KR100578113B1 - Biodegradable Composition for Packaging Cushion and Second Material and, Manufacturing Method thereof - Google Patents

Abstract

The present invention provides a biodegradable packaging buffer composition comprising starch, a cell structure reinforcing agent, and a single or a mixture of two or more selected from plasticizers and humectants, physical property reinforcing agents, foaming aids, and moisture resistance imparting agents. . According to the above configuration

It is possible to produce a buffer material excellent in physical properties and moisture resistance.

In addition, the present invention is a starch alpha degree of 85% or more, molded in a variety of forms including a pellet form, although not particularly limited, preferably a buffer material composition (two-dimensional material) having a water content of 4 to 25% It starts. The two-dimensional material can be directly foamed using a small portable equipment in the field as well as a large extruder for production.

Description

Biodegradable Composition for Packaging Cushion and Second Material and, Manufacturing Method             

1a to d are photographs of two-dimensional materials in the form of powder raw materials and pellets as a composition of the present invention, and finished products of buffer materials prepared by using a large production extruder and a small portable foaming facility, respectively.

a: powder raw material composed of the composition of the present invention

b: pellet-shaped two-dimensional material for portable equipment

c: Biodegradable packaging buffer produced using a large production extruder

d: Biodegradable packaging cushioning material manufactured using small portable foam equipment

The present invention relates to a cushioning material for packaging. In more detail, the composition of the biodegradable packaging buffer material, which is similar to the styrofoam, which has been used as a buffer material for preventing damage, using starch, which is a natural polymer, similarly in appearance, compressive strength and recovery rate, but is completely decomposed by microorganisms present in nature. And it relates to a secondary raw material composition in the form of pellets that can be foamed in a small portable equipment using the same, and a method for producing a buffer material using these compositions as a raw material.

Plastics, one of mankind's greatest inventions of the 20th century, have a variety of outstanding functions such as durability, processability, and chemical resistance, in addition to the advantages of being light and relatively inexpensive, and have contributed greatly to the industrial development and convenience of daily life in other fields. However, the growth of the population and the development of various consumer products industries have resulted in the generation of large quantities of consumable disposable plastic packaging waste, and these plastic wastes remain semi-permanently without being decomposed after being used, causing environmental pollution such as soil, air and water pollution. The seriousness of the situation is increasing day by day. In particular, in the case of styrofoam, since the foam is a large volume and light weight per unit weight, it can be said that the adverse effects on the environmental pollution due to the property of blowing easily in the wind. Due to this, paper or pulp molds, which are natural raw materials, have been put into practical use as substitutes for the existing styrofoam for buffer packaging materials. However, there are infinite limitations of pulp raw materials and domestic reality in which all pulp is imported as well as problems of buffering effect, cost and biodegradation rate. Procurement has the disadvantage that it can ultimately lead to greater environmental problems of deforestation.

In order to improve such a problem, research and development of a biodegradable or environmentally friendly packaging buffer material using raw materials obtainable from nature are in progress. Among them, researches using starch, which is emerging as a new raw material for plastics due to resource abundance, ease of supply, and low price, are being actively conducted, and some products have been commercialized. To date, researches and manufacturing methods for biodegradable or environmentally friendly packaging buffers have been carried out by adding a plasticizer to high amylose starch (more than 45% amylose content) or derivatives thereof and foaming using an extruder (USP 4,863,655), to starch. Method of preparing by adding alcohol derivative (JP Hei-136168), Method of preparing foamed polyurethane substitute using reactant of lignocellulosic and aliphatic polyalcohol in wood flour or chaff (KP 95-18201), Modified starch (JP Patent Application Laid-Open No. 2-298525) and a production method using a starch-based additive, a polypropylene resin, a vegetable blowing agent, and the like have been proposed. The above methods are inherently more environmentally friendly than conventional expanded polystyrene or urethane, have a relatively simple manufacturing method, and do not use foaming gas, whereas compressive strength, restoring force, moisture resistance, or water resistance are higher than conventional styrofoam or polyurethane. It has a relatively weak point. In addition, some proposed methods, such as the use of high amylose starch (USP 4,863,655), are also relatively expensive. In particular, the proposed method up to now is that the composition for foaming itself is mostly a mixture of powder form, so that productivity and working conditions are weak, and the logistics cost is not negligible as the volume per unit weight is large in supplying foamed finished products to the demand source. It remains a problem. Recently, a portable foam molding machine that can be used by directly foaming as required by the customer to reduce the logistics cost has been developed to solve this problem, but the existing molding method is very difficult to foam the foam using the portable equipment. In order to solve this problem, the method according to JP 2722056, which is composed of starch pre-adjusted with alpha degree of 40-80%, is vulnerable to changes in temperature and humidity according to the screw shape, length and season of small thick-walled equipment. There is a phenomenon that it easily crumbles or shrinks after foaming, and production using existing large facilities is also not easy.

The present invention is to solve the problems of the non-degradable styrofoam buffer and the conventional starch-containing packaging buffer, not only completely biodegraded by microorganisms existing in nature, but also excellent mechanical properties such as compressive strength and restoring force, depending on the purpose An object of the present invention is to provide a biodegradable packaging buffer composition provided with moisture resistance to be used in a humid region and a method of manufacturing the buffer using the same.

In addition, another object of the present invention is to provide a secondary raw material composition of a certain type that can be directly foamed or used using a portable equipment in the field as well as a large extruder for production using the composition as a raw material and a method for producing a buffer material using the same. Be in

The present invention provides a biodegradable packaging buffer composition comprising starch, a cell structure reinforcing agent, and a single or a mixture of two or more selected from plasticizers and humectants, physical property reinforcing agents, foaming aids, and moisture resistance imparting agents. .

Hereinafter, the present invention will be described in more detail.

The main raw material of the present invention is starch, which includes natural starch and modified starch. Examples of natural starch include corn starch, waxy corn starch, rice starch, glutinous rice starch, wheat starch, milo starch, potato starch, sweet potato starch, cassava starch, tapioca powder, sago starch, wheat starch, flour and the like. Modified starch includes physically modified starch and chemically modified starch. Examples of physically modified starches include gelatinized starch, roasted starch, acid treated starch and the like of the natural starch. Examples of chemically modified starch include starch oxide starch, alkenylsuccinate starch, acetyladipic acid crosslinked starch, phosphate crosslinked starch, ester starch, alkylated starch, starch grafted with unsaturated monomer. In the present invention, single or two or more mixed starches may be used in the above-described starches.

In general, in order to increase the foaming efficiency and flexibility, preferably, starch such as waxy starch, glutinous rice starch and potato starch, sweet potato starch, cassava starch, tapioca powder, and esterified starch thereof are used. In addition, corn starch, crosslinked starch thereof, alkylated starch, and the like are preferably used to increase the compressive strength, the recovery rate, and the durability. In particular, since the basic physical properties of the starch varies depending on the starch source and the physicochemical modification method, it may be used alone or in combination of two or more kinds of starch.

The total amount of these starches in the composition of the biodegradable packaging buffer is preferably at least 60% and at least 95% mixed. However, even if the biodegradation efficiency and speed is slightly lower, it is possible to obtain a total starch content of less than 60% in order to obtain an environment-friendly buffer composition.

In addition, the starch of the present invention has an alpha degree of 85% or more, and is formed in various forms including pellets, and is not particularly limited, but preferably a buffer material composition having a water content of 4 to 25% (hereinafter referred to as "two-dimensional material"). It is referred to as).

Reagents and catalysts capable of simultaneously inducing graft reactions with starch, which are the main raw materials, in the foaming of the buffer material or in the processing of secondary raw materials in a certain form using the composition may be added to the composition. Examples of such reactants include styrene monomer, vinyl acetate, fumaric acid and its anhydrides, fumaric acid monoethyl ester, maleic acid and its anhydrides. , Itaconic acid, or a mixture of two or more kinds selected from itaconic acid. The reactant is preferably added 0.01 to 15% by weight relative to the total composition weight.

Examples of the reaction catalyst include ammonium persulfate, potassium permanganate, potassium persulfate, benzoyl peroxide, succinic acid peroxide, lauroyl peroxide, and hydrogen peroxide alone or in mixture of two or more thereof. Although these catalysts are not specifically limited, Preferably 1-20 weight% is added with respect to the addition amount of a reagent.

The graft reaction induced by using the reactant and the reaction catalyst is performed by the high temperature and high pressure characteristics of the extruder used in the direct foaming using the composition or the processing of the secondary raw material into a certain form using the composition. In this case, the moisture resistance, flexibility, or recovery rate of the buffer, which is the final product, may be further improved according to the properties of the reactive monomer.

Cell structure reinforcing agents are added to improve the structure of the foamed cell, which can directly affect the mechanical properties of the cushioning material. Examples of cell structure reinforcing agents include one or two or more selected from activated carbon, talc, clay, igneous rock powder, mica powder, kaolin powder, polyvinyl alcohol, polyvinylacetate, and polyoxyethylene. have. The content of these cell structure reinforcing agents is preferably added in an amount of 0.01 to 35% by weight, more preferably 5 to 15% by weight relative to the total weight of the composition.

Plasticizers and moisturizers are added to maintain a constant level of moisture in the final finished product. Compositions in which a plasticizer and a humectant are added are more advantageous in the manufacture of a buffer material using a portable foaming equipment which is particularly sensitive to seasonal changes in temperature and humidity and changes in the processing temperature of the extruder. Examples of such plasticizers and humectants include polyhydric alcohols and derivatives thereof such as ethylene glycol, glycerin, glycerin diacetate, propylene glycol, polypropylene glycol, methoxyethylene glycol, sorbitol, glucose, maltose, fructose, sugar, and the like. There is one kind or a mixture of two or more kinds of sugars. The amount of the plasticizer and the humectant added is not particularly limited, but is preferably 0 to 28% by weight based on the total weight of the total composition.

Examples of physical reinforcing agents include one or two or more mixtures selected from gluten, natural and recycled pulp, reed pulp, cellulose, ethyl cellulose, carboxymethyl cellulose, nitrocellulose and plant powders ground from rice bran, rice hull, reed, and the like. have. The addition amount of the physical reinforcing agent does not require a special limitation, but is preferably 0 to 30% by weight based on the use of the total composition.

Foaming aids are added for uniform foaming of the composition. Examples of such foaming aids include limestone powder, calcium chloride, ammonium bicarbonate, azide compounds, calcium bicarbonate, calcium carbonate, potassium carbonate, magnesium carbonate, sodium ethyl xanthate, potassium ethyl xanthate, sodium amyl xanthate, ammonium carbonate, calcium There is a single or a mixture of two or more selected from acetates. The amount of these foaming aids added is not particularly limited, but is preferably 0.01 to 10% by weight relative to the total weight of the composition.

In addition, the composition of the present invention may be added a predetermined moisture resistance imparting agent in order to prevent shrinkage caused by the hygroscopicity of the buffer material of the starch in the high temperature and high humidity region. Such moisture imparting agents are different depending on the use or required characteristics, for example, paraffin, wax, rosin, lecithin, glyoxal, inorganic water-based agent, oil-based silicone resin, polycaprolactone, polylactic acid, biodegradable poly Biodegradable resins such as esters, conventional general-purpose resins such as polyethylene, polypropylene, polystyrene, peanut oil, cottonseed oil, corn oil, rice bran oil, wheat germ oil, almond oil, avocado oil, poppy seed oil, olive oil, castor oil, There are single or two or more kinds selected from vegetable oils such as sunflower oil, hazelnut oil, walnut oil, pumpkin seed oil and safflower seed oil. The addition amount of these moisture resistance imparting agents does not require special limitation, but is preferably 0 to 20% by weight based on the weight of the whole composition. In particular, when producing a pellet type two-dimensional material provided in a portable foaming equipment, since the internal forming pressure is very small compared to the extruder, a non-lubricating moisture resistance imparting agent is preferable.

Hereinafter will be described a method for producing a biodegradable packaging buffer of the present invention using the composition as a raw material.

Preparation of Direct Foam Foam

For direct foaming, large single or twin extruders for field production (extruders, screw diameters 40 to 90 mm, L / D 10 to 25) can be used. Based on the starch described above, the composition prepared by mixing each component is adjusted to a water content of 10 to 30% and introduced into the extruder, and directly under operating conditions of a barrel temperature of 70 to 300 ° C. and a screw speed of 30 to 550 rpm. Foaming is possible.

The production method of the finished product of the cushioning material using the existing large foaming facility and the transportation method of the demand destination are not only deterioration of workability due to powdery raw materials during production, cleanness and safety in the factory due to dust, but also the volume per unit weight like the existing non-degradable styrofoam. Due to the characteristics of the large buffer material, there is a problem in terms of space utilization related to the loading space, which is more expensive than the commodity value. Therefore, the present invention is a method for producing a secondary raw material in the form of pellets that can be manufactured or used as needed by using a foaming equipment of a compact, mobile and relatively inexpensive foaming equipment at the demand using the composition according to the present invention described above. It includes.

The portable equipment is simple in form of screw, very sensitive to the change of temperature and humidity according to the season and the processing temperature of the extruder. It is a small equipment and has a very short barrel length. At the time of foaming, the desired biodegradable packaging buffer cannot be produced. That is, the screw shape is simple and the barrel length is short, so that the residence time of the raw material in the extruder is too short to sufficiently form the high temperature and high pressure conditions, which are foaming conditions of the raw material in the extruder. Pretreatment of starch, which is the main ingredient of the composition, is necessary so that foaming conditions can be easily formed in the installation.

Production of two-dimensional material

Two-dimensional material can be produced using a known small portable foam molding machine. Such foam molding machine is preferably used a single or twin extruder (screw diameter 40 ~ 90mm, L / D 10-25) with a vacuum vent having a barrel temperature of 70 ~ 250 ℃, a screw speed of 30 ~ 550rpm operating conditions Can be. The two-dimensional material is prepared by putting the composition in the extruder and extruded, and cutting the strand strands. Preferably the composition is a pretreatment process is preferably adjusted to 10 to 30% moisture content.

Manufacture of Shock Absorbing Material Using Portable Foaming Equipment

Pellets of secondary material having an alpha degree of 85% or more and preferably water content of 4 to 25% are introduced into a small portable foaming facility with a screw diameter of 55 mm and L / D 3 to 6, and the barrel temperature is 60 to 240. To prepare a cushioning material by foaming at the operating condition of ℃, screw speed 30 ~ 120 rpm. At this time, the secondary raw material can be manufactured in other forms other than pellets, and in addition to portable equipment, it can be foamed in a large single or twin extruder for field production.

The method for evaluating the biodegradable packaging buffer according to the present invention and the alpha degree for the pellet-shaped two-dimensional material are as follows.

Mechanical property test method of buffer material

1) Recovery rate

The recovery rate is the ratio of the degree of recovery to the original state after deforming the packaging buffer with a constant force, and is the most important physical property among the physical properties required as the packaging buffer.

Restoration rate measurement was performed using a rheometer with a cylindrical probe (50 mm diameter), 50% filled with a sample (cut to 1 cm size and filled into a 55 mm diameter cylindrical container at a constant height) at a rate of 1 mm per second. After compression, the mixture was stopped for 1 minute and then compressed again to measure the recovery rate by the following equation. The measured value was taken the average value after 10 measurements per sample.

Recovery Rate (%) = Force Received During Second Compression / Received During First Compression × 100

2) compressive strength

The compressive strength was measured under the same conditions as the restoring force measurement method using a rheometer as a force required to deform the packing buffer. That is, the buffer material was cut to a size of 1 cm, filled into a cylindrical container having a diameter of 55 mm to a certain height, and then attached to the sample stage, and the sample was deformed to the yield point while moving at a speed of 1 mm per second. At this time, the highest force applied to the sample was the compressive strength, and the average value was taken 10 times by the same method.

Biodegradability of Buffer

Biodegradability assessment was determined by modifying the American Standard Test Method (ASTM G21-70 and 1924-70), and after inserting a sample of uniform size into a solid agar medium, Aspergillus, a fungus commonly found in soil. niger), Aspergillus oryzae, Penicillium funiculosum and Pulluaria pulullans were inoculated and incubated at 32 ± 2 ° C for 15 days. At this time, the degree of covering the mold on the sample was recorded as follows to evaluate the biodegradability.

* Index according to mold growth rate

0% Growth: 0, less than 10% Growth: 1, less than 30% Growth: 2, less than 60% Growth: 3, 60% or more: 4

Moisture resistance (water resistance) test method of buffer material

The moisture resistance test method of the buffer material was compared to the time required until the change of the shape of the buffer material by placing the sample in a beaker filled with water and the buffer material, and less than 2 hours, 2 to 6 hours, 6 to 12 hours or less, 12 to 24 It divided into hours or less and 24 hours or more. That is, the longer the time required for the shape change, the better the moisture resistance was evaluated.

* Moisture Resistance Index

2 hours or less: 0, 2 to 6 hours or less: 1, 6 to 12 hours or less: 2, 12 hours to 24 hours or less: 3, 24 hours or more: 4

Alpha Determination Method

1 g of each sample (with an error range of ± 0.5%) crushed into a suitable sized secondary raw material was put into four prepared 100 ml Erlenmeyer flasks, respectively, A1, A2, A3, A4, and the same one was used as a control. Prepare the flask and make B. Subsequently, 50 ml of water is added to five flasks, and A1 and A2 are heated and boiled for 15 minutes, and then cooled rapidly to room temperature in ice water. 5 ml of 5% daastase solution was added to each of A1, A3, and B, each flask was shaken in a constant temperature water bath and maintained at 37 ± 1 ° C. for 90 minutes. 2 ml of 1N hydrochloric acid was added to each flask and water was added to 100 ml. do. Filter using dry filter paper and take 10 ml of the filtrate into a triangular flask to make a1, a2, a3, a4 and b, respectively. For blank test, take 10 ml of water into an orthogonal triangle flask and add 10 ml of 0.1 N iodine solution to all six flasks. Next, using a stopwatch, 18 ml of 0.1 N sodium hydroxide solution is added to six flasks sequentially at the same time interval, followed by tight mixing, shaking, and mixing, followed by standing for exactly 15 minutes. After 15 minutes of evaporation, the flask was added with 2 ml of 10% sulfuric acid in the same order and time interval as the previous 0.1 N sodium hydroxide solution was added. These young solutions are titrated with 0.1 N sodium thiosulfate solution, and the measured values of a1 to a4 and b are respectively P1 to P4 and q, and the titer of the blank is r, and the alpha degree is determined according to the following equation.

Hereinafter, the technical spirit of the present invention may be more clearly understood through the following comparative examples and examples, and the scope of the present invention is not limited thereto.

<Comparative Example 1>

The existing non-degradable styrofoam cushioning cushion was purchased and used as a control.

<Comparative Example 2>

The paper was used as a control to prevent breakage of the paper material cut to a certain size.

<Example 1>

Into the U Mixer, 20 kg of normal corn starch with 12.3% moisture, 600 g of kaolin powder, 1.2 kg of polyvinyl acetate, 800 g of ethylene glycol, 110 g of potassium carbonate, mixed for 30 minutes, and then adjusted to have a total moisture content of 18%. To prepare a composition for use in a biodegradable packaging buffer. Subsequently, 8 kg of this was taken and a twin extruder having a screw diameter of 50 mm was used to directly foam at the barrel temperature of 120 to 200 ° C. and the rotational speed of the main screw at 300 rpm. Thus, a biodegradable packaging buffer was prepared and used as an evaluation sample. The rest was used at the time of secondary raw material manufacture.

<Example 2>

In a mixer (U Mixer), 20 kg of normal corn starch with water 12.3%, 600 g of kaolin powder, 1.2 kg of polyvinylacetate, 1.1 kg of glucose, 160 g of potassium carbonate, and 1.2 kg of fumaric anhydride as a reactant and a reaction catalyst, benzoyl fur An additional 95 g of oxide was mixed for 30 minutes, and then adjusted to have a total moisture content of 22% to prepare a composition for use in a biodegradable packaging buffer. In the same manner as in Example 1 below, a biodegradable packaging buffer was prepared and used as an evaluation sample, and the rest was used in preparing the secondary raw material.

Example 3

12kg water 12.3% corn starch 12kg, 13.2% water potato starch 6kg, 12.8% water acetyladipic acid crosslinked corn starch 2kg, kaolin powder 600g, polyvinylacetate 1.2kg, natural pulp mill 2kg , 800 g of ethylene glycol, 110 g of potassium carbonate were added and mixed for 30 minutes, and then adjusted to a total content of 20% to prepare a composition for use in a biodegradable packaging buffer. In the same manner as in Example 1 below, a biodegradable packaging buffer was prepared and used as an evaluation sample, and the rest was used in preparing the secondary raw material.

Example 4

20kg of 12.3% corn starch, 1.6kg of polyvinyl alcohol, 1kg of sorbitol, and 110g of potassium carbonate were added to the U Mixer, followed by mixing for 30 minutes by adding 2kg of wax and 1kg of inorganic waterproofing agent as a moisture resistant agent. Next, the total moisture content was adjusted to 18% to prepare a composition for use in a biodegradable packaging buffer. In the same manner as in Example 1 below, a biodegradable packaging buffer was prepared and used as an evaluation sample, and the rest was used in preparing the secondary raw material.

Example 5

Into the U Mixer, 20 kg of 12.3% corn starch, 600 g of clay powder, 600 kg of polyvinyl alcohol, 1.6 kg of sorbitol, 1 kg of potassium carbonate, 560 g of corn oil and a polycaprolactone, a biodegradable resin, are added as a moisture resistant agent. An additional 1.6 kg was added and mixed for 30 minutes, and then adjusted to have a total moisture content of 22% to prepare a composition for use in a biodegradable packaging buffer. In the same manner as in Example 1 below, a biodegradable packaging buffer was prepared and used as an evaluation sample, and the rest was used in preparing the secondary raw material.

<Examples 6 to 7>

About 12 kg each was taken from each of the compositions obtained in Examples 1 and 2 and put into a raw material tank of a twin extruder (Extruder, screw diameter 50 mm, L / D 16) equipped with a vacuum vent, and the barrel temperature was 80 to 120 ° C. and the screw speed. Pellet-shaped secondary raw materials were prepared by cutting the strands extruded and gelatinized at 200 rpm. Subsequently, each of the secondary raw materials takes about 4 kg each and is introduced into a small portable foaming facility with a screw diameter of 55 mm and L / D 6, and foamed and cut under operating conditions of a barrel temperature of 240 ° C. and a screw speed of 75 rpm. Was used as an evaluation sample and the rest was used as foam samples and alpha degree measurement samples of large extruders for factory production.

<Examples 8 to 10>

About 12 kg of each composition obtained from Examples 3 to 5 was taken and put into a raw material tank of a twin extruder (Extruder, screw diameter 50 mm, L / D 16) with a vacuum vent, and barrel temperature 95 to 150 ° C. and screw speed. Pellet-shaped secondary raw materials were prepared by cutting strands extruded and gelatinized at 150 rpm. Subsequently, each of the secondary raw materials takes about 4 kg each and is put in a small portable foaming facility with a screw diameter of 55 mm and L / D 6, and foamed and cut at an operating condition of a barrel temperature of 220 ° C. and a screw speed of 75 rpm to produce buffer materials for each biodegradable packaging. It was used as an evaluation sample and the rest was used as foam sample and alpha degree measurement sample of large extruder for factory production.

<Examples 11 to 15>

6 kg of secondary raw material of each pellet form obtained in Examples 6 to 10 was taken and a large twin extruder having a screw diameter of 50 mm was used for factory production, and the barrel temperature was 120 to 200 ° C. and the rotation speed of the main screw was 300 rpm. Each sample was foamed and cut to prepare a biodegradable packaging buffer, and used as an evaluation sample.

The results of evaluating the mechanical properties, biodegradability, moisture resistance, and the degree of alpha of the secondary raw material of the biodegradable packaging buffer prepared through the above-described comparative examples and examples are as shown in Table 1 below. Can be. In addition, a two-dimensional photograph of the powder raw material and pellets made of the composition of the present invention, and a finished product photograph of a buffer material manufactured by using a large production extruder and a small portable foaming facility, respectively, are attached to FIG. 1.

<Table 1> Results of evaluation of alpha degree of secondary raw materials with mechanical properties, biodegradability, moisture resistance, and uniform form of biodegradable packaging buffer

    division    Recovery rate (%)   Compressive strength (g / ㎠)    Moisture resistance    Biodegradability (culture method)    Alpha Degree (%, 2D)  Comparative Example 1     83.1     953       5       0       -  Comparative Example 2     42.6     328       -       2       -  Example 1     80.8     896       0       4       -  Example 2     83.0     949       One       4       -  Example 3     82.9     872       0       4       -  Example 4     82.6     912       4       3       -  Example 5     83.3     967       5       3       -  Example 6     81.7     929       0       4      93.1  Example 7     82.6     955       One       4      86.4  Example 8     82.4     966       0       4      92.2  Example 9     82.4     945       4       3      91.6  Example 10     83.0     972       5       3      90.3  Example 11     81.2     894       0       4       -  Example 12     82.2     927       One       4       -  Example 13     81.9     908       0       4       -  Example 14     81.3     934       4       4       -  Example 15     82.7     952       5       4       -

The composition according to the present invention is cheaper than conventional styrofoam, and the advantages of being reduced to nature by microorganisms, as well as carbohydrates as a main component, there is no generation of static electricity and less Clinker during incineration can extend the life of the incinerator. It is also very effective in terms of functionality such as recycling after use, especially in mechanical properties and moisture resistance. At the same time, in the case of manufacturing pellet type, it can be produced directly when required by the demand source, thereby reducing logistics costs, reducing production costs, increasing space utilization and improving workability.

Claims (19)

It contains starch with an alpha degree of 85% or higher, cell structure reinforcing agent, and includes only one or two or more kinds of mixed ingredients selected from plasticizers and humectants, physical property reinforcing agents, foaming aids, and moisture resistance imparting agents. 4-25% pellet type biodegradable packaging buffer composition The method of claim 1, Starch is a natural starch or modified starch The method of claim 2, Starch is a natural starch such as corn starch, waxy corn starch, rice starch, glutinous rice starch, wheat starch, milo starch, potato starch, sweet potato starch, cassava starch, tapioca powder, sago starch, wheat starch, wheat flour; Physically modified starch as gelatinized starch, roasted starch, acid treated starch of the natural starch; And chemically modified starches selected from among these: starch oxide, alkenylsuccinate starch, acetyladipic acid crosslinked starch, phosphate crosslinked starch, ester starch, alkylated starch, starch grafted with unsaturated monomer, Mixed starch composition delete delete delete The method of claim 1, The pellet is a composition prepared by extruding the composition under an operating condition of a barrel temperature of 70 to 250 ° C. and a screw speed of 30 to 550 rpm, and cutting strands obtained by gelatinization. The method of claim 1, Starch is a composition in which a single or a mixture of two or more selected from styrene monomer, vinyl acetate, fumaric acid and anhydrides thereof, monoethyl ester of fumaric acid, maleic anhydride and itaconic acid and itaconic acid is grafted The method of claim 1, The cell structure reinforcing agent is a composition comprising one or a mixture of two or more selected from activated carbon, talc, clay, igneous rock powder, mica powder, kaolin powder, polyvinyl alcohol, polyvinylacetate, and polyoxyethylene. The method of claim 1, Plasticizers and moisturizers are selected solely from polysaccharides such as ethylene glycol, glycerin, glycerin diacetate, propylene glycol, polypropylene glycol, methoxyethylene glycol, sorbitol, and derivatives thereof, and sugars such as glucose, maltose, fructose and sugar. A composition that is a mixture of two or more The method of claim 1, The composition enhancer is a composition comprising a mixture of two or more kinds selected from gluten, natural and regenerated pulp, reed pulp, cellulose, ethyl cellulose, carboxymethyl cellulose, nitro cellulose, and plant-based powders of rice bran, rice hull, reed, etc. The method of claim 1, Foaming aid is selected from limestone powder, calcium chloride, ammonium bicarbonate, azide compound, calcium bicarbonate, calcium carbonate, potassium carbonate, magnesium carbonate, sodium ethyl xanthate, potassium ethyl xanthate, sodium amyl xanthate, ammonium carbonate, calcium acetate Compositions that are single or a mixture of two or more The method of claim 1, Moisture resistance imparting agents are biodegradable resins such as paraffin, wax, rosin, lecithin, glyoxal, inorganic water-based agent, oil-based silicone resin, polycaprolactone, polylactic acid, biodegradable polyester, polyethylene, polypropylene , General purpose resins such as polystyrene, peanut oil, cottonseed oil, corn oil, rice bran oil, wheat germ oil, almond oil, avocado oil, poppy seed oil, olive oil, castor oil, sunflower oil, hazelnut oil, walnut oil, pumpkin seed oil, Composition which is single or a mixture of 2 or more types selected from vegetable oils, such as safflower seed oil The method of claim 1, wherein the composition of the present invention is adjusted to a water content of 10 to 30% by weight, and foamed under a condition of a barrel temperature of 70 to 300 ° C and a screw speed of 30 to 550 rpm to produce a biodegradable packaging buffer material. The method of claim 14, The composition is a single or mixture of two or more selected from styrene monomer, vinyl acetate, fumaric acid and its anhydride, monoethyl ester of fumaric acid, maleic acid and its anhydride, and itaconic acid as a reactant capable of inducing graft reaction with starch. How to include more The method according to claim 14 or 15, Extruder is a large single or twin extruder with screw diameter 40 ~ 90mm, L / D 10-25 A method for preparing a biodegradable packaging buffer material by introducing the pellet-type composition of claim 1 into a foaming machine and foaming under a condition of a barrel temperature of 60 to 240 ° C. and a screw speed of 30 to 120 rpm. The method of claim 17, The composition is a single or mixture of two or more selected from styrene monomer, vinyl acetate, fumaric acid and its anhydride, monoethyl ester of fumaric acid, maleic acid and its anhydride, and itaconic acid as a reactant capable of inducing graft reaction with starch. How to include more The method of claim 17, Foaming machine is a small portable foaming device with a screw diameter of 55 mm and L / D 3 to 6

Images