl citrate and all the other remaining components that step (3) obtains being mixed at normal temperatures, join in single screw extrusion machine, control temperature carries out hot-melt extruded Blown Film under the processing temperature of 170-180 DEG C, last qualitative rolling, packs and get final product.

The invention has the beneficial effects as follows: the present invention adopts the safe materials of food grade, composition proportion is scientific and reasonable, first hydrophobizing surface process is carried out to starch, nano imvite, sonic oscillation makes the particle diameter of starch decline, specific surface area increases, tetrabutyl titanate and hydrophobizing agent peanut oil effectively shield starch surface hydroxyl, form high hydrophobic layer; Simultaneously nano imvite has good gas barrier property and good far-infrared reflection, anti-aging, simultaneously heat-resisting, wear-resisting, intensity is high; Next utilizes kaolin, chitosan to strengthen ramie boon, as the strongthener of Based Full-degradable Plastics Film, has good water-fast, oil resistance, intensity is high, improves thin film strength, can be dissolved after use by environment, and cost is low, turn waste into wealth, can not pollution be produced.

The present invention is the commixed type Based Full-degradable Plastics Film that starch base coordinates appropriate polyvinyl alcohol to make, and includes mustard oil, has good antibiotic effect; Include tributyl citrate, the fusing point of polyvinyl alcohol can be reduced, processibility and the mechanical property of product can be improved, products material is that grade-safe is nontoxic, be applicable to manufacturing food product pack or preservative film, can be degradable under physical environment after discarded, can not to environment.

Specific embodiments

Below by specific examples, the present invention is described in detail.

A kind of antibacterial starch blending type Based Full-degradable Plastics Film, is made up of the raw material of following weight part (kilogram): W-Gum 60, nano imvite 7, peanut oil 0.6, tetrabutyl titanate 1.2, ramie boon 12, polyvinyl alcohol 30, food-level white oil 1, chitosan 2.5, tributyl citrate 13, mustard oil 2, potassium sorbate 1, stearic acid 2, kaolin 3;

One of the present invention antibacterial starch blending type Based Full-degradable Plastics Film, be made up of following concrete steps:

(1) baking oven is put into after being mixed with nano imvite by W-Gum, take out after dry 120 minutes under the condition of 130 DEG C, (controlling bath temperature is 30 DEG C after being cooled to room temperature, mixed powder to be utilized sonic oscillation 40 minutes, ultrasonic power is 100W), then mixed powder is transferred in stirring tank, add tetrabutyl titanate, control temperature is 75 DEG C, after stirring 15 minutes with the speed of 1500 revs/min, continue to add peanut oil, stir 15 minutes, finally take out and put into baking oven, the dry mixed powder namely obtaining surface hydrophobicity process for 60 minutes under the condition of 120 DEG C,

(2) 80-100 object powder is made after the drying of ramie boon through corase grind, fine grinding, then put into nano grinder after mixing with kaolin and be ground into nanoscale powder, mix with chitosan again, kneader is put into after mixing, temperature control 120 DEG C, mediate 20 minutes, release cooling, obtain ramie boon and strengthen material;

(3) mixed powder of surface hydrophobicity modification step (1) obtained mixes with food-level white oil, stearic acid, 60 minutes are disperseed by colloidal mill, then the ramie boon enhancing material that step (2) obtains is added, by in dual-screw pelletizer, melt extrude granulation under the condition of control temperature 170-180 DEG C, obtain the starch masterbatch that diameter is 6mm;

(4) after starch masterbatch, polyvinyl alcohol, tributyl citrate and all the other remaining components that step (3) obtains being mixed at normal temperatures, join in single screw extrusion machine, control temperature carries out hot-melt extruded Blown Film under the processing temperature of 170-180 DEG C, last qualitative rolling, packs and get final product.

Product of the present invention is carried out explanation test according to the standard of GB/T 20197-2006, and the soil through 4 months buries experiment, and biological degradation rate can reach 58.8%.Carry out Mechanics Performance Testing according to GB/T 1040.3-2006, transverse tensile strength is 25.9MPa, and elongation at break is 662.90%; Longitudinal tensile strength is 23.7 MPa, and elongation at break is 456.35%, conformance with standard.

Claims (2)

1. an antibacterial starch blending type Based Full-degradable Plastics Film, it is characterized in that, be made up of the raw material of following weight part: W-Gum 60-65, nano imvite 7-9, peanut oil 0.6-0.7, tetrabutyl titanate 1.2-1.4, ramie boon 12-14, polyvinyl alcohol 30-35, food-level white oil 1-1.2, chitosan 2.5-4, tributyl citrate 13-15, mustard oil 2-3, potassium sorbate 1-1.5, stearic acid 2-2.5, kaolin 3-5.

2. a kind of antibacterial starch blending type Based Full-degradable Plastics Film according to claim 1, is characterized in that, be made up of following concrete steps:

(1) baking oven is put into after being mixed with nano imvite by W-Gum, take out after dry 120 minutes under the condition of 130 DEG C, (controlling bath temperature is 30 DEG C after being cooled to room temperature, mixed powder to be utilized sonic oscillation 30-40 minute, ultrasonic power is 100W), then mixed powder is transferred in stirring tank, add tetrabutyl titanate, control temperature is 75 DEG C, after stirring 15 minutes with the speed of 1500 revs/min, continue to add peanut oil, stir 15 minutes, finally take out and put into baking oven, the dry mixed powder namely obtaining surface hydrophobicity process for 60 minutes under the condition of 120 DEG C,

(2) 80-100 object powder is made after the drying of ramie boon through corase grind, fine grinding, then put into nano grinder after mixing with kaolin and be ground into nanoscale powder, mix with chitosan again, kneader is put into after mixing, temperature control 120 DEG C, mediate 20 minutes, release cooling, obtain ramie boon and strengthen material;

(3) mixed powder of surface hydrophobicity modification step (1) obtained mixes with food-level white oil, stearic acid, by colloidal mill dispersion 60-90 minute, then the ramie boon enhancing material that step (2) obtains is added, by in dual-screw pelletizer, melt extrude granulation under the condition of control temperature 170-180 DEG C, obtain the starch masterbatch that diameter is 6mm;

(4) after starch masterbatch, polyvinyl alcohol, tributyl citrate and all the other remaining components that step (3) obtains being mixed at normal temperatures, join in single screw extrusion machine, control temperature carries out hot-melt extruded Blown Film under the processing temperature of 170-180 DEG C, last qualitative rolling, packs and get final product.