RU2616924C1 - Adhesive composition on the basis of powder-coating thermo-active polymers - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: adhesive composition comprises urea-formaldehyde resin obtained from 53-57 wt h the urea-formaldehyde resin powder and 47-43 wt h water, ammonium chloride and active shungite sorbent mixture of wood flour with the following component ratio, wt h: urea resin - 90-95; ammonium chloride - 0.5-1.0; active mixture of wood flour and shungite sorbent - the rest.

EFFECT: invention reduces the free formaldehyde content, reduce the amount of the main components, to increase bonding strength, and also reduce the curing time of the adhesive composition and, consequently, improve productivity.

2 tbl

Description

Known adhesive composition comprising a urea-formaldehyde resin hardener ammonium chloride NH ₄ Cl and an active filler, in which the adhesive composition contains natural shungite sorbent (ShS) (RU 2437911, publ. 27.12.2011, bull. No. 36 - prototype).

The disadvantages of the known adhesive compositions are the toxicity of adhesive compositions and plate materials made with their use, low adhesive strength, high water absorption and water swelling.

The technical task of the invention is to improve the quality of the adhesive composition by reducing the toxicity of the adhesive and finished products, increasing the strength of the adhesive joint, reducing the consumption of the main components, as well as improving the ecology of the production of glued materials.

The problem is achieved in that the adhesive composition, comprising a powder of urea-formaldehyde resin, water, an active mixture of wood flour and shungite sorbent, ammonium chloride.

The content of the components may be as follows, wt. hours,%:

urea-formaldehyde resin powder 53-57 water 47-43

Got the resin.

Urea-formaldehyde powder resin 90-95 Ammonium chloride 0.5-1.0 Active mixture of wood flour and shungite sorbent 4,5-9,0

The invention has the following differences from the prototype.

The adhesive composition is made of urea-formaldehyde resin powder, and as an active filler it contains a mixture of wood flour and shungite sorbent.

The content of the components may be as follows, wt. hours,%:

urea-formaldehyde resin powder 53-57 water 47-43

Got the resin.

Urea-formaldehyde powder resin 90-95 Ammonium chloride 0.5-1.0 Active mixture of wood flour and shungite sorbent 4,5-9,0

This will improve the quality of the adhesive composition by reducing the content of free formaldehyde, reducing the consumption of the main components, increasing the strength of the adhesive joint, as well as reducing the duration of the curing of the adhesive composition, which will increase the productivity of press equipment and improve the ecology of the production of plate materials.

In our patent information fund, we did not find similar technical solutions, as well as technical solutions containing these characteristics.

The invention will be applicable in the industry in 2016.

The following materials were used to make the adhesive composition:

Urea-Formaldehyde Powder Resin UF1G-A-2007

Wood flour GOST 16362-79

Shungite sorbent TU 2164-002-73698942-05

Hardener ammonium chloride GOST 2210-73

The adhesive composition was made as follows.

EXAMPLE

Depending on the ratio of components, glue for research was prepared in an amount of 150 ... 200 ml. The glue components were introduced with constant stirring with a mixer with a speed of 240 rpm in the sequence: the dry resin is mixed for 2 minutes with wood flour and shungite sorbent and after 2 minutes with a dry hardener, and then the mixture is loaded into water at a temperature of 20 ± 1 ° C. This glue preparation procedure reduces clumping of the mixture. Table 1 shows the compositions of the adhesive compositions and their physico-chemical properties of the examples.

Given that the urea-formaldehyde polymer cures in an acidic environment, ammonium chloride, which is traditionally used for hot bonding, was used as a hardener. The amount of hardener introduced, taking into account the pH of the resin: 0.5-1.0 wt. hours per 100 wt. including liquid polymer. Based on experimental data, rational compositions of adhesive compositions, wt. hours,% (table. 1).

Adhesives with these characteristics are suitable for gluing veneers with prepress for 5 hours from the date of preparation.

Thus, the invention will reduce the toxicity of the adhesive composition and products manufactured with its use (plywood, veneered plywood, etc.), increase the strength of adhesive joints, reduce the curing time of the adhesive composition, which ultimately will increase the productivity of press equipment, improve environmental conditions production of adhesive composition and the use of finished products.

Claims (2)

An adhesive composition comprising urea-formaldehyde resin, shungite sorbent, ammonium chloride, characterized in that it contains an active mixture of shungite sorbent with wood flour and urea-formaldehyde resin obtained from 53-57 wt. including powder urea-formaldehyde resin and 47-43 wt. including water, with the following content of components, wt. hours: Urea-formaldehyde resin 90-95 Ammonium chloride 0.5-1.0 Active mixture of wood flour and schungite sorbent rest.