Method for obtaining heat-insulating material based on wood filler

FIELD: construction.

SUBSTANCE: method for obtaining a heat-insulating material involves mixing of filler and a binding agent with further shaping and hardening. Industrial wood chips 5±2 mm thick are used as filler, and rigid polyurethane foam consisting of polyol and isocyanate is used as the binding agent. First, components of the binding agent are mixed; then, the binding agent is mixed with the filler by layer-by-layer laying of a binding agent layer, a filler layer and a binding agent layer into a mould at the following component ratio, wt %: polyol 24-22, isocyanate 36-33, industrial chips 40-45. After supply of the components is completed, the mould is fixed with latches and exposed during 15-20 minutes.

EFFECT: reduction of density and thermal conductivity of material.

1 tbl, 1 dwg

 

The invention relates to the construction materials industry and can be used in the manufacture of insulation products or reinforced insulation for the external facades of buildings and structures.

A known method of manufacturing a heat-insulating material, consisting of the preparation of the original composition by mixing its components, foaming composition, its pouring and curing in the form in the following ratio, wt.%:

curing the core - 30-50% liquid sodium
glass silicate module 2,8-4,571-77
the hardener or sodium fluorosilicate preparation (Na2SiF6),
or sodium hexaferrite (Na2TiF6),
or their mixtures in any mixing ratioan 8.5 and 9.1
the foaming agent -
or sodium, or triethanolammonium
salt laurylof 0.9 to 3.2
the filler is asbestos-chrysotile brands
or A5 or A4 or A3 or A22,4-5,5
waterthe rest,

see RU Patent No. 2458025, IPC C04B 38/10 (2006.01), C04B 40/00 (2006.01), 2011.

The disadvantages of this method is to obtain a thermal insulation material with low thermal performance.

Known insulating material and the method thereof, characterized in that as the fibrous filler is used cardboard, pre-soaked and then dehydrated to obtain a fibrous mass. Then mix it with the ingredients in the mixer belt type, in the following ratio, wt.%:

fibrous mass of containerboard10,56-10,71
a binder is a polyvinyl acetate glue0,35-1,72
hardener based on isocyanate0,02-0,09
the foaming agent0,37-0,38
waterthe rest,

see RU Patent No. 2469977, IPC C04B 26/18 (2006.0), C04B 18/24 (2006.01), C04B 24/12, E04B 1/78, 2012.

The disadvantages of this method are the complexity and duration of the technological process, as well as the heat insulating material with low thermal performance.

The closest in technical essence is a method for insulating material including a mixture of components of the polyurethane-polyethylene glycol with filler and subsequent introduction into the mixture components MDI, in which the filler used a fine powder of natural gypsum or dolomite flour, these components are mixed in a ratio, wt.%:

the polyethylene glycol20-30
the polyisocyanate15-20
filler50-65

see RU Patent No. 2169741, IPC7C04G 18/04, C04B 38/10, 2001.

The disadvantage of this method is a heat insulating material with high density and low thermal performance.

The task of the invention to provide a heat-insulating material with low density and thermal conductivity.

The technical problem is solved by providing a method of obtaining teploizolyatsii the aqueous-based material wood filler, comprising a mixture of a filler and a binder, characterized in that the filler used wood wood chips with a thickness of 5±2 mm, as a binder using rigid polyurethane foam, consisting of polyol and isocyanate pre-engaged mixture of binder components, and then mixing a binder with a filler layer by layer stacking layer binder, the layer of the filler and the binder layer in the form, when the ratio of all components of the mixture, wt.%:

polyol24-22
isocyanate36-33
process chips40-45,

after full flow components, the shape is fixed constipation and incubated for 15-20 minutes

Technical solution allows to obtain a heat-insulating material with low density in 6 times and reduced thermal conductivity of 1.5 times.

When implementing the inventive method is used the following components:

as the polyol used "chemtrust KAS-40 m TU-2226-004-27903090-2009;

as the isocyanate used "millionth MR-200", representing polymethylenepolyphenylisocyanate, which contains 4,4-diphenylmethane Socionet, its isomers or more high molecular weight oligomeric homologues 4,4-diphenylmethanediisocyanate;

as using wood filler particles - wood chips according to GOST 15815-83.

In Fig.1 shows the diagram of a method for insulating material based wood filler.

The method is carried out according to the scheme of receipt of material at the facility, which consists of a hopper 1, intended for storage of wood chip production facility, feeder 2, designed for dosed supply of wood particles, the tank 3 for storing the polyol tank 4 for storing isocyanate foam generator 5, intended for mixing water and isocyanate feeder 6, designed for dosed supply of a polyurethane mixture, distributor layers 7, designed for layer-by-layer issuance of a polyurethane mixture and wood particles, feeder 8, designed for dosed supply of a layer of a polyurethane mixture, the feeder 9, designed for dosed supply of a layer of wood particles, the feeder 10, designed for dosed supply of a layer of a polyurethane mixture, form 11, which is intended for forming of plate material.

To bring a full picture of the invention provides examples of sample, etc visionpoint insulating materials. The composition, structure, key indicators of insulating material, namely the coefficient of thermal conductivity and density of the proposed material and the prototype are listed in table 1.

Example 1. A method for insulating material as follows. Take 40 wt.% (60 g) of wood chips the size of 5±2 mm, and fed from the hopper 1 through the feeder 2 to the distributor layer 7. From the tank 3 serves 24 wt.% (14.4 g) polyol in the foam generator 5, there from the container 4 serves 36 wt.% (21,6 g) isocyanate. In the generator 5 has watered and isocyanate are mixed and converted into polyurethane foam through the feeder 6 is served in the dispenser layers 7, where layer-by-layer, provide a polyurethane mixture and wood particles, through the feeder 8 provides a layer of polyurethane foam mixture through the feeder 9 is applied a layer of wood particles, through the feeder 10 serves layer polyurethane mixture in the form of 11, where stand 15-20 minutes

Example 2. The operation is carried out analogously to example 1, when I take to 42.5 wt.% (63.7) technology chip size of 5±2 mm, and fed from the hopper 1 through the feeder 2 to the distributor layer 7. From the tank 3 serves 23 wt.% (13.8 g) of the polyol in the foam generator 5, there from the container 4 serves to 34.5 wt.% (20.7 g) isocyanate. In the generator 5 has watered and isocyanate are mixed and converted into polyurethane foam through the feeder 6 submit to the distributor the Loew 7, where layer-by-layer, provide a polyurethane mixture and wood particles, through the feeder 8 provides a layer of polyurethane foam mixture through the feeder 9 is applied a layer of wood particles, through the feeder 10 serves layer polyurethane mixture in the form of 11, where stand 15-20 minutes

Example 3. The operation is carried out analogously to example 1, when I take 45 wt.% (67,5 g) technology chip size of 5±2 mm, and fed from the hopper 1 through the feeder 2 to the distributor layer 7. From the tank 3 serves 22 wt.% (13,2 g) polyol in the foam generator 5, there from the container 4 serves 33 wt.% (19,8 g) isocyanate. In the generator 5 has watered and isocyanate are mixed and converted into polyurethane foam through the feeder 6 is served in the dispenser layers 7, where layer-by-layer, provide a polyurethane mixture and wood particles, through the feeder 8 provides a layer of polyurethane foam mixture through the feeder 9 is applied a layer of wood particles, through the feeder 10 serves layer polyurethane mixture in the form of 11, where stand 15-20 minutes

The obtained wood-insulating material meets the requirements of GOST 16381-77 "Materials and products building insulation. Classification and General technical requirements: has a thermal conductivity of not more than 0,165 W/(m*°C) and has a density of not more than 500 kg/m3.

Coefficient of thermal conductivity determined by the Yu installation with the brand MG4 "250" according to GOST 7076-99. The method of determination is based on the inpatient flow of air through the sample. After the measurement is completed, the installation reflects on the display the values of the coefficient of thermal conductivity of the sample.

The density of the insulation material are determined according to GOST 17177-94 by the formula

where m is the mass of the dry sample, kg,

V - volume of sample, m3.

# exampleComposition, g/wt.%Density, kg/m3The density of the prototype, kg/m3Coefficient of thermal conductivity, W/(m*°C)thermal conductivity of the prototype, W/(m*°C)
1Components of insulating material964140,0720,12
process chips60/40
polyol14.4V/24
isocyanate 21,6/36
2Components of insulating materialof 98.20,079
process chips63,7/42,5
polyol13,8/23
isocyanate20,7/34,5
3Components of insulating material100,50,084
process chips67,5/45
polyol13,2/22
isocyanate19,8/33

Thus, the claimed method for insulating material based wood filler in comparison with the prototype allows to reduce the density of the material in 4 times, to reduce thermal conductivity of 1.5 times, also reduces the cost of material by filling the wood particles.

A method for insulating material based wood filler comprising a mixture of a filler and a binder, from which causesa fact, in the filler used wood wood chips with a thickness of 5±2 mm, as a binder using rigid polyurethane foam, consisting of polyol and isocyanate pre-exercise the mixture of binder components, then mix the binder with the filler layer by layer stacking layer binder, the layer of the filler and the binder layer in the form, when the ratio of all components of the mixture, wt.%:

polyol24-22
isocyanate36-33
process chips40-45,

after full flow components, the shape is fixed constipation and incubated for 15-20 minutes



 

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2 cl, 4 ex, 2 tbl

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1 dwg, 2 tbl, 12 ex

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1 tbl

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2 tbl

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EFFECT: higher convenience of plaster application onto surface of items.

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