DD224603A1 - METHOD FOR PRODUCING AMINO ILLUSTRATIVE MASSES - Google Patents

Abstract

The aim and object of the invention is to modify in particular inorganically filled Aminoplastformmassen in their flow and Haertungsverfahren so that a low-cost processing is also possible to complicated moldings without Versproedung or Haerterissbildung occur. According to the invention, at least one N-substituted aminoalkane diphosphonic acid is added to the aminoplast molding compositions before or during the homogenization at a molding compound moisture content of 10%.

Description

Process for the preparation of aminoplast fortifications

field of use the invention

The invention relates to the preparation of fast-curing, preferably inorganically filled Aminoplastformmassen.

Characteristic of the known technical solutions

It is known for the preparation of fast-curing Aminoplastf ormraassen acidic substances such. As phthalic acid, salicylic acid or p-toluenesulfonic acid. However, the use of such curing catalysts has the disadvantage that an acid-catalyzed postcondensation of the molding compositions occurs even at room temperature and thus greatly reduces the storage stability of such molding compounds. This negative property is circumvented by the use of substances that react basic or neutral at temperatures up to about 80 ⁰ C and only show an acidic effect at the higher processing temperatures. The group of these substances called latent hardeners is large. Are known esters of aliphatic alcohols with organic and inorganic acids, substances with reactive halogen atom such. B. benzyl chloride, epichlorohydrin, water-soluble Halogentriazinsalze and cyclic Sui-

fite, polyesters of aromatic sulfonic acids and polyhydric aliphatic alcohols (Sachraann, Bertz: Aminoplaste, Leipzig 1970, p. 47). Also amines, such. As diethanolamine, are used as latent hardness (DE-PS 2,911,265). The fast-curing arainoplast molding compositions prepared using the known hardener have the disadvantage that there is a risk of local overcuring of the moldings produced therefrom, characterized by hardening of the hematite or embrittlement. Particularly critical is the use of strong hardeners in the already brittle, inorganically filled molding materials,

Object of the invention

The aim of the invention is to produce fast-curing, in particular inorganically filled Aminoplastformmassen that do not have the aforementioned deficiencies and disadvantages.

Explanation of the essence of the invention

The invention has for its object to modify the Aminoplastforramassen in their flow and curing behavior so that a favorable processing both in the pressing and in the injection molding and complicated moldings is possible without embrittlement or Härterißbildung occur.

According to the invention, this object is achieved by 'the Aminoplastformmassen before and / or during the homogenization at a Forramassefeuchtigkeit of j * * * 10 % at least one N-substituted aminoalkane diphosphonic acid or its salt of the general formula

ORO

OX

XO _n

p_ _c p ^

xo I ox

YY ¹

R = H, alkyl, aryl X = H ₁ alkali, NR *

0 8 Y '= C-R, preferably H

O O H

a)

Y '= CR, C - Ν-Υ ¹ '

ORO

^xo

_v /

Y "= H, C-R, P C P

XO OX

is added.

The proportion of N-substituted aminoalkane diphosphonic acid or its salt is 0.05 to 3 %, preferably 0.1 to 1 %, based on the Gesamtformraasse. The production of the novel Forramasse is carried out according to the customary for Aminopiastformmassen wet or Trockenimprägnierverfahren, wherein known per se resins obtained by condensation of aminoplast with formaldehyde, are homogenized with inorganic and / or organic fillers.

The N-substituted aminoalkane diphosphonic acid may also be used in admixture with other phosphonic acids (eg, aminoethanediphosphonic acid) and phosphate. According to the process of the invention, a fast-curing molding composition is obtained which ensures the same production.

-A-

moderately cured moldings with increased flexural strength, impact resistance and impact strength and which is particularly suitable for injection molding due to their flow-hardening behavior. Table 1 shows the influence on the flow hardening behavior (according to Kanawez) by various curing catalysts using the example of a 40 parts by weight of meiamine-foraldehyde resin (spray-dried) and 60 parts by weight of ground chalk-containing aminoplastforramasse.

As can be seen from Table 1, is in the inventive molding composition in the temperature range up to 100 ⁰ C compared to the usual staggered with Hartu.ngsmitteln molding compositions only an extremely small catalytic effect a. This is of particular interest since cylinder or nozzle temperatures during injection molding are within the stated temperature range and, if possible, no curing should take place here.

Table 1

curing

V tool temperature closing time

Anfangsdrehmoiiient

Dwell time

0.2 parts by weight of salicylic acid

100 25 1.8 564 672 120 11 - <0.2 168 203 155 7 ~ SO, 2 69 82

0.2 parts by weight of phthalic anhydride

100 24 120 12 155 6

1.6 344 446 0.6 122 148 0.6 89 109

0.2 parts by weight 100 19 N-Acetylaminoethandi- 120 11 phosphonic 155 7

0.8 0.2 0.2

1416

375

The invention will be explained in more detail with reference to an embodiment, the two reference examples are preceded.

example 1

400 parts by weight of melamine-formaldehyde resin with a molar ratio of melamine: formaldehyde = 1: 1.8, 200 parts by weight of kaolin, 200 parts by weight of barium sulfate, 132 parts by weight of ground chalk, 60 parts by weight of iron oxide red , 3 parts by weight of silicone oil and 5 parts by weight T _e ile Mg stearate were granulated in a Intensivsnischer homogenized and anschliesend by means of a co-kneader.

Example 2

The aminoplast molding composition was prepared analogously to Example 1 with the difference that 3 parts by weight of salicylic acid were added to the batch prior to homogenization.

Example 3

A molding composition was prepared analogously to that described in Example 1, with 7.5 parts by weight of a mixture consisting of 30 % ureidoethanediphosphonic acid and 70% N-acetylaminoethanediphosphonic acid being added to the mixture prior to homogenization.

After grinding the aminoplast molding compositions prepared according to Example 1 to 3, an injection-moldable granular material was obtained, the flow-curing characteristics of which are shown in Table 2.

- 7 - Table 2

Flow-curing behavior of the molding compositions according to Example 1 to 3 (test according to TGL 25571) and selected mechanical values (test according to TGL 14067 or 14068)

example

Flow behavior according to Kanawez (tool temperature 155 C)

Hardening agent Closing Initial rotation Dwell hardening time Bending strength Impact bending time Moment resistance

(Wt%) (s) (Nm) (s) (s) (MPa) (10 / m ² )

6 0.7 61 73 59 2.4

0.3 6 -c: 0.2 35 37 39 3.3

0.75 8 0.2 30 39 69 4.5

Claims (3)

- 8 claim for invention Aniinoplastformmassen by condensation of melamine and / or urea with formaldehyde and homogenization of the resin with organic and / or inorganic fillers and optionally further additives and / or processing aids, characterized in that before and / or during the homogenization at a Forminassefeuchtigkeit 2 £ 10 % at least an N-substituted aminoalkane diphosphonic acid or its salt of the general formula ORO XO S J I ^ OX P ^- · C · "·" P xo 'j ^ ox R = H, alkyl, aryl X = H, alkali, NR ₄ ⁺ 0
ü
Y '= C - R, preferably H 0 Oh 8 a 1 Y = C-R, C-N-Y " 0 ORO     a ί · ί Y · · = H, C - R XO. ij 1, j OX ^ P- C- P ^ xo ^ ^N ox is added. 2. The method according to item 1, characterized in that the proportion of N-substituted aminoalkandiphosphonic acid or its salt 0.05 to 3 wt .-%, based on the Gesamtformraasse is.