KR-20260063182-A - CEMENT MORTAR COMPOSITION CONTAINING POLYPROPYLENE POWDER

Abstract

The present invention relates to a cement mortar composition containing polypropylene powder, utilizing polypropylene waste as a raw material for cement mortar, and specifically resolving the disadvantages of the fibrous form and the reduction in strength caused by hydrophobicity. The cement mortar composition containing polypropylene powder according to the present invention comprises, for every 100 parts by weight of cement, 190 to 210 parts by weight of sand, 10 to 30 parts by weight of polypropylene powder with a particle size of 50 μm to 300 μm, 10 to 15 parts by weight of silica fume as a strength reinforcing agent, and 0.4 to 0.6 parts by weight of a water-reducing agent. The polypropylene powder may be processed into a porous structure and then filled with nano silica, and may include a coating layer of carbon nanotubes.

Inventors

• 이희영
• 문정욱
• 김진웅

Assignees

• 조선대학교산학협력단

Dates

Publication Date

20260507

Application Date

20241030

Claims (6)

1. A cement mortar composition containing polypropylene powder, characterized by comprising 10 to 30 parts by weight of polypropylene powder with a particle size of 50 μm to 300 μm per 100 parts by weight of cement.
2. A cement mortar composition containing polypropylene powder according to claim 1, characterized in that the polypropylene powder is processed to be porous.
3. A cement mortar composition containing polypropylene powder according to claim 2, wherein the polypropylene powder is characterized by having nano silica filled in the pores.
4. A cement mortar composition containing polypropylene powder, characterized in that, in any one of claims 1 to 3, the polypropylene powder comprises a coating layer of carbon nanotubes.
5. A cement mortar composition containing polypropylene powder, characterized in that, in any one of claims 1 to 3, it further comprises 190 to 210 parts by weight of sand, 10 to 15 parts by weight of silica fume as a strength reinforcing agent, and 0.4 to 0.6 parts by weight of a water-reducing agent, based on 100 parts by weight of cement.
6. A cement mortar composition containing polypropylene powder according to claim 5, characterized in that 5 to 15 parts by weight of glass powder are mixed with 100 parts by weight of cement.

Description

Cement Mortar Composition Containing Polypropylene Powder The present invention relates to a cement mortar composition, and more specifically, to a cement mortar composition containing polypropylene powder that secures properties such as strength (compression, tension) using waste materials without interfering with the hydration reaction of cement. More than 400 million tons of plastic waste are generated worldwide every year, and only about 9% of it is recycled, and large amounts of plastic waste cause serious environmental problems. To address these issues, various recycling and reuse technologies are being developed, and as one such field, research on utilizing plastics as construction materials is actively underway. Cement composites incorporating plastic waste can create new value for plastics while simultaneously contributing to environmental protection. There are various types of plastics, including polypropylene (PP), terephthalate (PET), high-density polyethylene (HDPE), low-density polyethylene (LDPE), polyvinyl chloride (PVC), polyethylene (PE), and polystyrene (PS). In particular, polypropylene is a highly suitable material for construction due to its excellent heat resistance, ability to maintain a stable shape even in high-temperature environments, and superior tensile strength characteristics; it is already widely used for various purposes, such as kitchenware and automotive parts. Furthermore, polypropylene ranks second in global plastic production and accounts for approximately 20% of the global plastic market. In other words, using polypropylene as a construction material to process large quantities of plastic will greatly contribute to reducing environmental pollution caused by plastic and ensuring the supply of cement raw materials. Specifically, polypropylene can improve the functionality of cement composites through the following characteristics. Polypropylene exhibits excellent resistance to chemicals such as acids and bases. Furthermore, due to its high ductility, it is resistant to fatigue and offers high impact resistance; it can also enhance the durability of cement composites by controlling cracks that occur during drying and shrinkage. Based on these advantages, polypropylene contributes to reducing maintenance costs by extending the lifespan of cement composites. Registered Patent No. 10-2535694, which is a patent document that confirms the background of the present invention, is a polymer mortar composition for concrete repair and reinforcement comprising: 35 to 45 parts by weight of a cement binder comprising at least one of Portland cement, alumina cement, and blast furnace slag powder; 0.1 to 10 parts by weight of a polymer resin; 30 to 50 parts by weight of silicon oxide; 1 to 10 parts by weight of silica fume; 0.1 to 10 parts by weight of a fiber reinforcing agent comprising at least one of polypropylene fiber and sepiolite fiber; 1 to 5 parts by weight of an AE water reducer comprising at least one of cellulose and sodium gluconate; and 1 to 10 parts by weight of a heat-resistant reinforcing agent comprising polybenzoxazine; and using polypropylene fiber has the following problems. Polypropylene is hydrophobic, and when used as a fiber, its large surface area hinders the hydration reaction between cement pastes and forms a wide interfacial transition zone. Consequently, separate treatment is required to ensure uniformity during mixing, meaning that cement with uniform physical properties cannot be obtained. In the following description of the present invention, specific descriptions of related known functions or configurations will be omitted if it is determined that such descriptions would unnecessarily obscure the essence of the invention. Furthermore, the terms described below are defined in consideration of their functions within the present invention, and these definitions may vary depending on the intentions or practices of the user or operator. Therefore, such definitions should be based on the content throughout this specification. As shown in FIG. 1, the cement mortar composition containing polypropylene powder according to the present invention comprises polypropylene, and the specific properties are as follows. The present invention is characterized by using polypropylene as a powder as a first feature, and the polypropylene powder has a particle size of 50μm to 300μm, and the reason is as follows. The smaller the particle size of the polypropylene powder, the more uniformly the material is dispersed within the cement matrix. Small particle sizes prevent material segregation, forming a dense internal structure. Furthermore, small particles promote bonding and interaction between materials, thereby improving strength and enabling the expression of higher strength. However, if large plastic particles are incorporated into a cement composite, they interfere with the interaction between the cement pastes during the hydration process. Conversely, polypropylene powd