SK852021U1 - 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 85-2021 U1

Technical field

The technical solution relates to a 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 stonemasonry.

Prior art

At present, products based on cement, silica sand and crushed stone, granite or marble are commonly known in the field of construction and stonework, such as e.g. Now.

RU 2739910 C1 is known in the prior art, which describes a polymer-cement dry construction mixture which contains Portland cement, a polymeric binder, sand, glass fiber and a modifier. The polymeric binder is a redispersible polyvinyl acetate polymer powder or polyvinyl acetate copolymers.

Also known from CN 112063160 A is a two-component fast-setting plastic cement, 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 a polyether polyol, a catalyst, a crosslinking agent, a hydroxyl surface modified paraffin, a thickener and a solid. Paraffin with a certain hydroxyl content is introduced into these two components.

There was also a tendency to mix acrylate rubber asphalt into the cement, as in the utility model SK 1692 U, in order to reduce the bulk density, increase the thermal insulation properties and ensure water impermeability.

It is also known to build a building composition comprising cement and paper pulp as described in utility model SK 4239 U, whereby savings in production costs and weight reduction of the product are achieved.

All of the above-described building mixtures, also on the basis of cement, have their own specific preparation methods.

The problem of cement mixtures, which has not yet been fully explored, has now evoked the design of such a composition of the cement mixture and the method of its preparation, which would allow the ecological use and consumption of plastic waste. The result of this effort is the method for preparing the cement-plastic mixture described in this technical solution.

The essence of the technical solution

The above-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" is to be understood as meaning a mixture of the following composition. It is a mixture that contains crushed plastics, preferably that cannot be further recycled. It is possible to use plastics of all kinds with a fraction of 1 mm to 20 mm, possibly also a higher fraction, or chopped plastic strips, except for plastic pellets. It is also 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. The mixture further comprises 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, powdered powder and possibly microsilicate S1O2. These components of the masterbatch are in the following percentages of the individual components:

% wt. up to 43% by weight of plastic crumb% wt. up to 69 wt. cement

1.0 wt. up to 2.0 wt. superplasticizer.

At 100% by weight. At least one additional additive component is added to the basic cement-plastic mixture containing:

6.0 wt. up to 12 wt. silica sand

0.4 wt. up to 0.9 wt. solidification accelerator

0.04% by weight up to 0.07 wt. synthetic ARC fibers

0.02% by weight up to 0.08 wt. dyes

4.0 wt. up to 14.0 wt. water

4.0 wt. up to 15.0 wt. of SiOi microsilicateThe essence of the method of preparation of cement-plastic mixture according to the technical solution lies in the fact that: . up to 4 min.

- in the second step, at least one of the following components is added: superplasticizer, setting accelerator, synthetic fibers, colorant and optionally also microsilicate S1O2 for 6 minutes. up to 10 min.

The mixing results in a high-strength cement-plastic mixture with a self-leveling density.

SK 85-2021 U1

The advantages of the method for the preparation of a cement-plastic mixture according to the technical solution are evident 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 at a precisely determined order of addition of the components of the mixture and the mixing intervals.

From this cement-plastic mixture according to the technical solution it is possible to produce garden furniture e.g. benches, flower pots, rubbish baskets, tables, large-format paving, masonry elements and hate prefabricated parts that can be cut, sanded, sandblasted, impregnated, etc. machined with chip or non-chip technologies.

Examples of embodiments

It is understood that the individual embodiments of the method for preparing a 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 ascertain using no more than routine experimentation, many equivalents to specific embodiments of the method for preparing a cementitious plastic composition according to the invention. Such equivalents will also fall within the scope of the protection claims.

For those skilled in the art, the problem of optimal mixing of the individual components of the cement-plastic mixture with the respective mixing times cannot be a problem, therefore these features have not been solved in detail.

Example

In this example of a specific embodiment of the subject of the technical solution, a method of preparing a 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% by weight of plastic crumb% wt. up to 69 wt. cement

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

Where at 100 wt. additional additive components 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% by weight up to 0.07 wt. synthetic ARC fibers

0.02% by weight up to 0.08 wt. dyes

4.0 wt. up to 15 wt. microsilicate S1O2.

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

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

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

The mixing results in a high-strength cement-plastic mixture with a self-leveling density.

Industrial applicability

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

Claims (3)

SK 85-2021 U1 CLAIMS FOR PROTECTION A process for the preparation of a cement-plastic mixture, characterized in that in the base cement-plastic mixture to be prepared, the composition is: 29% by weight. up to 43% by weight plastic crumb; 56% by weight 5 to 69 wt. cement; 1.0 wt. up to 2.0 wt. superplasticizer, where at 100 wt. At least one additional additive component is added to the basic cement-plastic mixture with a content of: 4.0% by weight. up to 14.0 wt. water; 6.0 wt. up to 12 wt. silica sand; 0.4 wt. up to 0.9 wt. solidification accelerators; 0.04% by weight up to 0.07 wt. ARC synthetic fibers; 0.02% by weight up to 0.08 wt. dyes; 4.0 wt. up to 15 wt. of SiO ₂ microsilicate: in the first step in the mixing device 10, the plastic pulp, cement and water are mixed at a temperature of 8 ° C to 25 ° C for 3 min. up to 4 min; in the second step, at least one of the components is added: superplasticizer, setting accelerator, synthetic ARC fibers and dye, all mixed for 6 minutes. up to 10 min. Process for preparing a cement-plastic mixture according to Claim 1, characterized in that in a 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. Process for the preparation of a cement-plastic mixture according to Claim 1, characterized in that in a second step, a SiO ₂ microsilicate is mixed with the basic cement-plastic mixture in a mixing device. End of document