KR20240008781A - Method for producing eco-friendly packaging material or cushioning material using wheat bran and waste biomass - Google Patents

Abstract

The present invention relates to a method for manufacturing eco-friendly packaging or cushioning materials using wheat bran and waste biomass. When manufacturing packaging materials or cushioning materials through the manufacturing method of the present invention, the raw material cost and manufacturing process are reduced by using agricultural by-products and waste biomass. By reducing the time required, production costs can be greatly reduced.

Description

Method for producing eco-friendly packaging material or cushioning material using wheat bran and waste biomass}

The present invention relates to a method of manufacturing eco-friendly packaging or cushioning materials using wheat bran and waste biomass.

Recently, concerns about packaging materials, cushioning materials, and waste have been growing due to the non-face-to-face consumption culture such as food delivery and courier. Online shopping malls and the delivery industry are trying to reduce the use of disposable products or filling materials, but some are pointing out that this is not enough. In particular, as the number of consumers who value eco-friendliness increases, there is a movement in the chemical industry to meet value consumption by mobilizing methods such as using packaging materials or cushioning materials manufactured using renewable raw materials.

Existing widely used packaging materials include plastic products made by injection, extrusion, and thermoforming of synthetic resins such as polypropylene. Expanded polystyrene (Styrofoam) is used as a cushioning material, but it is difficult to recycle and causes environmental problems due to incineration or landfill. It has the disadvantage of causing serious environmental pollution such as hormone leakage, detection of highly toxic dioxin, and air pollution due to incomplete combustion of waste. In addition, when waste plastic is landfilled, it takes hundreds of years to decompose in nature, which is pointed out as the main cause of environmental pollution. To solve this serious problem of environmental pollution, environmentally friendly biodegradable plastics that are biodegraded by microorganisms in the soil, circulate quickly in nature, integrate with nature, and do not cause environmental pollution have become important.

The use of biodegradable plastic products is increasing every year due to changes in people's environmental awareness and government guidelines, but it is still insufficient compared to developed countries. Recently, research on biodegradable plastics has been actively conducted. They are similar to existing synthetic resins in terms of physical properties and processing, and after use, unlike existing synthetic plastics, they are easily decomposed by natural microorganisms and recycled into the environment. Many biodegradable polymers that do not cause pollution are being developed.

Among the biodegradable polymers developed so far, examples of natural biodegradable polymers include starch, cellulose, chitin, chitosan, natural rubber, and pulp, and examples of microbially produced polymers include PHB (Polyhydroxybutyrate), PHV (Polyhydroxyvalerate), and Pulu. Pullulan, Curdlan, Xanthan gum, Alginate, polyamino acids (polyglutamic acid, polarysine), etc. Examples of chemically synthesized biodegradable polymers include polylactic acid. , Polycaprolactone, Polyorthoester, Phosphagene, Diol/Diacid aliphatic polyester, etc. However, most of the raw materials used in these biodegradable polymers are expensive, which increases the cost of the product and increases the burden on consumers. Despite numerous efforts, chemically synthesized biodegradable resins have many problems in using them as resin materials. To solve this problem, research has recently been conducted to develop biodegradable resin compositions using natural materials.

Meanwhile, Korean Patent No. 2203153 discloses ‘Food packaging material using ginkgo biloba extract and manufacturing method thereof’, and Korean Patent Publication No. 2016-0148291 discloses ‘Use of seasoned vegetable skin such as onion peel or garlic peel.’ Although the 'manufacturing method of eco-friendly packaging material' has been disclosed, there is no description of the manufacturing method of eco-friendly packaging material or cushioning material using the wheat bran and waste biomass of the present invention.

The present invention was developed in response to the above-mentioned needs, and the present inventors softened the wheat bran by mixing wheat bran and an aqueous potassium hydroxide (KOH) solution, and mixed the softened wheat bran with waste biomass (rice straw pulverulent, coconut pulverulent or waste biomass). After mixing the ground paper box and treating it with hydrochloric acid to adjust the pH to between 7 and 8, wheat bran clay was prepared, then the wheat bran clay was placed in a mold and heat treated in an oven at 140°C for 8 hours to prepare a three-dimensional structure. . In addition, as a result of measuring the compressive strength after manufacturing the structure with different contents of waste paper box shredded material compared to wheat bran at 9% or 17%, the structure containing 17% waste paper box shredded material was found to be higher than the structure containing 9% shredded waste paper box material. The present invention was completed by confirming that the strength was higher.

In order to solve the above problem, the present invention includes the steps of (1) mixing wheat bran with a basic solution to soften the wheat bran; (2) mixing waste biomass with the softened wheat bran of step (1) and treating it with acid to produce wheat bran clay; and (3) heat-treating the bran clay of step (2) after molding it.

Additionally, the present invention provides a biodegradable packaging material or cushioning material manufactured by the above method.

When manufacturing packaging materials or cushioning materials through the manufacturing method of the present invention, production costs can be greatly reduced by reducing raw material costs and the time required for the manufacturing process by using agricultural by-products and waste biomass. In addition, the packaging material or cushioning material manufactured by the method of the present invention is a biodegradable material and does not cause environmental pollution when discarded after use.

Figure 1 is a photograph showing a structure manufactured using wheat bran and waste biomass (from the left, pulverized rice straw, pulverized coconut, and pulverized waste paper box).
Figure 2 is a photograph showing a structure for wine packaging manufactured by mixing wheat bran with pulverized waste paper boxes, putting wheat bran clay into a mold, and then heat-treating it.
Figure 3 shows the results of measuring the compressive strength after mixing the shredded waste paper box with wheat bran at different contents of 9% or 17% and manufacturing the structure.
Figure 4 shows the results of measuring the compressive strength after mixing the rice straw pulverized material with wheat bran at different contents of 14 or 22% and manufacturing the structure.
Figure 5 shows the results of measuring the compressive strength after mixing coconut by-product (shell) pulverized product with different contents of 14% or 22% and bran and manufacturing the structure.

In order to achieve the purpose of the present invention, the present invention

(1) Softening the wheat bran by mixing the wheat bran with a basic solution;

(2) mixing waste biomass with the softened wheat bran of step (1) and treating it with acid to produce wheat bran clay; and

(3) forming the wheat bran clay of step (2) above and then heat-treating it.

In the method according to one embodiment of the present invention, the basic solution in step (1) is any selected from the group consisting of potassium hydroxide, calcium hydroxide, sodium hydroxide, sodium carbonate, sodium silicate, sodium metasilicate, sodium phosphate, and ammonium hydroxide. It may be one, most preferably potassium hydroxide, but is not limited thereto.

In the method according to one embodiment of the present invention, the acid may be one or more selected from the group consisting of hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, and boric acid, but is not limited thereto.

In the method according to one embodiment of the present invention, the waste biomass in step (2) may be any one selected from the group consisting of rice straw, coconut by-product (husk), and waste paper, but is not limited thereto.

In the method according to one embodiment of the present invention, when the wheat bran in step (1) is mixed with the basic solution, the wheat bran is softened to have jelly-like properties, and the jellied wheat bran is mixed with waste biomass to form a structure. It acts as a binder based on natural materials that can be formed.

Additionally, in the method according to one embodiment of the present invention, the physical properties of the molded product can be adjusted by adjusting the mixing ratio of the softened wheat bran and the waste biomass in step (2).

In the method according to one embodiment of the present invention, the method for manufacturing the biodegradable packaging material or cushioning material is specifically,

(1) Softening the wheat bran by mixing it with a potassium hydroxide solution;

(2) mixing waste biomass with the softened wheat bran of step (1) and treating it with acid to produce wheat bran clay; and

(3) forming the bran clay of step (2) above and then heat-treating it;

More specifically,

(1) Softening the wheat bran by mixing 400 to 600 parts by weight of 1N potassium hydroxide solution with 100 parts by weight of wheat bran;

(2) mixing 8 to 25 parts by weight of waste biomass with 100 parts by weight of the softened wheat bran of step (1) and treating it with acid to prepare wheat bran clay; and

(3) forming the wheat bran clay of step (2) above and then heat-treating it at 130-150°C for 6-10 hours;

More specifically,

(1) Softening the wheat bran by mixing 400 to 600 parts by weight of 1N potassium hydroxide solution with 100 parts by weight of wheat bran;

(2) For 100 parts by weight of the softened wheat bran in step (1), mix 16 to 18 parts by weight of waste paper, 13 to 15 parts by weight of rice straw, or 21 to 23 parts by weight of coconut by-product and treat with acid to prepare wheat bran clay. steps; and

(3) forming the wheat bran clay of step (2) above and then heat-treating it at 130-150°C for 6-10 hours;

More specifically,

(1) Softening the wheat bran by mixing 500 parts by weight of a 1N potassium hydroxide solution with 100 parts by weight of the wheat bran;

(2) With respect to 100 parts by weight of the softened wheat bran in step (1), 17 parts by weight of waste paper, 14 parts by weight of rice straw, or 22 parts by weight of coconut were mixed and treated with hydrochloric acid to produce wheat bran clay adjusted to pH 7-8. manufacturing step; and

(3) forming the bran clay of step (2) above and then heat-treating it at 140°C for 8 hours; it may include, but is not limited to, this.

More specifically,

(1) Softening the wheat bran by mixing 180 to 220 g of wheat bran with 800 to 1,200 ml of 1N potassium hydroxide solution;

(2) mixing 150 to 220 g of waste biomass with the softened wheat bran of step (1) and treating it with acid to prepare wheat bran clay; and

(3) forming the bran clay of step (2) above and then heat treating it at 130 to 150°C for 6 to 10 hours; it may include, but is not limited to, this.

The present invention also provides a biodegradable packaging material or cushioning material manufactured by the above manufacturing method.

Since the biodegradable packaging material or cushioning material of the present invention has excellent compressive strength, it can be used to package industrial products or agricultural products, or to absorb or relieve shock to prevent the contents from being damaged or deformed.

Hereinafter, the present invention will be described in detail by examples. However, the following examples only illustrate the present invention, and the content of the present invention is not limited to the following examples.

Preparation Example 1. Method for producing packaging material or cushioning material of the present invention

Mix 200 g of wheat bran powder and 1,000 ml of 1N potassium hydroxide (KOH), react for 30 minutes until the wheat bran is completely softened, and then mix 1,200 g of the softened wheat bran with waste biomass (rice straw pulverized, coconut shell pulverized material). 170g of water or shredded waste paper box) was mixed. Afterwards, 60 ml of 12N hydrochloric acid (HCl) was added to adjust the pH to between 7 and 8 to prepare wheat bran clay. The bran clay was placed in a mold and heat treated in an oven at 140°C for 8 hours to prepare a structure (FIG. 1). In addition, wheat bran clay prepared by mixing wheat bran with pulverized waste paper boxes was placed in a mold and then heat treated to produce a structure for wine packaging (Figure 2).

Example 1. Measurement of compressive strength of packaging material or cushioning material of the present invention

The content of the pulverized waste paper box was set to 9% or 17%, the content of the pulverized rice straw was set to 14% or 22%, and the content of the pulverized coconut by-product (husk) was set to 14% or 22%, respectively, and mixed with wheat bran to create the structure. After manufacturing, the compressive strength was measured. The compressive strength test was measured according to KS F 2206 [Wood Compression Test Method]. Specifically, the structure was cut to 2cm The compressive strength of the cut structure was measured three times.

As a result, the compressive strength of the structure containing 9% or 17% of pulverized waste paper box was 541 kPa and 1,197 kPa, respectively (Figure 3), and the compressive strength of the structure containing 14% or 22% of pulverized rice straw was, respectively. are 1,142 kPa and 1,052 kPa, respectively (Figure 4), and the compressive strengths of the structure containing 14% or 22% of pulverized coconut shell were confirmed to be 396 kPa and 653 kPa, respectively (Figure 5).

Commercial double-sided corrugated cardboard, which is widely used as an existing packaging material, is classified into types 1 to 4 according to quality standards, and the strengths of these double-sided corrugated cardboard are based on 539 kPa, 687 kPa, 883 kPa, and 1,079 kPa, respectively (Corrugated packaging logistics, 8(36), 101-111, 2001). In view of this, the structure of the present invention will be able to minimize waste generation and disposal costs by replacing existing packaging materials or cushioning materials. In addition, it is possible to manufacture structures with various physical properties by adjusting the mixing ratio of wheat bran and waste biomass, so it will be possible to manufacture them according to the purpose by appropriately mixing wheat bran and waste biomass as needed.

Claims (1)

(1) Softening the wheat bran by mixing 400 to 600 parts by weight of a potassium hydroxide solution of 1 normal concentration with respect to 100 parts by weight of the wheat bran;
(2) For 100 parts by weight of the softened wheat bran in step (1), mix 13 to 15 parts by weight of rice straw or 21 to 23 parts by weight of coconut by-product and treat with hydrochloric acid to prepare wheat bran clay adjusted to pH 7 to 8. step; and
(3) Molding the wheat bran clay of step (2) above and then heat-treating it at 130-150°C for 6-10 hours.