Composition for insulating material and the insulating material on its basis

 

(57) Abstract:

The invention relates to the production of environmentally friendly non-combustible heat-insulating covering material in the form of spherical granules (pellets) of waste wood raw material, specifically from sawdust, remaining at the wood processing enterprises. The composition comprises sawdust, polyvinyl alcohol, sodium carboxymethyl cellulose, 50% aqueous solution of the condensation product of urea and phosphoric acid, sodium fluoride and water. Insulation material made in the form of spherical granules with a diameter of from 5 to 25 mm, a Specific ratio of components of the composition provides the density of the insulation material 150-200 kg/m3high thermal insulation properties, fire resistance and resistance to rotting fungi. 2 S. p. f-crystals, 2 tab.

The invention relates to the production of ecologically clean nonflammable insulating covering material in the form of spherical pellets from waste wood raw material, specifically from sawdust, remaining at the wood processing enterprises.

In modern construction, the trend of widespread use teploizolyatsii is. Soft heat-insulating fiberboard according to GOST 4598-96, fire and biosediment, have high density (250-450 kg/m3) and small thickness (10-18 mm), which creates serious difficulties when using MDF for the insulation of walls, intermediate floors, etc., as the thickness of the structures that require insulation ranges from 150 to 300 mm (Nikolaev N. E., Mirecki C. Y. fire retardant wood boards. KBO. INF. Vol., L-M: NIPIEILESPROM, 1985, S. 48).

Known composition for the production of articles such soft fiberboard, incorporating sawdust fraction less than 5 mm.with. The USSR 537844, CL 27 To 3/04, 1976). Products from this composition, also have density, limiting their use as insulating material (386-426 kg/m3).

Known composition for the manufacture of nonflammable environmentally friendly heat insulation material, manufactured by the wet method of processing waste wood raw material containing, in particular, sawdust (less than 5 mm), diamoni phosphate as a flame retardant and water repellent (RF Patent 2096432, CL 08 L 97/02, 1994).

The disadvantage of this structure is the high density of the products obtained, and therefore reduces their insulating t is for development of woody fungi, that is unacceptable for wooden structures.

Use as flame retardant diamoni phosphate, which gradually decompose and emit into the environment of toxic ammonia, affects the sustainability of the material and reduces its resistance. Those samples that have low Flammability, have a density of from 300 to 500 kg/m3low insulation qualities and small thickness. Thus, the material has the same drawbacks as the above-mentioned technical solutions.

The closest technical solution is a wood filler for the manufacture of arbolita in the form of large and small granules from a mixture of sawdust and machining chips.with. The USSR 1574572, CL 04 In 18/24, 1990).

The pelletization of wood filler is in the pellet. Seal wood waste is performed at a pressure of 25-75 MPa, and heating the mass to 150-180oWith that creates the possibility of samoslivnoy mass.

The disadvantage of wood filler is that the granules become dense and heavy, not having insulating properties.

The technical problem of the invention consists in SN this task is achieved by the composition for insulating material including sawdust, a binder and water, contains as a binder a mixture of polyvinyl alcohol and sodium salt of carboxymethyl cellulose, as a flame retardant to 50% solution of the condensation product of urea and phosphoric acid, and as an antiseptic sodium fluoride in the following ratio, wt.%:

Sawdust - 60-68

Polyvinyl alcohol - 7-8

Sodium carboxymethyl cellulose - 7-8

50% aqueous solution of the condensation product of urea and phosphoric acid - 15-18

Sodium fluoride - 2-2,2

Water - the Rest

and insulation material based on the composition made in the form of spherical granules with a diameter of from 5 to 25 mm

We offer thermal insulation material is manufactured as follows.

The source material in the form of sawdust sieved on a sieve labeled "3" (hole diameter 3 mm).

Formation of granules used disc granulator with the diameter of the plate 450 mm and a height of a side of 150 mm, with a variable angle to the horizontal surface from 35 to 55oand speed from 40 to 60 rpm Sawdust with a particle size of from 0.5 to 3 mm load in darelcbasace with antiseptic agent and a flame retardant with a nominal viscosity of the binder (OT-4) 50-85 with and its consumption per unit mass of sawdust 3-4 kg of solution per 1 kg of sawdust. The obtained spherical granules were subjected to drying at a temperature of from 60 to 110oSince then they harden and acquire all the necessary properties of granulated porous loose-fill insulation material.

The composition for obtaining the proposed insulation material prepared according to the following technology.

The necessary amount of dry sodium salt of carboxymethyl cellulose (CMC) pour measured amount of water. After swelling of CMC at room temperature for 1 day, the solution is brought to a boil with careful stirring. The mixture boil until you get a solution and put in a hot state to the next operation.

The required amount of sodium fluoride is dissolved in a measured amount of water by stirring at a temperature of 60oC. After complete dissolution of sodium fluoride in the same capacity add the required amount of 50% aqueous solution of the condensation product of urea and phosphoric acid (DIAFOS) with thorough stirring. Then added in small portions under stirring to a warm solution of CMC. The resulting solution is the first component of the binder to produce gradually heated, bring to a boil and boil 5 minutes. This solution is the second component of the binder to produce granules.

After the above components are mixed in the appropriate ratio and used in the process of obtaining granules.

The claimed composition 9 illustrate examples.

Composition and dimensions of the finished pellets pellets are given in table.1.

The ratio of solutions 1 and 2 was changed in the range from 1.5/1 to 2/1. The retention time connecting after connecting solutions 1 and 2 is 12 hours. After this period starts fast salustiana binder.

In table. 2 shows data on thermal conductivity and fire resistance of insulating material in the form of spherical granules (pellets).

The proposed solution allows to give to the material density of 150-200 kg/m3and high thermal insulation properties due to the receipt of waste wood in the form of sawdust durable, and lightweight spherical granules, which are used in the form of charging, nonflammable and antiseptirovannogo insulating material for insulation of building structures. thermal conductivity () of the claimed material is from 0.04 to 0.06 kcal/Aceste flame retardant non-volatile condensation products of urea and phosphoric acid;

b) resistance to rotting fungi through the use of non-volatile antiseptic in the form of sodium fluoride.

1. Composition for insulating material including sawdust, a binder and water, characterized in that it contains as a binder a mixture of polyvinyl alcohol and sodium salt of carboxymethyl cellulose, as a flame retardant to 50% aqueous solution of the condensation product of urea and phosphoric acid as an antiseptic, sodium fluoride in the following ratio, wt. %:

Sawdust - 60-68

Polyvinyl alcohol - 7-8

Sodium carboxymethyl cellulose - 7-8

50% aqueous solution of the condensation product of urea and phosphoric acid - 15-18

Sodium fluoride - 2-2,2

Water - the Rest

2. Insulation material made in the form of spherical granules, characterized in that it is made from the composition under item 1 in the form of spherical granules with a diameter of from 5 to 25 mm

 

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