DE2049158A1 - Preparations for the manufacture of waterproof concrete and cement mortar products - Google Patents

Description

South German calcium cyanamide works. Trostberg, September 24, 1970

Sir our sign:

(Erostberg _{pat> 49 / Κι} _ _ΙΒ .

Preparations for the manufacture of waterproof concrete and cement mortar products

The invention relates to a means for producing water-impermeable Concrete and cement mortar products.

It is already known in the manufacture of waterproof cement products, especially in the manufacture of plasters or screeds, the cement mixes water-soluble sealants based on alkali silicates, alkali aluminates, Add Fe (OH) ,, fats, fatty acids etc. (Austrian patent specification 192 838).

Sealing and bonding agent as an additive for cement. Or cement containing mortars made from alkali grease soaps, alkali resin soaps, NaOH and G-lycerin as well as AlCl ^ / NaOH and KOH / NaOH / CaClo were in Swiss patent 372 967 and in German Auslegeschrift 1 057 002 described.

Diet; However, Lekarmleü sealants affect strength the concrete or cement products unfavorable.

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The object of the invention was to create a means which does not have this disadvantage.

It has been found that an agent consisting of 50-80 wt .- ^ sulfonic acid group-containing melamine-formaldehyde condensation products a viscosity of 5-300 cP, measured in an aqueous solution containing 20% by weight of pesticide, and 50-20% by weight of Me " tall stearate as well as possibly other known sealants that meet the required condition.

The melamine-formaldehyde condensation products mentioned are commercially available. They are manufactured according to Austrian patent specification 263 607.

Surprisingly, the agent according to the invention works both strength-enhancing (example 1 and 2) as well as increasing hydrophobicity (example 3) on the concrete or cement mortar products, whereby a synergetic effect was found to the extent that the strength-increasing soil, which is known per se Effect of melamine-formaldehyde condensation products containing sulfonic acid groups on building materials in the presence of stearates known per se as sealants and at the same time the well-known water repellent. Effect of the added stearates is improved.

The metal stearates used are preferably alkaline earth metal, zinc, aluminum and copper stearates.

Up to 50 percent by weight of the metal stearate content can be achieved by aluminates be replaced.

The agent according to the invention must be the concrete and cement mortar mixes be added during the mixing process so that it is evenly distributed in the building material mix is. There is no need for sealants that are only subsequently applied to the finished products . thus one operation. The sealant is particularly suitable as an additive for plasters and screeds that can be walked through.

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The invention is explained below by way of example:

Comparison example:

Standard prisms were produced with commercially available Portland cement 275 according to DIN 1164 E (fit 1967) with a constant slump (18-1 _cm; ). A sealant B, ie a commercially available sealant based on aluminate and alkaline earth stearate, was added to standard prisms 2 and 3. After one day, the prisms were switched off and a part was tested immediately, and a part was stored in a normal climate at 20 ° C. and 65% relative humidity until the test.

Composition of sealant B:

2.2 Wt.TIe. Calcium stearate 1.5 M. Potassium aluminate 1.6 η Calcium hydroxide 6.3 ^M. Potassium hydroxide 1.2 ^M. Sodium hydroxide 87.2 ti water

) Sealant Bj> 3
> raised
cement

Water / cement factor

Flexural strength £ / 2j

24 hours 28 days

Compressive strength {] kp / cm ² after

24 hours 28 days

O
10

0.51 0.49 0.52

15 19 20

40 54 198 45 65 178 47 63 134

Example 1i

Standard prisms were produced with commercially available Portland cement according to DIN 1164 E (fit 1967) with a constant slump (18 - 1 cm) with and without additives. After one day, the prisms were switched off, some of them were tested immediately, and the best was stored in a normal climate at 20 ° C. and 65% relative humidity until the test.

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Additions related to cement ¹ Sealing
medium B Water/ Flexural tension
2 strength 'Druckfe sturdiness Resin A ^χ ) 0 ,, Cement-
Pactor [kp / cm J after [kp / cm ^ j after 0 0 0.51 24 hours 28 days 24 hours 28 days 5 10 0.46 15th 40 54 198 5 20th 0.45 50 67 140 576 5 0.50 44 86 154 448 44 67 142 331

x) Resin A is a melamine-formaldehyde condensation product containing sulfonic acid groups and having a viscosity of 10 cP, measured in an aqueous solution containing 20 μl of solid resin.

Such resins are commercially available under the name ilelment ^ L 10 or P 10 available.

cn OO

204B158

At spi it! 2 χ

In each case 2 lime sandstone cubes with an edge length of 4 cm were glued with cement paste and after 24 hours the shear strength was determined on the glued surfaces. The cement pastes were produced with a water ~ cement value of 0.37.

Additions related to cement weight Sealant C ^xx ) Shear strength Resin B «) m [kp / cm ^ J in without addition after 1 day without addition 0.2 0.7 Il 0.4 0.9 H without addition 0.7 10 0 * 2 5.4 10 0.4 5.4 10 without addition 4.9 20th 0.2 7.1 20th 0.4 7.8 20th 6.8

x) Resin B is a melamine formal containing sulf / acid groups " dehyde condensation product with a viscosity of 96 cP. (Measured at 20 ° G with the Brookfield rotational viscometer, -Model HAT, spindle No. 1, 20 revolutions / minute.) Such resins are commercially available under the name Melment® L 300 or F 300,

xx) Sealant C is commercially available zinc stearate.

Example 3:

To test the water-repellent effect, analogously to Example " 1 standard primer made of Portland cement 275, standard sand, neutral zinc stearate and sulfonic acid group-containing melamine-formaldehyde condensation products a viscosity of 10 cP, measured in an aqueous solution containing 20 wt .- ^ pesticides, according to DIN 1164 B. (Version 1967) produced and water suction and water absorption determined for underwater storage.

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EAD ORiGINAL

The combination of zinc stearate and resin A has a hydrophobic effect

O CO OD

Additions, "related to the Zeaentgeweht MeutraJLes zinc stearate; Water absorption Water absorption Resin A ^ j
in ι without addition \ Pawn of absorption
from. 0.05 ml of water
[Seconds] at 24 hour
Underwater storage without addition without addition 28 5.4 5 ! 0.4; 124 3.9 oiane addition ' o, 4; 102 4.4 5. : 0.8! 380 '2.7 Dim «addition j O ₉ S j 839 3.1 more than 1800 1.4

: x.) Resin A v «er.gl .. Example 1 ,.

Additional Tsroa 5 ^ A resin proved to be a farmer sheep tiioiies ■■ - optimum, an effect was already yon 'ibei .Zugabe, 2,5 * $> A resin found.

Claims (4)

Claims ί 1. j Agent for the production of water-impermeable concrete and cement mortar products, ordered from 50-80 wt .- $ sulfonic acid group-containing melamine-formaldehyde condensation products with a viscosity of 5-300 cP, measured in an aqueous solution containing 20 wt .- ^ solids, and 50 - 20 wt .- ^ metal stearate and possibly other known sealants. 2.) Means according to claim 1, dadurcli characterized in that it
Contains alkaline earth metal, zinc, aluminum, copper stearate. 3 ·) Means according to claim 1 and 2 _f, characterized in that up to 50 wt .- ^ of the metal stearate content are replaced by aluminates. 4.) Process for the production of waterproof concrete and cement mortar products, characterized in that the means according to claims 1-3 the concrete and cement mortar mixes be set during the Kischvorgengs & uget and these are further processed in the known way. BAD CPJGfNAL 209816/1222