CS264828B1 - Agglomerated composite thatch - Google Patents

Abstract

The sheathing material is formed on the surface of the central part of a thickness of 0.25 to 3.0 mm from fibrous material, such as paper, cardboard, woven and non-woven fabrics or combinations thereof, containing binders based on phenol-formaldehyde, polyester resins and/or fibrous material, such as glass fibers, metal fibers or combinations thereof, contained in a binder layer of polyester resin, epoxy resin and/or their mixture with additives and fillers in an amount of 0.2 to 300% by weight per weight of the resin.

Description

264828 2

BACKGROUND OF THE INVENTION The present invention relates to agglomerated composite boards with high instantaneous and long-term elastic modulus, flexural strength and tensile strength.

DoposiaJ. are known agglomerated large-area panels or parts of ligno-cellulosic particles, such as chips, sawdust bonded with urea-formaldehyde adhesives on both sides, usually provided with one layer of decorative paper impregnated with urea melamine resins, or a combination thereof, or various synthetic films for the purpose of decorative surface treatment, enhancement resistance of the surface to water, chemical effects, mechanical damage, or flammability. The disadvantage of these boards or parts is that they can only be used indoors, such as decoiling, furniture, and cladding in building structures because they have a very low modulus of elasticity so that they can only be used where there is no high load or permanent load in which they "flow" in their inner structure, ie, their properties change significantly. Other mechanical properties, in particular the instantaneous modulus of elasticity, flexural strength and tensile strength are low compared to those of a grown wood or blanks. By increasing the density, some increase in these properties as well as the instant modulus of elasticity can be achieved, but this increase is limited. However, by increasing the density of the agglomerated plates, their basic lack of "creep of their mass" is not altered, as evidenced by the long-lasting modulus of elasticity, which only increases insignificantly, so that it is not possible to obtain agglomerated thatch of new properties.

These shortcomings of the current state are removed! composite-agglomerated thatch with high-viscosity and sustained modulus of elasticity, flexural strength and tensile strength, the principle of which is that the mantle material is formed on the surface of the central portion in the form of a carrier layer of 0.25 to 3.0 mm thick, consisting of a fibrous material such as are paper, paperboard, woven nonwovens or combinations thereof with a binder based on phenol-formaldehyde polyester resins and / or fibrous material, such as glass fibers, metal fibers, or combinations thereof present in the binder layer of the polyester resin, epoxy resin and / or or in a mixture thereof with added and fillers in an amount of 0.2 to 300% by weight. on resin weight.

The composite-agglomerated underlays according to the invention have a higher utility value than those of the constructional or that with high instantaneous as well as long-lasting modulus of elasticity and strength, thus also taking on the carrier function in the structures. The higher effect of the invention is to increase the instantaneous modulus of elasticity to two to four times, which is close to the values of the grown wood and longitudinal modulus of elasticity by four to ten times. Agglomerated composites with bonded waterproof adhesives, by their properties, exceed the properties of high quality phenolic foliated plywood especially in the long-term elasticity module. Along with the modulus of elasticity, other strength properties also increase bending strength. The composite-agglomerated thatch according to the invention is homogeneous in all directions in view of its high flexural strength and modulus of elasticity as opposed to plywood and grown wood. However, the cost of production is lower and the production of the central agglomerated part does not require a high quality raw material than the production of plywood. The manufacturing process is simple and can be applied to currently used equipment. Přikladl

Composite chip agglomerated plate 20 mm bonded with phenol-formaldehyde glue containing a hydrophobic agent coated on both sides with a 0.6 mm thick mantle support material in the form of a layer of phenol-formaldehyde resin with a flexural strength of 50.0 MPa and a long-term modulus of 4,000 MPa. Example 2

Composite-extruded agglomerated board made up of two 10 mm thick rock boards bonded with a hydrophobising agent adhesive on one side and provided with a 2.0 m thick shell support material in the form of heterogeneously arranged glass fibers and a metallic fiber with a fiber thickness of 0.5 mm in the binder layer polyester resin with filler

Claims (3)

And 26% by weight of fillers in an amount of 200% by weight. on the weight of the resin, on the other hand, of the inner side thereof with a 2.0 mm thick sheathing material in the form of heterogeneously arranged glass fibers in the binder layer of the polyester resin of the same composition as in the previous layer, the phenolic resin impregnated with a layer of impregnated paper on the outside 0.15 mm. Flexural strength of 100 MPa, instantaneous modulus of elasticity 9,000 MPa, long-term modulus of elasticity 7,000 MPa. EXAMPLE 3 Composite tannin-beaded agglomerated 12 mm melamine-bound agglomerate with urea-formaldehyde glue with a hydrophobic agent, coated on both sides with a coating material of 0.25 mm thickness formed by a glass fabric contained in the epoxy resin binder layer with 0.2% by weight of additives. on the weight of the resin, with a flexural strength of 70 MPa, an instantaneous modulus of elasticity of 8,000 MPa. Example 4 Composite sawdust agglomerated 10 mm thick board bonded with an isocyanate adhesive with a hydrophobic agent on one side provided with a 0.3 mm thick sheathing support layer formed with a polyester resin-containing nonwoven fabric, 0.4 mm thick phenol-formaldehyde-containing cardboard resins, with a flexural strength of 50.0 MPa, an instantaneous modulus of elasticity of 4,000 MPa. The composite agglomerated thatch according to the invention can be used in wood processing, construction, transportation and packaging. SUBJECT OF THE INVENTION A composite agglomerated thatch with a high instantaneous and long-term elastic modulus, a flexural strength formed from a centered flat-molded part formed from chips, sawdust or a combination thereof bonded with synthetic adhesives with increased water and moisture resistance to phenol-formaldehyde isocyanate, or urea melamine non-formaldehyde adhesives in an amount of 3 to 25 wt. glue solids for absolute dry matter of lignocellulosic material, additives such as hydrophobic additives, fungicide or combinations thereof and sheathing material, characterized in that the sheathing material is formed on the surface of the central portion in the form of a carrier layer of 0.25 to 3.0 mm thickness consisting of a fibrous material, such as paper, paperboard, woven and nonwoven fabrics, or combinations thereof, containing a binder based on phenol-formaldehyde, polyester resin or fibrous material, such as glass fibers, metal fibers or combinations thereof found in from 0.2 to 300% by weight of the polyester resin binder, epoxy resin and / or admixture with the added and fillers. on the weight of the resin. 2. Composite agglomerated panels according to claim 1, characterized in that the central part is formed, at least from one layer, with a heterogeneous or one-directional orientation of the particles. 3. Composite agglomerated panels according to claim 1, characterized in that the arrangement of the fibers of the support material is heterogeneous or predominantly oriented in one direction.