KR20240106071A - Lightweight foam composition using waste plastic and method for manufacturing lightweight foam using the same - Google Patents

Abstract

The present invention provides a lightweight foam composition using waste plastic and a lightweight foam manufacturing method using the same, including lightweight waste plastic powder obtained by pulverizing lightweight waste plastic; Rubber base materials including Acrylonitrile Butadiene Rubber (NBR), Natural Rubber (NR), EPDM, and Stylene Butadiene Rubber (SBR); polyolefin resin; additive; crosslinking agent; and a foaming agent; characterized in that it is composed of a mixture.
In addition, the lightweight waste plastic powder is characterized in that it is in the form of chips with a size of 1 to 50 mm.
In addition, based on 100 parts by weight of the mixture of the lightweight waste plastic powder and the rubber base, 10 to 60 parts by weight of the lightweight waste plastic powder and 40 to 90 parts by weight of the rubber base are included.
In addition, the additive is characterized in that it contains zinc oxide (ZnO), stearic acid, titanium dioxide, calcium carbonate, and magnesium carbonate.
And, a first step of crushing the lightweight waste plastic to form lightweight waste plastic powder; A second step of mixing the formed lightweight waste plastic powder with a rubber base and vulcanizing it to form a compound; A third step of dispersing the formed compound to form a finely dispersed compound; A fourth step of producing a lightweight foam by mixing the finely dispersed compound with a polyolefin resin, additives, crosslinking agent, and foaming agent.

Description

Lightweight foam composition using waste plastic and method for manufacturing lightweight foam using the same}

The present invention relates to a lightweight foam composition, and more specifically, to a lightweight foam composition using waste plastic with improved properties such as durability and lightness, and a method of manufacturing lightweight foam using the same.

Korea's annual per capita plastic consumption is 98.2 kg, significantly exceeding the consumption of major countries such as the United States, Japan, and France. In terms of the high usability and convenience of plastic, it is practically impossible not to use plastic unless a new material that can replace plastic is developed.

As plastic consumption increases, the amount of waste plastic generated is also increasing every year. Until now, waste plastics have usually been disposed of through landfill or incineration, but disposal of waste plastics through landfilling has the problem of additional landfill costs, and disposal of waste plastics through incineration generates harmful gases, creating secondary air pollution. There was a problem with contamination.

In order to solve the above problems, various methods for recycling and reusing waste plastic are being actively researched.

Korean Patent Publication No. 10-2022-0162221

The present invention is intended to solve the above-mentioned problems, and the purpose of the present invention is to provide a lightweight foam composition using waste plastic with improved properties such as durability and lightness, and a method for manufacturing lightweight foam using the same.

In order to achieve the above-described object, the present invention provides a lightweight foam composition using waste plastic and a lightweight foam manufacturing method using the same, including lightweight waste plastic powder obtained by pulverizing lightweight waste plastic; Rubber base materials including Acrylonitrile Butadiene Rubber (NBR), Natural Rubber (NR), EPDM, and Stylene Butadiene Rubber (SBR); polyolefin resin; additive; crosslinking agent; and a foaming agent; characterized in that it is composed of a mixture.

In addition, the lightweight waste plastic powder is characterized in that it is in the form of chips with a size of 1 to 50 mm.

In addition, based on 100 parts by weight of the mixture of the lightweight waste plastic powder and the rubber base, 10 to 60 parts by weight of the lightweight waste plastic powder and 40 to 90 parts by weight of the rubber base are included.

In addition, the additive is characterized in that it contains zinc oxide (ZnO), stearic acid, titanium dioxide, calcium carbonate, and magnesium carbonate.

And, a first step of crushing the lightweight waste plastic to form lightweight waste plastic powder; A second step of mixing the formed lightweight waste plastic powder with a rubber base and vulcanizing it to form a compound; A third step of dispersing the formed compound to form a finely dispersed compound; A fourth step of producing a lightweight foam by mixing the finely dispersed compound with a polyolefin resin, additives, crosslinking agent, and foaming agent.

The lightweight foam composition using waste plastic according to the present invention and the lightweight foam manufacturing method using the same have the following effects.

Lightweight foam made from waste plastic has excellent durability through a pre-dispersion process.

In addition, there is an advantage that properties such as foamability, lightness, tensile strength, and elasticity are improved.

Figure 1 is a flow chart of the present invention's method of manufacturing lightweight foam using waste plastic.

Hereinafter, preferred embodiments of the present invention's lightweight foam composition using waste plastic and the lightweight foam manufacturing method using the same will be described in detail with reference to the attached drawings.

The lightweight foam composition using waste plastic according to the present invention includes lightweight waste plastic powder obtained by pulverizing lightweight waste plastic; Rubber base materials including Acrylonitrile Butadiene Rubber (NBR), Natural Rubber (NR), EPDM, and Stylene Butadiene Rubber (SBR); polyolefin resin; additive; crosslinking agent; and a foaming agent.

First, lightweight waste plastic powder is prepared as a base for the lightweight foam composition using waste plastic according to the present invention. Specifically, the lightweight waste plastic may be ethylene vinyl acetate copolymer (EVA) foam waste plastic, and the lightweight waste plastic powder may be pulverized in a conventional crusher. And, the lightweight waste plastic powder can be pulverized into chips with a size of 1 to 50 mm. If the size of the powder exceeds 50 mm, poor dispersion problems may occur.

In addition, the lightweight foam composition using waste plastic of the present invention includes acrylonitrile butadiene rubber (NBR), natural rubber (NR), EPDM, and styrene butadiene rubber (SBR). A rubber base may be included.

Acrylonitrile butadiene rubber is a copolymer of acrylonitrile and butadiene produced by emulsion polymerization, and is the most widely used oil-resistant rubber. Nitrile content is classified into extreme high nitrile with 42~46%, high nitrile with 36~41%, medium nitrile with 31~35%, and low nitrile with 25~30%. As nitrile content increases, oil resistance, wear resistance, and mechanical properties improve. Properties improve, but cold resistance, extensibility, and elasticity decrease. It is widely used in printing rolls, oil-resistant hoses, and automobile parts.

Natural rubber has a good feel and excellent mechanical properties among all rubbers. It has excellent elasticity, wear resistance, and mechanical properties, but has poor oil resistance, heat resistance, weather resistance, and ozone resistance. It is mainly used in car tires, industrial truck tires, shoes, hoses, belts, air springs, etc.

EPDM is a synthetic rubber made of ethylene, propylene, and non-conjugated diene, and can be vulcanized with sulfur, peroxide, phenol resin, radiation, etc. In particular, diene is intended to enable sulfur vulcanization. EPDM has excellent ozone resistance, weather resistance, heat resistance, and solvent resistance, has a smaller specific gravity than other synthetic rubbers, and is highly economical as it can be highly filled with fillers and oils. It is used for body sealing for automobiles, tire tubes, and hoses. It is used for a wide variety of purposes, including belts, wires, various industrial products, and other polyolefin modifiers.

Styrene butadiene rubber (SBR) is a copolymer made by low-temperature emulsion polymerization of butadiene and styrene. It is the most commonly used general-purpose rubber among synthetic rubbers and has better wear resistance and heat resistance than natural rubber. In addition to these excellent advantages, it has properties that allow for a wide range of uses, such as flat vulcanization, stable scorch properties, and easy processability. Therefore, it is used in most rubber products such as tires, shoes, rubber hoses, and belts.

In one embodiment of the present invention, the lightweight waste plastic powder may be mixed in a ratio of 10 to 60 parts by weight, and the rubber base may be mixed in a ratio of 40 to 90 parts by weight, based on 100 parts by weight of the mixture of the lightweight waste plastic powder and the rubber base. there is. If the mixing ratio of the lightweight waste plastic powder exceeds 60 parts by weight or the mixing ratio of the rubber base is less than 40 parts by weight with respect to 100 parts by weight of the mixture of the lightweight waste plastic powder and the rubber base, the dispersion degree is lowered and the durability of the molded product decreases. If the mixing ratio of lightweight waste plastic powder is less than 10 parts by weight or the mixing ratio of the rubber base is more than 90 parts by weight, the physical properties may decrease and the tensile strength of the molded product may be lowered.

In addition, the lightweight foam composition using waste plastic of the present invention includes polyolefin resin. The polyolefin resins include low density polyethylene (LDPE), linear low density polyethylene (LLDPE), polypropylene, ethylene vinyl acetate copolymer (EVA), and ethylene butene. Among copolymers (ethylene butane copolymer) and ethylene octane copolymer (EOR), they can be used alone or in combination of two or more.

In one embodiment of the present invention, the polyolefin-based resin may be mixed at a ratio of 50 parts by weight based on 100 parts by weight of the mixture of the lightweight waste plastic powder and the rubber base.

Additionally, the lightweight foam composition using waste plastic of the present invention includes additives. Specifically, the additive may include zinc oxide (ZnO), stearic acid, titanium dioxide, calcium carbonate, and magnesium carbonate.

In one embodiment of the present invention, the additive may be mixed at a ratio of 34 to 64 parts by weight based on 100 parts by weight of the mixture of the lightweight waste plastic powder and the rubber base, and specifically, the lightweight waste plastic powder and the rubber base. A ratio of 6 to 10 parts by weight of zinc oxide, 2 to 4 parts by weight of stearic acid, 6 to 10 parts by weight of titanium dioxide, 10 to 20 parts by weight of calcium carbonate, and 10 to 20 parts by weight of magnesium carbonate, based on 100 parts by weight of the mixture. It may be mixed with .

In addition, the lightweight foam composition using waste plastic of the present invention includes a crosslinking agent. Specifically, the cross-linking agent may be dicumylperoxide (DCP).

In one embodiment of the present invention, the cross-linking agent may be mixed at a ratio of 1.6 parts by weight based on 100 parts by weight of the mixture of the lightweight waste plastic powder and the rubber base.

In addition, the lightweight foam composition using waste plastic of the present invention includes a blowing agent. Specifically, the foaming agent may be azodicarbonamide (ADCA).

In one embodiment of the present invention, the foaming agent may be mixed at a ratio of 7 parts by weight based on 100 parts by weight of the mixture of the lightweight waste plastic powder and the rubber base.

Next, we will look at the process of manufacturing lightweight foam using the lightweight foam composition using waste plastic according to the present invention.

Figure 1 is a flowchart of a method for manufacturing lightweight foam using waste plastic according to an embodiment of the present invention.

Referring to Figure 1, the method of manufacturing lightweight foam using waste plastic of the present invention includes a first step (S1) of pulverizing lightweight waste plastic to form lightweight waste plastic powder, and mixing a rubber base with the formed lightweight waste plastic powder. a second step (S2) of forming a compound by vulcanization; a third step (S3) of dispersing the formed compound to form a finely dispersed compound; adding a polyolefin-based resin, additives, crosslinking agent, and foaming agent to the finely dispersed compound. It may include a fourth step (S4) of mixing to produce lightweight foam.

First, in the first step (S1), lightweight waste plastic is pulverized to form lightweight waste plastic powder. Specifically, ethylene vinyl acetate copolymer (EVA) foam waste plastic is pulverized into chips with a size of 1 to 50 mm to form lightweight waste plastic powder.

Next, in the second step (S2), a rubber base is mixed with the formed lightweight waste plastic powder and vulcanized to form a compound. Specifically, based on 100 parts by weight of the mixture of the lightweight waste plastic powder and the rubber base, 10 to 60 parts by weight of the lightweight waste plastic powder and 40 to 90 parts by weight of the rubber base are added to the kneader at a temperature of 90 to 100 ° C. Mix and masticate for 15 to 20 minutes to form a compound.

Here, the rubber base material includes Acrylonitrile Butadiene Rubber (NBR), Natural Rubber (NR), EPDM, and Stylene Butadiene Rubber (SBR).

In addition, if the mixing ratio of the lightweight waste plastic powder exceeds 60 parts by weight or the mixing ratio of the rubber base is less than 40 parts by weight with respect to 100 parts by weight of the mixture of the lightweight waste plastic powder and the rubber base, the dispersion degree is lowered and the molded product Durability may be lowered, and if the mixing ratio of lightweight waste plastic powder is less than 10 parts by weight or the mixing ratio of the rubber base is more than 90 parts by weight, the physical properties may decrease and the tensile strength of the molded product may be lowered.

Next, in the third step (S3), the formed compound is dispersed to form a finely dispersed compound. Specifically, a finely dispersed compound is formed by pre-dispersing 5 to 10 times in a two-roll mill or calendar at a temperature of 80 to 90°C. Here, the finely dispersed compound may be in the form of a sheet or a pellet using a pelletizer.

Compounds that have not gone through pre-dispersion are not evenly dispersed inside and are left in the form of chips, which hinders foaming and reduces the foaming ratio. Also, since it is molded into an empty shape such as a pinhole, durability is reduced.

Then, in the fourth step (S4), a lightweight foam is manufactured by mixing polyolefin resin, additives, crosslinking agent, and foaming agent with the finely dispersed compound. Specifically, lightweight foam is manufactured by mixing 50 parts by weight of polyolefin resin, 34 to 64 parts by weight of additives, 1.6 parts by weight of crosslinker, and 7 parts by weight of foaming agent with respect to 100 parts by weight of the finely dispersed compound.

Here, the polyolefin resin may be an ethylene vinyl acetate copolymer, and the additive may be zinc oxide (ZnO), stearic acid, titanium dioxide, calcium carbonate, and magnesium carbonate. (Magnesium carbonate), based on 100 parts by weight of the finely dispersed compound, 6 to 10 parts by weight of zinc oxide, 2 to 4 parts by weight of stearic acid, 6 to 10 parts by weight of titanium dioxide, 10 to 20 parts by weight of calcium carbonate, and magnesium carbonate. It may be mixed at a ratio of 10 to 20 parts by weight.

Additionally, the crosslinking agent may be dicumylperoxide (DCP), and the foaming agent may be azodicarbonamide (ADCA).

Hereinafter, the lightweight foam composition using waste plastic according to the present invention described above and the lightweight foam manufacturing method using the same will be described in detail with reference to the results of testing its physical properties.

(a) In this experiment, waste plastic and rubber base were mixed to produce a finely dispersed compound.

Materials Comparative Example 1 Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Waste plastic powder
(EVA foam
waste plastic) 100 10 30 50 60 60 60 60 with acrylic
nitrile
butadiene rubber
(KNB40H) - 90 70 50 40 - - - natural rubber
(SVR3L) - - - - - 40 - - EPDM
(KEP330) - - - - - - 40 - styrene
butadiene rubber
(SBR 1502) - - - - - - - 40

[Comparative Example 1]

Comparative Example 1 did not mix the rubber base with the waste plastic powder, put it in a kneader, mixed it at a temperature of 90°C, masticated it for 15 minutes to form a compound, and milled the formed compound in a two-roll mill at a temperature of 90°C. Pre-disperse 10 times to prepare a finely dispersed compound.

[Example 1]

Example 1 is a mixture of 90 parts by weight of acrylonitrile butadiene rubber with 10 parts by weight of waste plastic powder, put into a kneader, mixed at a temperature of 90°C, masticated for 15 minutes to form a compound, and the formed compound. A finely dispersed compound is prepared by pre-dispersing 10 times in a two-roll mill at a temperature of 90°C.

[Example 2]

In Example 2, 70 parts by weight of acrylonitrile butadiene rubber was mixed with 30 parts by weight of waste plastic powder, put into a kneader, mixed at a temperature of 90° C., masticated for 15 minutes to form a compound, and the formed compound. A finely dispersed compound is prepared by linearly dispersing 10 times in a two-roll mill at a temperature of 90°C.

[Example 3]

In Example 3, 50 parts by weight of acrylonitrile butadiene rubber was mixed with 50 parts by weight of waste plastic powder, put into a kneader, mixed at a temperature of 90° C., masticated for 15 minutes to form a compound, and the formed compound. A finely dispersed compound is prepared by linearly dispersing 10 times in a two-roll mill at a temperature of 90°C.

[Example 4]

In Example 4, 40 parts by weight of acrylonitrile butadiene rubber was mixed with 60 parts by weight of waste plastic powder, put into a kneader, mixed at a temperature of 90° C., masticated for 15 minutes to form a compound, and the formed compound. A finely dispersed compound is prepared by linearly dispersing 10 times in a two-roll mill at a temperature of 90°C.

[Example 5]

In Example 5, 40 parts by weight of natural rubber was mixed with 60 parts by weight of waste plastic powder, put into a kneader, mixed at a temperature of 90°C, masticated for 15 minutes to form a compound, and the formed compound was heated to 90°C. A finely dispersed compound is prepared by pre-dispersing 10 times in a two-roll mill at high temperature.

[Example 6]

In Example 6, 40 parts by weight of EPDM were mixed with 60 parts by weight of waste plastic powder, put into a kneader, mixed at a temperature of 90°C, masticated for 15 minutes to form a compound, and the formed compound was kneaded at a temperature of 90°C. Finely dispersed compound is produced by pre-dispersing 10 times in a two-roll mill.

[Example 7]

Example 7 is a mixture of 40 parts by weight of styrene butadiene rubber with 60 parts by weight of waste plastic powder, placed in a kneader, mixed at a temperature of 90°C, masticated for 15 minutes to form a compound, and the formed compound A finely dispersed compound is prepared by pre-dispersing 10 times in a two-roll mill at a temperature of 90°C.

(b) In this experiment, a lightweight foam composition was manufactured using the previously prepared finely dispersed compound.

Materials Comparative Example 2 Example 8 Example 9 Example 10 Example 11 Example 12 Example 13 Example 14 polyolefin resin
(EVA 1328) 150 100 100 100 100 100 100 100 waste plastic powder
(EVA foam
waste plastic) 50 - - - - - - - Compound of Example 1 - 100 - - - - - - Compound of Example 2 - - 100 - - - - - Compound of Example 3 - - - 100 - - - - Compound of Example 4 - - - - 100 - - - Compound of Example 5 - - - - - 100 - - Compound of Example 6 - - - - - - 100 - Compound of Example 7 - - - - - - - 100 zinc oxide 8 8 8 8 8 8 8 8 stearic acid 3 3 3 3 3 3 3 3 discretization
titanium 8 8 8 8 8 8 8 8 calcium carbonate 15 15 15 15 15 15 15 15 Magnesium Carbonate 15 15 15 15 15 15 15 15 crosslinking agent
(Dcumyl
peroxide) 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 blowing agent
(Azodicarbonamide) 7 7 7 7 7 7 7 7

[Comparative Example 2]

Comparative Example 2 contains 150 parts by weight of polyolefin resin, 8 parts by weight of zinc oxide, 3 parts by weight of stearic acid, 8 parts by weight of titanium dioxide, 15 parts by weight of calcium carbonate, 15 parts by weight of magnesium carbonate, and 1.6 parts by weight of crosslinking agent, based on 50 parts by weight of waste plastic powder. Lightweight foam is manufactured by mixing 7 parts by weight of foaming agent and 7 parts by weight of foaming agent.

[Example 8]

Example 8 contains 100 parts by weight of polyolefin resin, 8 parts by weight of zinc oxide, 3 parts by weight of stearic acid, 8 parts by weight of titanium dioxide, 15 parts by weight of calcium carbonate, 15 parts by weight of magnesium carbonate, based on 100 parts by weight of the compound of Example 1. Lightweight foam is manufactured by mixing 1.6 parts by weight of crosslinking agent and 7 parts by weight of foaming agent.

[Example 9]

Example 9 contains 100 parts by weight of polyolefin resin, 8 parts by weight of zinc oxide, 3 parts by weight of stearic acid, 8 parts by weight of titanium dioxide, 15 parts by weight of calcium carbonate, 15 parts by weight of magnesium carbonate, based on 100 parts by weight of the compound of Example 2. Lightweight foam is manufactured by mixing 1.6 parts by weight of crosslinking agent and 7 parts by weight of foaming agent.

[Example 10]

Example 10 contains 100 parts by weight of polyolefin resin, 8 parts by weight of zinc oxide, 3 parts by weight of stearic acid, 8 parts by weight of titanium dioxide, 15 parts by weight of calcium carbonate, 15 parts by weight of magnesium carbonate, based on 100 parts by weight of the compound of Example 3. Lightweight foam is manufactured by mixing 1.6 parts by weight of crosslinking agent and 7 parts by weight of foaming agent.

[Example 11]

Example 11 contains 100 parts by weight of polyolefin resin, 8 parts by weight of zinc oxide, 3 parts by weight of stearic acid, 8 parts by weight of titanium dioxide, 15 parts by weight of calcium carbonate, 15 parts by weight of magnesium carbonate, based on 100 parts by weight of the compound of Example 4. Lightweight foam is manufactured by mixing 1.6 parts by weight of crosslinking agent and 7 parts by weight of foaming agent.

[Example 12]

Example 12 contains 100 parts by weight of polyolefin resin, 8 parts by weight of zinc oxide, 3 parts by weight of stearic acid, 8 parts by weight of titanium dioxide, 15 parts by weight of calcium carbonate, 15 parts by weight of magnesium carbonate, based on 100 parts by weight of the compound of Example 5. Lightweight foam is manufactured by mixing 1.6 parts by weight of crosslinking agent and 7 parts by weight of foaming agent.

[Example 13]

Example 13 contains 100 parts by weight of polyolefin resin, 8 parts by weight of zinc oxide, 3 parts by weight of stearic acid, 8 parts by weight of titanium dioxide, 15 parts by weight of calcium carbonate, 15 parts by weight of magnesium carbonate, based on 100 parts by weight of the compound of Example 6. Lightweight foam is manufactured by mixing 1.6 parts by weight of crosslinking agent and 7 parts by weight of foaming agent.

[Example 14]

Example 14 contains 100 parts by weight of polyolefin resin, 8 parts by weight of zinc oxide, 3 parts by weight of stearic acid, 8 parts by weight of titanium dioxide, 15 parts by weight of calcium carbonate, 15 parts by weight of magnesium carbonate, based on 100 parts by weight of the compound of Example 7. Lightweight foam is manufactured by mixing 1.6 parts by weight of crosslinking agent and 7 parts by weight of foaming agent.

Properties unit Comparative Example 2 Example 8 Example 9 Example 10 Example 11 Example 12 Example 13 Example 14 Expansion ratio
(early/late) % 155/
148 171/
163 170/
162 168/
161 161/
160 155/
160 155/
161 155/
161 Hardness Type C 56 46 47 47 49 50 48 49 Density g/cc 0.224 0.179 0.185 0.190 0.199 0.204 0.201 0.199 tensile strength kg/ ^cm2 15.5 20.75 21.80 22.05 22.51 22.14 21.6 21.5 Elongation % 150 220 210 200 200 220 210 210 tear strength kg/cm 7.5 10.11 10.28 10.28 10.72 11.48 11.05 10.80 Resilience % 41 55 54 53 52 54 52 52 Compression set % 72 60 58 57 56 54 55 57 dispersibility ◎Good
○Normal
ⅩDefect ⅩDefect ◎Good ◎Good ◎Good ○Normal ○Normal ○Normal ○Normal

As shown in Table 3, when compared to Comparative Example 2, it was confirmed that the mechanical properties of the Examples mixed with the rubber base were average or good, especially Examples 8 and 9 containing acrylonitrile butadiene rubber. It was confirmed that Example 10 had excellent mechanical properties.

As such, a person skilled in the art will understand that the technical configuration of the present invention described above can be implemented in other specific forms without changing the technical idea or essential features of the present invention.

Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive, and the scope of the present invention is indicated by the claims described later rather than the detailed description above, and the meaning and scope of the claims and their All changes or modified forms derived from the equivalent concept should be construed as falling within the scope of the present invention.

S1: First step of forming lightweight waste plastic powder
S2: The second step of forming the compound
S3: Third step to form finely dispersed compound
S4: The fourth step in manufacturing lightweight foam

Claims (5)

Lightweight waste plastic powder obtained by pulverizing lightweight waste plastic;
Rubber base materials including Acrylonitrile Butadiene Rubber (NBR), Natural Rubber (NR), EPDM, and Stylene Butadiene Rubber (SBR);
polyolefin resin;
additive;
crosslinking agent; and
A lightweight foam composition using waste plastic, characterized in that it is composed of a mixture of a foaming agent. According to clause 1,
A lightweight foam composition using waste plastic, characterized in that the lightweight waste plastic powder is in the form of chips with a size of 1 to 50 mm. According to clause 1,
A lightweight foam composition using waste plastic, characterized in that it contains 10 to 60 parts by weight of the lightweight waste plastic powder and 40 to 90 parts by weight of the rubber base, based on 100 parts by weight of the mixture of the lightweight waste plastic powder and the rubber base. According to clause 1,
The additive is a lightweight product using waste plastic, characterized in that it contains zinc oxide (ZnO), stearic acid, titanium dioxide, calcium carbonate, and magnesium carbonate. Foam composition. A first step of crushing lightweight waste plastic to form lightweight waste plastic powder;
A second step of mixing the formed lightweight waste plastic powder with a rubber base and vulcanizing it to form a compound;
A third step of dispersing the formed compound to form a finely dispersed compound;
A fourth step of manufacturing a lightweight foam by mixing the finely dispersed compound with a polyolefin resin, additives, crosslinking agent and foaming agent.