Method for preparing cement-plastic mixtures

Abstract

To provide a method of preparing a cement mixture which allows the ecological use of plastic waste.SOLUTION: A method of preparing a cement plastic mixture is based on the fact that in the first step, plastic crumb, cement, water and optionally silica sand are mixed in a mixing device at a temperature 8°C to 25°C for 3 minutes and in the second step, at least one of the following components is added for 9 minutes: superplasticizer, solidification accelerator, synthetic fiber, paint and optionally silica fume (microsilica) SiO2.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a method for preparing a cement plastic mixture that can be used for the manufacture of buildings and stone products. The present invention falls within the fields of construction and stonework.

Background Art

[0002] Currently, products based on cement, silica sand and stone, granite or marble chips, such as terrazzo, are generally known in the fields of construction and stonework. Terrazzo is a composite material that is poured or precast in place and is used for floor and wall treatments. It contains chips of marble, quartz, granite, glass, or other suitable materials poured together with a cementitious binder (for chemical bonding), a polymer binder (for physical bonding), or a combination of both.

[0003] Patent Document 1 (Russian Patent No. 2739910 C1) is known in the prior art, and this patent describes a polymer-cement dry construction mixture containing Portland cement, a polymer binder, sand, glass fibers and a modifier. This polymer binder is a redispersible polyvinyl acetate polymer powder or a polyvinyl acetate copolymer.

[0004] Two-component fast-curing plastic cement is also known from Patent Document 2 (Chinese Patent No. 112063160 A). In this patent, the first component is polyether polyol, a curing agent, surface-hydroxylated modified paraffin, a thickening agent and a solid filler. The second component is polyether polyol, a catalyst, a crosslinking agent, paraffin modified by surface hydroxyl groups, a thickening agent and a solid. Paraffin with a certain hydroxyl content is introduced into these two components.

[0005] In order to reduce bulk density, increase heat insulation and ensure water impermeability, there has also been a tendency to mix acrylate rubber asphalt into cement, as in the case of Patent Document 3 (Slovak Utility Model No. 1692 U).

[0006] A building mix containing cement and paper pulp is also known, as described in Patent Document 4 (Slovak Utility Model No. 4239U), which reduces production costs and product weight.

[0007] Furthermore, all of the above-mentioned cement-based building mixtures have their own specific preparation methods. [Overview of the project] [Problems that the invention aims to solve]

[0008] The challenges of cement mixtures, which have not yet been fully explored, now call for the design of such compositions and methods for preparing them, which would also enable the ecological use and consumption of plastic waste. The result of this effort is the method for preparing cement-plastic mixtures described in the present invention. [Means for solving the problem]

[0009] The aforementioned problems of cement mixtures are solved by the proposed cement-plastic mixture, which can be prepared by a specific method according to the present invention. For the purposes of the present invention, the term “cement-plastic mixture” may be understood to mean a composition having the following composition: It may be a mixture that preferably further contains crushed plastic that cannot be recycled. Preferably, all kinds of plastics, except for plastic pellets, can be used, with the exception of plastic strips, which are fragments of 1 mm to 20 mm, or even larger fragments. It may also be cement, for example, Portland gray or white with a strength of 32.5 MPa to 52.5 MPa.

[0010] Portland gray and Portland white are historical names for cement that can be used synonymously with hydraulic binders.

[0011] Finally, a fluidizer, such as Melment, a fluidizer based on melamine formaldehyde resin with a density of 20 / 40, and water may be used. According to the present invention, the fluidizer may be based on melamine formaldehyde, or may contain it, or may be manufactured therefrom, and / or may meet the EN 934-2 2019+A1:2012 standard. The mixture further contains silica sand fragments of 0.3 mm to 2.0 mm and / or a solidification accelerator, such as Betodur A5, thus chloride-free concrete and / or synthetic fibers, such as ARC 42 / 30 mm, i.e., alkali-resistant (AR) glass fibers, which may be specifically designed for use in concrete and / or powder coatings and / or silica fume (microsilica) SiO2. These components of the mixture are in the following percentages of the individual components. 29% to 43% by weight of plastic waste, 56% to 69% by weight cement, 1.0% to 2.0% by weight of fluidizing agent These components can exist together, and when combined they make up 100%, they represent the basic mixture. [Modes for carrying out the invention]

[0012] 6.0% to 12% by weight of silica sand, and / or A solidification accelerator in an amount of 0.4% to 0.9% by weight, and / or 0.04% to 0.07% by weight of ARC synthetic fibers, and / or 0.02% to 0.08% by weight of paint, and / or 4.0% to 14.0% by weight of water, and / or 4.0% to 15.0% by weight silica fume (microsilica) SiO2 At least one additional additive component, including or consisting of, is added to the basic mixture.

[0013] The weight percentage of the additional component according to this embodiment means a percentage of the addition to the weight of the base mixture such that the final product has a total mass Y*1.06 of the base mixture by Y units of weight (e.g., kilograms) + an additional weight of, for example, 6% of the additional component.

[0014] Therefore, the weight percentage of the additional components is added to the mass of the base mixture, and the calculation is performed as if the base mixture without the additional components were 100%, resulting in a total final product (cement-plastic mixture) mass of 106% relative to the mass of the base mixture in the example above.

[0015] The essence of the method for preparing cement-plastic mixtures according to the present invention is, In the first step, plastic waste, cement, water, and optionally silica sand are mixed in a mixing device at a temperature of preferably 8°C to 25°C for preferably 3 to 4 minutes. In the second step, a fluidizing agent and / or a solidification accelerator and / or synthetic fibers and / or paint and / or optionally at least one microsilicate SiO2 is added as a component, and preferably mixed for 6 to 10 minutes. The fact lies in this.

[0016] The result of the mixing is a high-strength cement-plastic mixture with self-leveling density.

[0017] The advantages of the method for preparing cement-plastic mixtures according to the present invention are evident from its external effects. The effect and novelty lie in the fact that the unique composition of the mixture is mixed in a unique way, with a precisely defined order of addition of the mixture components and / or mixing time intervals.

[0018] From this cement-plastic mixture according to the invention, it is possible to manufacture cast prefabricated parts that can be cut, sanded, sandblasted, impregnated, and machined in the same way with chipping or non-chipping techniques, such as garden furniture, for example benches, flower pots, trash cans, tables, large-scale paving, facade elements.

[0019] Individual embodiments of the method for preparing the cement-plastic mixture according to the invention are presented for purposes of illustration of the solution and not as limitations of the solution. Those skilled in the art will find or be able to identify many equivalents of the specific embodiments of the method for preparing the cement-plastic mixture according to the invention using only routine experimentation. Such equivalents will also fall within the scope of these claims.

[0020] Optimal mixing of the individual components of the cement-plastic mixture is not a problem for those skilled in the art, and therefore these features are not dealt with in detail.

Example

[0021] In this example of a specific embodiment of the invention, a method for preparing the cement-plastic mixture according to the invention is described. The following composition 29 wt% - 43 wt% plastic scraps, 56 wt% - 69 wt% cement, 1.0 wt% - 2.0 wt% fluidizing agent of the cement-plastic mixture is prepared.

[0022] Furthermore, based on the weight of the basic mixture, 4.0 wt% - 14.0 wt% water, and / or 6.0 wt% - 12 wt% silica sand, and / or 0.4 wt% - 0.9 wt% solidification accelerator, and / or 0.04 wt% - 0.07 wt% ARC synthetic fiber, and / or 0.02 wt% - 0.08 wt% paint, and / or 4.0% to 15% by weight silica fume (microsilica) SiO2 At least one additional component containing or consisting of the above may be added.

[0023] This cement-plastic mixture of composition In the first step, plastic waste, cement, water, and optionally silica sand are mixed in a mixing device at a temperature of preferably 8°C to 25°C for preferably 3 minutes. In the second step, at least one of a fluidizing agent and / or a solidification accelerator and / or synthetic fiber and / or paint and / or silica fume (microsilica) SiO2 is added as a component, and is preferably mixed for 9 minutes. It is prepared by [method].

[0024] The result of the mixing is a high-strength cement-plastic mixture with self-leveling density. [Industrial applicability]

[0025] The method for preparing cement-plastic mixtures according to the present invention is intended for use in the fields of construction and masonry. [Prior art documents] [Patent Documents]

[0026] [Patent Document 1] Russian Patent No. 2739910 C1 Specification [Patent Document 2] Chinese Patent No. 112063160, Specification A [Patent Document 3] Slovak Utility Model No. 1692 U Specification [Patent Document 4] Slovak Utility Model Specification No. 4239U

Claims

1. A method for preparing a cement-plastic mixture, wherein the cement-plastic mixture comprises the following percentage ranges of plastic waste, cement, and a fluidizer, such that the total amount of the basic mixture is 100% by weight: In the first step, 29% to 43% by weight of plastic waste, Portland cement in an amount of 56% to 69% by weight, 4.0% to 14.0% by weight of water, However, it is mixed in a mixing device at a temperature of 8°C to 25°C for 3 to 4 minutes. In the second step, A fluidizing agent based on melamine formaldehyde resin, in an amount of 1.0% to 2.0% by weight, At least one additional component, The additional component is added, A solidification accelerator in an amount of 0.4% to 0.9% by weight, 0.04% to 0.07% by weight of alkali-resistant glass fiber, Paint in a quantity of 0.02% to 0.08% by weight, All components, including, are mixed for 6 to 10 minutes. A method for a cement-plastic mixture, characterized in that the water and the additional components are provided in the aforementioned percentages in addition to the weight of the basic mixture.

2. The method for preparing a cement-plastic mixture according to claim 1, characterized in that, in the first step, 6.0% to 12% by weight of silica sand, which is an additional component in the form of fragments of 0.3 to 2.0 mm, is further mixed in the mixing device.

3. In the second step described above, 4.0% to 15% by weight of silica fume (microsilica) SiO2 is added as an additional component. ２ A method for preparing a cement plastic mixture according to claim 1, characterized in that the following is further added.