CN104893004A - Ramie stick reinforced starch-based fully-degradable plastic film and preparation method thereof - Google Patents

Abstract

The invention discloses a ramie stick reinforced starch-based fully-degradable plastic film and a preparation method thereof. The ramie stick reinforced starch-based fully-degradable plastic film is characterized by being prepared from the following raw materials in parts by weight: 60-65 parts of corn starch, 7-9 parts of nano-montmorillonite, 0.6-0.7 part of peanut oil, 1.2-1.4 parts of tetrabutyl titanate, 12-14 parts of ramie sticks, 30-35 parts of polyvinyl alcohol, 12-14 parts of casein, 0.6-0.8 part of liquid paraffin, 11-15 parts of triethyl citrate, 1-1.5 parts of stearic acid and 1.5-2 parts of antioxidant 1010. The plastic film prepared by the preparation method disclosed by the invention is high in strength, the process is convenient to industrially control and capable of realizing industrialized production, and the production raw materials are simple and easily available, and safe and non-toxic; and the product is capable of achieving complete degradation, environment-friendly after being discarded, capable of being prepared into plastic bags, preservative films and the like for food package, and worthy of large-area popularization.

Description

A kind of ramie boon strengthens starch base Based Full-degradable Plastics Film and preparation method thereof

Technical field

The present invention relates to plastics film technical field, particularly a kind of ramie boon strengthens starch base Based Full-degradable Plastics Film and preparation method thereof.

Background technology

Because the minimizing day by day of petroleum resources causes cost increase, tempo slows down Macromolecular materials industry traditional at present, and meanwhile, the problem of environmental pollution that macromolecular material produces highlights day by day, causes the very big attention of society.Natural macromolecular material is a kind of resource of reusable edible, it can be decomposed by the microorganisms the material into environmentally safe, as inorganic molecules material, water and carbonic acid gas etc., and natural macromolecular material has extremely strong plasticity-, can make it to become the desired functional materials with certain special property by multiple method of modifying, therefore, many countries have all dropped into a large amount of manpower and materials to the research and development of natural macromolecular material and have achieved many outstanding achievements.

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, there is unique strong adherence, epithelium snappiness, smoothness, oil-proofness, solvent resistance, protective colloid, gas barrier performance and the water tolerance had through special processing, also there is certain biological degradability simultaneously, have in wet environment under bacterium existent condition and can resolve into water and carbonic acid gas completely in 6 months, it is Biodegradable Materials, but it is higher to degraded environmental requirement in degradation process, degradation speed is made still to seem relatively slow.

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 ramie boon and strengthen starch base 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, coordinate and add the strongthener of ramie boon as starch base Based Full-degradable Plastics Film, can improve thin film strength and waterproof, oil preventing performance, and cost is low, can not produce pollution; Add polyvinyl alcohol and the non-toxic plasticizer triethyl citrate of appropriate ratio, safety non-toxic, can reduce the fusing point of polyvinyl alcohol, is convenient to carry out blended with starch matrix, can improves mechanical property and the water tolerance of film.

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

A kind of ramie boon strengthens starch base Based Full-degradable Plastics Film, is made up: 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, casein food grade 12-14, whiteruss 0.6-0.8, triethyl citrate 11-15, stearic acid 1-1.5, antioxidant 1010 1.5-2 of the raw material of following weight part;

A kind of ramie boon of the present invention strengthens starch base Based Full-degradable Plastics Film, is 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 and be ground into nanoscale powder, mix with casein food grade, after mixing and whiteruss together put into kneader, temperature control 120 DEG C, mediate 10 minutes, release cooling, obtain ramie boon and strengthen material;

(3) mixed powder of surface hydrophobicity modification step (1) obtained mixes with 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, triethyl 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 is by carrying out modification to traditional technology, 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; Utilize ramie boon as the strongthener of Based Full-degradable Plastics Film, have good water-fast, oil resistance, intensity is high, improves thin film strength, can be dissolved, and cost is low, turns waste into wealth after use by environment, can not produce pollution.

The plastics film that the present invention makes, intensity is high, and technique is convenient to Industry Control, can realize suitability for industrialized production, and raw materials for production is simple and easy to get, safety non-toxic; Product can reach degradable, and abandon rear environmentally friendly, can make Food-packing plastic bag, preservative film etc., worth big area is moved back extensively.

Specific embodiments

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

A kind of ramie boon strengthens starch base Based Full-degradable Plastics Film, is made up: W-Gum 60, nano imvite 7, peanut oil 0.6, tetrabutyl titanate 1.2, ramie boon 12, polyvinyl alcohol 30, casein food grade 12, whiteruss 0.6, triethyl citrate 11, stearic acid 1, antioxidant 1010 1.5 of the raw material of following weight part (kilogram);

A kind of ramie boon of the present invention strengthens starch base Based Full-degradable Plastics Film, is 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 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 and be ground into nanoscale powder, mix with casein food grade, after mixing and whiteruss together put into kneader, temperature control 120 DEG C, mediate 10 minutes, release cooling, obtain ramie boon and strengthen material;

(3) mixed powder of surface hydrophobicity modification step (1) obtained mixes with 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, triethyl 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 62.8%.Carry out Mechanics Performance Testing according to GB/T 1040.3-2006, film thickness is 0.03 millimeter, and transverse tensile strength is 24.9MPa, and elongation at break is 660.85%; Longitudinal tensile strength is 22.5 MPa, and elongation at break is 446.10%, conformance with standard.

Claims (2)

1. a ramie boon strengthens starch base 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, casein food grade 12-14, whiteruss 0.6-0.8, triethyl citrate 11-15, stearic acid 1-1.5, antioxidant 1010 1.5-2.

2. a kind of ramie boon strengthens starch base Based Full-degradable Plastics Film according to claim 1, it is characterized in that, is 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 and be ground into nanoscale powder, mix with casein food grade, after mixing and whiteruss together put into kneader, temperature control 120 DEG C, mediate 10 minutes, release cooling, obtain ramie boon and strengthen material;

(3) mixed powder of surface hydrophobicity modification step (1) obtained mixes with 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, triethyl 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.