SU929672A1 - Process for activating kaoline - Google Patents

Description

(I) METHOD FOR ACTIVATING KAOLIN

I

The invention relates to methods for activating kaolin for use as a filler for polymeric and paints and varnishes.

A known method of activating kaolin by calcining its particles at kOQ-SQff to remove most of the chemically bound water fl.

There is also known a method for activating kaolin by drying it and then treating it with a solution of an organic aminoalkyl-containing compound at 110 ° C for about 30 minutes. As amine-containing compounds, it is envisaged to use such compounds as, for example, hexylamine, octadecylamine, butylamine, dimethylaminoethyl methacrylate t21.

A disadvantage of the known methods is the low capacity of kaolin particles for the adhesion and cohesion of polymeric materials. In addition, in a known manner, treated kaOLIN does not accelerate the curing process of varnishes, for example, based on unsaturated polyether maleate resins.

The purpose of the invention is to increase the ability of kaolin particles to increase adhesion and cohesion and shorten the curing time of urea adhesives and polyester varnishes.

This goal is achieved by the method of kaolin activation by treating it with an amine-containing compound in the form, | -diamino-ZSZ -dichlorodiphenylmethane with its weight ratio to kaolin (0.215) :( 85-99.8), at 60-110 ° for 0.5-1 h:

It has been established that in the process of activation or sizing in this method, chemical grafting of the molecules of the indicated amine containing compound to calcined kaolin, which is Al aluminum silicate (i Oy2SiO), occurs, forming a structure having an intense wide band in the region of 3 503570 cm characteristic of hydroxyl In this case, the treated kaolin essentially does not produce weak absorption bands in the region of 3300 s, which are in the spectrum of 4-diamino-3,3-dichlorodiphenylmethane, characteristic of aMMHorpynn-NHrj.

The optimal amount of the proposed compound for activation is determined as follows.

The amount of modifier on the kaolin surface is 0.2% insufficient for shortening the curing time of paint and varnish compositions.

So the curing time of carbamide glue with the addition of 0.5-U of thus modified kaolin is 80-90 s, which makes it impossible to use it for the process of veneering chipboard on single-span presses.

Increasing the amount of modifier more than 15% by weight of kaolin leads to preliminary gelatinization of polyester lacquer, reduces the viability of the working lacquer compositions to 0.5 h instead of 2 h.

In addition, the introduction of 0.8% kaolin modified with this compound, 8 more than the upper limit, into the polyester coating makes the latter a brittle substance reducing its hardness by a factor of 2 to 0.3–0.35 in instrument M-3 instead of 0.6-0.65, provided that kaolin is modified within the proposed limits.

For example, when using activated kaolin in polyester lacquers, the following quantities of apparatus are sufficient, parts by weight: 0.2 4, -diamino-3.3 Dichlorodiphenylmethane per 99.8 kaolin. In this case, the finished kaolin helps to shorten the curing time of the polyester varnish from 2 hours to 0.5 hours.

The proposed method of kaolin activation is carried out for 30-60 minutes, depending on the amount of sizing and the temperature of the activation process.

It has been found that with increasing temperature, the rate of activation process increases. However, with full activation, it is advisable to carry out the process at low temperatures.

, due to the elimination of evaporation of 4,4-diamino-3,3 Dichlorodiphenylmethane, with partial activation, the process is carried out with PP-SC with the aim of a high activation rate and a decrease in the size of the coupling agent.

PRI me R 1. The kaolin is activated by heat treatment in the presence of i, α-diamine-3,3-dichlorophenylmethane for 1 hour with the following content of ingredients, wt.

Kaolin85

, 4-diamino-3,3-dichlorodiphenylmethane 15

EXAMPLE 2 The kaolin is activated by heat treatment of the kaolin in the presence of 4-diamino-3, 3-dichlorodiphenylmethane for 50 minutes with the following content of ingredients, wt.

Kaolin90

k, k-Diamino-3,3-dichlorodiphenylmethane 10

EXAMPLE 3 The kaolin was activated by heat treatment of the kaolin in the presence of J V-diamino 3 3 Dichlorodiphenylmethane for kQ min with the following content of ingredients, wt.

k, k-Diamino-3, 3-dichlorodiphenylmethane3 Example. The kaolin is activated by heat treatment of kaolin in the presence of k, α-diamino-3, 3 Dichlorodiphenylmethane at 100 ° C - for 30 minutes with the following content of ingredients, wt.h .: Kaolin 99.8 4, V diamino-3, 3 -dichlorodiphenylmethane 0.2

The table presents data on the adhesion, cohesion and curing time of the carbamide adhesive grade UKS-B

and polyester varnish of the type with the addition of pure (non-activated) kaolin and kaolin activated according to the invention k, C-diamino-3, 3-dichlorodiphenylmethane

in accordance with the described examples in comparison with the known method of activated kaolin p-propylamine.

5,9296726

The proposed invention is cured to c, and npid in a manner provides for obtaining a polyester lacquer to increase

lina, which when introduced into the composition of the latter to wood to

carbamide adhesives increase adhesion 115 3 11b, 5 kgf / cm, cohesion - to.

them to wood up to, kgf / cm, s 121.3-125.33 kgf / cm and reduces

adhesive cohesion is up to 5b, 2-57 3 kgf / cm polyester curing time,

and helps to reduce the opening time to 0.5-1 hours.

Urea adhesive Clean 2k, 6 19.5 75-90 with

Polyester lacquer 91.0 105.0

Clean

Claims (2)

Claim 1. Method of kaolin activation, including treating it with an amine-containing compound when heated, characterized by the fact that, in order to increase the ability of kaolin to increase adhesion and cohesion 2 h and shorten the curing time of carbamide adhesives and polyester lacquers; 4, -Diamino-3,3-dichlorodiphenylmethane is used as the amine compound and its weight ratio to kaolin (0.2-15): (85-99.8). 79296728 2. The way no p. 1. about t l and m a -. The sources of information, that with the fact that the processing is taken into account in the examination of the specified amite-containing compound, i. U.S. Patent No. 3,961,171 by dinineation is carried out at 60-100 ° C in cl. 106-72, published. 1976. for 0.5-1 m. 5 2.-US patent number 1 | 1295 9, cl. R, published in 1978.