KR20210020529A - Methods for manufacturing bioplastic biodegradable compounds and polymeric composite materials - Google Patents

Abstract

The present invention relates to a composition of a bioplastic polymer composite material for extrusion and injection, containing a biodegradable polymer and glass beads, and a method for manufacturing the same. The bioplastic composite material composition for extrusion and injection according to the present invention is not only economical, but also has sufficient physical properties, that is, lubricity, suitable for extrusion and injection molding. Accordingly, it is possible to manufacture a composite material product by using a porous herbaceous plant so that biodegradability of a bioplastic product can be obtained as well as reducing the usage of general composite resins and reducing carbon footprint.

Description

Bioplastic biodegradable compounds and polymeric composite materials {Methods for manufacturing bioplastic biodegradable compounds and polymeric composite materials}

The present invention relates to a biodegradable extrusion and injection bioplastic composite material containing a biodegradable polymer and glass beads, and a manufacturing method thereof.

Since a long time ago, general resins and biomass materials have been mixed and used as bioplastic products for extrusion and injection, so biomass materials can be considered as impurities of general resins. The more such impurities, the less smooth the resin system is. This is an important cause of injection molding and also lowers productivity.In detail, in general, plant biomass is separated by mold release due to microdispersion between biomass and resin when increasing the test amount of olefin resin and compound. Of course, the pressure rises due to the decrease in flow, so that gas generation and carbonization are severe, so that it is not produced during extrusion and injection molding, as well as the problem of deteriorating the physical properties of the product and leaving gas marks on the surface due to the gas generated inside the mold, significantly reducing the value of the product. Will occur.

In addition, in Korean Patent Publication Nos. 10-2011-0056037 or 10-2011-0134987, organic natural powders such as hemp, flax, jute, hemp, rice straw, wood powder, and rice hull, which are natural plant materials, are biodegradable resins and petroleum resins. Biocomposites have been disclosed for a biocomposite material that is added to and compounded and then subjected to extrusion or injection processes to produce a product, but no bioplastic composition for extrusion and injection with improved lubrication has been disclosed.

Therefore, instead of polymer materials focusing on functionalization, it minimizes environmental pollution such as protection of nature, reduction of carbon dioxide generation, and recycling of resources, and in general, bioplastics consider environmental properties, but they are expensive, so it is limited to be commercialized as raw materials for extrusion and injection related to household products. There is.

(KR) Patent Publication 10-2011-0056037 "Method for manufacturing composite material containing biodegradable polymer resin" (KR) Patent Publication 10-2011-0134987 "Method for manufacturing biodegradable biocomposite materials"

An object of the present invention is to provide a biodegradable resin containing biodegradable polymer composite material and having physical properties suitable for extrusion and injection molding at low cost, and a bioplastic composition for extrusion and injection and a method for manufacturing a composite material including biomass and glass beads do.

The method of manufacturing the biodegradable composite material of the present invention for achieving the above object will be described in more detail as follows.

Bioplastic composition comprising 35 to 140 parts by weight of porous herbal biomass, based on 100 parts by weight of the base polyolefin count ratio used as the raw material, and a bioplastic composite composition for extrusion and injection further comprising 1.2 to 42 parts by weight of glass beads Provides. The base polyolefin resin is a polypropylene resin (PP), characterized in that it provides a bioplastic composition, and provides a bioplastic composition further comprising the peroxide.

Preparing a porous herbal biomass in a powder phase; Preparing a mixture by impregnating the base olefin resin and the porous herbal biomass; Extrusion and injection bioplastic comprising the step of adding glass beads to the mixture It provides a method of preparing the composition.

In the above specific example, it provides a method for producing a bioplastic composition for extrusion and injection, characterized in that a peroxide is additionally added, and prepares 35 to 140 parts by weight of porous herbal biomass based on 100 parts by weight of the base polyolenic resin. It provides a method for producing a bioplastic composition for extrusion and injection, characterized in that, and provides a method for producing a bioplastic composition for extrusion and injection, characterized in that the glass beads are 1.2 to 42 parts by weight.

Porous herbaceous plants such as grain husks, rice straws, barley stalks, corn stalks, etc. are pulverized into a porous powder form. Powdery porous herbaceous biomass is essentially a natural product, so it contains moisture and gas and contains specific gravity. This is low, and there is a problem that it does not rise easily even when trying to raise the softening point of other resins compounded together. This is because the porous natural product releases the temperature easily and the specific gravity is low when kneaded with the resin, resulting in a lower coefficient of friction. In the present invention, the inorganic filler is impregnated into the porous pores to increase the specific gravity and at the same time reduce the amount of gas generated during the extrusion process. In addition, for the purpose of preventing re-absorption of moisture, etc. A coating agent may be used. Furthermore, in order to further improve physical properties, a powdery red algae extract may be additionally included. Through this process, the physical properties of the porous herbaceous biomass can be somewhat improved. In the present invention, the inorganic filler 6 To 22 parts by weight, 0.6 to 3.5 parts by weight of a surface coating agent, 1.2 to 12 parts by weight of powdery red algae extract may be used. Powdery porous herbal biomass, inorganic filler, surface coating agent, powdery red algae extract are blended, By kneading, the pores are impregnated with other materials and coated. It is preferable to coat the powdery herbal biomass impregnated with inorganic fillers by medium-temperature heating from 80 to 100 degrees for 18 to 35 minutes during kneading.

In one embodiment of the present invention, plastic materials are widely used as various molded products, packaging materials, industrial materials, consumer materials, etc. due to excellent physical properties, various functions, and low prices. However, these products do not decompose naturally within an appropriate period, which is a cause of serious environmental pollution. As a method for disposing of such plastic waste, conventional methods such as landfill, incineration, and recycling have been taken, but problems with each of these products For this reason, studies on degradable plastics that can be completely decomposed into water, carbon dioxide, methane gas, etc. within months to years are being conducted in various ways. In some developed countries, the use of biodegradable plastics has already reached a considerable level. Degradable plastics are largely biodegradable plastics, where plastics are decomposed by microorganisms and enzymes, photochemically, and photochemically, due to radiant heat from sunlight and sunlight. It can be classified into photodegradable plastics where plastic decomposition occurs due to the breakdown of molecular chain bonds by thermal reaction, oxidative decomposition plastics where plastics decompose by oxidation reactions due to the influence of temperature, and hydrolyzed plastics that decompose by hydrolysis reactions. I can.

In one embodiment of the present invention, the lubricant for plastics is used to prevent thermal decomposition by reducing frictional heat generated during bonding or strengthening affinity and proper mixing and extrusion between the blend containing herbal biomass and the synthetic resin. As an added component, even if these are added, they provide smooth workability while maintaining the mechanical properties similar to those of the base material. As the lubricant, one or a mixture of two or more selected from the group consisting of stearic acid salt, palmitic acid salt, and lauric acid salt, which are natural products having high environmental friendliness, may be used. More preferably, calcium stearic acid, zinc stearic acid, or a mixture thereof may be used. If too little plastic lubricant is used, the effect as a sufficient lubricant during molding is insufficient, and when used in excess, internal bonding occurs or during molding. Carbide or gas flow marks may occur, which may impair aesthetics.

According to the present invention having the above characteristics, the biodegradable bioplastic composite composition for extrusion and injection is not only very economical, but also provides a material suitable for extrusion and injection molding, that is, a bioplastic composite composition with sufficient lubricity. As well as biodegradability, carbon reduction can be achieved by reducing the amount of resin in general and using porous herbaceous plants.

1 is a composition of a biomass resin of bioplastic, which is a composite material of extrusion and injection according to an embodiment of the present invention.

Hereinafter, the components and technical features of the present invention will be described in more detail through the following embodiments.

First, the amount of porous biomass and PP resin is the same as the raw material composition required for the production of the present invention, but the MI of the PP resin is 17, 23, 35, 48, and each of the large low groups is 1 to 3, A PP resin-based pellet-type bioplastic composition containing mass was prepared, and the MI of the produced bioplastic composition pellets was rapidly decreased to 3.5, 7.0, and 17, respectively, so in this state, it was used as a resin for extrusion and injection. It was unsuitable for use.

Analysis of the above mixed raw materials shows that when peroxide is added, the flowability of the biomass-containing plastic resin is improved by about 3.5 to 5.5 times. How much does the MI of the base resin of the raw material affect? It is likely that the amount of peroxide affects more than that, and a sufficient degree of MI can be achieved by controlling the amount of peroxide as desired. The melting point of the mold release extruder is increased to obtain the effect of not requiring additional coating on the outer surface of the product after molding without additional injection to increase the mixing power, and the extraction process is carried out.

Existing products are log-type rods with a full round or square shape when taken out, and this form has a limit on productivity due to increased mechanical pressure during extrusion molding. Also, the size of 210cm-240cm has significant weight. As it is too heavy compared to, it affects the installation work as well.

Based on 40 parts by weight of polypropylene resin (Lotte Chemical's PPs), 45 parts by weight of porous biomass E of Example 1 is impregnated with 15 parts by weight of average particle diameter calcium carbonate to 45 parts by weight of dried average particle diameter porous herbaceous agricultural by-products To prepare an impregnation mixture. 1.7 parts by weight of palm oil as a coating agent was added to the impregnation mixture to prepare an impregnating mixture coated with the surface, and 5,7,10,17,35 parts by weight of glass beads along with 0.4 parts by weight of maleic anhydride as a compatibilizer in the impregnated mixture subjected to high-speed training It was additionally added and utilized in the preparation. Table 1 shows the changes thereto.

Until now, the present invention has been described with reference to exemplary embodiments, but those skilled in the art to which the present invention pertains can make various changes without departing from the scope of the present invention, and that elements thereof can be replaced with equivalents. You will know. In addition, many modifications may be made to the teachings of the present invention by making many modifications without departing from the essential scope of the present invention. Therefore, it is limited to the specific embodiments disclosed as the best mode contemplated for practicing the present invention. Rather, the present invention should be construed as including all embodiments falling within the scope of the appended claims.

20: Glass Bead 30: Biomass + Resin + Glass Bead
100: cylinder 200: bioplastic molding

Claims (1)

Preparing a base polyolefin-based resin;
Preparing 35 to 140 parts by weight of powdery porous herbal biomass based on 100 parts by weight of the base polyolefin-based resin;
Preparing an impregnation mixture by impregnating the base polyolefin resin and the porous herbal biomass;
Including the step of adding 0.0002 to 10 parts by weight of peroxide and 1 to 40 parts by weight of glass beads based on 100 parts by weight of the base polyolefin resin to the impregnation mixture, wherein the lubricity of the plastic resin including biomass is improved 4-6 times. Extrusion and injection bioplastic composite material manufacturing method, characterized in that.

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