SU859158A1 - Method of modifying wood materials - Google Patents

Description

one .

 The invention relates to the woodworking industry, in particular to the modification of wood materials with synthetic resins.

There is a method of modifying wood, including the impregnation of wood material with phenol alcohols, drying and curing l.

Closest to the present invention is a method for modifying wood, including impregnating wood material with phenol alcohols, drying and curing 2.

A disadvantage of such methods is the distortion and cracking of the wood material, when modified.

The purpose of the invention is to reduce warping and cracking of wood material during modification.

This goal is achieved by the fact that wood material is impregnated with phenol-alcohol, drying and hole-cutting are carried out with mechanical pressure on wood material of 0.050, 1 MPa, and drying is carried out first at 38-45 ° C to a humidity of 8-12%, ai then with increasing temperature up to 100-120 With a speed of 10-20 per hour.

Wood material, such as plywood sheets, is used to carry out the process.

Before impregnation, they are placed in a straightening self-pressing device and create a mechanical pressure on the sample of 0.05-0.1 MPa, then, for example, in an autoclave, impregnation with phenol alcohols, further drying and curing while the material is in the strapping device. After curing, the material is cooled to 40-45 ° C and released 10 from the device.

Example, Construction details of birch plywood 1500x1500x6 mm in size are laid in the tie-down device, their section is metallic

15 gaskets, and compressing the clamping springs, providing. mechanical pressure on the sheets of 0.050, 1 MPa and place the details vertically (to obtain a clean surface)

20 in a fixed device in an autoclave. Then the autoclave is filled with phenol alcohols with a concentration of 50 + 2% and the plywood is soaked for 25 minutes at 0.8 MPa. After the impregnation, the phenol alcohols are removed from

25 autoclaves, and plywood was left in it to drain the residual phenol alcohol for 30 minutes. The total absorption of phenol alcohols is 230.2 kg / m, the wood humidity rises from 8.1

Claims (2)

30 to .27.4%. After the flow of phenol alcohols, the .45 device With a fanbro is transferred from the autoclave to the drying chamber and dried at 38-45 ° C for 20 hours and humidity 8-12% and then with increasing temperature. 10–20 ° per hour to 100–120 ° C, after which curing is carried out for 4 hours. After it has been removed, the plywood is cooled to 40–45 ° C in a rigid device, after which it is removed from the device. Example 2. Base wood construction details of 20x150 mm in size, kDK in Example 1 with the difference that the impregnation is carried out at a pressure of 1.3 MPa for 150 min. Suzhu is carried out at 4045 0 for 48 h, the temperature is raised to within 6 hours, and curing at 120 ° C for 2 hours. Obtained as stated; : in the way modified wood materials do not have cracks and warping, while when modified without mechanical pressure and without the use of a stepped temperature rise during drying, the resulting products have warping and traciny. DETAILED DESCRIPTION OF THE INVENTION A method for modifying wood materials, including impregnating wood material with phenol alcohols, drying and opening, characterized in that, in order to reduce distortion and cracking of wood material during modification, it is impregnated with phenol alcohols, drying and curing under mechanical pressure on the wood material 0 , 05-0.1 MPa, and drying is carried out first at 38-45 ° C to 8-12%, and then with increasing temperature to 100-120 ° C at a rate of 1020 per hour. Sources of information "taken into account in the examination of 1, Sat, Wood modification with synthetic polymers, Ed. Vikhrova, Minsk, VTI, s, 51.61-72.96, 2. USSR author's certificate No. 404620, class, B 27 K 3/08, 07/05/71 (prototype).