KR102128787B1 - Biodegradable In-mold Container With Improved Impacts Strength, And Method For Manufacturing The Same - Google Patents

Abstract

The present invention relates to a biodegradable in-mold container with improved strength and a manufacturing method thereof, and more specifically, to an in-mold container and a manufacturing method thereof, wherein the in-mold container comprises thermoplastic resin, strength reinforcing agents, biodegradable substances and degradation catalysts at the same time, thereby being degraded in a short period of time and having improved impact resistance and strength.

Description

Biodegradable In-mold Container With Improved Impacts Strength, And Method For Manufacturing The Same}

The present invention relates to an in-mold container having improved strength and biodegradability and a method for manufacturing the same, and more specifically, strength is improved by adding a sub-fuel composed of a strength enhancer, a biodegradable substance, and a decomposition accelerator to a base material of a thermoplastic resin. At the same time, it relates to an in-mold container capable of biodegrading and a method for manufacturing the same.

Plastic containers are widely used for storing food and beverage as well as non-food materials. This is because plastic is optically transparent, easy blow molding, chemical stability, thermal stability, and relatively inexpensive.

1 is an exploded perspective view of an in-mold packaging container package according to the prior art. The in-mold packaging container package shown in FIG. 1 includes a body side, a body bottom portion bent and extended from a lower portion of the body side portion, and a body flange portion bent from an upper portion of the body side portion, and the first in-mold portion on the body side. A de-label is formed, a locking jaw is formed along an inner circumferential surface of the body flange portion, and a container body for accommodating fast food; An inner lid mounted on the locking jaw to seal the inside of the container body and seating a disposable spoon; And an outer lid coupled to the body flange portion to cover the upper portion of the container body.

The in-mold container is generally molded by using a plastic material that is easily molded, for example, polypropylene as a main raw material and adding a lubricant or pigment.

Meanwhile, there is a growing interest in environmental protection worldwide, and the ecosystem is under serious threat due to the indiscriminate disposal of plastics. Of course, plastic containers are recovered and recycled, but recycling is not easy due to various films or pigments attached to prevent container identification or storage deterioration.

Korean Patent Publication No. 2011-0023363

Therefore, the present invention is to solve the problems as described above, it is possible to decompose naturally over time, and does not cause environmental pollution even when discarded, and furthermore, to provide an in-mold container with improved strength than the existing container and a method for manufacturing the same The purpose.

The in-mold container according to the present invention for solving the above problems is characterized by including a thermoplastic resin, a strength reinforcing agent and a biodegradable material.

In addition, the in-mold container according to the present invention further includes a decomposition accelerator, wherein the thermoplastic resin comprises polypropylene, the strength reinforcing agent is talc, the biodegradable material is starch, and the decomposition accelerator is tert-butylmeta. Acrylate (tert-Butyl Methacrylate), the polypropylene, talc, starch and tert-Butyl Methacrylate (tert-Butyl Methacrylate) is 12.2 ~ 13.3: 3.5 ~ 4.3: 0.80 ~ 0.85: 0.035 ~ 0.07 parts by weight ratio It is characterized by being blended, the flat strength is 2.7 kgf/cm 2 or more, and the compressive strength is 370 kgf/cm 2 or more.

In addition, a method of manufacturing an in-mold container according to the present invention comprises: a first step of preparing a raw material mixture by mixing a base raw material and an auxiliary raw material; And a second step of forming a predetermined shape by pressing and heating the raw material mixture; wherein the base raw material comprises polypropylene, and the auxiliary material is at least one of talc, biodegradable material and decomposition accelerator. .

In addition, in the method for manufacturing an in-mold container according to the present invention, the base raw material is composed of a first base raw material of a granular type made of polypropylene and a second base raw material of a granular type made of a pigment and polypropylene. The base raw material and the second base raw material are characterized in that they are mixed at a ratio of 11.5 to 14.8: 0.52 to 0.70 parts by weight.

In addition, in the method for manufacturing an in-mold container according to the present invention, the auxiliary raw material is characterized in that it contains both a biodegradable material including talc and starch, and a decomposition accelerator consisting of tert-Butyl Methacrylate.

In addition, in the in-mold container manufacturing method according to the present invention, the decomposition accelerator consisting of the biodegradable material containing the talc, starch, and tert-butyl methacrylate (tert-Butyl Methacrylate), 1.4 ~ 4.4: 0.61 ~ 0.87: 0.03 It is characterized by being mixed at a ratio of ~0.26 parts by weight.

In addition, in the method for manufacturing an in-mold container according to the present invention, between the first step of preparing the raw material mixture by mixing the base raw material and the auxiliary raw material and the second step of pressing and heating the raw material mixture to form a predetermined shape, Characterized in that it further performs the step of removing the dust.

In addition, in the method for manufacturing an in-mold container according to the present invention, between the first step of preparing the raw material mixture by mixing the base raw material and the auxiliary raw material and the second step of pressing and heating the raw material mixture to form a predetermined shape, Characterized in that it further performs the step of removing moisture.

In addition, in the in-mold container manufacturing method according to the present invention, the first base raw material, the second base raw material, talc, starch, and tert-butyl methacrylate (tert-Butyl Methacrylate), 11.7 ~ 12.5: 0.62 ~ 0.68: 3.5 to 4.2: 0.80 to 0.85: characterized by being mixed at a ratio of 0.03 to 0.08 parts by weight.

According to the in-mold container according to the present invention and a method for manufacturing the same, there is an advantage that a biodegradable material and a decomposition accelerator are additionally mixed, so that it can be decomposed naturally and thus minimize environmental pollution.

In addition, according to the in-mold container according to the present invention and a method for manufacturing the same, there is an advantage of providing an in-mold container having a significantly improved impact resistance and strength compared to a conventional container and a method for manufacturing the same by adding a strength enhancer.

1 is an exploded perspective view of an in-mold packaging container package according to the prior art.
2 is a flowchart illustrating a method of manufacturing an in-mold container according to a preferred embodiment of the present invention.

In this application, the terms “include”, “have” or “have” are intended to indicate the presence of features, numbers, steps, components, parts or combinations thereof described in the specification, but one or more other. It should be understood that features or numbers, steps, actions, components, parts or combinations thereof are not excluded in advance.

In addition, unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by a person skilled in the art to which the present invention pertains. Terms such as those defined in a dictionary used in general should be interpreted as having meanings consistent with meanings in the context of related technologies, and should not be interpreted as ideal or excessively formal meanings unless explicitly defined in the present application. Does not.

Hereinafter, an in-mold container according to the present invention and a manufacturing method thereof will be described.

The in-mold container according to the present invention is an in-mold container that can maintain sufficient strength and has excellent impact resistance, but decomposes naturally over time after disposal, thereby minimizing environmental pollution.

The in-mold container having the above-described function is composed of a thermoplastic resin, a strength reinforcing agent, a biodegradable material, and a decomposition accelerator.

First, the thermoplastic resin is a base material forming a skeleton of an in-mold container, and is composed of a first base material and a second base material.

Here, it is preferable that the first base raw material is a polypropylene material, and the second base raw material corresponds to a range of 15 to 25% by weight of the first base raw material to impart a predetermined color to the same polypropylene material as the first base raw material. Pigments, for example white pigments, are additionally added.

Strength enhancers, biodegradable materials and decomposition accelerators are auxiliary materials, and strength enhancers are added to reinforce the strength of the molded in-mold container. Specifically, the strength reinforcing agent may be talc, but is not particularly limited if it can perform the same function.

The biodegradable material is a material added to induce the natural decomposition of the in-mold container when disposing of the in-mold container, and may be various starches such as corn and potato.

In addition, the decomposition accelerator is a material added to decompose the in-mold container more rapidly, and may be tert-Butyl Methacrylate.

Here, the thermoplastic resin, the strength reinforcing agent, the biodegradable material and the decomposition accelerator are preferably blended in a predetermined ratio, that is, 12.2 to 13.3: 3.5 to 4.3: 0.80 to 0.85: 0.035 to 0.07 parts by weight, and the first base raw material, product 2 Base material, talc, starch, and tert-butyl methacrylate (tert-Butyl Methacrylate) is more preferably mixed at a ratio of 11.7 to 12.5: 0.62 to 0.68: 3.5 to 4.2: 0.80 to 0.85: 0.03 to 0.08 parts by weight Do.

If the above-mentioned compounding ratio is not satisfied, the in-mold container does not have sufficient strength, or rapid decomposition is difficult, so it is preferable that each material is mixed in the above-mentioned compounding ratio range.

Hereinafter, a method for manufacturing the in-mold container according to the present invention will be described.

2 is a flowchart illustrating a method of manufacturing an in-mold container according to a preferred embodiment of the present invention. Referring to Figure 2, the method for manufacturing an in-mold container according to the present invention is a first step of preparing a raw material mixture by mixing the base raw material and the auxiliary raw material, and pressing and heating the raw material mixture to form a predetermined shape It comprises a second step.

First, the first step will be described in detail. The base raw material is composed of a first base raw material and a second base raw material, and the first base raw material is a granular type made of polypropylene. And the second base raw material is the same as the first base raw material with the same polypropylene as a color control agent for imparting a predetermined color to the in-mold container, the granules to which the white pigment corresponding to the range of 15-25% by weight of the first base raw material is additionally added It is a type.

Here, the first base raw material and the second base raw material may be of powder type, but the foreign substances contained in the first and second base raw materials such as dust are removed and granular type is easy to remove excess moisture. It is preferred. The granular type means having a predetermined size or more such as a pellet shape, a spherical shape, or a master batch.

Meanwhile, the first base raw material and the second base raw material may be mixed at a ratio of 11.5 to 14.8: 0.52 to 0.70 parts by weight, more preferably 11.8 to 12.5: 0.64 to 0.68 parts by weight, and if they fall outside the above range, a desired shape As the container is not molded as well, there is a problem in that burrs are generated, so it is preferable that the first base material and the second base material are mixed in the above range.

The auxiliary raw material mixed in the base raw material is composed of a strength reinforcing agent, a biodegradable substance and a decomposition accelerator as described above. The strength enhancer is for reinforcing the strength of the molded in-mold container, and the biodegradable material is used to induce the natural decomposition of the in-mold container when disposing of the in-mold container, and the decomposition accelerator is intended to accelerate the rapid decomposition of the in-mold container. It is a substance to be added.

Examples of these strength reinforcing agents, biodegradable materials and decomposition accelerators may be talc, starch and tert-Butyl Methacrylate.

Here, the mixing ratio of talc, starch and tert-butyl methacrylate is preferably mixed at a ratio of 1.4 to 4.4: 0.61 to 0.87: 0.03 to 0.26 parts by weight, and 3.4 to 4.1: 0.80 to 0.85: It is more preferable to mix in a ratio of 0.03 to 0.08 parts by weight, which is beyond the above range, the in-mold container does not have sufficient strength or is difficult to rapidly decompose, and furthermore, the dispersibility of the raw material during injection is poor and the resin is aggregated in the container. Since this occurs, it is preferable that the auxiliary materials are mixed in the above range.

Meanwhile, the step of removing dust from the raw material mixture may be further performed before molding the prepared raw material mixture.

In order to lower the defective rate of the molded product, the raw materials, that is, the granular type base raw material and the auxiliary material must be mixed very uniformly. However, when some fine dust is mixed in the base raw material, it is desirable to remove the fine dust because it may not be kneaded properly and cause a defective product.

Here, the raw materials and dusts of the granular type can be separated by a gravity-type or sieve separation method using a difference in specific gravity or particle size, and it is possible after mixing as well as before mixing the first base material and the second base material.

In addition, prior to molding the prepared raw material mixture, a step of removing moisture from the raw material mixture may be further performed. When the raw materials contain moisture above a predetermined content, air bubbles are generated in the molding step, which leads to a defect in the molded product. Therefore, it is preferable to dry the moisture to a predetermined concentration or less, for example, it can be heated to a temperature below the melting point of the raw materials for a predetermined time.

Here, the step of removing the moisture of the raw material mixture is preferably performed after removing the dust, which is to minimize the defect rate of the product. That is, if the moisture is removed before removing the dust, it is highly likely that the water will be absorbed again during the dust removal process and on the move, and thus immediately before the extruder process in which the resin is melted to make the final container so that the moisture is contained as little as possible. It is desirable to remove moisture.

The dust removal and water removal steps as described above are possible before mixing as well as before mixing the first base material and the second base material.

The second step is a step of processing a raw material mixture, which is a mixture of the prepared base raw material and the auxiliary raw material, into a predetermined shape.

Specifically, after mixing the base raw material and the auxiliary raw material at a predetermined mixing ratio, a step of molding the in-mold container by applying a predetermined temperature and pressure while putting the final raw material mixture that has undergone the dust removal and moisture removal steps into the mold.

Here, the heating temperature is not particularly limited as long as the base raw material and the auxiliary raw material can be sufficiently melted, but the temperature of the mold may be 190°C to 240°C, and the injection pressure may be 290 to 310 kg/cm2.

It is evident that the mold may vary depending on the shape of the in-mold container to be molded, and the technology of forming the in-mold container by heating and pressing using a mold corresponds to a known technology, so a detailed description thereof will be omitted. do.

Hereinafter, preferred embodiments are provided to help understanding of the present invention. However, the following examples are only provided to more easily understand the present invention, and the contents of the present invention are not limited thereby.

Example 1

A first base raw material composed of 147 kg of granular polypropylene and a second base raw material of granular type in which 1.05 kg of white pigment and 4.2 kg of polypropylene were mixed were prepared, respectively.

The raw material mixture obtained by mixing the first base material and the second base material was removed from the dust mixed with the raw material through a sieve separation method, and then heated at a temperature of 70 to 80°C for 1.5 hours to remove moisture contained in the raw material.

In addition, 14 kg of talc, 6.13 kg of starch and 2.63 kg of tert-Butyl Methacrylate were injected into the prepared base raw material mixture as auxiliary ingredients, and evenly kneaded and put into a mold.

At this time, the temperature of the mold was maintained at 200 to 210°C, and the injection pressure was set to 290 to 310 kg/cm 2.

Example 2

143.15 kg of granular type polypropylene as the first base raw material, 5.60 kg of granular type polypropylene with pigment as the second base raw material, 17.5 kg of talc, 6.65 kg of starch and tert-Butyl Methacrylate It was molded under the same conditions as in Example 1, except that 2.10 kg was kneaded.

Example 3

137.73 kg of granular type polypropylene as the first base material, 5.78 kg of granular type polypropylene with pigment as the second base material, 22.75 kg of talc, 7.0 kg of starch and tert-Butyl Methacrylate It was molded under the same conditions as in Example 1, except that 1.75 kg was kneaded.

Example 4

133.88 kg of granular type polypropylene as the first base material, 6.13 kg of granular type polypropylene with pigment as the second base material, 26.25 kg of talc, 7.35 kg of starch and tert-Butyl Methacrylate It was molded under the same conditions as in Example 1, except that 1.40 kg was kneaded.

Example 5

128.45 kg of granular type polypropylene as the first base material, 6.30 kg of granular type polypropylene with pigment as the second base material, 31.50 kg of talc, 7.70 kg of starch and tert-Butyl Methacrylate It was molded under the same conditions as in Example 1, except that 1.05 kg was kneaded.

Example 6

124.78 kg of granular type polypropylene as the first base material, 6.48 kg of granular type polypropylene with pigment as the second base material, 35.0 kg of talc, 8.05 kg of starch, and tert-Butyl Methacrylate It was molded under the same conditions as in Example 1, except that 0.70 kg was kneaded.

Example 7

119.35 kg of granular type polypropylene as the first base raw material, 6.65 kg of granular type polypropylene with pigment mixed as the second base raw material, 40.25 kg of talc, 8.40 kg of starch and tert-Butyl Methacrylate Molding was performed under the same conditions as in Example 1, except that 0.35 kg was kneaded.

Example 8

Without adding tert-Butyl Methacrylate, 115.5 kg of granular polypropylene as the first base raw material, 7.0 kg of granular polypropylene mixed with a pigment as the second base raw material, and 7.0 kg of talc 43.75 kg And molded under the same conditions as in Example 1, except that 8.75 kg of starch was kneaded.

Comparative Example 1

After mixing the 166.25 kg of granular type polypropylene as the first base raw material and 8.75 kg of granular type polypropylene mixed with the pigment as the second base raw material without adding the auxiliary raw material, the dust removal process and the drying process are omitted and carried out. Molding was performed under the same conditions as in Example 1.

Comparative Example 2

After adding no auxiliary ingredients, kneading 167.13 kg of granular type polypropylene as the first base material and 7.88 kg of granular type polypropylene with pigment as the second base material is kneaded, and then the process of removing dust and drying is omitted. Molding was performed under the same conditions as in Example 1.

Comparative Example 3

After the addition of no auxiliary ingredients, kneading 167.65 kg of granular type polypropylene as the first base raw material and 7.35 kg of granular type polypropylene mixed with a pigment as the second base raw material, the dust removal process and the drying process are omitted and carried out. Molding was performed under the same conditions as in Example 1.

Comparative Example 4

After adding no auxiliary ingredients, kneading 168.0 kg of granular type polypropylene as the first base material and 7.0 kg of granular type polypropylene with pigment as the second base material are kneaded, and then the dust removal process and drying process are omitted and carried out. Molding was performed under the same conditions as in Example 1.

Comparative Example 5

After the addition of subsidiary materials, 168.35 kg of granular type polypropylene as the first base raw material and 6.65 kg of granular type polypropylene mixed with the pigment as the second base raw material are kneaded, and the dust removal process and the drying process are omitted and carried out. Molding was performed under the same conditions as in Example 1.

Comparative Example 6

After the mixing of 168.88 kg of granular type polypropylene as the first base raw material and 6.13 kg of granular type polypropylene mixed with the pigment as the second base raw material without adding the auxiliary raw material, the dust removal process and the drying process are omitted and carried out. Molding was performed under the same conditions as in Example 1.

Comparative Example 7

169.94 kg of granular type polypropylene as the first base material and 5.60 kg of granular type polypropylene with pigment as the second base material are kneaded without adding the auxiliary material, and the dust removal process and drying process are omitted and carried out. Molding was performed under the same conditions as in Example 1.

Comparative Example 8

169.75 kg of granular type polypropylene as the first base material and 5.25 kg of granular type polypropylene with pigment as the second base material are kneaded without adding the auxiliary material, and the dust removal process and drying process are omitted and carried out. Molding was performed under the same conditions as in Example 1.

Base raw material (content) Supplementary ingredients (content) First base raw material (kg) Second base raw material (kg) Talc
(kg) Starch
(kg) T-MBA
(kg) Example 1 14.700 0.525 1.400 0.613 0.263 Example 2 14.315 0.560 1.750 0.665 0.210 Example 3 13.773 0.578 2.275 0.700 0.175 Example 4 13.388 0.613 2.625 0.735 0.140 Example 5 12.845 0.630 3.150 0.770 0.105 Example 6 12.478 0.648 3.500 0.805 0.070 Example 7 11.935 0.665 4.025 0.840 0.035 Example 8 11.550 0.700 4.375 0.875 0.000 Comparative Example 1 16.625 0.875 - - - Comparative Example 2 16.713 0.788 - - - Comparative Example 3 16.765 0.735 - - - Comparative Example 4 16.800 0.700 - - - Comparative Example 5 16.835 0.665 - - - Comparative Example 6 16.888 0.613 - - - Comparative Example 7 16.940 0.560 - - - Comparative Example 8 16.975 0.525 - - -

Note 1) The first base material is polypropylene

Note 2) In the second base material, polypropylene and pigment are mixed at a weight ratio of 8:2.

Experimental Example 1

Impact resistance experiments were conducted based on ASTMD5276-98. Example 1-8 and Comparative Example 1-8, the in-mold containers molded under the conditions were refrigerated, and then five containers for each fertilizer were dropped at a height of 1.2 m to determine whether the appearance was abnormal, and the results are shown in Table 2. Organized.

As can be seen from Table 2, in the case of comparative examples molded from only the first base material and the second base material without adding an auxiliary material, it can be confirmed that the comparatively good or bad is mostly very vulnerable to impact.

On the other hand, in the examples containing two or more kinds of talc, starch and T-MBA, there were no in-mold containers judged to be defective, and all in-mold containers were found to be good or relatively good and very resistant to impact.

In particular, in Examples 6 and 7, it can be seen that all five in-mold containers used in the impact test are good and are the best.

1 time Episode 2 3rd time Episode 4 Episode 5 room
city
Yes Example 1 △ O △ △ O Example 2 O △ △ △ O Example 3 △ O O O △ Example 4 O △ O △ O Example 5 O O △ O O Example 6 O O O O O Example 7 O O O O O Example 8 O O O O O ratio
School
Yes Comparative Example 1 △ △ X X X Comparative Example 2 X △ △ X X Comparative Example 3 X X △ △ X Comparative Example 4 X △ X X △ Comparative Example 5 △ X △ X △ Comparative Example 6 △ X △ X △ Comparative Example 7 △ △ X △ △ Comparative Example 8 △ △ △ X △

(Remark: O is good, △ is relatively good, X is bad)

Experimental Example 2

The flatness and compressive strength of the in-mold container molded under the conditions of Examples 1-8 and Comparative Examples 1-8 were measured, and the results are summarized in Table 3.

The flat strength was measured by applying a 300 mm/min force by laying the test container horizontally with a 500 kgf force using a UTM (Universal Materials Testing Machine) based on the ASTM D256 standard.

The compressive strength was measured by applying a 300 mm/min force by vertically placing the test container with a 500 kgf force using a UTM (Universal Materials Testing Machine) based on ASTM D695 standards.

As can be seen from Table 3, in the case of comparative examples molded from only the first base material and the second base material without adding an auxiliary material, the flat strength is in the range of 1.75 to 1.90 kgf/cm2, while talc, starch and T-MBA In the examples containing two or more kinds of auxiliary materials, it can be seen that the improvement was significantly from 2.53 to 2.93 kgf/cm 2.

Also in the results of compressive strength, the comparative examples are only 160 to 173.2 kgf/cm 2, but in the examples, it can be seen that they increased to 350.7 to 380.2 kgf/cm 2.

In particular, in Examples 6 and 7, it was confirmed that the addition of T-MBA, a decomposition accelerator, together with the starch, which is a biodegradable material, induces the decomposition of the container while significantly improving the flatness and compressive strength compared to the existing in-mold container.

Strength result (kgf/㎠) Flat strength Compressive strength room
city
Yes Example 1 2.53 350.7 Example 2 2.58 358.2 Example 3 2.61 361.3 Example 4 2.63 368.1 Example 5 2.67 370.8 Example 6 2.70 372.0 Example 7 2.85 377.8 Example 8 2.93 380.2 ratio
School
Yes Comparative Example 1 1.85 160.0 Comparative Example 2 1.80 166.0 Comparative Example 3 1.85 162.5 Comparative Example 4 1.80 173.2 Comparative Example 5 1.90 171.7 Comparative Example 6 1.80 159.2 Comparative Example 7 1.75 162.7 Comparative Example 8 1.80 165.0

Since the specific parts of the present invention have been described in detail above, to those skilled in the art, this specific technology is only a preferred embodiment, and the scope of the present invention is not limited thereby. It is obvious to those skilled in the art that various changes and modifications can be made within the scope of the scope and technical thought, and it is natural that such modifications and modifications fall within the scope of the appended claims.

Claims (9)

Thermoplastic resins, strength enhancers, biodegradable materials, and decomposition accelerators,
The thermoplastic resin includes polypropylene, the strength reinforcing agent is talc, the biodegradable material is starch, and the decomposition accelerator is tert-Butyl Methacrylate,
The polypropylene, talc, starch and tert-butyl methacrylate are blended at a ratio of 12.2 to 13.3: 3.5 to 4.3: 0.80 to 0.85: 0.035 to 0.07 parts by weight, and have a flat strength of 2.7 kgf/cm 2 Above, the compressive strength is 370kgf/㎠ or more as an in-mold container manufacturing method,
A first step of preparing a raw material mixture by mixing the base raw material and the auxiliary raw material; And
A second step of forming a predetermined shape by pressing and heating the raw material mixture; including, but the base raw material includes polypropylene, and the auxiliary raw material is any one or more of talc, biodegradable material and decomposition accelerator,
The base raw material is composed of a first base raw material of a granular type made of polypropylene, and a second base raw material of a granular type made of a pigment and polypropylene, wherein the first base raw material and the second base raw material are 11.5 to 14.8: In-mold container manufacturing method characterized in that it is mixed in a proportion of 0.52 to 0.70 parts by weight.
delete delete delete According to claim 1,
The auxiliary raw material is a method for producing an in-mold container comprising all of a decomposition accelerator consisting of a talc, a biodegradable material containing starch, and tert-Butyl Methacrylate.
The method of claim 5,
Decomposition accelerator consisting of the talc, starch biodegradable material and tert-butyl methacrylate (tert-Butyl Methacrylate), characterized in that mixed in a ratio of 1.4 to 4.4: 0.61 to 0.87: 0.03 to 0.26 parts by weight In-mold container manufacturing method.
The method of claim 6,
Between the first step of preparing the raw material mixture by mixing the base raw material and the auxiliary raw material and the second step of pressing and heating the raw material mixture to form a predetermined shape, the step of removing dust from the raw material mixture is further performed. In-mold container manufacturing method.
The method of claim 6,
Between the first step of preparing the raw material mixture by mixing the base raw material and the auxiliary raw material and the second step of pressing and heating the raw material mixture to form a predetermined shape, the step of removing moisture from the raw material mixture is further performed. In-mold container manufacturing method.
The method of claim 6,
The first base material, the second base material, talc, starch, and tert-butyl methacrylate (tert-Butyl Methacrylate), 11.7 ~ 12.5: 0.62 ~ 0.68: 3.5 ~ 4.2: 0.80 ~ 0.85: 0.03 ~ 0.08 weight In-mold container manufacturing method characterized in that it is mixed in a proportion.

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