SK9400Y1 - Method for preparation of cement-plastic mixture - Google Patents

Abstract

In the first step, crushed plastic material, cement, water and eventually also siliceous sand are mixed in a mixing device at the temperature 8 °C to 25 °C during 3 minutes. In the second step, at least one of the following components is added: superplastificator, solidification accelerant, synthetic fibre, pigment and eventually micro-silicate during 9 minutes.

Description

SK 9400 Υ1

The field of technology

The technical solution concerns the method of preparing a cement-plastic mixture usable for the production of construction and stone products. The technical solution falls into the field of construction and stonework.

Current state of the art

Currently, in the field of construction and stonework, products based on cement, silica sand and crushed stone, granite or marble are commonly known, such as Terazzo.

In the state of the art, the document RU 2739910 Cl is known, in which a polymer-cement dry construction mixture is described, which contains Portland cement, a polymer binder, sand, glass fiber and a modifier. The polymer binder is redispersible polymer powder from polyvinyl acetate or polyvinyl acetate copolymers.

Also from the document CN 112063160 A, a two-component fast-hardening plastic cement is known, where the first component is a polyether polyol, a curing agent, a surface hydroxylated modified paraffin, a thickener and a solid filler. The second component is polyether polyol, catalyst, cross-linking agent, paraffin modified with a surface hydroxyl group, thickener and solid substance. Paraffin with a certain hydroxyl content is introduced into these two components.

There were also tendencies to mix acrylate rubber asphalt into the cement, as is the case with the utility model SK 1692 U, for the purpose of reducing the volumetric weight, increasing the thermal insulation properties and ensuring waterproofness.

A construction mixture containing cement and paper pulp is also known, as described in utility model SK 4239 U, which achieves savings in production costs and a reduction in the weight of the product.

All the described building mixtures, even those based on cement, have their own specific methods of preparation.

The issue of cement mixtures, which has not yet been fully researched, evoked the idea of a composition of the cement mixture and a method of its preparation, which would enable the ecological use and consumption of plastic waste. The result of this effort is the method of preparing the cement-plastic mixture described in this technical solution.

The essence of the technical solution

The mentioned problem of cement mixtures is solved by the proposed cement-plastic mixture, which is prepared in a specific way according to the technical solution. For the purposes of this technical solution, the term cement-plastic mixture should be understood as a mixture of the following composition. It is a mixture that contains crushed plastics, preferably those that cannot be further recycled. It is possible to use plastics of all kinds with a fraction of 1 mm to 20 mm, or even a higher fraction, or chopped plastic strips, except for plastic pellets. Furthermore, it is cement, e.g. portland gray or white with a strength of 32.5 Mpa to 52.5 Mpa. Finally, it is a superplasticizer, e.g. with a density of 20/40 based on melamine-formaldehyde resin and water. Furthermore, the mixture contains silica sand with a fraction of 0.3 mm to 2.0 mm; solidification accelerator, e.g. Betodur A5; synthetic fibers, e.g. ARC 42/30 mm, powder paint and possibly SiOz microsilicate. These components of the basic mixture are in the following percentage representation of individual components:

% wt. up to 43% wt. of plastic waste, % wt. up to 69% wt. cement and

1.0% wt. up to 2.0% wt. superplasticizer.

While 100% wt. at least one supplementary additive component containing: is added to the basic cement-plastic mixture

6.0% wt. up to 12% wt. silica sand,

0.4% wt. up to 0.9% wt. solidification accelerator,

0.04% wt. up to 0.07% wt. ARC synthetic fibers,

0.02% wt. up to 0.08% wt. dyes,

4.0% wt. up to 14.0% wt. water and

4.0% wt. up to 15.0% wt. microsilicate SiOj.

The essence of the method of preparing a cement-plastic mixture according to the technical solution is that: - in the first step, plastic crumb, cement, water and possibly silica sand are mixed in a mixing device at a temperature of 8 °C to 25 °C for 3 min. up to 4 min. a

- in the second step, at least one of the components is added: superplasticizer, solidification accelerator, synthetic fibers, dye and possibly microsilicate SiOz for 6 min. up to 10 min.

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

SK 9400 Υ1

The advantages of the method of preparing the cement-plastic mixture according to the technical solution are obvious from its effects, which are manifested externally. The effects and originality lie in the fact that the unique composition of the mixture is mixed in a specific way with a precisely determined order of adding the components of the mixture and mixing time intervals.

According to the technical solution, garden furniture can be produced from this cement-plastic mixture, e.g. benches, flower pots, trash cans, tables, large-format tiles, facade elements and cast prefabs that can be cut, sanded, sandblasted, impregnated, etc., processed with chip or non-chip technologies.

Implementation examples

Individual embodiments of the method of preparing the cement-plastic mixture according to the technical solution are presented for illustration and not as limitations of the technical solutions. Those skilled in the art will find or be able to find, using no more than routine experimentation, many equivalents to specific embodiments of the method for preparing a cement-plastic mixture according to the technical solution. Even such equivalents will fall within the scope of protection claims.

An expert familiar with the state of the art cannot make it a problem to optimally mix the individual components of the cement-plastic mixture with the appropriate mixing times, therefore these features were not dealt with in detail.

Example

In this example of a concrete embodiment of the subject of the technical solution, the method of preparing the cement-plastic mixture according to the technical solution is described. A basic cement-plastic mixture of the following composition is prepared:

% wt. up to 43% wt. of plastic waste, % wt. up to 69% wt. cement and

1.0% wt. up to 2.0% wt. superplasticizer based on melamine formaldehyde resin.

Where 100% wt. supplementary additives are added to the basic cement-plastic mixture containing:

4.0% wt. up to 14.0% wt. water,

6.0% wt. up to 12% wt. silica sand,

0.4% wt. up to 0.9% wt. solidification accelerator,

0.04% wt. up to 0.07% wt. ARC synthetic fibers,

0.02% wt. up to 0.08% wt. dyes and

4.0% wt. up to 15% wt. microsilicate S1O2.

The cement-plastic mixture of this composition is prepared by:

- in the first step, plastic crumb, cement, water and possibly silica sand are mixed in the mixing device at a temperature of 8 °C to 25 °C for 3 min. a

- in the second step, at least one of the components is added: superplasticizer based on melamine-formaldehyde resin, solidification accelerator, synthetic fibers, dye, and possibly SiO ₂ microsilicate for 9 min.

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

Industrial applicability

The method of preparing the cement-plastic mixture according to this technical solution is intended for the field of construction and stonework.

Claims (3)

SK 9400 Υ1 CLAIMS FOR PROTECTION 1. A method of preparing a cement-plastic mixture, characterized by the fact that in the basic cement-plastic mixture being prepared, the composition: 29 wt.% up to 43% wt. plastic waste; 56% wt. 5 to 69% wt. cement; 1.0% wt. up to 2.0% wt. superplasticizer, where 100 wt.% to the basic cement-plastic mixture, at least one supplementary additive is added with the content: 4.0 wt.% up to 14.0% wt. water; 6.0% wt. up to 12% wt. silica sand; 0.4% wt. up to 0.9% wt. solidification accelerator; 0.04% wt. up to 0.07% wt. synthetic fibers ARC; 0.02% wt. up to 0.08% wt. dyes; 4.0% wt. up to 15% wt. microsilicate SiO ₂ , in the first step, plastic crumb, cement and water are mixed in the mixing device 10 at a temperature of 8 °C to 25 °C for 3 min. up to 4 min. and in an expensive step, at least one of the components is added: superplasticizer, solidification accelerator, ARC synthetic fibers and colorant, mixing everything for 6 min. up to 10 min. 2. The method of preparing a cement-plastic mixture according to claim 1, characterized in that in the first step silica sand 15 with a fraction of 0.3 to 2.0 mm is mixed with the basic cement-plastic mixture in a mixing device. 3. The method of preparing a cement-plastic mixture according to claim 1, characterized in that in the second step microsilicate SiO ₂ is mixed with the basic cement-plastic mixture in a mixing device. End of document