RU1807979C - Raw materials mixture for production of heat-insulating construction material - Google Patents

Abstract

SUMMARY OF THE INVENTION: The raw material mixture contains paper waste 60-80% and polyethylene 20-40%. Polyethylene can be introduced as waste plastic film, and laminated paper can be used as waste paper and polyethylene. The paper waste and the waste of the polyethylene film are mixed after grinding and poured into the mold of a hot press. Pressing is carried out at a temperature of 160 ° C and a pressure of 1.0 MPa, the exposure time in the press is 1 min / mm of plate thickness. The density of the material is 0.70-0.92 g / cm3, compressive strength 38.5-45.8 MPa, bending 7.64-11.14 MPa, tensile 5.94-8.06 MPa, water absorption 5-15%, hygroscopicity 0.1-0.5%, swelling 0-1.0%. 1 tab. ate with

Description

The invention relates to building materials and can be used for the manufacture of heat-insulating and structural materials used as internal partitions, decorative cladding panels, floors, suspended ceilings, etc.

The purpose of the invention is to increase mechanical strength, reduce water absorption, hygroscopicity and swelling.

Waste paper is a waste of recycled paper raw materials (GOST 10700-75) and may contain, in any weight combination, kraft bags, paper containers, cardboard marriage, various

paper scraps, archival files (documents) to be destroyed, etc.

The waste plastic film is used and worn-out plastic film (GOST 10354-82), as well as products unfit for reuse: bags, bags, various packaging containers, etc.

The most preferred raw materials are waste laminated paper in the form of second-hand food containers (bags of dairy products, fish concentrates, juices, etc.). These wastes, which are paper laminated on both sides with a plastic film, are not exposed to natural

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self-decomposing, are not disposed of and serve as one of the essential factors leading to intensive environmental pollution. On the other hand, this raw material, in its primary form, used for temporary storage of food products, when processed into products, gives the latter an exceptional environmental friendliness.

During hot pressing of pre-shredded and uniformly mixed paper waste paper and polyethylene film waste, the latter at a pressure of 0.5-1.0 MPa and. at a temperature of 150-160 ° C, they melt, turn into a viscous state, after which the resulting melt evenly fills the space between the crushed paper. Under conditions of confined space bounded by press plates and side walls of the mold, at the indicated temperatures, partial surface pyrolysis of the paper component of the raw material mixture occurs, which is in direct contact with the hot surfaces of the press. Pyrolysis is accompanied by the release of a gas phase, which helps to increase the internal pressure in the mold, which improves the uniform distribution of the molten polyethylene in the bulk of the filler. The isotropy of the structure of the press mass, due to the random arrangement of the paper filler, and the uniformity of the pore filling with a polyethylene melt, provide the manufactured material with high mechanical strength, shape stability, low water absorption, hygroscopicity and swelling. In addition, as a result of pyrolysis, the particles of paper waste on the surface of the press mass darken to varying degrees, acquiring a hue from light to dark brown, which gives the surface of the material a decorative appearance that resembles the color of a natural cork.

If limited paper is used as waste material, mechanical mixing of the crushed raw material mixture is no longer necessary since it is paper particles coated on both sides with plastic film particles. In this case, the isotropy of the material structure also increases.

A decrease in the waste content of the polyethylene film below 20% (by weight) does not allow to achieve the set goal.

An increase in the content of polyethylene film wastes above 40% (by weight) leads to an increase in the density of the insulating and structural material,

without increasing its mechanical strength.

PRI me R 1. Paper waste paper in an amount of 80% (by weight) and waste polyethylene film in an amount of 20% (by weight) after grinding by a rotary grinder brand IPR-100-1-A is mixed and put into a mold of mountains bringing the press. Pressing is carried out at a temperature of 160 ° C and a pressure of 1.0 MPa, the exposure time in the press is 1 min / mm of plate thickness.

PRI me R 2. Paper waste paper in an amount of 70% (by weight) and waste plastic film in an amount of 30% (by weight) after grinding with a rotary grinder brand IPR-100-1-A is mixed and filled into the press form of a hot press . Pressing is carried out at a temperature of 160 ° C and a pressure of 1.0 MPa. The exposure time in the press is 1 min / mm of plate thickness.

PRI me R 3. Paper waste paper in an amount of 60% (by weight) and waste polyethylene film in an amount of 40% (by weight) after grinding with a rotary grinder brand IPR-100-1-A is mixed and put into a mold of mountains bringing the press. Pressing is carried out at a temperature of 160 ° C and a pressure of 1.0 MPa. The exposure time in the press is 1 min / mm of plate thickness.

The table shows the properties of the examples and prototype.

Claims (1)

The claims 1, a Raw mixture for the manufacture of thermal insulation material, including organic filler and polyethylene, characterized in that, in order to increase mechanical strength, reduce water absorption, hygroscopicity and swelling, it contains paper waste as a filler in the following ratio of components, May . %: Waste paper 60-80 Polyethylene 20-40 2, The raw material mixture according to claim 1, with a t and h a tout so that it contains polyethylene in the form of waste plastic film. 3. The raw material mixture according to claim 1, with a rout a so that, in order to simplify the preparation process, it contains laminated paper.