CS252546B1 - Actively filler for adhesives and its production methods - Google Patents

Abstract

The adhesive filler contains 15 to 55 wt. parts of lignocellulosic material with a grain size of 0.05 to 1 mm, 5 to 15 wt. parts of sodium hydroxide or potassium hydroxide and water in the amount of 40 to 70 wt. parts, while the resulting dry matter is 30 to 60% by mass. The production method is carried out in such a way that the disintegrated lignocellulosic material with a moisture content of 5 to 20% by mass. and a fiber length of 0.05 to 1 mm is mixed with 5 to 15 wt. parts of sodium hydroxide or potassium hydroxide with a concentration of 5 to 30% by mass. and 40 to 70 wt. parts of water at a temperature of 10 to 50 °C, for a period of 15 to 90 min.

Description

25 2546

The present invention actively solves the filler in the adhesive composition of the present invention, which is a pre-premoreactive adhesive, particularly based on phenol formaldehyde resins, of a disintegrated lignocellulosic material, in particular wood waste.

To date, some inorganic powders such as kaolin, float chalk, bentonite have been used to fill phenol formaldehyde adhesives. The disadvantage of these fillers is that they do not actively participate in the adhesive process and increase the hardness of the glued joints, making mechanical machining of the glued materials difficult. Furthermore, fillers are known to provide lignocellulosic materials, such as some types of wood torture. Their disadvantage is that they are not actively and their presence in the adhesive is adversely affected by the properties of the adhesive bond. So far known methods of producing chemically active fillers for thermoreactive adhesives are based on the physico-chemical treatment of waste lignocellulosic materials by exposing the effect of the exactly required moisture in the presence of acidic catalysts under high pressure and temperature, e.g. AO of CSSR No. 155 568. The disadvantage of this process is the high labor intensity, energy demand and the requirement for subsequent mechanical treatment of the filler to a suitable processing form. In the borderline used actively fillers for base-extracts of some exotic woods are inefficient for the purpose.

The described disadvantages of the current state of the art are actively removed by the filler in the adhesives according to the invention, which consists of 15 to 55 parts by weight of lignocellulosic material, in particular waste from production and processed and laminated and agglomerated materials, with a grain size of 0.05 and 0.05. from 1 to 1 mm, 5 to 15 parts by weight of sodium hydroxide or potassium hydroxide and water in an amount of 40 to 70 parts by weight, the resulting filler solids being 30 to 60% by weight. The process for producing the active filler in adhesives is that 0.05 to 1 mm and a moisture content of 5 to 20% by weight is applied to the de-integrated lignocellulosic material with a fiber size and fiber length. % to 15 wt. sodium hydroxide or potassium hydroxide at a concentration of 5 to 30% by weight. and 40 to 70 wt. 10 to 50 ° C for 15 to 90 minutes.

The higher effect of the filler according to the invention shows that in the addition of 5 to 30 wt. the weight of the adhesive composition is consistently replacing the phenol formaldehyde resin while maintaining or improving the quality of the bonded joint while shortening the molding process. The method of production according to the invention is technologically unpretentious and makes it possible to evaluate the industrial waste wood industry. At the same time, the addition of a filler adhering to the compositions reduces the leakage of hygienically monitored pollutants, such as formaldehyde and phenol from the bonded materials, and significantly reduces the cost of adhesive compositions and bonded materials. Example 1

Per 1000 g of spruce dust with fiber length from 0.05 to 1 m < 3 > with an aqueous solution of sodium hydroxide at a concentration of 20% by weight. 1500 g in a non-pressurized kneader at 90 ° C for 90 minutes. In the described method, a filler with a dry weight of 50% by weight is obtained actively. total content of a'kali 12% wt. R e r 1 a d 2 -

For 1000 g of beech-chipboard particleboard dust with fiber length of 0.05 to 0.8 mm moisture of 7% by weight. with an aqueous solution of sodium hydroxide at a concentration of 7% by weight. at 2800 g priteplote 15 DC in pressureless kneader for 60 minutes. In this way, the active filler with a dry weight of 30 is obtained. wt. with a total alkali content of 15pere. wt. Example 3

Per 1000 g of abrasive dust from abrasive bristles with a fiber length of 0.05 to 0.5 mm and a thickness of 10% by weight. is treated with an aqueous solution of potassium hydroxide at a concentration of 30% by weight. 1000 g in non-pressurized kneader at 35 ° C for 20 min. Described by the method of the present invention, the active ingredient actively slugs a dry weight of 60% by weight. 15% wt. Example 4

For 1000 g of beech plywood abrasive dust with a fiber length of 0.05 to 1 mm and a thickness of 20% by weight. a sodium hydroxide solution of 30 wt. in an amount of 900 g in a pressureless kneader at 45 ° C for 30 min. In this way, a filler of dry weight of 56% by weight is obtained. with a total alkali content of 14 wt. Example 5

Per 1000 g.and hardwood pulp fiber with a fiber length of 0.05 to 0.5 mm and a moisture content of 8%. with an aqueous solution of sodium hydroxide at a concentration of 18% by weight. at 270 g in a pressureless kneader at 20 ° C for 90 min. In this way, the filler is actively obtained in a 50% wt. with a total content of 10 wt.

Actively filler for adhesives, especially for

Claims (2)

252346 of phenol formaldehyde resins according to the invention can advantageously be used in the wood industry, especially in the production of plywood, laminated and composite materials. OBJECT WHAT IS CLAIMED IS: 1. An acrylic filler for adhesives, in particular phenoxy formaldehyde resins, characterized in that it comprises 15 to 55 parts by weight of lignocellulosic material, in particular waste from the manufacture and processing of laminated and agglomerated materials, wood base plated with a grain size of fibers of 0.05 to 1 mm, 5 to 15 parts by weight of sodium hydroxide or hydroxide potassium and water in an amount of 40 to 70 parts by weight, the resulting filler solids being 30 to 60% by weight. THE INVENTION 2. A method for producing an active filler according to claim 1, wherein 15 to 55 wt. parts of a disintegrated lignocellulosic material having a fiber size and a fiber length of 0.05 to 1 mm and a moisture content of 5 to 20% by weight. 5 to 15 wt. parts of sodium hydroxide or potassium hydroxide at a concentration of 5 to 30 wt. and 40 to 70 wt. 10 to 50 ° C for 15 to 90 minutes.