DE1940510A1 - Extruded molded bodies - Google Patents

Description

Patent Attorneys ". Dipl.-Ing. EAYeickmann,

DiPL.-InG. H ^^ EICKMANN, D1PL.-PHYS. Dr, K. FlNCKE

Dipl.-Ing. F. A ^ Weickmänn, Dipl.-Ckem. B. Huber,

r 8 MUNICH 27, DEN

HZW - \ MDHLSTRASSE 22, CALL NUMBER 48 3921/22

Pat. 42 ■■ I: ■ '· ■■. "

Süddeutsche Kalkstickstoff-! Werke AG., Trostberg, and ffifra Le Lode S.d.r. 1., Iiei Lpcle NE / Switzerland

Extruded moldings

The invention relates to extruded molded articles made of inorganic Binders, fillers and additives.

■■ '■: ■ ■ ^: l ^:. ■■ '■ ^; -. ■■■ ^; . It is already a process for the production of shaped Aebestzeinent-Prodükten bekanntV after which a cement mixture consisting of 1.0 to 60 i a> Asbeätfasern, 10 to 85 $ cement and 14 to 50 fo water to ensure its Plaßtizität and dimensional stability during the _E Formungsrirozesse Hvdromodifier 25ugesetzt v; ird (Austrian patent specification 256 689). Conventional aggregates, such as sand, can be added to the mixture prior to the molding process. Organic substances with a molecular weight of over 400, for example methyl cellulose, ethylene oxide polymers, acrylamide-acrylic acid copolymers, polyvinyl alcohol, etc. can be used as hydromodifiers.

The production of components formed by extrusion from anhydrite-containing masses is known from German patent specification .814 421, small amounts of high molecular weight, glue-like substances, for example cellulose ethers, starch or the like, being added to the mixing water of the anhydrite. If necessary, these substances can also be added to the anhydrite during grinding,

10980370Ö32

The Austrian patent specification 205 400 describes a Te? ¹ - drive for the production of lightweight panels and insulating bricks from medium-fine ground inhydrite resin, gypsum and ceasers, if necessary with the addition of fillers such as sawdust, sawdust, chaff, reeds, yermieulite, etc., where the mass is mixed before extrusion and in a corresponding ¥ ox direction must be kneaded. .

Furthermore, in the German patent specification 812 414 a Yerfah.-fe ren for the production of components, such as roof tiles odea? described the like., in which natural or synthetic anhydrite to possibly after the addition of fillers is made into a paste with water, whereupon the jiasse is deformed in the extrusion or other customary implements.

In all of the manufacturing processes mentioned, difficulties arise during terpressing, which attempts are made to counteract these with suitable additives or certain grain sizes of the starting materials. A further technical part of this procedure is that the products are up to the point of achieving a.!? sufficient strength ibis must be stored for 2 weeks. If Uan wants to achieve a high level of strength more quickly, the products must be treated with cement and / or lime as a binding agent in the autoclave; in the case of products with calcium sulphate as a binding agent, this type of hacking treatment is not possible either

The aim of the invention is to provide a composition for " To develop moldings based on inorganic binders and fillers, which are both well extruded can achieve a high level of strength within a short period of time, without the need for autoclaving.

Compositions which contain at least one aminoplast resin containing acid groups and based on an amino * · B-triazine with at least two NH ₂ groups as an additive meet the required conditions.

109309/0932

The inventive extruded molded body based on inorganic binders and fillers is characterized by a content of at least one acid group Aminoplast resin based on an amino-s-triazine with at least two KHp groups as additional funds and, if applicable other additives.

It is surprising that according to the invention by a single Additives both good compressibility by extrusion and high early strength of the extruded Moldings can be achieved.

The acid groups which the aminoplast resin must have are preferably sulfonic acid groups.

Even small additions of the resin containing acid groups, ie 0.1 to 5% by weight, preferably even only 0.5 to 1% by weight, based on the binder used, are sufficient as additives, the figures relating to plague resin . Amitsoplast resins based on an aminostriazine with at least 2 NH ₀ groups and containing acid groups are preferably the

Cr)

commercially under -üLei? designation Melment ^ -relative liquid and solid resin types are used. This is Condensation products containing sulfonic acid groups Amino-s-triazines with at least 2 NHp groups and formaldehyde. The 20 $ aqueous solutions of these resins have viscosities of 5 to 300 cP.

In addition, small amounts of an anion-active surfactant, i.e. 0.01 to 1 wt .- $, preferably 0.05 to 0.1 wt. based on the binders used, for certain binder mixtures can be used appropriately as an additive. As a result, the compressibility is further improved without the Strength values are significantly impaired. Anion-active surfactants suitable for the addition are the commercially available ones

1098Ö9 / 0832

Products, e.g. sodium salts of alkylarylsulfonic acids or Sodium salts of a sulfated fatty acid condensation product., ■

Clinker and cements, calcium sulfate, magnesite binders and lime can be used as binders.

As fillers, they can usually be found in molded parts Substances used based on the above-mentioned binders, e.g. rock flour, sand (grain size max.15 "mm), Vermiculite, perlite, pozzolans, organic fiber materials such as cellulose, and inorganic fiber materials such as asbestos, Rock wool, etc.

When compressing anhydrite mixtures, it is useful as known stimulant potassium sulphate used in small amounts.

Are under extruded standard parts within the meaning of the invention E.g. prefabricated parts, such as plates, pipes, road and path components, window frames, window sills, beams, surrounds of swimming pools, understood fire-resistant moldings, spacers, l'rägerdecks and profiles of various kinds.

An important advantage of the moldings according to the invention is one particularly good early strength, which, for example in the case of anhydrite-bonded moldings, significantly shortens the hardening time, makes post-treatment in an autoclave superfluous in the case of cement-bonded moldings. .

Another advantage is the good compressibility of the described -Mixtures, which among other things have a low power consumption has the consequence.

BAD ORfG / NAL

109809/0932

Example 1 .

24 parts by weight. Sand (grain size max. 5 mm) ,. 2.4 parts by weight Rock flour and 8 parts by weight. Portland cement 275 are-in a compulsory mixer premixed dry, then put water and below specified additives and continue mixing (see Table 1).

The mortar is extruded through a 4x4 cm nozzle. Two Days after production, the pressed strands are cut and the flexural tensile strength and compressive strength are determined. the The results are shown in Table 1.,

Table 1

example
No. Additive amount
Type Weight TIe. water
Wt.TIe. Flexural tension pressure
strength
after 2 days ₂
kp / cm kp / cm 349
434 1a
_Tb__ _J £ e4jnent L 10 0.4 3.4
2.55 80
92 381
373
442 1c
1d-
1e Melment L 300 0.4
98 i » Melment
L 10 1)
+ 2 % surfactant2) 0.4
$ 50 melment
L 300 1)
+ 49 i ° Melment
I 10 1)
+ 1 io surfactant2) 0.4 2.8
2.53
2.5 87
87
84

1 ) Melment ^ L 10 and L 300 are 20 ^ solutions of an amino-s-triazine resin containing acid groups.

2) Na salae of alkyl aryl sulfonic acids. . ".. ·

194 051C

Example 2

Dry in a compulsory mixer 24 parts by weight. Sand (grain size max. 5 mm), 2.4 parts by weight. Rock flour and 8.4 parts by weight. Anhydrite binder (premixed from 8 parts by weight of anhydrite AB 200 (DIN 4208), 0.32 part by weight. Portland cement 275, 0.08 parts by weight. Potassium sulfate) mixed, water and additives (see table 2) are then added and mixed until results in a homogeneous mortar. The anhydrite mortar is extruded through a 4x4 cm nozzle. ■ ·

Four days after manufacture, the pressed strands are cut. Flexural tensile strength and compressive strength are determined. The results are shown in Table 2.

Table 2

Example additive Amount of water No. Type Part by weight. Wt.TIe.

Flexural compressive strength

na kp / cm

after 4 days' « ² kg / a

2a
2 B
2c

M elment L1O ^IJ

98 % melment
I 10 1) "χ
+ 2 # surfactant '

0.4

0.4

3.55 2.42

2.37

30 57

42.5

110 310

258

1 ), 2 ) = see footnote in Table 1

10Ö803 / ÖÖ32

Example 3

The following mixture was produced in a compulsory mixer:

58 parts by weight. Portland cement 375

12 " ^M asbestos mixture of types 5, 6, 7 according to Quebec standard test" · -

20 "" water
1 "" additive A or B

Additive A consists of 99.9 tin by weight. Melment ® L 10 ¹ ^ and

0.1 '"" surfactant x)

Additive B consists of 49.95 tin by weight. Melment ^ L 10 '.

50.0 "" Melment ^ L 300 1) and 0.05 "" · surfactant 2)

1), 2) = see footnote to table 1.

After vigorous mixing, the mixture was through a 1.7 χ 1.7 cm nozzle extruded «The results are shown in Table 3. ^ * ^^ = -

Table 3 '

Example · Strengths in, kp / cm ²

No additives after 1 day after 3 days

Bending tensile compressive bending tensile compressive strength strength strength strength.

3a A. 52 165 83 289 3b B. 64 220 89 291

Similar good results can also be achieved with finely ground quartz sand.

Without additives A or B, the specified mixture cannot be extruded. . .

194051G

Example 4

In a compulsory mixer, 24 parts by weight. Sand (grain size max. 5 mm), 2.4 parts by weight. Rock flour and 8.4 parts by weight. Anhydrite binder (consisting of 8 parts by weight of anhydrite AB 200 (DIlT 4208), 0.32 tin by weight. Calcium hydroxide and 0.08 parts by weight. "Potassium sulfate) dry mixed; 2.42 parts by weight. Water and 0.4 parts by weight of melment

1 ) L 10 'are then added. Mixing is continued until a homogeneous mortar is obtained * This anhydrite mortar is extruded through a 4x4 cm nozzle. The results are shown in Table 4.

Table 4

Strengths after 4 days

Flexural strength compressive strength kp / cm ^. kp / cm ²

Without Melmeniss * I 10 ¹ ^ _ 28 102

With 0.4 wt. Melment ^

L 10 1) —v. ' 50 285

1) = see footnote to table 1 _v

Claims (7)

Claims ^r 1 J 'Extruded molded body based on inorganic binders and fillers, characterized by a content of at least one aminoplast resin containing acid groups based on an amino-s-triazine with at least two NHp groups as an additive, as well as optionally other additives. 2. Extruded molded body according to claim 1, characterized in that that the aminoplast resin contains sulfonic acid groups. ■ 3. Extruded molded body according to claim 1 or 2, characterized by a content of 0.1 to 5 wt .-%, preferably 0.5 to 1 wt .- ^, of the aminoplast resin calculated as Solid, based on the binder used. 4. Extruded molding according to one of claims 1 to 3t characterized by a content of 0.01 to 1 wt .- $, preferably 0.05 to 0.1 wt .- ^^ an ion-active surfactant, based on the binder used, as another additive. 5. Extruded molded body according to one of claims 1 to 4, characterized in that it has one or more binders from the group consisting of clinker and cements, calcium sulfate, magnesite binders and lime. 6. Extruded molded body according to claim 1 to 5, characterized characterized in that it contains one or more fillers from the group consisting of rock flour, sand, organic and inorganic fiber materials contains. '. 7. Extruded molded body according to one of claims 2 to 6, characterized in that it is a sulfon acid group as the aminoplast resin containing condensation product of an amino-s- - ίο - with at least two EHp groups ^ηη & formaldehyde, which in 20 wt .- ^ iger aqueous solution has a viscosity between 3 and 500 cP. 109809/0932