KR102192404B1 - The method of preparing powder type-release agent scattering on plastics film for food packing - Google Patents

Abstract

Add 0.5 to 2% by weight of silica powder to 98 to 99.5% by weight of starch powder, stir for 30 to 50 minutes to homogenize, pulverize into fine powders with a particle size of 12 to 20 μm, and dry to 12±2% moisture content It relates to a method of manufacturing a micropowder type releasing agent sprayed on a synthetic resin film for food packaging of 24° to 35°.

Description

The method of preparing powder type-release agent scattering on plastics film for food packing}

The present invention relates to a method of manufacturing a micropowder type release agent sprayed on a synthetic resin film for food packaging, and specifically, a process of stacking a synthetic resin film and a film to manufacture various packaging products for food packaging, storing in a roll state, cutting and printing Because adhesion or bonding occurs between the film and the film due to the stickiness due to the weak viscosity of synthetic resin, workability deteriorates, and packaging products of defective products are generated. In order to solve such problems, corn starch, potato starch, Add 0.5 to 2% by weight of silicon dioxide fine powder to 98 to 99.5% by weight of one starch selected from tapioca starch, wheat starch, and rice starch, stir for 30 to 50 minutes to homogenize, and then particle size 12 to 20 μm It relates to a method of manufacturing a micropowder type releasing agent that is pulverized with, dried to a moisture content of 12±2%, and sprayed on a synthetic resin film for food packaging with a repose angle of 24° to 35°.

In general, a release agent is applied to a mold when molding plastic or rubber products or used by baking, so that it is easy to take out of the molded product, and it promotes quality improvement by smoothing the surface structure of the molded product without damage. Representative release agents are silicone, poly Ethylene glycol, polyethyrene tetrafluoride, paraffin, and wax.

Due to the recent rapid industrial development, the field of application of the release agent is also expanding, and the form of the release agent is also in various forms such as oil, solution, emalzone, compound, spray, and powder, and oil, solution, and emulsion type are the main types of the present invention. Powder-type release agents are also used as in.

As an example of the prior art, in the process of injection or extrusion by directly adding one of talc powder, mica, kaolin, and silica to a synthetic resin such as PVC, a PVC material containing a large amount of a filler such as calcium carbonate and an injection machine or By reducing the friction with the extruder, the wear loss of the machine can be reduced, and the molded product can be easily taken out of the mold.

As another prior art, Korean Patent Publication (Publication No. 1992-4450, Publication Date: 1992.06.05) introduces the technical details of a powder releasing agent for die-casting, and as a technical content, an inorganic compound used as a lubricant as a solid. As a release agent obtained by mixing a powdery or granular release agent substrate made of one or more inorganic compounds selected from nitrogen enzymes, mica, metal oxides, and nitrogen compounds and an organic compound that imparts adhesion to the release agent substrate, both are in powder or granular form. It also relates to a powder releasing agent for die casting having a coated form of an organic compound on the releasing agent substrate.

Although the above-described release agent is a powdery release agent, it may be referred to as a powdery release agent with a different application field as a release agent for dicasting.

As another prior art, Korean Patent Publication No. 10-899219 (announced date: May 18, 2009) discloses "a water-releasing agent composition in the form of a white powder," and its technical composition, namely, diethylene glycol monostearate, hydrogenated cast oil, Stearic acid, oleic acid, APA (adipic acid), zinc stearate, calcium stearate, ethylenebis stearamide, oleyl palmitamide, various waxes, cellophane, cellulose acetate, sodium alginate, polythimethylsiloxane, polyalkylmethyl At least one substance selected from siloxane, polytetrafluoroethylene, polyfluoro acrylate, polyfluoroether, PE, PP, PVA, perfluorouraulic acid, talc, kaolin, mica and silica 84.8~91.2 Parts by weight; It relates to a white powdery aqueous release agent composition composed of 2.5 to 7.5 parts by weight of a binder and 6.3 to 7.7 parts by weight of a sodium polyacryl maleic copolymer (SPA) as a lubricant comprising maleic acid and acrylic acid.

The above invention is also a powdery release agent, and silica is used as a raw material for the release agent, but the release agent is a powdery release agent applied to die-casting forging molds, which are molds such as pressure molding, injection molding, and thermosetting injection hardening molding using synthetic resin. The release agent of the patent-applied invention can be said to be a release agent that prevents adhesion or adhesion between synthetic resin films for manufacturing packaging products for food packaging materials, so the application fields are different.

In addition, as a conventional technology, the technical details of "release agent for manufacturing ceramic sheet" are introduced in Korean Patent Publication No. 10-1594541 (2016.02.16), and the technical details are by laminating and firing various ceramic sheets including ferrite in large quantities. In the process of manufacturing the sintered body, ceramic powders having an average anisotropy (aspect ratio, A/R) of 2 to 5 are included between the laminated ceramic sheet and the sheet, and the ceramic powder has an average particle diameter (d ₅₀ ) of 3 to 10 μm. It relates to a release agent for producing a ceramic sheet or a release agent for producing a ceramic in which the release agent powder is dispersed in a solvent.

The release agent of the present invention is a powder-type release agent that forms a powdered ceramic sheet between the ceramic sheet and the sheet in the process of firing by stacking the molded ceramic sheets in multiple layers for efficient work in the process of manufacturing a sintered body by molding and firing the ceramic sheet. It is a powdered release agent that prevents the ceramic sheet and sheet from fusing by spraying the release agent of this patent application. This release agent is also a powdered release agent or a roll-type synthetic resin film used in the manufacture of packaging products for food packaging. As a powder type release agent that prevents and removes weak viscosity or adhesion, there are differences in the field of action.

As in the present invention, there is a powder release agent made of starch powder as a powder release agent used in a synthetic resin film for food packaging, but the starch powder is too light, so the loss of the powder release agent is large due to severe scattering and the workability is poor, causing environmental pollution due to deterioration of air quality. In addition, the angle of repose is large and the flowability is poor, so uniform spraying cannot be expected and a large amount of release agent is consumed.

In addition, as a release agent used in synthetic resin films for food packaging, there is a starch release agent coated with wax, but it is rarely used in food packaging films due to the problem of harmfulness, and there are also release agents with colloidal properties such as polyethylene glycol and paraffin, but the problem of stability is uncertain. It is rarely used in the present invention, and the present invention can be said to be a fine powder type release agent that solves the problem of the release agent used in the synthetic resin film for food packaging as described above.

1. Korean Patent Publication (Publication number: 1992-4450) 2. Korean Patent Publication No. 10-899219 (announcement date: 2009.05.18) 3. Republic of Korea Patent Publication No. 10-1594541 (announcement date: 2016.02.16)

First, in the manufacture of an eco-friendly and excellent workability micropowder type release agent composed of starch and silica (silicon dioxide) sprayed on a synthetic resin film for food packaging that is harmless to the human body, which solved the problem of the release agent used in conventional food packaging films,

Second, it is intended to manufacture a fine powder type release agent that can be subjected to release treatment on a large amount of film as a small amount of release agent with uniform spreadability when sprayed on the film by securing an excellent angle of repose to improve flowability.

One step step of homogenizing by adding 0.5 to 2% by weight of silicon dioxide powder to 98 to 99.5% by weight of starch powder and stirring for 30 to 50 minutes;

A two-step process of grinding into fine powders having a particle size of 12 to 20 μm;

A three-step process of drying the pulverized fine powder to obtain a powder release agent having a moisture content of 12±2% and a repose angle of 24° to 35°;

It was possible to achieve the object of the present invention by providing a method of manufacturing a micropowder type release agent sprayed on a synthetic resin film for food packaging consisting of.

The micropowder release agent of the present invention is a micropowder release agent with high releasability by using a small amount of raw materials compared to the conventional starch-only powder release agent. It prevents scattering by binding and bonding silica powder with a high specific gravity to light starch powder. It can be said to be a micropowder release agent sprayed on a synthetic resin film for food packaging, which can reduce the amount of scattering loss of the release agent and at the same time secure an eco-friendly work environment, and improve flowability by greatly reducing the angle of repose and improve the releasability.

The present invention is an eco-friendly micropowder release agent composed of starch and silicon dioxide sprayed on a synthetic resin film for food packaging that is harmless to the human body by solving the problem of the release agent used in the conventional food packaging film. It relates to a method for producing a micropowder type release agent sprayed on a synthetic resin film for food packaging that can impart a release property to a large amount of film as a small amount of release agent with uniform distribution and diffusivity when sprayed on a synthetic resin film for packaging.

One-step process of homogenizing by adding 0.5 to 2% by weight of silicon dioxide powder to 98 to 99.5% by weight of starch powder and stirring for 30 to 50 minutes;

A two-step process of pulverizing the homogenized starch powder and nitrogen dioxide powder into fine powder having a particle size of 12 to 20 μm;

It relates to a method of manufacturing a fine powder type release agent sprayed on a synthetic resin film for food packaging consisting of a three-step process of drying the pulverized fine powder to obtain a powder release agent having a moisture content of 12±2% and an angle of repose in the range of 24° to 35°.

The starch used in the present invention may be one starch selected from corn starch, potato starch, tapioca starch, and rice starch, and among the starches, corn starch may be slightly advantageous in terms of flowability and price, but there is no significant difference. There are differences in the manufacturing method such as the composition ratio of starch and silica, the amount of moisture, and the size of the particle size.

In addition, the angle of repose in the present invention means that when particles such as powder or particles, for example, starch powder, sugar, salt, etc., are placed in a bag or container and dropped and accumulated on a plane through the outlet in a certain amount at a certain point, the conical aggregate is It is formed by connecting the vertical line from the vertex of the cone to the center of the circular bottom of the cone and from one point on the circumference of the bottom to the vertex along the inclined surface in one direction and the center of the circular bottom along the bottom in the other direction. It can be defined as the angle formed by the straight line and the bottom straight line.

As the angle of repose increases, the flowability deteriorates, and as the angle of repose decreases, the flowability improves. When spraying on a film, the functionality of the release agent is increased by spreading uniform distribution, thereby reducing the amount of the release agent used.

Examples will be given in order to examine the composition ratio, moisture content, particle size, and limited range setting of the fine powder release agent of the present invention and the performance of the fine powder release agent.

Add silica to corn starch powder in a weight ratio of 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 1%, 1.5%, 2%, respectively, stirred for 40 minutes, and homogenized powder particle size 12 The fine powder pulverized to a size of ~ 20 μm was dried and adjusted to a moisture content of 12±2% to prepare a fine powder type release agent sprayed on a synthetic resin film for food packaging with a repose angle of 24° to 35°, and is shown in Table 1.

Release agent for fine powder prepared with angle of repose according to the composition ratio of starch and silica, particle size, and moisture content Composition ratio of starch (% by weight) Composition ratio of silica (% by weight) Angle of repose (degrees) 100 0 43°~ 48° 99.9 0.1 41°~ 46° 99.8 0.2 39°~ 44° 99.7 0.3 37°~ 41° 99.6 0.4 35°~ 38° 99.5 0.5 33°~ 35° 99 One 30°~ 32° 98.5 1.5 27°~ 29° 98 2 24°~ 26°

In Table 1 above, the silica composition ratio of 0.5% to 2% is a fine powder release agent of the angle of repose obtained with a composition ratio of the limited range according to the present invention, and the remaining 0% to 0.5% or less of the angle of repose obtained with a composition ratio outside the limited range of the silica composition ratio of the present invention It was added for comparison as a micropowder release agent, and the previously used starch-only release agent has a very large angle of repose in the range of 43° to 48°, and the micropowder type release agent with 2% silica added has an angle of repose of 24° to As shown as a very small 26°, the angle of repose decreases as the amount of silica increases, and as the angle of repose decreases, the flowability improves to improve the function of the release agent, and as the angle of repose increases, the flowability worsens and the performance of the release agent decreases.

In the present invention, the composition ratio of silica is limited to 0.5 to 2%, and the reason is based on the Food Science and Technology (publisher: Semunsa, author: Song Jae-cheol and Yang Han-cheol), and according to the Food Additives Science pages 513 to 515, silica And silica compounds are added to food as a coagulation inhibitor.Silica gel is used in mixed spices by adding up to 2% to salt.In addition, when adding calcium silicate, a silicate compound, to powdered foods, it is stated that less than 2% should be added. Considering this, it can be said that the upper limit of the silica composition ratio is limited to 2%.

In addition, the reason why the lower limit of the silica composition ratio is limited to 0.5% is unavoidable when explaining the moisture content of the fine powder release agent and the size of the particle to be described next, but the starch powder in fine particles is too light and scatters severely, so the amount of scattering loss of starch particles is large. Due to poor performance and deterioration of air quality, it becomes difficult to work. This phenomenon is more severe as the starch powder is finer, and the silica particles have a specific gravity of 2 to 2.5, and the silica particles and the starch particles bind to each other in the homogenization and pulverization processes. It is bonded, but the specific gravity of the bonded unit powder particles increases as the silica powder composition ratio increases, so if the amount of addition is at least 0.5%, scattering can be prevented when spraying the powder release agent on the synthetic resin film, minimizing the scattering loss of the powder release agent. Can and can perform normal job duties.

In order to find out the change in the angle of repose that affects the flowability and releasability according to the moisture content of the fine powder release agent of the present invention, each weight composition ratio within the composition range (0.5 to 2% by weight) of silica shown in Table 1 is 0.5%, 1%, Each of the silicas shown when applying 10%, 11%, 12%, 13%, and 14% of each moisture content weight ratio of the limited range of moisture content (10% to 14%) to each of 1.5% and 2% Table 2 shows the angle of repose range according to the composition ratio and the angle of repose obtained by applying each moisture content to each composition ratio.

Angle of repose when applying each moisture content to each silica composition ratio Silica composition ratio (% by weight) Mold release agent moisture content (% by weight) Particle size of release agent
(㎛) Angle of repose (degrees) 0.5% 10 12 33° 11 14 33.5° 12 16 34° 13 18 34.5° 14 20 35° One% 10 12 30° 11 14 30.5° 12 16 31° 13 18 31.5° 14 20 32° 1.5% 10 12 27° 11 14 27.5° 12 16 28° 13 18 28.5° 14 20 29° 2% 10 12 24° 11 14 24.5° 12 16 25° 13 18 25.5° 14 20 26°

As shown in Table 2, the moisture content of the fine powder release agent is not preferable because the angle of repose increases as the moisture content increases, so the flowability decreases and the releasability also decreases. Since the moisture content corresponds to the maximum value of 35° in the limited range of 24° to 35°, it has to be fixed at 14%, and the smaller the moisture content, the better the flow and releasability, but the effect of the contribution is not large. If the content is reduced to 10% or less, the powder particles of the release agent become lighter, providing a sense of scattering, and the binding force of the powder particles of the release agent is weakened, resulting in the separation of starch powder and silica powder, causing scattering of starch, and loss of the release agent. Of course, it can be said that securing a certain moisture is essential because the release function is greatly reduced.The minimum moisture content must be 10% or more for the reasons described above, and the maximum moisture content (14%) is the minimum limit of the silica composition ratio (0.5%). If the maximum angle of repose (35°) is consistent with the limited range and more than 14% of water is used, the maximum angle of repose is not only deviated from the maximum value of the maximum angle of repose (35°), but also lowers flow and releasability, so the maximum angle of repose must be 14%.

In order to investigate the change in the angle of repose that affects the flowability and release function according to the particle size of the fine powder release agent of the present invention, when the silica composition ratio in Table 2 is 0.5%, the particle size limitation range of the fine powder release agent (12㎛ ~ 20 ㎛) of each particle size of 12㎛, 14㎛, 16㎛, 18㎛, each of the angles of repose appearing when applying each of the 20㎛ is shown in Table 3.

Angle of repose according to particle size of powder release agent Particle size (㎛) 12 14 16 18 20 Angle of repose (degrees) 33° 33.5° 34° 34.5° 35°

In Table 3, the larger the particle size, the larger the angle of repose, the larger the angle of repose, the lower the flow and release function, and the smaller the particle size, the smaller the angle of repose, and the smaller the angle of repose, the better the flow and release function. Even in the rest of the limited composition ratio of silica, it can be seen that when the silica composition ratio is 0.5%, the angle of repose decreases when the fine powder release agent particles are small, and the angle of repose increases when the particles increase.

The limited range of the particle size of the present invention also greatly affects workability along with the moisture content. If the particle size of the fine powder release agent is reduced to 12㎛ or less, the angle of repose decreases to improve flowability and releasability. Because of this, the size of the particles cannot be less than 12 μm, and the size of the powder particles at an angle of repose of 35°, which is the maximum limit of the angle of repose of the present invention, is 20 μm, so the maximum value of the limited range of the particle size of the micropowder release agent of the present invention It has to be fixed at 20㎛.

To find out the performance of the fine powder release agent according to the angle of repose, in Table 3, the silica composition ratio, moisture content, and particle size that can obtain the fine powder release agent of 25°, 30°, and 35° are shown in Table 4. The performance of the powder release agent was investigated.

Silica weight composition ratio (%) Water content (% by weight) Particle size (㎛) Angle of repose (degrees) 2% 12% 16㎛ 25° One% 10% 12㎛ 30° 0.5% 14% 20㎛ 35°

In order to examine the releasability of the micropowder release agents having the angles of repose of 25°, 30°, and 35° in Table 4, 100 g of the release agents at each angle of repose were sprayed onto a polyethylene film having a width of 1 m, resulting in the results shown in Table 5.

Release treatment capacity of release agent according to angle of repose Angle of repose release agent (degree) Release treatment ability of release agent 25° release agent 500㎡ 30° release agent 319㎡ 35° release agent 223㎡

Claims (2)

A first step of homogenizing by adding 0.5 to 2% by weight of silica powder to 98 to 99.5% by weight of starch powder and stirring for 30 to 50 minutes;
A two-step process of pulverizing the homogenized starch powder and silica powder into fine powder having a particle size of 12 to 20 μm; And
A method for producing a fine powder type releasing agent spraying on a synthetic resin film for food packaging consisting of a three-step process of drying the pulverized fine powder to obtain a fine powder releasing agent having a moisture content of 12±2% by weight and a repose angle of 24° to 35°. delete