WO2017007116A1 - Eraser using natural starch composition and containing no plasticizers, and manufacturing method therefor - Google Patents

Abstract

The present invention relates to: an eraser using a natural starch composition and containing no plasticizers; and a manufacturing method therefor and, more specifically, to: a composition for an eraser containing no plasticizers, comprising 1-30 parts by weight of a moisturizer, 1-10 parts by weight of a viscosity controller and 10-40 parts by weight of an abrasive on the basis of 100 parts by weight of starch; an eraser, containing no plasticizers, to be manufactured by extrusion molding the composition for an eraser; and a manufacturing method therefor. According to the present invention, the eraser does not use polyvinyl chloride (PVC) and a phthalate, which have been used in a conventional eraser, so as to be nontoxic and harmless to the human body, thereby enabling children to use the eraser without worry, and is environmentally friendly since endocrine disruptors are not released therefrom and, simultaneously, has excellent letter erasing performance, thereby enabling the intrinsic function of an eraser to be sufficiently exhibited.

Description

Eraser without plasticizer using natural starch composition and method for preparing same

The present invention relates to an eraser that does not contain a plasticizer using a natural starch composition and a method for preparing the same, and more specifically, 1 to 30 parts by weight of a moisturizer, 1 to 10 parts by weight of a viscosity modifier, and 10 to 10 parts by weight of starch. It relates to a composition for an eraser that does not contain a plasticizer, characterized in that it comprises 40 parts by weight, and an eraser that does not contain a plasticizer produced by extruding the composition for an eraser and a method for producing the same.

This application claims priority based on Korean Patent Application No. 10-2015-0095498 filed on July 3, 2015, and all the contents disclosed in the specification and drawings of the application are incorporated in this application.

Sheets made of petroleum resins such as polyvinyl chloride (PVC) are widely used in products such as interior materials and windows and doors of buildings. In particular, films and sheets using PVC are widely used as materials for flooring, wallpaper, decor sheet, various interior sheets, and the like. On the other hand, since commercial resins such as PVC are manufactured by extracting raw materials from petroleum, it is expected that a problem in that biodegradation is not generated when production is reduced and disposed due to limited petroleum resources. In addition, due to the growing interest in environmental problems, PVC-based products have a safety problem, environmental problems, and environmental problems caused by the use of phthalate plasticizer DOP (Dioctyl Phthalate) and various additives. There are problems such as hormonal substances.

Generally, the eraser is made of polyvinyl chloride called PVC. Although polyvinyl chloride is known as one of environmentally harmful substances, it is basically used in almost all plastic products encountered in the life, and it is a level that does not affect health very much because only a very small amount of environmentally harmful substances and environmental hormones are detected. . The vinyl chloride resin is a hybrid polymer containing at least 50% of a vinyl chloride homopolymer and vinyl chloride, and is one of five general-purpose thermoplastic resins produced by suspension polymerization and emulsion polymerization. The vinyl chloride resin is molded by various processing methods such as compound extrusion molding, injection molding, calendering, sol molding, and the like, such as pipes, building interior and exterior materials, electric wires, electric machine products, toys, films, sheets, artificial leather, tapes, and foods. It is widely used as a material for various products from packaging materials to medical supplies. PVC resin is used for various purposes because of its excellent water resistance, chemical resistance, and flame retardancy.However, since the resin is incompletely burned, it is polluted, causing dioxin, which causes environmental pollution. The trend is.

The vinyl chloride resin may be imparted with various additives by appropriately adding various additives such as plasticizers, secondary plasticizers, stabilizers, pigments, fillers, blowing agents, lubricants, and viscosity modifiers. Plasticizers are additives that play a role of improving the processability by reducing the friction coefficient between polymer resins. The types of plasticizers used up to now are very diverse in their types and their uses are different. Plasticizers used in vinyl chloride resins are mainly phthalate plasticizers, especially DEHP (Di-2-EthylHexyl Phthalate), DBP (Di-Butyl Phthalate), DIDP (Di-IsoDecylPhthalate), BBP (Butyl Benzyl Phthalate), and DINP ( Di-IsoNonyl Phthalate) and DNOP (Di-n-Octyl Phthalate) are the most widely used. In particular, diethylhexyl phthalate is widely used because it has a good balance of physical properties such as plasticization efficiency and cold resistance.

However, phthalate-based plasticizers are suspected as endocrine disruptors, or environmental hormones, that enter or hinder the action of hormones in animals or humans, including diethylhexyl phthalate (DEHP) and dibutyl phthalate. (DBP) is particularly dangerous and subject to regulation, requiring alternatives. In addition, DEHP has a low molecular weight and poor heat resistance, which can be easily transformed by heat, causing a demand for substitute materials.

Conventionally used erasers include vinyl chloride eraser (Korean Patent No. 10-0812512), elastomeric eraser (Korean Patent No. 2008-0070547) and natural rubber eraser. Of these, natural rubber erasers are rarely used due to problems in durability, and elastomeric erasers are not used much due to limitations in their ability to erase. Vinyl chloride erasers are mainly used because of their excellent character-writing ability, but the development of replacement erasers is urgent due to the environmentally adverse effects of plasticizers used, especially DEHP and DBP, and the performance of plasticizers. It is true.

Recent studies on non-toxic erasers can be roughly classified into studies using natural polymers and studies using synthetic polymers. As a prior art for representative erasers using natural polymers, Korean Patent Publication No. 2009-0048297 discloses biodegradable microorganisms. Only the extent to which an eraser in which crosslinked natural rubber particles are dispersed in an island form is known in a matrix composed of poly (3-hydroxybutylate-co-3-hydroxyhexanoate) produced.

On the other hand, among these natural polymers, especially starch has been studied for a long time by the researchers for the application of biodegradable plastic material due to the advantages such as low price, abundant yield, excellent biodegradability. This is due to gelatinization of starch by extrusion cooking technology under high temperature and high pressure conditions, and it is difficult to commercialize due to complicated manufacturing process and lack of storage stability. Many studies have been conducted on biodegradable starch such as thermoplastic starch resin prepared by polymerizing extracted starch.

The biodegradable starch is a polysaccharide composed of glucose (glucose), synthesized by plants, and present as a starch particle in cells. Starch particles have different sizes and shapes depending on the type of plant. To collect this, the raw material plants are ground and immersed in cold water, and the starch particles are precipitated downward. Dry starch particles are highly hygroscopic and contain about 20% moisture in air-dry matters. It does not dissolve in cold water but swells and gelatinizes in hot water. The polysaccharides that make up starch particles are divided into two types: amylopectin, which forms a skeletal skeleton and occupies 70 to 80%, and amylose enclosed inside. Amylose is composed of α-1 and 4-bonds of glucose, and amylopectin is formed from a graft by α-1 and 6-bonds. When water is added to the starch particles and heated, the polysaccharide structure becomes chain-like, which is called α-starch. The raw starch polysaccharide has a spiral structure of six turns of glucose and is called β-starch.

In addition, several proteins are present in the mixture, and also contain sugars and lipids. Glue is made by adding a small amount of water to the flour, kneading it, and kneading it in a large amount of water to remove the starch from the water, leaving the sticky mass as a gluten. Insoluble protein in grains such as barley and wheat. Several proteins are mixed and called gluten. When gluten is mixed with 50-70% ethyl alcohol, there are soluble and insoluble ingredients. The former is called gliadin and the latter is called glutenin. The type of flour is divided by the amount of protein it contains, most of which is made up of gluten. The main ingredient for making bread is more than 13% protein, the gravitational ingredient for multipurpose use is 10-13%, and the ingredient for making sweets is 10% or less. The tenacity of gluten has the power to hold gas, which is why bread swells. Wheat flour absorbs water more evenly than other grains and stretches well because of the presence of gluten. Gluten is the basis for processing and cooking flour.

Starch, which is the main component of the natural starch composition of the present invention, begins to pour water and heat, and when the temperature is about 60 to 80 ° C., the starch particles are destroyed and become soft and sticky, which is called gelatinization of starch. Luxurious starch has a good taste, texture, and digestion. Rice, rice porridge, and rice cake are examples of foods that utilize starch luxury. Starch particles are composed of regular micelle structures by strong bonds between molecules. This is called raw starch (β-starch), and the state in which the micelle structure is disturbed is called gelatinization (α-starch).

Soaking the starch in water loosens the tissue between the amylose and amylopectin molecules that form the micelle structure, resulting in loose tissue. When the heat is applied, the spacing between the starch tissues gradually increases and the volume increases, resulting in viscosity. Factors affecting gelatinization of starch include starch type, moisture content, pH and temperature. The smaller the starch particles and the higher the amylopectin content, the higher the gelatinization temperature. Grain starches such as rice and sorghum are slower in gelatinization than documents such as potatoes and sweet potatoes. In addition, gelatinization occurs better with higher moisture content and is promoted by alkali. The minimum temperature at which gelatinization begins depends on the type of starch and the amount of moisture, but starts around 60 ° C. Higher temperatures shorten the gelatinization time.

However, when the luxury starch cools back to a state similar to raw starch, this phenomenon is called aging, and when rice or rice cakes cool, for example. This is because when the amylopectin or amylose molecule constituting the starch particles loses the heat energy in the gelatinized state by collecting the water particles, the water particles deviate to the surrounding space gradually, thereby causing them to become entangled and harden together. This aging phenomenon of starch is also called beta (β).

If the starch is left as such, the amylose, which is not stable unless it is caught on a substrate, loses its internal energy as it cools down, and the amylose gathers together to rearrange and rearrange to show some crystallinity. . In this case, water that is no longer needed escapes out of the tangled amylose and floats. The aging characteristics of the gelatinized starch can be confirmed from the consistency viscosity indicating the degree of viscosity rise when the gelatin gel is cooled in the amylograph. Rice with high amylose content usually hardens the gelatinized frozen gel quickly and does not flow well. Starch hardened by aging is a diffraction pattern in which microcrystals exist by X-ray diffraction like raw starch (β-starch), but it is not a strong curve like raw starch, but returns to the shape like raw starch structurally. It is said to be β'-starch because it is not liver.

If rice, rice, or bread is left at low temperatures for a long time, it is known that it hardens due to aging of starch, resulting in decreased taste and reduced digestibility. The degree of aging varies depending on the variety, the type of food processed, or the storage conditions. The degree of aging varies depending on the hardness of the texture analyzer or the beta-amylase-pulluanase (BP). Can be evaluated by the degree of gelatinization by the α-amylase-iodine method or by the alpha-amylase-iodine method.

The aging of the starch proceeds rapidly at 30-60% moisture, 0 ° C. and slow even in an electric rice cooker (70 ° C.), but aging is also progressing. If the starch food is stored for a long time, it is preferable to freeze it to keep it as aging as possible. In this case, a method of rapidly freezing and thawing rapidly should be applied. When steamed or steamed rice cakes are heated or microwaved again, β'-starch is affected by the excited water molecules that are trapped in the surrounding gaps. Will recover the stickiness.

One object of the present invention is not using any PVC (polyvinyl chloride) used in the conventional eraser is not toxic and harmless to the human body can be used safely in children, do not use plasticizers such as phthalates known as environmental hormones It is an object of the present invention to provide a composition for an eraser containing no environmentally friendly plasticizer that does not release environmental hormones, a plasticizer-free eraser using the same, and a method of manufacturing the same.

In addition, an object of the present invention is to provide a composition for an eraser using natural starch, which is non-toxic, and has excellent letter erasing performance, so that the function of the eraser can be sufficiently exhibited, and an eraser product without a plasticizer using the same.

In order to achieve the above object, in the present invention, 1 to 30 parts by weight of a moisturizer, 1 to 10 parts by weight of a viscosity modifier, and 10 to 40 parts by weight of an abrasive are used for an eraser containing 100 parts by weight of starch. To provide a composition.

The starch may be at least one selected from the group consisting of corn starch, potato starch, sweet potato starch, tapioca starch, rice starch, wheat starch, or modified starch thereof, and the moisturizing agent is glycerin, glycerol, propane triol or It may be at least one selected from the group consisting of polyhydric alcohols.

The viscosity adjusting agent may be at least one selected from gluten, gelatin, collagen and agar, and the polishing agent is calcium carbonate (CaCO ₃ ), magnesium oxide (MgO) and titanium dioxide (TiO ₂ ), talc, bauxite, silica, It may be at least one selected from the group consisting of alumina, magnesium carbonate and calcium hydroxide.

Therefore, in the present invention, it is important to control the gelatinization properties of the starch and the content of insoluble protein and gelatin to impart viscoelasticity, and to use the moisturizer as an eraser to prevent the aging phenomenon.

Preferably, the eraser composition is based on 100 parts by weight of biodegradable starch, 1-10 parts by weight of gluten, 1-30 parts by weight of glycerin for food, 1-10 parts by weight of edible gelatin (collagen), 1-10 parts by weight of agar. It may include parts by weight, 1 to 10 parts by weight of water, and 10 to 40 parts by weight of abrasive.

The starch is characterized in that it is selected from corn starch, potato starch, sweet potato starch, tapioca starch, rice starch, wheat starch, modified starch thereof or mixtures thereof. At this time, starch is obtained from a plant and refers to a granular substance composed of two components, amylose and amylopectin. This starch is dried and preferably in powder form.

These starch powders have an average degree of polymerization of 1,000 or more amylose, which forms gelatinization (α-starch) well through the gelatinization reaction of starch, which is broken down and becomes soft and sticky when the starch is poured at 60 to 80 ° C. More preferably, the average degree of polymerization of amylopectin is 5,000 or more.

Glycerin as the moisturizing agent is preferably used in an amount of 1 to 30 parts by weight based on 100 parts by weight of starch, and in 25 parts by weight or less, the moisturizing property is insufficient, and excessively moisturizing property is imparted at 40 parts by weight or more. It may be accompanied by a decrease in the physical properties of the eraser.

The glycerin preferably contains at least one of 1,2,3-Propanetriol, Glycerin, and Glycerol, and the glycerin is a triglyceride such as palm oil or palm oil. Glycerin may be obtained as a by-product, or triglyceride may be obtained as a by-product while obtaining fatty acids or biodiesel or ester oil through intermolecular esterification with water, alcohol, or fatty alcohol.

The gluten is a component made by combining glutenin and gliadin contained in wheat, barley, oats, etc., and refers to an insoluble protein having a property of being dissolved in water and not released. The gluten is preferably 1 to 10 parts by weight based on 100 parts by weight of starch in maintaining the eraser's elasticity, and over 10 parts by weight may be provided with excessive elasticity to accompany the decrease in the physical properties of the eraser.

The gelatin (collagen) is a kind of derived protein obtained by extracting collagen, which is a natural protein constituting an animal's shell, tendons, cartilage, etc., from boiling water or treating it with dilute alkali or dilute acid (partially moisturized). 250,000 is preferable. The edible gelatin (collagen) is preferably used in an amount of 1 to 10 parts by weight based on 100 parts by weight of starch in order to maintain elasticity and to move away from the eraser mass when the eraser erases letters. Above parts by weight, excessive breakage may be imparted, accompanied by a decrease in the physical properties of the eraser.

The agar is a major component of galactose isolated from red seaweeds such as vulgaris and is a kind of polysaccharide of intracellular viscous polysaccharides containing sulfate groups. In addition to the genus Gelidium, the agar birds include red algae belonging to Grateloupia, Gracilaria, Hypnea and Gigartina, and red algae belonging to several species. White, transparent and glossy, insoluble in cold water but in hot water, it becomes sol. It has the property of gelling when cooling 1.5% liquid of agar to 32 ~ 39 ℃. It is preferable to use 10 parts by weight to keep the elasticity and the eraser from the eraser lump when the eraser erases the text, and to maintain the eraseability, and more than 10 parts by weight of the eraser may be accompanied by a decrease in the physical properties of the eraser.

The abrasive includes at least one selected from calcium carbonate (CaCO ₃ ), magnesium oxide (MgO) and titanium dioxide (TiO ₂ ), talc, bauxite, silica, alumina, magnesium carbonate and calcium hydroxide. In addition to the calcium carbonate, magnesium oxide and titanium dioxide, diatomaceous earth, glass, sericite, quartz powder, montmorillonite, scallops, oyster shells, clam shell powder such as clam shells, egg shell powder, organic hollow particles, inorganic hollow particles, etc. It can also be used in combination with conventional fillers.

 The abrasive is not only maximizes the erase performance of the eraser, but also maintains the mechanical properties such as tensile strength and tear strength and accelerates the crystallization rate of biodegradable starch, and has an inorganic particle size of 1 ~ 50 ㎛ size Particles are more preferable for application to an eraser product, and the particles of 0.5 μm or less are too fine to be difficult to disperse the particles, and they are not good for the grouping and the erase performance of the eraser. It is difficult to achieve what is intended in the invention because there is a characteristic that the eraseability and agglomeration property is reduced when erasing the pencil letters. The inorganic particles are preferable to expect the desired effect to use 10 to 40 parts by weight based on 100 parts by weight of starch. When the content is within the above range, sufficient rubber elasticity is expressed, and the eraser can effectively exhibit the original character erasing performance.

The natural starch composition according to the present invention and the eraser which does not contain the plasticizer using the same are additional additives as desired, and include lubricants, antioxidants, stabilizers, flame retardants, antistatic agents, antibacterial agents, biodegradation accelerators, heat stabilizers, light stabilizers, weather stabilizers It may further comprise at least one selected from ultraviolet absorbers, anti-blocking agents, the content of such additives is preferably used 1 to 10 parts by weight based on 100 parts by weight of starch.

The eraser does not contain a plasticizer according to the present invention can be prepared by extrusion molding the composition for the eraser does not contain the plasticizer, the extrusion process is the temperature of the extruder 30 ~ 120 ℃, the rotation speed of the screw 50 ~ 400rpm It is characterized by that. When the temperature of the extruder exceeds 120 ° C, since the low molecular weight additives used in the invention may volatilize and cause foaming in the product, it is preferable to maintain the temperature of 30 to 100 ° C. In addition, if the rotation speed of the screw is too fast, the residence time of the mixture in the extruder is reduced and the degree of plasticization is reduced due to excessive shear stress, and thermal decomposition of starch is caused by shear heat. Therefore, it is better to maintain the 350 rpm or less more preferably. As the extruder that can be used in the present invention, any known mixing property, such as a single screw extruder, a co-rotating twin screw extruder, a bi-directional rotary twin screw extruder, may be used, but it is more preferable to use a co-rotating twin screw extruder. good.

Method for producing a plasticizer does not contain a plasticizer according to the present invention is a composition manufacturing step of mixing 1 to 30 parts by weight, 1 to 10 parts by weight of a viscosity modifier, 10 to 40 parts by weight of abrasive with respect to 100 parts by weight of starch; And an extrusion molding step of molding the composition using an extruder.

More specifically, based on 100 parts by weight of biodegradable starch, 1 to 30 parts by weight of glycerin for food, 1 to 10 parts by weight of gluten, 1 to 10 parts by weight of edible gelatin (collagen), 1 to 10 parts by weight of agar, A mixture of 10 to 40 parts by weight of abrasive and 1 to 10 parts by weight of one or more additives selected from water are mixed at a discharge temperature of 40 to 70 ° C. in a high speed stirrer of 400 rpm or more, and then a cylinder temperature of 30 to 160 using a co-rotating twin screw extruder. Extrusion is preferably performed at 15 ° C. at a rotational speed of 15 to 400 rpm.

Also, with respect to 100 parts by weight of biodegradable starch, 1 to 30 parts by weight of glycerin for food, 1 to 10 parts by weight of gluten, 1 to 10 parts by weight of edible gelatin (collagen), 1 to 10 parts by weight of agar, abrasive 10 ~ 40 parts by weight, water, heat stabilizer, light stabilizer, weather stabilizer, ultraviolet absorber, 1 to 10 parts by weight of a mixture selected from the anti-blocking agent is mixed with a discharge temperature of 40 ~ 70 ℃ in a high-speed stirrer of 400rpm or more, Extrusion molding is preferably performed at a cylinder temperature of 30 to 160 ° C. using a co-rotating twin screw extruder at a speed of 15 to 400 rpm.

The natural starch composition according to the manufacturing method as described above and the eraser containing no plasticizer using the same have excellent biodegradability and excellent mechanical properties. The eraser composition is environmentally friendly and has good processability and blendability, which enables extrusion and injection molding, and can be manufactured in various forms as well as excellent compatibility with other biodegradable plastics and thermoplastics, thereby improving performance. It can be applied to the desired product range, including various additives.

Eraser according to the present invention does not use PVC (polyvinyl chloride) and phthalate used in the conventional eraser is not toxic and harmless to the human body can be used safely in children, do not emit environmental hormones, environmentally friendly at the same time The erase performance is excellent, and the eraser's original function can be sufficiently exhibited.

Since the eraser composition of the present invention does not use the PVC used in the conventional eraser, no harmful substances such as phthalate-based plasticizers, formaldehyde, and lead are detected, and thus non-toxic children can be used safely, and do not emit environmental hormones. It is environmentally friendly. In addition, the natural starch composition of the present invention and the eraser product without the plasticizer using the same can be fully exhibited the original function of the eraser is superior to the conventional eraser compared to the PVC eraser.

The method of manufacturing an eraser according to the present invention has excellent mixing properties with other biodegradable plastics and thermoplastics, and is excellent in processability and mechanical property stability. The scope of application has a wide range of advantages.

1 is a photograph comparing the plasticizer dissolution degree of the embodiment and the comparative example according to an embodiment of the present invention.

Eraser composition does not contain a plasticizer according to the invention 1 to 30 parts by weight of a moisturizing agent with respect to 100 parts by weight of starch; 1 to 10 parts by weight of at least one viscosity modifier selected from gluten, gelatin, collagen and agar; And 10 to 40 parts by weight of the abrasive.

Hereinafter, the present invention will be described in detail using examples. However, the following examples are merely to illustrate the invention, these examples are for illustrative purposes only and are not intended to limit the protection scope of the present invention. The content of the present invention is not limited by the following examples.

Example 1

400 rpm of a mixture of 20 parts by weight of glycerin for food, 3 parts by weight of gluten, 5 parts by weight of food gelatin (collagen), 5 parts by weight of agar, 30 parts by weight of abrasive, and 5 parts by weight of water, based on 100 parts by weight of biodegradable starch. After mixing for 10 minutes at the discharge temperature of 50 ℃ in the above-mentioned high speed stirrer, using a co-rotating twin-screw extruder at a cylinder temperature of 150 ℃ extruded by a feeder 50 rpm, the main motor 250 rpm to manufacture an eraser It was.

Example 2

With respect to 100 parts by weight of biodegradable starch, a mixture of 3 parts by weight of gluten, 5 parts by weight of edible gelatin (collagen), 5 parts by weight of agar, 30 parts by weight of abrasive, and 5 parts by weight of water was added to a discharge temperature of 50 ° C. in a high speed stirrer of 400 rpm or more. After mixing for a minute, the rotational speed of the screw (rpm) of the screw at a cylinder temperature of 150 ° C. using a co-rotating twin screw extruder was extruded using a feeder 50 rpm and a main motor 250 rpm to prepare an eraser.

Example 3

With respect to 100 parts by weight of biodegradable starch, a mixture of 20 parts by weight of glycerin for food, 5 parts by weight of edible gelatin (collagen), 5 parts by weight of agar, 30 parts by weight of abrasive, and 5 parts by weight of water are discharged from a high-speed stirrer of 400 rpm or more. After mixing for 10 minutes at a temperature of 50 ℃, using a co-rotating twin-screw extruder at a cylinder temperature of 150 ℃ the rpm per screw (rpm) was extruded by a feeder 50 rpm, the main motor 250 rpm to prepare an eraser.

Example 4

To 100 parts by weight of biodegradable starch, a mixture of 20 parts by weight of glycerin for food, 3 parts by weight of gluten, 5 parts by weight of agar, 30 parts by weight of abrasive, and 5 parts by weight of water was added to a discharge temperature of 50 ° C. in a high speed stirrer of 400 rpm or higher. After mixing for 10 minutes, using a co-rotating twin-screw extruder at a cylinder temperature of 150 ℃ the rpm of the screw was extruded by a feeder 50rpm, 250rpm main motor 250rpm to prepare an eraser.

Example 5

With respect to 100 parts by weight of biodegradable starch, a mixture of 20 parts by weight of glycerin for food, 3 parts by weight of gluten, 5 parts by weight of edible gelatin (collagen), 30 parts by weight of abrasive, and 5 parts by weight of water are discharged from a high-speed stirrer of 400 rpm or more. After mixing for 10 minutes at a temperature of 50 ℃, using a co-rotating twin-screw extruder at a cylinder temperature of 150 ℃ the rpm per screw (rpm) was extruded by a feeder 50 rpm, the main motor 250 rpm to prepare an eraser.

Example 6

With respect to 100 parts by weight of biodegradable starch, a mixture of 20 parts by weight of glycerin for food, 3 parts by weight of gluten, 5 parts by weight of edible gelatin (collagen), 5 parts by weight of agar and 5 parts by weight of water is discharged from a high-speed stirrer of 400 rpm or more. After mixing for 10 minutes at a temperature of 50 ℃, using a co-rotating twin-screw extruder at a cylinder temperature of 150 ℃ the rpm per screw (rpm) was extruded by a feeder 50 rpm, the main motor 250 rpm to prepare an eraser.

Example 7

To 100 parts by weight of biodegradable starch, a mixture of 20 parts by weight of glycerin for food, 3 parts by weight of gluten, 5 parts by weight of food gelatin (collagen), and 5 parts by weight of agar were discharged at a high temperature stirrer of 400 rpm or more at 50 ° C. After mixing for a minute, the rotational speed of the screw (rpm) of the screw at a cylinder temperature of 150 ° C. using a co-rotating twin screw extruder was extruded using a feeder 50 rpm and a main motor 250 rpm to prepare an eraser.

Comparative Example 1

After mixing 30 parts by weight of polyvinyl chloride (PVC) resin, 30 parts by weight of plasticizer (DHEP) and 40 parts by weight of calcium carbonate (CaCO ₃ ), the mixture was mixed for 10 minutes at a discharge temperature of 50 ° C. in a high-speed stirrer of 400 rpm or more, and then Using a directional rotating twin-screw extruder at a cylinder temperature of 80 ℃ the RPM per minute (rpm) of the screw was extruded by a feeder 50rpm, main motor 250rpm to prepare a PVC eraser.

Comparative Example 2

After mixing 30 parts by weight of polyvinyl chloride (PVC) resin, 30 parts by weight of plasticizer (DHEP) and 40 parts by weight of magnesium oxide (MgO), the mixture was mixed for 10 minutes at a discharge temperature of 50 ° C. in a high speed stirrer of 400 rpm or more, Using a rotating twin-screw extruder at a cylinder temperature of 80 ℃ the RPM per minute (rpm) of the screw was extruded by a feeder 50rpm, main motor 250rpm to prepare a PVC eraser.

Comparative Example 3

After mixing 30 parts by weight of polyvinyl chloride (PVC) resin, 30 parts by weight of plasticizer (DHEP) and 40 parts by weight of titanium dioxide (TiO ₂ ), the mixture was mixed for 10 minutes at a discharge temperature of 50 ° C. in a high-speed stirrer of 400 rpm or more, and then Using a directional rotating twin-screw extruder at a cylinder temperature of 80 ℃ the RPM per minute (rpm) of the screw was extruded by a feeder 50rpm, main motor 250rpm to prepare a PVC eraser.

Ingredient	Composition content (parts by weight)
	Example 1	Example 2	Example 3	Example 4	Example 5	Example 6	Example 7
Biodegradable starch	100	100	100	100	100	100	100
Glycerol for Food	20	0	20	20	20	20	20
gluten	3	3	0	3	3	3	3
Edible gelatin (collagen)	5	5	5	0	5	5	5
Agar	5	5	5	5	0	5	5
Abrasive (TiO 2 )	30	30	30	30	30	0	30
water	5	5	5	5	5	5	0

Ingredient		Composition content (parts by weight)
		Comparative Example 1	Comparative Example 2	Comparative Example 3
Polyvinyl Chloride (PVC) Resin		30	30	30
Plasticizer (DHEP)		30	30	30
abrasive	Calcium Carbonate (CaCO 3 )	40	0	0
	Magnesium Oxide (MgO)	0	40	0
	Titanium Dioxide (TiO 2 )	0	0	40

Using the erasers prepared in Examples 1 to 7 and Comparative Examples 1 to 3, the appearance, color, erase rate, paper wrinkle, hardness, transferability, and the like were measured for performance. According to the evaluation and the results are shown in Table 4.

standard	Feeling Evaluation Criteria	Crumb Evaluation Criteria
◎	We can erase extremely soft with light touch	Erased debris does not adhere to the paper and sticks well on the paper, and the eraser surface is white
○	You can erase it gently with a light touch.	Erased debris sticks a little on the eraser, and the eraser surface is gray
×	I can't erase it unless I have strong power	There is no lump of erased debris and there is a lot of black carbon on the surface of the eraser.

division	Example 1	Example 2	Example 3	Example 4	Example 5	Example 6	Example 7	Comparative Example 1	Comparative Example 2	Comparative Example 3
Appearance	Good	Good	Good	Good	Good	Good	Good	Good	Good	Good
color	White	White	White	White	White	White	White	White	White	White
Erase rate	90	90	85	85	75	60	90	90	90	90
Paper crumpled	Good	Good	Good	Good	Good	Good	Good	Good	Good	Good
Hardness	70	65	70	70	75	50	72	75	75	75
Performance	Good	Good	Good	Good	Good	Good	Good	Bad	Bad	Bad
Feeling	◎	○	○	○	○	○	○	◎	○	◎
Crumbs	◎	○	○	◎	◎	×	○	○	○	◎
Molding performance	Good	Good	Good	Good	Good	Good	Good	Good	Good	Good
Surface hardness change	Good	Bad	Good	Good	Good	Good	Good	Good	Good	Good
Plasticizer	Good	Good	Good	Good	Good	Good	Good	Bad	Bad	Bad

Erasing rate: KS G 2627 Test Method 80 or more, Hardness: KS G 2627 Test Method 50 or more, Transferability: KS G 2627 Test Method, Plasticizer Elution: Marking the degree of blurring of letters according to the time change after marking with a ballpoint pen on the eraser surface box

The natural nature of the present invention when comparing Examples 1 to 7 with no plasticizer using the natural starch composition of the present invention and Comparative Examples 1 to 3 with PVC resin eraser containing a conventional eraser plasticizer Erasers that do not contain plasticizers using starch compositions showed slightly lower results in terms of some hardness, but conventional eraser plasticizers in terms of overall performance such as appearance, color, erase rate, paper wrinkle, transferability, usability, and crumbness, etc. The result which differed from the PVC resin eraser containing was obtained. Particularly, in the measurement items of plasticizer dissolution properties, as shown in FIG. 1, the PVC resin eraser containing the conventional plasticizer was observed to be blurred in the degree of blurring of letters according to the time change after marking with a ballpoint pen on the surface of the eraser. In the eraser that does not contain a plasticizer using the natural starch composition as an example, no blurring was observed.

Since the eraser composition of the present invention does not use the PVC used in the conventional eraser, no harmful substances such as phthalate-based plasticizers, formaldehyde, and lead are detected, and thus non-toxic children can be used safely, and do not emit environmental hormones. In addition to the environmentally friendly features, the natural starch composition of the present invention and the eraser product without a plasticizer using the same can be fully exhibited the original function of the eraser, even better than the conventional PVC eraser.

Claims (9)

1. 1 to 30 parts by weight of a humectant based on 100 parts by weight of starch;

   1 to 10 parts by weight of at least one viscosity modifier selected from gluten, gelatin, collagen and agar; And

   Eraser composition containing no plasticizer, characterized in that it comprises 10 to 40 parts by weight of an abrasive.
2. The method according to claim 1,

   The starch is a composition for an eraser containing no plasticizer, characterized in that at least one selected from the group consisting of corn starch, potato starch, sweet potato starch, tapioca starch, rice starch, wheat starch, or modified starch thereof.
3. The method according to claim 1,

   The moisturizing agent is a composition for erasers not containing a plasticizer, characterized in that at least one selected from the group consisting of glycerin, glycerol, propane triol or polyhydric alcohol.
4. The method according to claim 1,

   The abrasive is a plasticizer, characterized in that at least one selected from the group consisting of calcium carbonate (CaCO ₃ ), magnesium oxide (MgO) and titanium dioxide (TiO ₂ ), talc, bauxite, silica, alumina, magnesium carbonate, calcium hydroxide. Eraser composition not containing.
5. An eraser not containing a plasticizer, which is produced by extruding the composition for an eraser according to any one of claims 1 to 4.
6. 1 to 30 parts by weight of a moisturizer, 1 to 10 parts by weight of at least one viscosity modifier selected from gluten, gelatin, collagen and agar, and 10 to 40 parts by weight of an abrasive, based on 100 parts by weight of starch; And

   Extruding step of molding the composition using an extruder; Plasticizer containing a plasticizer characterized in that it comprises a.
7. The method according to claim 6,

   The starch is a method of producing a plasticizer containing no plasticizer, characterized in that at least one selected from the group consisting of corn starch, potato starch, sweet potato starch, tapioca starch, rice starch, wheat starch, or modified starch thereof.
8. The method according to claim 6,

   The moisturizing agent is a manufacturing method of an eraser containing no plasticizer, characterized in that at least one selected from the group consisting of glycerin, glycerol, propane triol or polyhydric alcohol.
9. The method according to claim 6,

   The abrasive is a plasticizer, characterized in that at least one selected from the group consisting of calcium carbonate (CaCO ₃ ), magnesium oxide (MgO) and titanium dioxide (TiO ₂ ), talc, bauxite, silica, alumina, magnesium carbonate, calcium hydroxide. Method of manufacturing an eraser containing no.

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