SU1089096A1 - Antiseptic - Google Patents

Abstract

The use of hydrolytic lignin as an antiseptic in the manufacture of wood-fiber boards by the dry method. (L

Description

00 with about

The invention relates to the woodworking industry and the hydrolysis technology of penning, in particular to the use of lignin in the production of wood-based NFS-fibrous plates by the dry method. It is known to use hydrolytic lignin to produce building materials using mineral m. Known antiseptic for plates zj A disadvantage of known substances is the low bio-resistance of plates. The purpose of the invention is to increase the bio-resistance of the plates. This goal is achieved by using hydrolytic lignin as an antiseptic in the production of fibreboard by the dry method. . Hydrolyzed lignin is crushed at pressfine. Where, on the one hand, the particle size decreases due to destruction of coarse fractions, and volumetric compaction of the lignin mass occurs under the influence of mechanical loads, which results in the activation of lignin, on the other hand, grinding reduces lignin moisture content up to 2535%. After grinding, the lignin is fused on vibrating screens and sent to the production of fibreboard. The use of the dry method of forming the slab avoids the loss of lignin into the wastewater when the carpet is molded. The fluffed lignin is sent to a second-stage dryer, where it mixes with the fiber and is dried to a moisture content of 6-10%. Next, the fiberglass mixture is sent to the technical composition of wood-fiber boards.

TABLE 1 is a nological process for the production of fibreboard in the usual way. Hot pressing is carried out at 205-215 C in accordance with the standard dry mode of production of fibreboard. Designed plates have the following composition, May.%:. Wood fiber 65-77 Crushed hydrolytic lignin 20-30 Binder3-5 SFL-3014 phenol-formaldehyde resin or KS-68M carbamide resin is used as a binder. Example 1. Fiber boards are manufactured having the following composition of ingredients, May.%: Wood fiber 75 Shredded hydrolyzed lignin 20 Urea resin KS-68M5 Shredded hydrolyzed lignin fluffed on vibrating screens is sent to a second stage dryer where the hydrolysis lignin is mixed lignin with resin-treated fiber and water-repellent as per standard method. After mixing, the mixture is sent to the forming nashin and then to the wood fiber production stream. plates on. standard technology. . Examples 2-12. The production of wood-fiber plates is similar to Example 1. The plates differ in the content of ingredients. The compositions of the plates in examples 2-12 are presented in table.1.

76 77 65 66 67 75

20 20 30 30 30 20

76 77 65 66

67

20 20 30 30 30 Components

Urea

resin

KS-68M

SFZH-301A Phenol Formaldehyde Resin For Comparison. Fiber Wood Control Samples are Made. Control Compositions

Wood fiber

Urea resin KS-68M

Phenol formaldehyde resin SFZH-3014

Manufacturing technology control plates eliminates the stage of input; and lysis of lignin.

Fiber boards manufactured using hydrolyzed lignin, as well as control plates, are 5 mm thick and have a density of 110.1 g / cm.

All wood-fiber boards, obtained using hydrolyzed lignin, according to their physicomechanical properties, satisfy the requirements of Specifications 13-444-79 (Table 3).

In all fibreboard made with hydrolysis lignin, the bioresistance was determined (Table 4). Caniophora puteana house mushroom was used as a test organism. Mushrooms were sprayed on vermiculite with a moistened unchmetered beer wort. After

Continued table. one

A3

5 43 5 4 3

96 97

95

97

their growths were stacked with sterilized prototypes. Sterilization

carried out by flaming, since during fibrillation in an autoclave with volatile steam, fiber boards can be delaminated. The flasks with the fungus and the samples were placed in a thermostat in the enclosed room and held for six weeks at 25-27 C. Then the samples were removed from the flask, cleaned from the mycelium and dried to

constant weight.

The weight loss of the sample is calculated

according to the formula m-th

R . 100%

m where P is the mass loss,%,

W is the initial mass of the samples; m is the mass of the samples after exposure to the fungus.

Physico-mechanical properties of the plates are given in table 3. Composition, May.%, Following the example of iZlniirOZlLnilEEEnLEi tk plates, the compositions of which are given in Table 2. Tables 2 Fiberboard

Table 3

Physicomechanical properties of fiberboard

An evaluation of the change in the mechanical strength of the samples during biodegradation employs an adstructive dynamic shear modulus, which allows the analysis of the mechanical properties of the sample before and after aging (Table A).

Table A Bio-resistance of fiberboard

The decay of mass loss and the nature of the change in the dynamic shear modulus show that wood-volokii boards made with applied10890968

It has 60 thousand tons of hydrolysis plant for a plant with high biostability. 25 million m of wood fiber; Apply hydrolyzed ligninate plates per year and reduce consumption

as an antiseptic in the production of wood in the production of wood-fiberboard dry-5 fiberboards.

This method of molding allows the semi-

To produce a biostable material for a mill-fiber fiber by hydrolyzing ligand housebuilding, it is 15–25 rubbles. on

hydrolysis lignin in the amount of 20-1000 m fibreboard.

Claims (1)

The use of hydrolytic lignin as an antiseptic in the production of dry fiber boards. With The invention relates to the woodworking industry and the hydrolysis industry, in particular to the use of lignin in the production of dry fiber boards. It is known to use hydrolytic lignin to obtain building materials using mineral binders. Known antiseptic for plates [i]. • A disadvantage of known substances is the low biostability of the plates. The purpose of the invention is to increase the biostability of plates.