FI65418C - Use of sulfonic acid groups containing anionic melamine-formaldehyde condensation aqueous solutions as additives in building materials - Google Patents

Description

PATENT PUBLICATION 6541 8

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(51) Kv.lk3 / lnt.ci3 C 04 B 13/28, 1 (^ (5) (21) Patent application - Patentansökning 8 0 0 2 0 * 4 ^ --- y— ^ (22) Application date - Ansökningsdag 2 * 4. 01.80 (23) Start date - Giltighetsdag 13 * 11. 7 * + SUOMIFINLAND (41) Has become public - Blivit offentlig 2 * 4.01.8 0 / pi \ (44) Date of broadcast and publication - 31 01 8 ^ 4

VV Ansökan utlagd och utl.skriften publicerad J

(45) Patent granted - Patent meddelat 17.12.87

National Board of Patents and Registration (86) International application - int.ansökan

Patent-och registerstyrelsen (32) (33) (31) Privilege claimed - Begärd priority 28.11.73

German Federal Republic-Förbundsrepubliken Tysk1 and (DE) P 2359291.8 Toteennäytetty-Styrkt (73) Siiddeutsche Ka 1 kst ickstof f-Werke Akt ienqesel 1 Schaf t, Trostberg / Obb. ,

Federal Republic of Germany Förbundsrepubliken Tyskland (DE) (72) Alois Aignesberger, Trostberg / Obb., Paul Bornmann, Traun / Obb.,

Hans-Gunter Rosenbauer, Trostbert / Obb. , Hans Theissig, Trostberg / Obb.,

Federal Republic of Germany Förbundsrepubliken Tyskland (DE) (7 **) Berggren Oy Ab (SM byggnadsmateria] (62) Divided by division 3290/7 ** (patent 57769) ~

Avdelad frän ansökan 3290/7 ** (patent 57769)

The invention comprises the use of an aqueous solution of a high solids melamine-formaldehyde condensation product containing anionic sulfonic acid groups as an additive for building materials to improve their properties.

A process for preparing water-soluble condensation products containing sulfonic acid groups is already known from U.S. Pat. No. 2,730,516. A special feature of these condensation products is that they do not cure under the influence of heat. Therefore, they have use, for example, as protective colloids, thickeners or emulsifiers. They are not suitable for improving the properties of building materials.

According to German application 1 671 017, solutions of a condensation product based on ainino-s-triazine, formaldehyde and alkali sulphite containing at least two amino groups with a solids content of only 20% by weight can be obtained.

2 65418

However, with a view to improving the building materials, such solutions with a higher solids content would be preferred. The object of the invention is therefore to eliminate these drawbacks.

According to the invention, this object is achieved by using an aqueous solution of a melamine-formaldehyde dicondensation product containing anionic sulfonic acid groups, prepared by a) melamine or a melamine-urea mixture containing up to 40 mol% of urea, formaldehyde and alkali sulfite, in a molar ratio of 1: 2: 8-3.2: 0.9-1.1, heated in aqueous solution o at a temperature of 60-80 ° C and a pH of 10-13 until sulphite is no longer detectable, b) then adjusted to pH 3.0-4 with an inorganic acid .5 and allow the condensation to continue at a temperature o ...

30-60 ° C for 30-90 minutes and c) heating the condensation product, after adjusting the pH to 7.5-9.0, at 70-95 ° C until the viscosity at 20 ° C and 20% solids is 5 ° C. -40 cP, as an additive to improve the properties of building materials.

Solutions with a solids content of 30-50% by weight can be prepared as mentioned above. By adding water, the solids content can be adjusted to the desired lower value in each case.

In the melamine-formaldehyde condensation products containing sulfonic acid groups used according to the invention, up to 40 mol% of melamine can be replaced by urea, as is apparent from the preceding definitions.

It is essential for the use of the condensation product that the viscosity of the solution at the end of the condensation is at a solids content of 20% of 5-40 cP.

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Examples of applications are repairing concrete damage, concrete tread, ceramic and glass adhesive, manufacturing floor coverings, concrete stones, plaster and paints, traffic tiles and aerated concrete, and preventing the formation of work joints in road construction.

The following examples first describe a process for preparing a solution of an anionic sulfite-modified melamine-formaldehyde condensation product to be used according to the invention containing 34.0% by weight of a solid, and thus its properties when added to building materials. It turns out that the test measure of the consistency of the test specimens of concrete and gypsum improves and their compressive strength increases.

A. Preparation of the Condensation Product Solution To 770 volumes of a 30% aqueous formaldehyde solution is added with stirring at room temperature 350 volumes of melamine, 280 volumes of Na 2 S 2 O - and 60 volumes of 20% NaOH. Heat to 75 ° C and keep at this temperature (about 1/2 t) until no more sulphite can be detected. It is then cooled to 50 [deg.] C. and acid (60 parts by volume of conc. H2SO4 in 900 parts by volume of H2O) is added until the pH is 3.8. Condensate at 50 ° C until the viscosity is about 300 cP / 40 ° C (duration approx. 1 / 2-1 h). Adjust to pH 8.0 (280 parts by volume with 20% NaOH). The condensation product is heated for approx.

1 h at 90 ° C until the viscosity is 12 cP / 90 ° C. It is then cooled and the pH is adjusted to 8.5.

Solids content: 34.0%

Viscosity at 20 °: 26 cP

Viscosity of a solution containing 20% solids: 9 cP

Example 1

The following concrete mixtures were prepared: 27.0 parts by weight of sand 0-4 mm 5.7 parts by weight of sand 4-8 mm 12.0 parts by weight of gravel 8-16 mm 18.3 parts by weight of gravel 16-32 mm

13.0 parts by weight of Portland cement 350 F

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Addition (e.g. 1) of the water-leveling condensation product of the invention according to the ratio of cement to DIN 1048. of cement weight cm no increase 0.45 40 0.9% 0.45 60 1.5% 0.40 60

Example 2 According to DIN 1164, test specimens were prepared 4 x 4 x 16 cm. Leveling compound: 18 + 1 cm

Storage until study in normal climate 20/65 Cement: portland cement 350 F

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Claims (2)

7 65418 Pate's claims Aqueous solutions of melamine-formaldehyde condensation products containing anionic sulphonic acid groups prepared by a) heating melamine or a melamine-urea mixture containing up to 40 mol% of urea in aqueous solution, formaldehyde and alkali sulphite in a molar ratio of 1: 2.8-3.2: 9 o -1.1, at a temperature of 60-80 ° C and a pH of 10-13 until sulphite is no longer detectable, b) then adjusting the pH to 3,0-4,5 with inorganic acid and continuing condensing at 30-60 ° C for 30-90 minutes, and c) adjusting the pH to 7.5-9.0 and heating the condensation product at 70-95 ° C until the viscosity is At 20 C and 20% municipal substance content is 5-40 cp, use as an additive to improve the properties of building materials. Use according to Claim 1, characterized in that the solution has a solids content of 30 to 60% by weight.